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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2017 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qplatformdefs.h"
#include "qstring.h"
#include "qvector.h"
#include "qlist.h"
#include "qdir.h"
#include "qdatetime.h"
#include "qoperatingsystemversion.h"
#include "qoperatingsystemversion_p.h"
#if defined(Q_OS_WIN) || defined(Q_OS_CYGWIN) || defined(Q_OS_WINRT)
# include "qoperatingsystemversion_win_p.h"
# ifndef Q_OS_WINRT
# include "private/qwinregistry_p.h"
# endif
#endif // Q_OS_WIN || Q_OS_CYGWIN
#include <private/qlocale_tools_p.h>
#include <qmutex.h>
#include <QtCore/private/qlocking_p.h>
#include <stdlib.h>
#include <limits.h>
#include <stdarg.h>
#include <string.h>
#ifndef QT_NO_EXCEPTIONS
# include <string>
# include <exception>
#endif
#include <errno.h>
#if defined(Q_CC_MSVC)
# include <crtdbg.h>
#endif
#ifdef Q_OS_WINRT
#include <Ws2tcpip.h>
#endif // Q_OS_WINRT
#ifdef Q_OS_WIN
# include <qt_windows.h>
#endif
#if defined(Q_OS_VXWORKS) && defined(_WRS_KERNEL)
# include <envLib.h>
#endif
#if defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_EMBEDDED)
#include <private/qjni_p.h>
#endif
#if defined(Q_OS_SOLARIS)
# include <sys/systeminfo.h>
#endif
#if defined(Q_OS_DARWIN) && __has_include(<IOKit/IOKitLib.h>)
# include <IOKit/IOKitLib.h>
# include <private/qcore_mac_p.h>
#endif
#ifdef Q_OS_UNIX
#include <sys/utsname.h>
#include <private/qcore_unix_p.h>
#endif
#ifdef Q_OS_BSD4
#include <sys/sysctl.h>
#endif
#if defined(Q_OS_INTEGRITY)
extern "C" {
// Function mmap resides in libshm_client.a. To be able to link with it one needs
// to define symbols 'shm_area_password' and 'shm_area_name', because the library
// is meant to allow the application that links to it to use POSIX shared memory
// without full system POSIX.
# pragma weak shm_area_password
# pragma weak shm_area_name
char shm_area_password[] = "dummy";
char shm_area_name[] = "dummy";
}
#endif
#include "archdetect.cpp"
#ifdef qFatal
// the qFatal in this file are just redirections from elsewhere, so
// don't capture any context again
# undef qFatal
#endif
QT_BEGIN_NAMESPACE
#if !QT_DEPRECATED_SINCE(5, 0)
// Make sure they're defined to be exported
Q_CORE_EXPORT void *qMemCopy(void *dest, const void *src, size_t n);
Q_CORE_EXPORT void *qMemSet(void *dest, int c, size_t n);
#endif
// Statically check assumptions about the environment we're running
// in. The idea here is to error or warn if otherwise implicit Qt
// assumptions are not fulfilled on new hardware or compilers
// (if this list becomes too long, consider factoring into a separate file)
Q_STATIC_ASSERT_X(sizeof(int) == 4, "Qt assumes that int is 32 bits");
Q_STATIC_ASSERT_X(UCHAR_MAX == 255, "Qt assumes that char is 8 bits");
Q_STATIC_ASSERT_X(QT_POINTER_SIZE == sizeof(void *), "QT_POINTER_SIZE defined incorrectly");
Q_STATIC_ASSERT_X(sizeof(float) == 4, "Qt assumes that float is 32 bits");
// While we'd like to check for __STDC_IEC_559__, as per ISO/IEC 9899:2011
// Annex F (C11, normative for C++11), there are a few corner cases regarding
// denormals where GHS compiler is relying hardware behavior that is not IEC
// 559 compliant. So split the check in several subchecks.
// On GHC the compiler reports std::numeric_limits<float>::is_iec559 as false.
// This is all right according to our needs.
#if !defined(Q_CC_GHS)
Q_STATIC_ASSERT_X(std::numeric_limits<float>::is_iec559,
"Qt assumes IEEE 754 floating point");
#endif
// Technically, presence of NaN and infinities are implied from the above check,
// but double checking our environment doesn't hurt...
Q_STATIC_ASSERT_X(std::numeric_limits<float>::has_infinity &&
std::numeric_limits<float>::has_quiet_NaN &&
std::numeric_limits<float>::has_signaling_NaN,
"Qt assumes IEEE 754 floating point");
// is_iec559 checks for ISO/IEC/IEEE 60559:2011 (aka IEEE 754-2008) compliance,
// but that allows for a non-binary radix. We need to recheck that.
// Note how __STDC_IEC_559__ would instead check for IEC 60559:1989, aka
// ANSI/IEEE 754−1985, which specifically implies binary floating point numbers.
Q_STATIC_ASSERT_X(std::numeric_limits<float>::radix == 2,
"Qt assumes binary IEEE 754 floating point");
// not required by the definition of size_t, but we depend on this
Q_STATIC_ASSERT_X(sizeof(size_t) == sizeof(void *), "size_t and a pointer don't have the same size");
Q_STATIC_ASSERT(sizeof(size_t) == sizeof(qsizetype)); // implied by the definition
Q_STATIC_ASSERT((std::is_same<qsizetype, qptrdiff>::value));
/*!
\class QFlag
\inmodule QtCore
\brief The QFlag class is a helper data type for QFlags.
It is equivalent to a plain \c int, except with respect to
function overloading and type conversions. You should never need
to use this class in your applications.
\sa QFlags
*/
/*!
\fn QFlag::QFlag(int value)
Constructs a QFlag object that stores the \a value.
*/
/*!
\fn QFlag::QFlag(uint value)
\since 5.3
Constructs a QFlag object that stores the \a value.
*/
/*!
\fn QFlag::QFlag(short value)
\since 5.3
Constructs a QFlag object that stores the \a value.
*/
/*!
\fn QFlag::QFlag(ushort value)
\since 5.3
Constructs a QFlag object that stores the \a value.
*/
/*!
\fn QFlag::operator int() const
Returns the value stored by the QFlag object.
*/
/*!
\fn QFlag::operator uint() const
\since 5.3
Returns the value stored by the QFlag object.
*/
/*!
\class QFlags
\inmodule QtCore
\brief The QFlags class provides a type-safe way of storing
OR-combinations of enum values.
\ingroup tools
The QFlags<Enum> class is a template class, where Enum is an enum
type. QFlags is used throughout Qt for storing combinations of
enum values.
The traditional C++ approach for storing OR-combinations of enum
values is to use an \c int or \c uint variable. The inconvenience
with this approach is that there's no type checking at all; any
enum value can be OR'd with any other enum value and passed on to
a function that takes an \c int or \c uint.
Qt uses QFlags to provide type safety. For example, the
Qt::Alignment type is simply a typedef for
QFlags<Qt::AlignmentFlag>. QLabel::setAlignment() takes a
Qt::Alignment parameter, which means that any combination of
Qt::AlignmentFlag values, or 0, is legal:
\snippet code/src_corelib_global_qglobal.cpp 0
If you try to pass a value from another enum or just a plain
integer other than 0, the compiler will report an error. If you
need to cast integer values to flags in a untyped fashion, you can
use the explicit QFlags constructor as cast operator.
If you want to use QFlags for your own enum types, use
the Q_DECLARE_FLAGS() and Q_DECLARE_OPERATORS_FOR_FLAGS().
Example:
\snippet code/src_corelib_global_qglobal.cpp 1
You can then use the \c MyClass::Options type to store
combinations of \c MyClass::Option values.
\section1 Flags and the Meta-Object System
The Q_DECLARE_FLAGS() macro does not expose the flags to the meta-object
system, so they cannot be used by Qt Script or edited in Qt Designer.
To make the flags available for these purposes, the Q_FLAG() macro must
be used:
\snippet code/src_corelib_global_qglobal.cpp meta-object flags
\section1 Naming Convention
A sensible naming convention for enum types and associated QFlags
types is to give a singular name to the enum type (e.g., \c
Option) and a plural name to the QFlags type (e.g., \c Options).
When a singular name is desired for the QFlags type (e.g., \c
Alignment), you can use \c Flag as the suffix for the enum type
(e.g., \c AlignmentFlag).
\sa QFlag
*/
/*!
\typedef QFlags::Int
\since 5.0
Typedef for the integer type used for storage as well as for
implicit conversion. Either \c int or \c{unsigned int}, depending
on whether the enum's underlying type is signed or unsigned.
*/
/*!
\typedef QFlags::enum_type
Typedef for the Enum template type.
*/
/*!
\fn template<typename Enum> QFlags<Enum>::QFlags(const QFlags &other)
Constructs a copy of \a other.
*/
/*!
\fn template <typename Enum> QFlags<Enum>::QFlags(Enum flags)
Constructs a QFlags object storing the \a flags.
*/
/*!
\fn template <typename Enum> QFlags<Enum>::QFlags(Zero)
Constructs a QFlags object with no flags set. The parameter must be a
literal 0 value.
*/
/*!
\fn template <typename Enum> QFlags<Enum>::QFlags(QFlag flag)
Constructs a QFlags object initialized with the integer \a flag.
The QFlag type is a helper type. By using it here instead of \c
int, we effectively ensure that arbitrary enum values cannot be
cast to a QFlags, whereas untyped enum values (i.e., \c int
values) can.
*/
/*!
\fn template <typename Enum> QFlags<Enum>::QFlags(std::initializer_list<Enum> flags)
\since 5.4
Constructs a QFlags object initialized with all \a flags
combined using the bitwise OR operator.
\sa operator|=(), operator|()
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator=(const QFlags &other)
Assigns \a other to this object and returns a reference to this
object.
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator&=(int mask)
Performs a bitwise AND operation with \a mask and stores the
result in this QFlags object. Returns a reference to this object.
\sa operator&(), operator|=(), operator^=()
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator&=(uint mask)
\overload
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator&=(Enum mask)
\overload
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator|=(QFlags other)
Performs a bitwise OR operation with \a other and stores the
result in this QFlags object. Returns a reference to this object.
\sa operator|(), operator&=(), operator^=()
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator|=(Enum other)
\overload
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator^=(QFlags other)
Performs a bitwise XOR operation with \a other and stores the
result in this QFlags object. Returns a reference to this object.
\sa operator^(), operator&=(), operator|=()
*/
/*!
\fn template <typename Enum> QFlags &QFlags<Enum>::operator^=(Enum other)
\overload
*/
/*!
\fn template <typename Enum> QFlags<Enum>::operator Int() const
Returns the value stored in the QFlags object as an integer.
\sa Int
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator|(QFlags other) const
Returns a QFlags object containing the result of the bitwise OR
operation on this object and \a other.
\sa operator|=(), operator^(), operator&(), operator~()
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator|(Enum other) const
\overload
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator^(QFlags other) const
Returns a QFlags object containing the result of the bitwise XOR
operation on this object and \a other.
\sa operator^=(), operator&(), operator|(), operator~()
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator^(Enum other) const
\overload
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator&(int mask) const
Returns a QFlags object containing the result of the bitwise AND
operation on this object and \a mask.
\sa operator&=(), operator|(), operator^(), operator~()
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator&(uint mask) const
\overload
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator&(Enum mask) const
\overload
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::operator~() const
Returns a QFlags object that contains the bitwise negation of
this object.
\sa operator&(), operator|(), operator^()
*/
/*!
\fn template <typename Enum> bool QFlags<Enum>::operator!() const
Returns \c true if no flag is set (i.e., if the value stored by the
QFlags object is 0); otherwise returns \c false.
*/
/*!
\fn template <typename Enum> bool QFlags<Enum>::testFlag(Enum flag) const
\since 4.2
Returns \c true if the flag \a flag is set, otherwise \c false.
*/
/*!
\fn template <typename Enum> QFlags QFlags<Enum>::setFlag(Enum flag, bool on)
\since 5.7
Sets the flag \a flag if \a on is \c true or unsets it if
\a on is \c false. Returns a reference to this object.
*/
/*!
\macro Q_DISABLE_COPY(Class)
\relates QObject
Disables the use of copy constructors and assignment operators
for the given \a Class.
Instances of subclasses of QObject should not be thought of as
values that can be copied or assigned, but as unique identities.
This means that when you create your own subclass of QObject
(director or indirect), you should \e not give it a copy constructor
or an assignment operator. However, it may not enough to simply
omit them from your class, because, if you mistakenly write some code
that requires a copy constructor or an assignment operator (it's easy
to do), your compiler will thoughtfully create it for you. You must
do more.
The curious user will have seen that the Qt classes derived
from QObject typically include this macro in a private section:
\snippet code/src_corelib_global_qglobal.cpp 43
It declares a copy constructor and an assignment operator in the
private section, so that if you use them by mistake, the compiler
will report an error.
\snippet code/src_corelib_global_qglobal.cpp 44
But even this might not catch absolutely every case. You might be
tempted to do something like this:
\snippet code/src_corelib_global_qglobal.cpp 45
First of all, don't do that. Most compilers will generate code that
uses the copy constructor, so the privacy violation error will be
reported, but your C++ compiler is not required to generate code for
this statement in a specific way. It could generate code using
\e{neither} the copy constructor \e{nor} the assignment operator we
made private. In that case, no error would be reported, but your
application would probably crash when you called a member function
of \c{w}.
\sa Q_DISABLE_COPY_MOVE, Q_DISABLE_MOVE
*/
/*!
\macro Q_DISABLE_MOVE(Class)
\relates QObject
Disables the use of move constructors and move assignment operators
for the given \a Class.
\sa Q_DISABLE_COPY, Q_DISABLE_COPY_MOVE
\since 5.13
*/
/*!
\macro Q_DISABLE_COPY_MOVE(Class)
\relates QObject
A convenience macro that disables the use of copy constructors, assignment
operators, move constructors and move assignment operators for the given
\a Class, combining Q_DISABLE_COPY and Q_DISABLE_MOVE.
\sa Q_DISABLE_COPY, Q_DISABLE_MOVE
\since 5.13
*/
/*!
\macro Q_DECLARE_FLAGS(Flags, Enum)
\relates QFlags
The Q_DECLARE_FLAGS() macro expands to
\snippet code/src_corelib_global_qglobal.cpp 2
\a Enum is the name of an existing enum type, whereas \a Flags is
the name of the QFlags<\e{Enum}> typedef.
See the QFlags documentation for details.
\sa Q_DECLARE_OPERATORS_FOR_FLAGS()
*/
/*!
\macro Q_DECLARE_OPERATORS_FOR_FLAGS(Flags)
\relates QFlags
The Q_DECLARE_OPERATORS_FOR_FLAGS() macro declares global \c
operator|() functions for \a Flags, which is of type QFlags<T>.
See the QFlags documentation for details.
\sa Q_DECLARE_FLAGS()
*/
/*!
\headerfile <QtGlobal>
\title Global Qt Declarations
\ingroup funclists
\brief The <QtGlobal> header file includes the fundamental global
declarations. It is included by most other Qt header files.
The global declarations include \l{types}, \l{functions} and
\l{macros}.
The type definitions are partly convenience definitions for basic
types (some of which guarantee certain bit-sizes on all platforms
supported by Qt), partly types related to Qt message handling. The
functions are related to generating messages, Qt version handling
and comparing and adjusting object values. And finally, some of
the declared macros enable programmers to add compiler or platform
specific code to their applications, while others are convenience
macros for larger operations.
\section1 Types
The header file declares several type definitions that guarantee a
specified bit-size on all platforms supported by Qt for various
basic types, for example \l qint8 which is a signed char
guaranteed to be 8-bit on all platforms supported by Qt. The
header file also declares the \l qlonglong type definition for \c
{long long int } (\c __int64 on Windows).
Several convenience type definitions are declared: \l qreal for \c
double or \c float, \l uchar for \c unsigned char, \l uint for \c unsigned
int, \l ulong for \c unsigned long and \l ushort for \c unsigned
short.
Finally, the QtMsgType definition identifies the various messages
that can be generated and sent to a Qt message handler;
QtMessageHandler is a type definition for a pointer to a function with
the signature
\c {void myMessageHandler(QtMsgType, const QMessageLogContext &, const char *)}.
QMessageLogContext class contains the line, file, and function the
message was logged at. This information is created by the QMessageLogger
class.
\section1 Functions
The <QtGlobal> header file contains several functions comparing
and adjusting an object's value. These functions take a template
type as argument: You can retrieve the absolute value of an object
using the qAbs() function, and you can bound a given object's
value by given minimum and maximum values using the qBound()
function. You can retrieve the minimum and maximum of two given
objects using qMin() and qMax() respectively. All these functions
return a corresponding template type; the template types can be
replaced by any other type.
Example:
\snippet code/src_corelib_global_qglobal.cpp 3
<QtGlobal> also contains functions that generate messages from the
given string argument: qDebug(), qInfo(), qWarning(), qCritical(),
and qFatal(). These functions call the message handler
with the given message.
Example:
\snippet code/src_corelib_global_qglobal.cpp 4
The remaining functions are qRound() and qRound64(), which both
accept a \c double or \c float value as their argument returning
the value rounded up to the nearest integer and 64-bit integer
respectively, the qInstallMessageHandler() function which installs
the given QtMessageHandler, and the qVersion() function which
returns the version number of Qt at run-time as a string.
\section1 Macros
The <QtGlobal> header file provides a range of macros (Q_CC_*)
that are defined if the application is compiled using the
specified platforms. For example, the Q_CC_SUN macro is defined if
the application is compiled using Forte Developer, or Sun Studio
C++. The header file also declares a range of macros (Q_OS_*)
that are defined for the specified platforms. For example,
Q_OS_UNIX which is defined for the Unix-based systems.
The purpose of these macros is to enable programmers to add
compiler or platform specific code to their application.
The remaining macros are convenience macros for larger operations:
The QT_TR_NOOP(), QT_TRANSLATE_NOOP(), and QT_TRANSLATE_NOOP3()
macros provide the possibility of marking strings for delayed
translation. QT_TR_N_NOOP(), QT_TRANSLATE_N_NOOP(), and
QT_TRANSLATE_N_NOOP3() are numerator dependent variants of these.
The Q_ASSERT() and Q_ASSERT_X() enables warning messages of various
level of refinement. The Q_FOREACH() and foreach() macros
implement Qt's foreach loop.
The Q_INT64_C() and Q_UINT64_C() macros wrap signed and unsigned
64-bit integer literals in a platform-independent way. The
Q_CHECK_PTR() macro prints a warning containing the source code's
file name and line number, saying that the program ran out of
memory, if the pointer is 0. The qPrintable() and qUtf8Printable()
macros represent an easy way of printing text.
The QT_POINTER_SIZE macro expands to the size of a pointer in bytes.
The macros QT_VERSION and QT_VERSION_STR expand to a numeric value
or a string, respectively, that specifies the version of Qt that the
application is compiled against.
\sa <QtAlgorithms>, QSysInfo
*/
/*!
\typedef qreal
\relates <QtGlobal>
Typedef for \c double unless Qt is configured with the
\c{-qreal float} option.
*/
/*! \typedef uchar
\relates <QtGlobal>
Convenience typedef for \c{unsigned char}.
*/
/*! \typedef ushort
\relates <QtGlobal>
Convenience typedef for \c{unsigned short}.
*/
/*! \typedef uint
\relates <QtGlobal>
Convenience typedef for \c{unsigned int}.
*/
/*! \typedef ulong
\relates <QtGlobal>
Convenience typedef for \c{unsigned long}.
*/
/*! \typedef qint8
\relates <QtGlobal>
Typedef for \c{signed char}. This type is guaranteed to be 8-bit
on all platforms supported by Qt.
*/
/*!
\typedef quint8
\relates <QtGlobal>
Typedef for \c{unsigned char}. This type is guaranteed to
be 8-bit on all platforms supported by Qt.
*/
/*! \typedef qint16
\relates <QtGlobal>
Typedef for \c{signed short}. This type is guaranteed to be
16-bit on all platforms supported by Qt.
*/
/*!
\typedef quint16
\relates <QtGlobal>
Typedef for \c{unsigned short}. This type is guaranteed to
be 16-bit on all platforms supported by Qt.
*/
/*! \typedef qint32
\relates <QtGlobal>
Typedef for \c{signed int}. This type is guaranteed to be 32-bit
on all platforms supported by Qt.
*/
/*!
\typedef quint32
\relates <QtGlobal>
Typedef for \c{unsigned int}. This type is guaranteed to
be 32-bit on all platforms supported by Qt.
*/
/*! \typedef qint64
\relates <QtGlobal>
Typedef for \c{long long int} (\c __int64 on Windows). This type
is guaranteed to be 64-bit on all platforms supported by Qt.
Literals of this type can be created using the Q_INT64_C() macro:
\snippet code/src_corelib_global_qglobal.cpp 5
\sa Q_INT64_C(), quint64, qlonglong
*/
/*!
\typedef quint64
\relates <QtGlobal>
Typedef for \c{unsigned long long int} (\c{unsigned __int64} on
Windows). This type is guaranteed to be 64-bit on all platforms
supported by Qt.
Literals of this type can be created using the Q_UINT64_C()
macro:
\snippet code/src_corelib_global_qglobal.cpp 6
\sa Q_UINT64_C(), qint64, qulonglong
*/
/*!
\typedef qintptr
\relates <QtGlobal>
Integral type for representing pointers in a signed integer (useful for
hashing, etc.).
Typedef for either qint32 or qint64. This type is guaranteed to
be the same size as a pointer on all platforms supported by Qt. On
a system with 32-bit pointers, qintptr is a typedef for qint32;
on a system with 64-bit pointers, qintptr is a typedef for
qint64.
Note that qintptr is signed. Use quintptr for unsigned values.
\sa qptrdiff, qint32, qint64
*/
/*!
\typedef quintptr
\relates <QtGlobal>
Integral type for representing pointers in an unsigned integer (useful for
hashing, etc.).
Typedef for either quint32 or quint64. This type is guaranteed to
be the same size as a pointer on all platforms supported by Qt. On
a system with 32-bit pointers, quintptr is a typedef for quint32;
on a system with 64-bit pointers, quintptr is a typedef for
quint64.
Note that quintptr is unsigned. Use qptrdiff for signed values.
\sa qptrdiff, quint32, quint64
*/
/*!
\typedef qptrdiff
\relates <QtGlobal>
Integral type for representing pointer differences.
Typedef for either qint32 or qint64. This type is guaranteed to be
the same size as a pointer on all platforms supported by Qt. On a
system with 32-bit pointers, quintptr is a typedef for quint32; on
a system with 64-bit pointers, quintptr is a typedef for quint64.
Note that qptrdiff is signed. Use quintptr for unsigned values.
\sa quintptr, qint32, qint64
*/
/*!
\typedef qsizetype
\relates <QtGlobal>
\since 5.10
Integral type providing Posix' \c ssize_t for all platforms.
This type is guaranteed to be the same size as a \c size_t on all
platforms supported by Qt.
Note that qsizetype is signed. Use \c size_t for unsigned values.
\sa qptrdiff
*/
/*!
\enum QtMsgType
\relates <QtGlobal>
This enum describes the messages that can be sent to a message
handler (QtMessageHandler). You can use the enum to identify and
associate the various message types with the appropriate
actions.
\value QtDebugMsg
A message generated by the qDebug() function.
\value QtInfoMsg
A message generated by the qInfo() function.
\value QtWarningMsg
A message generated by the qWarning() function.
\value QtCriticalMsg
A message generated by the qCritical() function.
\value QtFatalMsg
A message generated by the qFatal() function.
\value QtSystemMsg
\c QtInfoMsg was added in Qt 5.5.
\sa QtMessageHandler, qInstallMessageHandler()
*/
/*! \typedef QFunctionPointer
\relates <QtGlobal>
This is a typedef for \c{void (*)()}, a pointer to a function that takes
no arguments and returns void.
*/
/*! \macro qint64 Q_INT64_C(literal)
\relates <QtGlobal>
Wraps the signed 64-bit integer \a literal in a
platform-independent way.
Example:
\snippet code/src_corelib_global_qglobal.cpp 8
\sa qint64, Q_UINT64_C()
*/
/*! \macro quint64 Q_UINT64_C(literal)
\relates <QtGlobal>
Wraps the unsigned 64-bit integer \a literal in a
platform-independent way.
Example:
\snippet code/src_corelib_global_qglobal.cpp 9
\sa quint64, Q_INT64_C()
*/
/*! \typedef qlonglong
\relates <QtGlobal>
Typedef for \c{long long int} (\c __int64 on Windows). This is
the same as \l qint64.
\sa qulonglong, qint64
*/
/*!
\typedef qulonglong
\relates <QtGlobal>
Typedef for \c{unsigned long long int} (\c{unsigned __int64} on
Windows). This is the same as \l quint64.
\sa quint64, qlonglong
*/
/*! \fn template <typename T> T qAbs(const T &t)
\relates <QtGlobal>
Compares \a t to the 0 of type T and returns the absolute
value. Thus if T is \e {double}, then \a t is compared to
\e{(double) 0}.
Example:
\snippet code/src_corelib_global_qglobal.cpp 10
*/
/*! \fn int qRound(double d)
\relates <QtGlobal>
Rounds \a d to the nearest integer.
Rounds half up (e.g. 0.5 -> 1, -0.5 -> 0).
Example:
\snippet code/src_corelib_global_qglobal.cpp 11A
*/
/*! \fn int qRound(float d)
\relates <QtGlobal>
Rounds \a d to the nearest integer.
Rounds half up (e.g. 0.5f -> 1, -0.5f -> 0).
Example:
\snippet code/src_corelib_global_qglobal.cpp 11B
*/
/*! \fn qint64 qRound64(double d)
\relates <QtGlobal>
Rounds \a d to the nearest 64-bit integer.
Rounds half up (e.g. 0.5 -> 1, -0.5 -> 0).
Example:
\snippet code/src_corelib_global_qglobal.cpp 12A
*/
/*! \fn qint64 qRound64(float d)
\relates <QtGlobal>
Rounds \a d to the nearest 64-bit integer.
Rounds half up (e.g. 0.5f -> 1, -0.5f -> 0).
Example:
\snippet code/src_corelib_global_qglobal.cpp 12B
*/
/*! \fn template <typename T> const T &qMin(const T &a, const T &b)
\relates <QtGlobal>
Returns the minimum of \a a and \a b.
Example:
\snippet code/src_corelib_global_qglobal.cpp 13
\sa qMax(), qBound()
*/
/*! \fn template <typename T> const T &qMax(const T &a, const T &b)
\relates <QtGlobal>
Returns the maximum of \a a and \a b.
Example:
\snippet code/src_corelib_global_qglobal.cpp 14
\sa qMin(), qBound()
*/
/*! \fn template <typename T> const T &qBound(const T &min, const T &val, const T &max)
\relates <QtGlobal>
Returns \a val bounded by \a min and \a max. This is equivalent
to qMax(\a min, qMin(\a val, \a max)).
Example:
\snippet code/src_corelib_global_qglobal.cpp 15
\sa qMin(), qMax()
*/
/*! \fn template <typename T> auto qOverload(T functionPointer)
\relates <QtGlobal>
\since 5.7
Returns a pointer to an overloaded function. The template
parameter is the list of the argument types of the function.
\a functionPointer is the pointer to the (member) function:
\snippet code/src_corelib_global_qglobal.cpp 52
If a member function is also const-overloaded \l qConstOverload and
\l qNonConstOverload need to be used.
qOverload() requires C++14 enabled. In C++11-only code, the helper
classes QOverload, QConstOverload, and QNonConstOverload can be used directly:
\snippet code/src_corelib_global_qglobal.cpp 53
\note Qt detects the necessary C++14 compiler support by way of the feature
test recommendations from
\l{https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations}
{C++ Committee's Standing Document 6}.
\sa qConstOverload(), qNonConstOverload(), {Differences between String-Based
and Functor-Based Connections}
*/
/*! \fn template <typename T> auto qConstOverload(T memberFunctionPointer)
\relates <QtGlobal>
\since 5.7
Returns the \a memberFunctionPointer pointer to a constant member function:
\snippet code/src_corelib_global_qglobal.cpp 54
\sa qOverload, qNonConstOverload, {Differences between String-Based
and Functor-Based Connections}
*/
/*! \fn template <typename T> auto qNonConstOverload(T memberFunctionPointer)
\relates <QtGlobal>
\since 5.7
Returns the \a memberFunctionPointer pointer to a non-constant member function:
\snippet code/src_corelib_global_qglobal.cpp 54
\sa qOverload, qNonConstOverload, {Differences between String-Based
and Functor-Based Connections}
*/
/*!
\macro QT_VERSION_CHECK
\relates <QtGlobal>
Turns the major, minor and patch numbers of a version into an
integer, 0xMMNNPP (MM = major, NN = minor, PP = patch). This can
be compared with another similarly processed version id.
Example:
\snippet code/src_corelib_global_qglobal.cpp qt-version-check
\sa QT_VERSION
*/
/*!
\macro QT_VERSION
\relates <QtGlobal>
This macro expands a numeric value of the form 0xMMNNPP (MM =
major, NN = minor, PP = patch) that specifies Qt's version
number. For example, if you compile your application against Qt
4.1.2, the QT_VERSION macro will expand to 0x040102.
You can use QT_VERSION to use the latest Qt features where
available.
Example:
\snippet code/src_corelib_global_qglobal.cpp 16
\sa QT_VERSION_STR, qVersion()
*/
/*!
\macro QT_VERSION_STR
\relates <QtGlobal>
This macro expands to a string that specifies Qt's version number
(for example, "4.1.2"). This is the version against which the
application is compiled.
\sa qVersion(), QT_VERSION
*/
/*!
\relates <QtGlobal>
Returns the version number of Qt at run-time as a string (for
example, "4.1.2"). This may be a different version than the
version the application was compiled against.
\sa QT_VERSION_STR, QLibraryInfo::version()
*/
const char *qVersion() noexcept
{
return QT_VERSION_STR;
}
bool qSharedBuild() noexcept
{
#ifdef QT_SHARED
return true;
#else
return false;
#endif
}
/*****************************************************************************
System detection routines
*****************************************************************************/
/*!
\class QSysInfo
\inmodule QtCore
\brief The QSysInfo class provides information about the system.
\list
\li \l WordSize specifies the size of a pointer for the platform
on which the application is compiled.
\li \l ByteOrder specifies whether the platform is big-endian or
little-endian.
\endlist
Some constants are defined only on certain platforms. You can use
the preprocessor symbols Q_OS_WIN and Q_OS_MACOS to test that
the application is compiled under Windows or \macos.
\sa QLibraryInfo
*/
/*!
\enum QSysInfo::Sizes
This enum provides platform-specific information about the sizes of data
structures used by the underlying architecture.
\value WordSize The size in bits of a pointer for the platform on which
the application is compiled (32 or 64).
*/
/*!
\deprecated
\variable QSysInfo::WindowsVersion
\brief the version of the Windows operating system on which the
application is run.
*/
/*!
\deprecated
\fn QSysInfo::WindowsVersion QSysInfo::windowsVersion()
\since 4.4
Returns the version of the Windows operating system on which the
application is run, or WV_None if the operating system is not
Windows.
*/
/*!
\deprecated
\variable QSysInfo::MacintoshVersion
\brief the version of the Macintosh operating system on which
the application is run.
*/
/*!
\deprecated
\fn QSysInfo::MacVersion QSysInfo::macVersion()
Returns the version of Darwin (\macos or iOS) on which the
application is run, or MV_None if the operating system
is not a version of Darwin.
*/
/*!
\enum QSysInfo::Endian
\value BigEndian Big-endian byte order (also called Network byte order)
\value LittleEndian Little-endian byte order
\value ByteOrder Equals BigEndian or LittleEndian, depending on
the platform's byte order.
*/
/*!
\deprecated
\enum QSysInfo::WinVersion
This enum provides symbolic names for the various versions of the
Windows operating system. On Windows, the
QSysInfo::WindowsVersion variable gives the version of the system
on which the application is run.
MS-DOS-based versions:
\value WV_32s Windows 3.1 with Win 32s
\value WV_95 Windows 95
\value WV_98 Windows 98
\value WV_Me Windows Me
NT-based versions (note that each operating system version is only represented once rather than each Windows edition):
\value WV_NT Windows NT (operating system version 4.0)
\value WV_2000 Windows 2000 (operating system version 5.0)
\value WV_XP Windows XP (operating system version 5.1)
\value WV_2003 Windows Server 2003, Windows Server 2003 R2, Windows Home Server, Windows XP Professional x64 Edition (operating system version 5.2)
\value WV_VISTA Windows Vista, Windows Server 2008 (operating system version 6.0)
\value WV_WINDOWS7 Windows 7, Windows Server 2008 R2 (operating system version 6.1)
\value WV_WINDOWS8 Windows 8 (operating system version 6.2)
\value WV_WINDOWS8_1 Windows 8.1 (operating system version 6.3), introduced in Qt 5.2
\value WV_WINDOWS10 Windows 10 (operating system version 10.0), introduced in Qt 5.5
Alternatively, you may use the following macros which correspond directly to the Windows operating system version number:
\value WV_4_0 Operating system version 4.0, corresponds to Windows NT
\value WV_5_0 Operating system version 5.0, corresponds to Windows 2000
\value WV_5_1 Operating system version 5.1, corresponds to Windows XP
\value WV_5_2 Operating system version 5.2, corresponds to Windows Server 2003, Windows Server 2003 R2, Windows Home Server, and Windows XP Professional x64 Edition
\value WV_6_0 Operating system version 6.0, corresponds to Windows Vista and Windows Server 2008
\value WV_6_1 Operating system version 6.1, corresponds to Windows 7 and Windows Server 2008 R2
\value WV_6_2 Operating system version 6.2, corresponds to Windows 8
\value WV_6_3 Operating system version 6.3, corresponds to Windows 8.1, introduced in Qt 5.2
\value WV_10_0 Operating system version 10.0, corresponds to Windows 10, introduced in Qt 5.5
The following masks can be used for testing whether a Windows
version is MS-DOS-based or NT-based:
\value WV_DOS_based MS-DOS-based version of Windows
\value WV_NT_based NT-based version of Windows
\value WV_None Operating system other than Windows.
\omitvalue WV_CE
\omitvalue WV_CENET
\omitvalue WV_CE_5
\omitvalue WV_CE_6
\omitvalue WV_CE_based
\sa MacVersion
*/
/*!
\deprecated
\enum QSysInfo::MacVersion
This enum provides symbolic names for the various versions of the
Darwin operating system, covering both \macos and iOS. The
QSysInfo::MacintoshVersion variable gives the version of the
system on which the application is run.
\value MV_9 \macos 9
\value MV_10_0 \macos 10.0
\value MV_10_1 \macos 10.1
\value MV_10_2 \macos 10.2
\value MV_10_3 \macos 10.3
\value MV_10_4 \macos 10.4
\value MV_10_5 \macos 10.5
\value MV_10_6 \macos 10.6
\value MV_10_7 \macos 10.7
\value MV_10_8 \macos 10.8
\value MV_10_9 \macos 10.9
\value MV_10_10 \macos 10.10
\value MV_10_11 \macos 10.11
\value MV_10_12 \macos 10.12
\value MV_Unknown An unknown and currently unsupported platform
\value MV_CHEETAH Apple codename for MV_10_0
\value MV_PUMA Apple codename for MV_10_1
\value MV_JAGUAR Apple codename for MV_10_2
\value MV_PANTHER Apple codename for MV_10_3
\value MV_TIGER Apple codename for MV_10_4
\value MV_LEOPARD Apple codename for MV_10_5
\value MV_SNOWLEOPARD Apple codename for MV_10_6
\value MV_LION Apple codename for MV_10_7
\value MV_MOUNTAINLION Apple codename for MV_10_8
\value MV_MAVERICKS Apple codename for MV_10_9
\value MV_YOSEMITE Apple codename for MV_10_10
\value MV_ELCAPITAN Apple codename for MV_10_11
\value MV_SIERRA Apple codename for MV_10_12
\value MV_IOS iOS (any)
\value MV_IOS_4_3 iOS 4.3
\value MV_IOS_5_0 iOS 5.0
\value MV_IOS_5_1 iOS 5.1
\value MV_IOS_6_0 iOS 6.0
\value MV_IOS_6_1 iOS 6.1
\value MV_IOS_7_0 iOS 7.0
\value MV_IOS_7_1 iOS 7.1
\value MV_IOS_8_0 iOS 8.0
\value MV_IOS_8_1 iOS 8.1
\value MV_IOS_8_2 iOS 8.2
\value MV_IOS_8_3 iOS 8.3
\value MV_IOS_8_4 iOS 8.4
\value MV_IOS_9_0 iOS 9.0
\value MV_IOS_9_1 iOS 9.1
\value MV_IOS_9_2 iOS 9.2
\value MV_IOS_9_3 iOS 9.3
\value MV_IOS_10_0 iOS 10.0
\value MV_TVOS tvOS (any)
\value MV_TVOS_9_0 tvOS 9.0
\value MV_TVOS_9_1 tvOS 9.1
\value MV_TVOS_9_2 tvOS 9.2
\value MV_TVOS_10_0 tvOS 10.0
\value MV_WATCHOS watchOS (any)
\value MV_WATCHOS_2_0 watchOS 2.0
\value MV_WATCHOS_2_1 watchOS 2.1
\value MV_WATCHOS_2_2 watchOS 2.2
\value MV_WATCHOS_3_0 watchOS 3.0
\value MV_None Not a Darwin operating system
\sa WinVersion
*/
/*!
\macro Q_OS_DARWIN
\relates <QtGlobal>
Defined on Darwin-based operating systems such as \macos, iOS, watchOS, and tvOS.
*/
/*!
\macro Q_OS_MAC
\relates <QtGlobal>
Deprecated synonym for \c Q_OS_DARWIN. Do not use.
*/
/*!
\macro Q_OS_OSX
\relates <QtGlobal>
Deprecated synonym for \c Q_OS_MACOS. Do not use.
*/
/*!
\macro Q_OS_MACOS
\relates <QtGlobal>
Defined on \macos.
*/
/*!
\macro Q_OS_IOS
\relates <QtGlobal>
Defined on iOS.
*/
/*!
\macro Q_OS_WATCHOS
\relates <QtGlobal>
Defined on watchOS.
*/
/*!
\macro Q_OS_TVOS
\relates <QtGlobal>
Defined on tvOS.
*/
/*!
\macro Q_OS_WIN
\relates <QtGlobal>
Defined on all supported versions of Windows. That is, if
\l Q_OS_WIN32, \l Q_OS_WIN64, or \l Q_OS_WINRT is defined.
*/
/*!
\macro Q_OS_WINDOWS
\relates <QtGlobal>
This is a synonym for Q_OS_WIN.
*/
/*!
\macro Q_OS_WIN32
\relates <QtGlobal>
Defined on 32-bit and 64-bit versions of Windows.
*/
/*!
\macro Q_OS_WIN64
\relates <QtGlobal>
Defined on 64-bit versions of Windows.
*/
/*!
\macro Q_OS_WINRT
\relates <QtGlobal>
Defined for Windows Runtime (Windows Store apps) on Windows 8, Windows RT,
and Windows Phone 8.
*/
/*!
\macro Q_OS_CYGWIN
\relates <QtGlobal>
Defined on Cygwin.
*/
/*!
\macro Q_OS_SOLARIS
\relates <QtGlobal>
Defined on Sun Solaris.
*/
/*!
\macro Q_OS_HPUX
\relates <QtGlobal>
Defined on HP-UX.
*/
/*!
\macro Q_OS_LINUX
\relates <QtGlobal>
Defined on Linux.
*/
/*!
\macro Q_OS_ANDROID
\relates <QtGlobal>
Defined on Android.
*/
/*!
\macro Q_OS_FREEBSD
\relates <QtGlobal>
Defined on FreeBSD.
*/
/*!
\macro Q_OS_NETBSD
\relates <QtGlobal>
Defined on NetBSD.
*/
/*!
\macro Q_OS_OPENBSD
\relates <QtGlobal>
Defined on OpenBSD.
*/
/*!
\macro Q_OS_AIX
\relates <QtGlobal>
Defined on AIX.
*/
/*!
\macro Q_OS_HURD
\relates <QtGlobal>
Defined on GNU Hurd.
*/
/*!
\macro Q_OS_QNX
\relates <QtGlobal>
Defined on QNX Neutrino.
*/
/*!
\macro Q_OS_LYNX
\relates <QtGlobal>
Defined on LynxOS.
*/
/*!
\macro Q_OS_BSD4
\relates <QtGlobal>
Defined on Any BSD 4.4 system.
*/
/*!
\macro Q_OS_UNIX
\relates <QtGlobal>
Defined on Any UNIX BSD/SYSV system.
*/
/*!
\macro Q_OS_WASM
\relates <QtGlobal>
Defined on Web Assembly.
*/
/*!
\macro Q_CC_SYM
\relates <QtGlobal>
Defined if the application is compiled using Digital Mars C/C++
(used to be Symantec C++).
*/
/*!
\macro Q_CC_MSVC
\relates <QtGlobal>
Defined if the application is compiled using Microsoft Visual
C/C++, Intel C++ for Windows.
*/
/*!
\macro Q_CC_CLANG
\relates <QtGlobal>
Defined if the application is compiled using Clang.
*/
/*!
\macro Q_CC_BOR
\relates <QtGlobal>
Defined if the application is compiled using Borland/Turbo C++.
*/
/*!
\macro Q_CC_WAT
\relates <QtGlobal>
Defined if the application is compiled using Watcom C++.
*/
/*!
\macro Q_CC_GNU
\relates <QtGlobal>
Defined if the application is compiled using GNU C++.
*/
/*!
\macro Q_CC_COMEAU
\relates <QtGlobal>
Defined if the application is compiled using Comeau C++.
*/
/*!
\macro Q_CC_EDG
\relates <QtGlobal>
Defined if the application is compiled using Edison Design Group
C++.
*/
/*!
\macro Q_CC_OC
\relates <QtGlobal>
Defined if the application is compiled using CenterLine C++.
*/
/*!
\macro Q_CC_SUN
\relates <QtGlobal>
Defined if the application is compiled using Forte Developer, or
Sun Studio C++.
*/
/*!
\macro Q_CC_MIPS
\relates <QtGlobal>
Defined if the application is compiled using MIPSpro C++.
*/
/*!
\macro Q_CC_DEC
\relates <QtGlobal>
Defined if the application is compiled using DEC C++.
*/
/*!
\macro Q_CC_HPACC
\relates <QtGlobal>
Defined if the application is compiled using HP aC++.
*/
/*!
\macro Q_CC_USLC
\relates <QtGlobal>
Defined if the application is compiled using SCO OUDK and UDK.
*/
/*!
\macro Q_CC_CDS
\relates <QtGlobal>
Defined if the application is compiled using Reliant C++.
*/
/*!
\macro Q_CC_KAI
\relates <QtGlobal>
Defined if the application is compiled using KAI C++.
*/
/*!
\macro Q_CC_INTEL
\relates <QtGlobal>
Defined if the application is compiled using Intel C++ for Linux,
Intel C++ for Windows.
*/
/*!
\macro Q_CC_HIGHC
\relates <QtGlobal>
Defined if the application is compiled using MetaWare High C/C++.
*/
/*!
\macro Q_CC_PGI
\relates <QtGlobal>
Defined if the application is compiled using Portland Group C++.
*/
/*!
\macro Q_CC_GHS
\relates <QtGlobal>
Defined if the application is compiled using Green Hills
Optimizing C++ Compilers.
*/
/*!
\macro Q_PROCESSOR_ALPHA
\relates <QtGlobal>
Defined if the application is compiled for Alpha processors.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_ARM
\relates <QtGlobal>
Defined if the application is compiled for ARM processors. Qt currently
supports three optional ARM revisions: \l Q_PROCESSOR_ARM_V5, \l
Q_PROCESSOR_ARM_V6, and \l Q_PROCESSOR_ARM_V7.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_ARM_V5
\relates <QtGlobal>
Defined if the application is compiled for ARMv5 processors. The \l
Q_PROCESSOR_ARM macro is also defined when Q_PROCESSOR_ARM_V5 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_ARM_V6
\relates <QtGlobal>
Defined if the application is compiled for ARMv6 processors. The \l
Q_PROCESSOR_ARM and \l Q_PROCESSOR_ARM_V5 macros are also defined when
Q_PROCESSOR_ARM_V6 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_ARM_V7
\relates <QtGlobal>
Defined if the application is compiled for ARMv7 processors. The \l
Q_PROCESSOR_ARM, \l Q_PROCESSOR_ARM_V5, and \l Q_PROCESSOR_ARM_V6 macros
are also defined when Q_PROCESSOR_ARM_V7 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_AVR32
\relates <QtGlobal>
Defined if the application is compiled for AVR32 processors.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_BLACKFIN
\relates <QtGlobal>
Defined if the application is compiled for Blackfin processors.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_IA64
\relates <QtGlobal>
Defined if the application is compiled for IA-64 processors. This includes
all Itanium and Itanium 2 processors.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS
\relates <QtGlobal>
Defined if the application is compiled for MIPS processors. Qt currently
supports seven MIPS revisions: \l Q_PROCESSOR_MIPS_I, \l
Q_PROCESSOR_MIPS_II, \l Q_PROCESSOR_MIPS_III, \l Q_PROCESSOR_MIPS_IV, \l
Q_PROCESSOR_MIPS_V, \l Q_PROCESSOR_MIPS_32, and \l Q_PROCESSOR_MIPS_64.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_I
\relates <QtGlobal>
Defined if the application is compiled for MIPS-I processors. The \l
Q_PROCESSOR_MIPS macro is also defined when Q_PROCESSOR_MIPS_I is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_II
\relates <QtGlobal>
Defined if the application is compiled for MIPS-II processors. The \l
Q_PROCESSOR_MIPS and \l Q_PROCESSOR_MIPS_I macros are also defined when
Q_PROCESSOR_MIPS_II is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_32
\relates <QtGlobal>
Defined if the application is compiled for MIPS32 processors. The \l
Q_PROCESSOR_MIPS, \l Q_PROCESSOR_MIPS_I, and \l Q_PROCESSOR_MIPS_II macros
are also defined when Q_PROCESSOR_MIPS_32 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_III
\relates <QtGlobal>
Defined if the application is compiled for MIPS-III processors. The \l
Q_PROCESSOR_MIPS, \l Q_PROCESSOR_MIPS_I, and \l Q_PROCESSOR_MIPS_II macros
are also defined when Q_PROCESSOR_MIPS_III is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_IV
\relates <QtGlobal>
Defined if the application is compiled for MIPS-IV processors. The \l
Q_PROCESSOR_MIPS, \l Q_PROCESSOR_MIPS_I, \l Q_PROCESSOR_MIPS_II, and \l
Q_PROCESSOR_MIPS_III macros are also defined when Q_PROCESSOR_MIPS_IV is
defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_V
\relates <QtGlobal>
Defined if the application is compiled for MIPS-V processors. The \l
Q_PROCESSOR_MIPS, \l Q_PROCESSOR_MIPS_I, \l Q_PROCESSOR_MIPS_II, \l
Q_PROCESSOR_MIPS_III, and \l Q_PROCESSOR_MIPS_IV macros are also defined
when Q_PROCESSOR_MIPS_V is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_MIPS_64
\relates <QtGlobal>
Defined if the application is compiled for MIPS64 processors. The \l
Q_PROCESSOR_MIPS, \l Q_PROCESSOR_MIPS_I, \l Q_PROCESSOR_MIPS_II, \l
Q_PROCESSOR_MIPS_III, \l Q_PROCESSOR_MIPS_IV, and \l Q_PROCESSOR_MIPS_V
macros are also defined when Q_PROCESSOR_MIPS_64 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_POWER
\relates <QtGlobal>
Defined if the application is compiled for POWER processors. Qt currently
supports two Power variants: \l Q_PROCESSOR_POWER_32 and \l
Q_PROCESSOR_POWER_64.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_POWER_32
\relates <QtGlobal>
Defined if the application is compiled for 32-bit Power processors. The \l
Q_PROCESSOR_POWER macro is also defined when Q_PROCESSOR_POWER_32 is
defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_POWER_64
\relates <QtGlobal>
Defined if the application is compiled for 64-bit Power processors. The \l
Q_PROCESSOR_POWER macro is also defined when Q_PROCESSOR_POWER_64 is
defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_RISCV
\relates <QtGlobal>
\since 5.13
Defined if the application is compiled for RISC-V processors. Qt currently
supports two RISC-V variants: \l Q_PROCESSOR_RISCV_32 and \l
Q_PROCESSOR_RISCV_64.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_RISCV_32
\relates <QtGlobal>
\since 5.13
Defined if the application is compiled for 32-bit RISC-V processors. The \l
Q_PROCESSOR_RISCV macro is also defined when Q_PROCESSOR_RISCV_32 is
defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_RISCV_64
\relates <QtGlobal>
\since 5.13
Defined if the application is compiled for 64-bit RISC-V processors. The \l
Q_PROCESSOR_RISCV macro is also defined when Q_PROCESSOR_RISCV_64 is
defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_S390
\relates <QtGlobal>
Defined if the application is compiled for S/390 processors. Qt supports
one optional variant of S/390: Q_PROCESSOR_S390_X.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_S390_X
\relates <QtGlobal>
Defined if the application is compiled for S/390x processors. The \l
Q_PROCESSOR_S390 macro is also defined when Q_PROCESSOR_S390_X is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_SH
\relates <QtGlobal>
Defined if the application is compiled for SuperH processors. Qt currently
supports one SuperH revision: \l Q_PROCESSOR_SH_4A.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_SH_4A
\relates <QtGlobal>
Defined if the application is compiled for SuperH 4A processors. The \l
Q_PROCESSOR_SH macro is also defined when Q_PROCESSOR_SH_4A is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_SPARC
\relates <QtGlobal>
Defined if the application is compiled for SPARC processors. Qt currently
supports one optional SPARC revision: \l Q_PROCESSOR_SPARC_V9.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_SPARC_V9
\relates <QtGlobal>
Defined if the application is compiled for SPARC V9 processors. The \l
Q_PROCESSOR_SPARC macro is also defined when Q_PROCESSOR_SPARC_V9 is
defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_X86
\relates <QtGlobal>
Defined if the application is compiled for x86 processors. Qt currently
supports two x86 variants: \l Q_PROCESSOR_X86_32 and \l Q_PROCESSOR_X86_64.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_X86_32
\relates <QtGlobal>
Defined if the application is compiled for 32-bit x86 processors. This
includes all i386, i486, i586, and i686 processors. The \l Q_PROCESSOR_X86
macro is also defined when Q_PROCESSOR_X86_32 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro Q_PROCESSOR_X86_64
\relates <QtGlobal>
Defined if the application is compiled for 64-bit x86 processors. This
includes all AMD64, Intel 64, and other x86_64/x64 processors. The \l
Q_PROCESSOR_X86 macro is also defined when Q_PROCESSOR_X86_64 is defined.
\sa QSysInfo::buildCpuArchitecture()
*/
/*!
\macro QT_DISABLE_DEPRECATED_BEFORE
\relates <QtGlobal>
This macro can be defined in the project file to disable functions deprecated in
a specified version of Qt or any earlier version. The default version number is 5.0,
meaning that functions deprecated in or before Qt 5.0 will not be included.
For instance, when using a future release of Qt 5, set
\c{QT_DISABLE_DEPRECATED_BEFORE=0x050100} to disable functions deprecated in
Qt 5.1 and earlier. In any release, set
\c{QT_DISABLE_DEPRECATED_BEFORE=0x000000} to enable all functions, including
the ones deprecated in Qt 5.0.
\sa QT_DEPRECATED_WARNINGS
*/
/*!
\macro QT_DEPRECATED_WARNINGS
\relates <QtGlobal>
Since Qt 5.13, this macro has no effect. In Qt 5.12 and before, if this macro
is defined, the compiler will generate warnings if any API declared as
deprecated by Qt is used.
\sa QT_DISABLE_DEPRECATED_BEFORE, QT_NO_DEPRECATED_WARNINGS
*/
/*!
\macro QT_NO_DEPRECATED_WARNINGS
\relates <QtGlobal>
\since 5.13
This macro can be used to suppress deprecation warnings that would otherwise
be generated when using deprecated APIs.
\sa QT_DISABLE_DEPRECATED_BEFORE
*/
#if defined(QT_BUILD_QMAKE)
// needed to bootstrap qmake
static const unsigned int qt_one = 1;
const int QSysInfo::ByteOrder = ((*((unsigned char *) &qt_one) == 0) ? BigEndian : LittleEndian);
#endif
#if defined(Q_OS_MAC)
QT_BEGIN_INCLUDE_NAMESPACE
#include "private/qcore_mac_p.h"
#include "qnamespace.h"
QT_END_INCLUDE_NAMESPACE
#if QT_DEPRECATED_SINCE(5, 9)
QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
QSysInfo::MacVersion QSysInfo::macVersion()
{
const auto version = QOperatingSystemVersion::current();
#if defined(Q_OS_OSX)
return QSysInfo::MacVersion(Q_MV_OSX(version.majorVersion(), version.minorVersion()));
#elif defined(Q_OS_IOS)
return QSysInfo::MacVersion(Q_MV_IOS(version.majorVersion(), version.minorVersion()));
#elif defined(Q_OS_TVOS)
return QSysInfo::MacVersion(Q_MV_TVOS(version.majorVersion(), version.minorVersion()));
#elif defined(Q_OS_WATCHOS)
return QSysInfo::MacVersion(Q_MV_WATCHOS(version.majorVersion(), version.minorVersion()));
#else
return QSysInfo::MV_Unknown;
#endif
}
const QSysInfo::MacVersion QSysInfo::MacintoshVersion = QSysInfo::macVersion();
QT_WARNING_POP
#endif
#ifdef Q_OS_DARWIN
static const char *osVer_helper(QOperatingSystemVersion version = QOperatingSystemVersion::current())
{
#ifdef Q_OS_MACOS
if (version.majorVersion() == 10) {
switch (version.minorVersion()) {
case 9:
return "Mavericks";
case 10:
return "Yosemite";
case 11:
return "El Capitan";
case 12:
return "Sierra";
case 13:
return "High Sierra";
case 14:
return "Mojave";
}
}
// unknown, future version
#else
Q_UNUSED(version);
#endif
return 0;
}
#endif
#elif defined(Q_OS_WIN) || defined(Q_OS_CYGWIN) || defined(Q_OS_WINRT)
QT_BEGIN_INCLUDE_NAMESPACE
#include "qt_windows.h"
QT_END_INCLUDE_NAMESPACE
# ifndef QT_BOOTSTRAPPED
class QWindowsSockInit
{
public:
QWindowsSockInit();
~QWindowsSockInit();
int version;
};
QWindowsSockInit::QWindowsSockInit()
: version(0)
{
//### should we try for 2.2 on all platforms ??
WSAData wsadata;
// IPv6 requires Winsock v2.0 or better.
if (WSAStartup(MAKEWORD(2,0), &wsadata) != 0) {
qWarning("QTcpSocketAPI: WinSock v2.0 initialization failed.");
} else {
version = 0x20;
}
}
QWindowsSockInit::~QWindowsSockInit()
{
WSACleanup();
}
Q_GLOBAL_STATIC(QWindowsSockInit, winsockInit)
# endif // QT_BOOTSTRAPPED
#if QT_DEPRECATED_SINCE(5, 9)
QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
QSysInfo::WinVersion QSysInfo::windowsVersion()
{
const auto version = QOperatingSystemVersion::current();
if (version.majorVersion() == 6 && version.minorVersion() == 1)
return QSysInfo::WV_WINDOWS7;
if (version.majorVersion() == 6 && version.minorVersion() == 2)
return QSysInfo::WV_WINDOWS8;
if (version.majorVersion() == 6 && version.minorVersion() == 3)
return QSysInfo::WV_WINDOWS8_1;
if (version.majorVersion() == 10 && version.minorVersion() == 0)
return QSysInfo::WV_WINDOWS10;
return QSysInfo::WV_NT_based;
}
const QSysInfo::WinVersion QSysInfo::WindowsVersion = QSysInfo::windowsVersion();
QT_WARNING_POP
#endif
static QString readVersionRegistryString(const wchar_t *subKey)
{
#if !defined(QT_BUILD_QMAKE) && !defined(Q_OS_WINRT)
return QWinRegistryKey(HKEY_LOCAL_MACHINE, LR"(SOFTWARE\Microsoft\Windows NT\CurrentVersion)")
.stringValue(subKey);
#else
Q_UNUSED(subKey);
return QString();
#endif
}
static inline QString windows10ReleaseId()
{
return readVersionRegistryString(L"ReleaseId");
}
static inline QString windows7Build()
{
return readVersionRegistryString(L"CurrentBuild");
}
static QString winSp_helper()
{
const auto osv = qWindowsVersionInfo();
const qint16 major = osv.wServicePackMajor;
if (major) {
QString sp = QStringLiteral("SP ") + QString::number(major);
const qint16 minor = osv.wServicePackMinor;
if (minor)
sp += QLatin1Char('.') + QString::number(minor);
return sp;
}
return QString();
}
static const char *osVer_helper(QOperatingSystemVersion version = QOperatingSystemVersion::current())
{
Q_UNUSED(version);
const OSVERSIONINFOEX osver = qWindowsVersionInfo();
const bool workstation = osver.wProductType == VER_NT_WORKSTATION;
#define Q_WINVER(major, minor) (major << 8 | minor)
switch (Q_WINVER(osver.dwMajorVersion, osver.dwMinorVersion)) {
case Q_WINVER(6, 1):
return workstation ? "7" : "Server 2008 R2";
case Q_WINVER(6, 2):
return workstation ? "8" : "Server 2012";
case Q_WINVER(6, 3):
return workstation ? "8.1" : "Server 2012 R2";
case Q_WINVER(10, 0):
return workstation ? "10" : "Server 2016";
}
#undef Q_WINVER
// unknown, future version
return 0;
}
#endif
#if defined(Q_OS_UNIX)
# if (defined(Q_OS_LINUX) && !defined(Q_OS_ANDROID)) || defined(Q_OS_FREEBSD)
# define USE_ETC_OS_RELEASE
struct QUnixOSVersion
{
// from /etc/os-release older /etc/lsb-release // redhat /etc/redhat-release // debian /etc/debian_version
QString productType; // $ID $DISTRIB_ID // single line file containing: // Debian
QString productVersion; // $VERSION_ID $DISTRIB_RELEASE // <Vendor_ID release Version_ID> // single line file <Release_ID/sid>
QString prettyName; // $PRETTY_NAME $DISTRIB_DESCRIPTION
};
static QString unquote(const char *begin, const char *end)
{
// man os-release says:
// Variable assignment values must be enclosed in double
// or single quotes if they include spaces, semicolons or
// other special characters outside of A–Z, a–z, 0–9. Shell
// special characters ("$", quotes, backslash, backtick)
// must be escaped with backslashes, following shell style.
// All strings should be in UTF-8 format, and non-printable
// characters should not be used. It is not supported to
// concatenate multiple individually quoted strings.
if (*begin == '"') {
Q_ASSERT(end[-1] == '"');
return QString::fromUtf8(begin + 1, end - begin - 2);
}
return QString::fromUtf8(begin, end - begin);
}
static QByteArray getEtcFileContent(const char *filename)
{
// we're avoiding QFile here
int fd = qt_safe_open(filename, O_RDONLY);
if (fd == -1)
return QByteArray();
QT_STATBUF sbuf;
if (QT_FSTAT(fd, &sbuf) == -1) {
qt_safe_close(fd);
return QByteArray();
}
QByteArray buffer(sbuf.st_size, Qt::Uninitialized);
buffer.resize(qt_safe_read(fd, buffer.data(), sbuf.st_size));
qt_safe_close(fd);
return buffer;
}
static bool readEtcFile(QUnixOSVersion &v, const char *filename,
const QByteArray &idKey, const QByteArray &versionKey, const QByteArray &prettyNameKey)
{
QByteArray buffer = getEtcFileContent(filename);
if (buffer.isEmpty())
return false;
const char *ptr = buffer.constData();
const char *end = buffer.constEnd();
const char *eol;
QByteArray line;
for ( ; ptr != end; ptr = eol + 1) {
// find the end of the line after ptr
eol = static_cast<const char *>(memchr(ptr, '\n', end - ptr));
if (!eol)
eol = end - 1;
line.setRawData(ptr, eol - ptr);
if (line.startsWith(idKey)) {
ptr += idKey.length();
v.productType = unquote(ptr, eol);
continue;
}
if (line.startsWith(prettyNameKey)) {
ptr += prettyNameKey.length();
v.prettyName = unquote(ptr, eol);
continue;
}
if (line.startsWith(versionKey)) {
ptr += versionKey.length();
v.productVersion = unquote(ptr, eol);
continue;
}
}
return true;
}
static bool readOsRelease(QUnixOSVersion &v)
{
QByteArray id = QByteArrayLiteral("ID=");
QByteArray versionId = QByteArrayLiteral("VERSION_ID=");
QByteArray prettyName = QByteArrayLiteral("PRETTY_NAME=");
// man os-release(5) says:
// The file /etc/os-release takes precedence over /usr/lib/os-release.
// Applications should check for the former, and exclusively use its data
// if it exists, and only fall back to /usr/lib/os-release if it is
// missing.
return readEtcFile(v, "/etc/os-release", id, versionId, prettyName) ||
readEtcFile(v, "/usr/lib/os-release", id, versionId, prettyName);
}
static bool readEtcLsbRelease(QUnixOSVersion &v)
{
bool ok = readEtcFile(v, "/etc/lsb-release", QByteArrayLiteral("DISTRIB_ID="),
QByteArrayLiteral("DISTRIB_RELEASE="), QByteArrayLiteral("DISTRIB_DESCRIPTION="));
if (ok && (v.prettyName.isEmpty() || v.prettyName == v.productType)) {
// some distributions have redundant information for the pretty name,
// so try /etc/<lowercasename>-release
// we're still avoiding QFile here
QByteArray distrorelease = "/etc/" + v.productType.toLatin1().toLower() + "-release";
int fd = qt_safe_open(distrorelease, O_RDONLY);
if (fd != -1) {
QT_STATBUF sbuf;
if (QT_FSTAT(fd, &sbuf) != -1 && sbuf.st_size > v.prettyName.length()) {
// file apparently contains interesting information
QByteArray buffer(sbuf.st_size, Qt::Uninitialized);
buffer.resize(qt_safe_read(fd, buffer.data(), sbuf.st_size));
v.prettyName = QString::fromLatin1(buffer.trimmed());
}
qt_safe_close(fd);
}
}
// some distributions have a /etc/lsb-release file that does not provide the values
// we are looking for, i.e. DISTRIB_ID, DISTRIB_RELEASE and DISTRIB_DESCRIPTION.
// Assuming that neither DISTRIB_ID nor DISTRIB_RELEASE were found, or contained valid values,
// returning false for readEtcLsbRelease will allow further /etc/<lowercasename>-release parsing.
return ok && !(v.productType.isEmpty() && v.productVersion.isEmpty());
}
#if defined(Q_OS_LINUX)
static QByteArray getEtcFileFirstLine(const char *fileName)
{
QByteArray buffer = getEtcFileContent(fileName);
if (buffer.isEmpty())
return QByteArray();
const char *ptr = buffer.constData();
int eol = buffer.indexOf("\n");
return QByteArray(ptr, eol).trimmed();
}
static bool readEtcRedHatRelease(QUnixOSVersion &v)
{
// /etc/redhat-release analysed should be a one line file
// the format of its content is <Vendor_ID release Version>
// i.e. "Red Hat Enterprise Linux Workstation release 6.5 (Santiago)"
QByteArray line = getEtcFileFirstLine("/etc/redhat-release");
if (line.isEmpty())
return false;
v.prettyName = QString::fromLatin1(line);
const char keyword[] = "release ";
int releaseIndex = line.indexOf(keyword);
v.productType = QString::fromLatin1(line.mid(0, releaseIndex)).remove(QLatin1Char(' '));
int spaceIndex = line.indexOf(' ', releaseIndex + strlen(keyword));
v.productVersion = QString::fromLatin1(line.mid(releaseIndex + strlen(keyword),
spaceIndex > -1 ? spaceIndex - releaseIndex - int(strlen(keyword)) : -1));
return true;
}
static bool readEtcDebianVersion(QUnixOSVersion &v)
{
// /etc/debian_version analysed should be a one line file
// the format of its content is <Release_ID/sid>
// i.e. "jessie/sid"
QByteArray line = getEtcFileFirstLine("/etc/debian_version");
if (line.isEmpty())
return false;
v.productType = QStringLiteral("Debian");
v.productVersion = QString::fromLatin1(line);
return true;
}
#endif
static bool findUnixOsVersion(QUnixOSVersion &v)
{
if (readOsRelease(v))
return true;
if (readEtcLsbRelease(v))
return true;
#if defined(Q_OS_LINUX)
if (readEtcRedHatRelease(v))
return true;
if (readEtcDebianVersion(v))
return true;
#endif
return false;
}
# endif // USE_ETC_OS_RELEASE
#endif // Q_OS_UNIX
#if defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_EMBEDDED)
static const char *osVer_helper(QOperatingSystemVersion)
{
/* Data:
Cupcake
Donut
Eclair
Eclair
Eclair
Froyo
Gingerbread
Gingerbread
Honeycomb
Honeycomb
Honeycomb
Ice Cream Sandwich
Ice Cream Sandwich
Jelly Bean
Jelly Bean
Jelly Bean
KitKat
KitKat
Lollipop
Lollipop
Marshmallow
Nougat
Nougat
Oreo
*/
static const char versions_string[] =
"\0"
"Cupcake\0"
"Donut\0"
"Eclair\0"
"Froyo\0"
"Gingerbread\0"
"Honeycomb\0"
"Ice Cream Sandwich\0"
"Jelly Bean\0"
"KitKat\0"
"Lollipop\0"
"Marshmallow\0"
"Nougat\0"
"Oreo\0"
"\0";
static const int versions_indices[] = {
0, 0, 0, 1, 9, 15, 15, 15,
22, 28, 28, 40, 40, 40, 50, 50,
69, 69, 69, 80, 80, 87, 87, 96,
108, 108, 115, -1
};
static const int versions_count = (sizeof versions_indices) / (sizeof versions_indices[0]);
// https://source.android.com/source/build-numbers.html
// https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels
const int sdk_int = QJNIObjectPrivate::getStaticField<jint>("android/os/Build$VERSION", "SDK_INT");
return &versions_string[versions_indices[qBound(0, sdk_int, versions_count - 1)]];
}
#endif
/*!
\since 5.4
Returns the architecture of the CPU that Qt was compiled for, in text
format. Note that this may not match the actual CPU that the application is
running on if there's an emulation layer or if the CPU supports multiple
architectures (like x86-64 processors supporting i386 applications). To
detect that, use currentCpuArchitecture().
Values returned by this function are stable and will not change over time,
so applications can rely on the returned value as an identifier, except
that new CPU types may be added over time.
Typical returned values are (note: list not exhaustive):
\list
\li "arm"
\li "arm64"
\li "i386"
\li "ia64"
\li "mips"
\li "mips64"
\li "power"
\li "power64"
\li "sparc"
\li "sparcv9"
\li "x86_64"
\endlist
\sa QSysInfo::buildAbi(), QSysInfo::currentCpuArchitecture()
*/
QString QSysInfo::buildCpuArchitecture()
{
return QStringLiteral(ARCH_PROCESSOR);
}
/*!
\since 5.4
Returns the architecture of the CPU that the application is running on, in
text format. Note that this function depends on what the OS will report and
may not detect the actual CPU architecture if the OS hides that information
or is unable to provide it. For example, a 32-bit OS running on a 64-bit
CPU is usually unable to determine the CPU is actually capable of running
64-bit programs.
Values returned by this function are mostly stable: an attempt will be made
to ensure that they stay constant over time and match the values returned
by QSysInfo::builldCpuArchitecture(). However, due to the nature of the
operating system functions being used, there may be discrepancies.
Typical returned values are (note: list not exhaustive):
\list
\li "arm"
\li "arm64"
\li "i386"
\li "ia64"
\li "mips"
\li "mips64"
\li "power"
\li "power64"
\li "sparc"
\li "sparcv9"
\li "x86_64"
\endlist
\sa QSysInfo::buildAbi(), QSysInfo::buildCpuArchitecture()
*/
QString QSysInfo::currentCpuArchitecture()
{
#if defined(Q_OS_WIN)
// We don't need to catch all the CPU architectures in this function;
// only those where the host CPU might be different than the build target
// (usually, 64-bit platforms).
SYSTEM_INFO info;
GetNativeSystemInfo(&info);
switch (info.wProcessorArchitecture) {
# ifdef PROCESSOR_ARCHITECTURE_AMD64
case PROCESSOR_ARCHITECTURE_AMD64:
return QStringLiteral("x86_64");
# endif
# ifdef PROCESSOR_ARCHITECTURE_IA32_ON_WIN64
case PROCESSOR_ARCHITECTURE_IA32_ON_WIN64:
# endif
case PROCESSOR_ARCHITECTURE_IA64:
return QStringLiteral("ia64");
}
#elif defined(Q_OS_DARWIN) && !defined(Q_OS_MACOS)
// iOS-based OSes do not return the architecture on uname(2)'s result.
return buildCpuArchitecture();
#elif defined(Q_OS_UNIX)
long ret = -1;
struct utsname u;
# if defined(Q_OS_SOLARIS)
// We need a special call for Solaris because uname(2) on x86 returns "i86pc" for
// both 32- and 64-bit CPUs. Reference:
// http://docs.oracle.com/cd/E18752_01/html/816-5167/sysinfo-2.html#REFMAN2sysinfo-2
// http://fxr.watson.org/fxr/source/common/syscall/systeminfo.c?v=OPENSOLARIS
// http://fxr.watson.org/fxr/source/common/conf/param.c?v=OPENSOLARIS;im=10#L530
if (ret == -1)
ret = sysinfo(SI_ARCHITECTURE_64, u.machine, sizeof u.machine);
# endif
if (ret == -1)
ret = uname(&u);
// we could use detectUnixVersion() above, but we only need a field no other function does
if (ret != -1) {
// the use of QT_BUILD_INTERNAL here is simply to ensure all branches build
// as we don't often build on some of the less common platforms
# if defined(Q_PROCESSOR_ARM) || defined(QT_BUILD_INTERNAL)
if (strcmp(u.machine, "aarch64") == 0)
return QStringLiteral("arm64");
if (strncmp(u.machine, "armv", 4) == 0)
return QStringLiteral("arm");
# endif
# if defined(Q_PROCESSOR_POWER) || defined(QT_BUILD_INTERNAL)
// harmonize "powerpc" and "ppc" to "power"
if (strncmp(u.machine, "ppc", 3) == 0)
return QLatin1String("power") + QLatin1String(u.machine + 3);
if (strncmp(u.machine, "powerpc", 7) == 0)
return QLatin1String("power") + QLatin1String(u.machine + 7);
if (strcmp(u.machine, "Power Macintosh") == 0)
return QLatin1String("power");
# endif
# if defined(Q_PROCESSOR_SPARC) || defined(QT_BUILD_INTERNAL)
// Solaris sysinfo(2) (above) uses "sparcv9", but uname -m says "sun4u";
// Linux says "sparc64"
if (strcmp(u.machine, "sun4u") == 0 || strcmp(u.machine, "sparc64") == 0)
return QStringLiteral("sparcv9");
if (strcmp(u.machine, "sparc32") == 0)
return QStringLiteral("sparc");
# endif
# if defined(Q_PROCESSOR_X86) || defined(QT_BUILD_INTERNAL)
// harmonize all "i?86" to "i386"
if (strlen(u.machine) == 4 && u.machine[0] == 'i'
&& u.machine[2] == '8' && u.machine[3] == '6')
return QStringLiteral("i386");
if (strcmp(u.machine, "amd64") == 0) // Solaris
return QStringLiteral("x86_64");
# endif
return QString::fromLatin1(u.machine);
}
#endif
return buildCpuArchitecture();
}
/*!
\since 5.4
Returns the full architecture string that Qt was compiled for. This string
is useful for identifying different, incompatible builds. For example, it
can be used as an identifier to request an upgrade package from a server.
The values returned from this function are kept stable as follows: the
mandatory components of the result will not change in future versions of
Qt, but optional suffixes may be added.
The returned value is composed of three or more parts, separated by dashes
("-"). They are:
\table
\header \li Component \li Value
\row \li CPU Architecture \li The same as QSysInfo::buildCpuArchitecture(), such as "arm", "i386", "mips" or "x86_64"
\row \li Endianness \li "little_endian" or "big_endian"
\row \li Word size \li Whether it's a 32- or 64-bit application. Possible values are:
"llp64" (Windows 64-bit), "lp64" (Unix 64-bit), "ilp32" (32-bit)
\row \li (Optional) ABI \li Zero or more components identifying different ABIs possible in this architecture.
Currently, Qt has optional ABI components for ARM and MIPS processors: one
component is the main ABI (such as "eabi", "o32", "n32", "o64"); another is
whether the calling convention is using hardware floating point registers ("hardfloat"
is present).
Additionally, if Qt was configured with \c{-qreal float}, the ABI option tag "qreal_float"
will be present. If Qt was configured with another type as qreal, that type is present after
"qreal_", with all characters other than letters and digits escaped by an underscore, followed
by two hex digits. For example, \c{-qreal long double} becomes "qreal_long_20double".
\endtable
\sa QSysInfo::buildCpuArchitecture()
*/
QString QSysInfo::buildAbi()
{
#ifdef Q_COMPILER_UNICODE_STRINGS
// ARCH_FULL is a concatenation of strings (incl. ARCH_PROCESSOR), which breaks
// QStringLiteral on MSVC. Since the concatenation behavior we want is specified
// the same C++11 paper as the Unicode strings, we'll use that macro and hope
// that Microsoft implements the new behavior when they add support for Unicode strings.
return QStringLiteral(ARCH_FULL);
#else
return QLatin1String(ARCH_FULL);
#endif
}
static QString unknownText()
{
return QStringLiteral("unknown");
}
/*!
\since 5.4
Returns the type of the operating system kernel Qt was compiled for. It's
also the kernel the application is running on, unless the host operating
system is running a form of compatibility or virtualization layer.
Values returned by this function are stable and will not change over time,
so applications can rely on the returned value as an identifier, except
that new OS kernel types may be added over time.
On Windows, this function returns the type of Windows kernel, like "winnt".
On Unix systems, it returns the same as the output of \c{uname
-s} (lowercased).
\note This function may return surprising values: it returns "linux"
for all operating systems running Linux (including Android), "qnx" for all
operating systems running QNX, "freebsd" for
Debian/kFreeBSD, and "darwin" for \macos and iOS. For information on the type
of product the application is running on, see productType().
\sa QFileSelector, kernelVersion(), productType(), productVersion(), prettyProductName()
*/
QString QSysInfo::kernelType()
{
#if defined(Q_OS_WIN)
return QStringLiteral("winnt");
#elif defined(Q_OS_UNIX)
struct utsname u;
if (uname(&u) == 0)
return QString::fromLatin1(u.sysname).toLower();
#endif
return unknownText();
}
/*!
\since 5.4
Returns the release version of the operating system kernel. On Windows, it
returns the version of the NT kernel. On Unix systems, including
Android and \macos, it returns the same as the \c{uname -r}
command would return.
If the version could not be determined, this function may return an empty
string.
\sa kernelType(), productType(), productVersion(), prettyProductName()
*/
QString QSysInfo::kernelVersion()
{
#ifdef Q_OS_WIN
const auto osver = QOperatingSystemVersion::current();
return QString::number(osver.majorVersion()) + QLatin1Char('.') + QString::number(osver.minorVersion())
+ QLatin1Char('.') + QString::number(osver.microVersion());
#else
struct utsname u;
if (uname(&u) == 0)
return QString::fromLatin1(u.release);
return QString();
#endif
}
/*!
\since 5.4
Returns the product name of the operating system this application is
running in. If the application is running on some sort of emulation or
virtualization layer (such as WINE on a Unix system), this function will
inspect the emulation / virtualization layer.
Values returned by this function are stable and will not change over time,
so applications can rely on the returned value as an identifier, except
that new OS types may be added over time.
\b{Linux and Android note}: this function returns "android" for Linux
systems running Android userspace, notably when using the Bionic library.
For all other Linux systems, regardless of C library being used, it tries
to determine the distribution name and returns that. If determining the
distribution name failed, it returns "unknown".
\b{\macos note}: this function returns "osx" for all \macos systems,
regardless of Apple naming convention. The returned string will be updated
for Qt 6. Note that this function erroneously returned "macos" for \macos
10.12 in Qt versions 5.6.2, 5.7.1, and 5.8.0.
\b{Darwin, iOS, tvOS, and watchOS note}: this function returns "ios" for
iOS systems, "tvos" for tvOS systems, "watchos" for watchOS systems, and
"darwin" in case the system could not be determined.
\b{FreeBSD note}: this function returns "debian" for Debian/kFreeBSD and
"unknown" otherwise.
\b{Windows note}: this function "winrt" for WinRT builds, and "windows"
for normal desktop builds.
For other Unix-type systems, this function usually returns "unknown".
\sa QFileSelector, kernelType(), kernelVersion(), productVersion(), prettyProductName()
*/
QString QSysInfo::productType()
{
// similar, but not identical to QFileSelectorPrivate::platformSelectors
#if defined(Q_OS_WINRT)
return QStringLiteral("winrt");
#elif defined(Q_OS_WIN)
return QStringLiteral("windows");
#elif defined(Q_OS_QNX)
return QStringLiteral("qnx");
#elif defined(Q_OS_ANDROID)
return QStringLiteral("android");
#elif defined(Q_OS_IOS)
return QStringLiteral("ios");
#elif defined(Q_OS_TVOS)
return QStringLiteral("tvos");
#elif defined(Q_OS_WATCHOS)
return QStringLiteral("watchos");
#elif defined(Q_OS_MACOS)
// ### Qt6: remove fallback
# if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
return QStringLiteral("macos");
# else
return QStringLiteral("osx");
# endif
#elif defined(Q_OS_DARWIN)
return QStringLiteral("darwin");
#elif defined(USE_ETC_OS_RELEASE) // Q_OS_UNIX
QUnixOSVersion unixOsVersion;
findUnixOsVersion(unixOsVersion);
if (!unixOsVersion.productType.isEmpty())
return unixOsVersion.productType;
#endif
return unknownText();
}
/*!
\since 5.4
Returns the product version of the operating system in string form. If the
version could not be determined, this function returns "unknown".
It will return the Android, iOS, \macos, Windows full-product
versions on those systems.
Typical returned values are (note: list not exhaustive):
\list
\li "2016.09" (Amazon Linux AMI 2016.09)
\li "7.1" (Android Nougat)
\li "25" (Fedora 25)
\li "10.1" (iOS 10.1)
\li "10.12" (macOS Sierra)
\li "10.0" (tvOS 10)
\li "16.10" (Ubuntu 16.10)
\li "3.1" (watchOS 3.1)
\li "7 SP 1" (Windows 7 Service Pack 1)
\li "8.1" (Windows 8.1)
\li "10" (Windows 10)
\li "Server 2016" (Windows Server 2016)
\endlist
On Linux systems, it will try to determine the distribution version and will
return that. This is also done on Debian/kFreeBSD, so this function will
return Debian version in that case.
In all other Unix-type systems, this function always returns "unknown".
\note The version string returned from this function is not guaranteed to
be orderable. On Linux, the version of
the distribution may jump unexpectedly, please refer to the distribution's
documentation for versioning practices.
\sa kernelType(), kernelVersion(), productType(), prettyProductName()
*/
QString QSysInfo::productVersion()
{
#if defined(Q_OS_ANDROID) || defined(Q_OS_DARWIN)
const auto version = QOperatingSystemVersion::current();
return QString::number(version.majorVersion()) + QLatin1Char('.') + QString::number(version.minorVersion());
#elif defined(Q_OS_WIN)
const char *version = osVer_helper();
if (version) {
const QLatin1Char spaceChar(' ');
return QString::fromLatin1(version).remove(spaceChar).toLower() + winSp_helper().remove(spaceChar).toLower();
}
// fall through
#elif defined(USE_ETC_OS_RELEASE) // Q_OS_UNIX
QUnixOSVersion unixOsVersion;
findUnixOsVersion(unixOsVersion);
if (!unixOsVersion.productVersion.isEmpty())
return unixOsVersion.productVersion;
#endif
// fallback
return unknownText();
}
/*!
\since 5.4
Returns a prettier form of productType() and productVersion(), containing
other tokens like the operating system type, codenames and other
information. The result of this function is suitable for displaying to the
user, but not for long-term storage, as the string may change with updates
to Qt.
If productType() is "unknown", this function will instead use the
kernelType() and kernelVersion() functions.
\sa kernelType(), kernelVersion(), productType(), productVersion()
*/
QString QSysInfo::prettyProductName()
{
#if (defined(Q_OS_ANDROID) && !defined(Q_OS_ANDROID_EMBEDDED)) || defined(Q_OS_DARWIN) || defined(Q_OS_WIN)
const auto version = QOperatingSystemVersion::current();
const int majorVersion = version.majorVersion();
const QString versionString = QString::number(majorVersion) + QLatin1Char('.')
+ QString::number(version.minorVersion());
QString result = version.name() + QLatin1Char(' ');
const char *name = osVer_helper(version);
if (!name)
return result + versionString;
result += QLatin1String(name);
# if !defined(Q_OS_WIN) || defined(Q_OS_WINRT)
return result + QLatin1String(" (") + versionString + QLatin1Char(')');
# else
// (resembling winver.exe): Windows 10 "Windows 10 Version 1809"
if (majorVersion >= 10) {
const auto releaseId = windows10ReleaseId();
if (!releaseId.isEmpty())
result += QLatin1String(" Version ") + releaseId;
return result;
}
// Windows 7: "Windows 7 Version 6.1 (Build 7601: Service Pack 1)"
result += QLatin1String(" Version ") + versionString + QLatin1String(" (");
const auto build = windows7Build();
if (!build.isEmpty())
result += QLatin1String("Build ") + build;
const auto servicePack = winSp_helper();
if (!servicePack.isEmpty())
result += QLatin1String(": ") + servicePack;
return result + QLatin1Char(')');
# endif // Windows
#elif defined(Q_OS_HAIKU)
return QLatin1String("Haiku ") + productVersion();
#elif defined(Q_OS_UNIX)
# ifdef USE_ETC_OS_RELEASE
QUnixOSVersion unixOsVersion;
findUnixOsVersion(unixOsVersion);
if (!unixOsVersion.prettyName.isEmpty())
return unixOsVersion.prettyName;
# endif
struct utsname u;
if (uname(&u) == 0)
return QString::fromLatin1(u.sysname) + QLatin1Char(' ') + QString::fromLatin1(u.release);
#endif
return unknownText();
}
#ifndef QT_BOOTSTRAPPED
/*!
\since 5.6
Returns this machine's host name, if one is configured. Note that hostnames
are not guaranteed to be globally unique, especially if they were
configured automatically.
This function does not guarantee the returned host name is a Fully
Qualified Domain Name (FQDN). For that, use QHostInfo to resolve the
returned name to an FQDN.
This function returns the same as QHostInfo::localHostName().
\sa QHostInfo::localDomainName, machineUniqueId()
*/
QString QSysInfo::machineHostName()
{
// the hostname can change, so we can't cache it
#if defined(Q_OS_LINUX)
// gethostname(3) on Linux just calls uname(2), so do it ourselves
// and avoid a memcpy
struct utsname u;
if (uname(&u) == 0)
return QString::fromLocal8Bit(u.nodename);
return QString();
#else
# ifdef Q_OS_WIN
// Important: QtNetwork depends on machineHostName() initializing ws2_32.dll
winsockInit();
# endif
char hostName[512];
if (gethostname(hostName, sizeof(hostName)) == -1)
return QString();
hostName[sizeof(hostName) - 1] = '\0';
return QString::fromLocal8Bit(hostName);
#endif
}
#endif // QT_BOOTSTRAPPED
enum {
UuidStringLen = sizeof("00000000-0000-0000-0000-000000000000") - 1
};
/*!
\since 5.11
Returns a unique ID for this machine, if one can be determined. If no
unique ID could be determined, this function returns an empty byte array.
Unlike machineHostName(), the value returned by this function is likely
globally unique.
A unique ID is useful in network operations to identify this machine for an
extended period of time, when the IP address could change or if this
machine could have more than one IP address. For example, the ID could be
used when communicating with a server or when storing device-specific data
in shared network storage.
Note that on some systems, this value will persist across reboots and on
some it will not. Applications should not blindly depend on this fact
without verifying the OS capabilities. In particular, on Linux systems,
this ID is usually permanent and it matches the D-Bus machine ID, except
for nodes without their own storage (replicated nodes).
\sa machineHostName(), bootUniqueId()
*/
QByteArray QSysInfo::machineUniqueId()
{
#if defined(Q_OS_DARWIN) && __has_include(<IOKit/IOKitLib.h>)
char uuid[UuidStringLen + 1];
io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));
QCFString stringRef = (CFStringRef)IORegistryEntryCreateCFProperty(service, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0);
CFStringGetCString(stringRef, uuid, sizeof(uuid), kCFStringEncodingMacRoman);
return QByteArray(uuid);
#elif defined(Q_OS_BSD4) && defined(KERN_HOSTUUID)
char uuid[UuidStringLen + 1];
size_t uuidlen = sizeof(uuid);
int name[] = { CTL_KERN, KERN_HOSTUUID };
if (sysctl(name, sizeof name / sizeof name[0], &uuid, &uuidlen, nullptr, 0) == 0
&& uuidlen == sizeof(uuid))
return QByteArray(uuid, uuidlen - 1);
#elif defined(Q_OS_UNIX)
// The modern name on Linux is /etc/machine-id, but that path is
// unlikely to exist on non-Linux (non-systemd) systems. The old
// path is more than enough.
static const char fullfilename[] = "/usr/local/var/lib/dbus/machine-id";
const char *firstfilename = fullfilename + sizeof("/usr/local") - 1;
int fd = qt_safe_open(firstfilename, O_RDONLY);
if (fd == -1 && errno == ENOENT)
fd = qt_safe_open(fullfilename, O_RDONLY);
if (fd != -1) {
char buffer[32]; // 128 bits, hex-encoded
qint64 len = qt_safe_read(fd, buffer, sizeof(buffer));
qt_safe_close(fd);
if (len != -1)
return QByteArray(buffer, len);
}
#elif defined(Q_OS_WIN) && !defined(Q_OS_WINRT)
// Let's poke at the registry
// ### Qt 6: Use new helpers from qwinregistry.cpp (once bootstrap builds are obsolete)
HKEY key = NULL;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, L"SOFTWARE\\Microsoft\\Cryptography", 0, KEY_READ | KEY_WOW64_64KEY, &key)
== ERROR_SUCCESS) {
wchar_t buffer[UuidStringLen + 1];
DWORD size = sizeof(buffer);
bool ok = (RegQueryValueEx(key, L"MachineGuid", NULL, NULL, (LPBYTE)buffer, &size) ==
ERROR_SUCCESS);
RegCloseKey(key);
if (ok)
return QStringView(buffer, (size - 1) / 2).toLatin1();
}
#endif
return QByteArray();
}
/*!
\since 5.11
Returns a unique ID for this machine's boot, if one can be determined. If
no unique ID could be determined, this function returns an empty byte
array. This value is expected to change after every boot and can be
considered globally unique.
This function is currently only implemented for Linux and Apple operating
systems.
\sa machineUniqueId()
*/
QByteArray QSysInfo::bootUniqueId()
{
#ifdef Q_OS_LINUX
// use low-level API here for simplicity
int fd = qt_safe_open("/proc/sys/kernel/random/boot_id", O_RDONLY);
if (fd != -1) {
char uuid[UuidStringLen];
qint64 len = qt_safe_read(fd, uuid, sizeof(uuid));
qt_safe_close(fd);
if (len == UuidStringLen)
return QByteArray(uuid, UuidStringLen);
}
#elif defined(Q_OS_DARWIN)
// "kern.bootsessionuuid" is only available by name
char uuid[UuidStringLen + 1];
size_t uuidlen = sizeof(uuid);
if (sysctlbyname("kern.bootsessionuuid", uuid, &uuidlen, nullptr, 0) == 0
&& uuidlen == sizeof(uuid))
return QByteArray(uuid, uuidlen - 1);
#endif
return QByteArray();
};
/*!
\macro void Q_ASSERT(bool test)
\relates <QtGlobal>
Prints a warning message containing the source code file name and
line number if \a test is \c false.
Q_ASSERT() is useful for testing pre- and post-conditions
during development. It does nothing if \c QT_NO_DEBUG was defined
during compilation.
Example:
\snippet code/src_corelib_global_qglobal.cpp 17
If \c b is zero, the Q_ASSERT statement will output the following
message using the qFatal() function:
\snippet code/src_corelib_global_qglobal.cpp 18
\sa Q_ASSERT_X(), qFatal(), {Debugging Techniques}
*/
/*!
\macro void Q_ASSERT_X(bool test, const char *where, const char *what)
\relates <QtGlobal>
Prints the message \a what together with the location \a where,
the source file name and line number if \a test is \c false.
Q_ASSERT_X is useful for testing pre- and post-conditions during
development. It does nothing if \c QT_NO_DEBUG was defined during
compilation.
Example:
\snippet code/src_corelib_global_qglobal.cpp 19
If \c b is zero, the Q_ASSERT_X statement will output the following
message using the qFatal() function:
\snippet code/src_corelib_global_qglobal.cpp 20
\sa Q_ASSERT(), qFatal(), {Debugging Techniques}
*/
/*!
\macro void Q_ASSUME(bool expr)
\relates <QtGlobal>
\since 5.0
Causes the compiler to assume that \a expr is \c true. This macro is useful
for improving code generation, by providing the compiler with hints about
conditions that it would not otherwise know about. However, there is no
guarantee that the compiler will actually use those hints.
This macro could be considered a "lighter" version of \l{Q_ASSERT()}. While
Q_ASSERT will abort the program's execution if the condition is \c false,
Q_ASSUME will tell the compiler not to generate code for those conditions.
Therefore, it is important that the assumptions always hold, otherwise
undefined behaviour may occur.
If \a expr is a constantly \c false condition, Q_ASSUME will tell the compiler
that the current code execution cannot be reached. That is, Q_ASSUME(false)
is equivalent to Q_UNREACHABLE().
In debug builds the condition is enforced by an assert to facilitate debugging.
\note Q_LIKELY() tells the compiler that the expression is likely, but not
the only possibility. Q_ASSUME tells the compiler that it is the only
possibility.
\sa Q_ASSERT(), Q_UNREACHABLE(), Q_LIKELY()
*/
/*!
\macro void Q_UNREACHABLE()
\relates <QtGlobal>
\since 5.0
Tells the compiler that the current point cannot be reached by any
execution, so it may optimize any code paths leading here as dead code, as
well as code continuing from here.
This macro is useful to mark impossible conditions. For example, given the
following enum:
\snippet code/src_corelib_global_qglobal.cpp qunreachable-enum
One can write a switch table like so:
\snippet code/src_corelib_global_qglobal.cpp qunreachable-switch
The advantage of inserting Q_UNREACHABLE() at that point is that the
compiler is told not to generate code for a shape variable containing that
value. If the macro is missing, the compiler will still generate the
necessary comparisons for that value. If the case label were removed, some
compilers could produce a warning that some enum values were not checked.
By using this macro in impossible conditions, code coverage may be improved
as dead code paths may be eliminated.
In debug builds the condition is enforced by an assert to facilitate debugging.
\sa Q_ASSERT(), Q_ASSUME(), qFatal()
*/
/*!
\macro void Q_FALLTHROUGH()
\relates <QtGlobal>
\since 5.8
Can be used in switch statements at the end of case block to tell the compiler
and other developers that that the lack of a break statement is intentional.
This is useful since a missing break statement is often a bug, and some
compilers can be configured to emit warnings when one is not found.
\sa Q_UNREACHABLE()
*/
/*!
\macro void Q_CHECK_PTR(void *pointer)
\relates <QtGlobal>
If \a pointer is 0, prints a message containing the source
code's file name and line number, saying that the program ran out
of memory and aborts program execution. It throws \c std::bad_alloc instead
if exceptions are enabled.
Q_CHECK_PTR does nothing if \c QT_NO_DEBUG and \c QT_NO_EXCEPTIONS were
defined during compilation. Therefore you must not use Q_CHECK_PTR to check
for successful memory allocations because the check will be disabled in
some cases.
Example:
\snippet code/src_corelib_global_qglobal.cpp 21
\sa qWarning(), {Debugging Techniques}
*/
/*!
\fn template <typename T> T *q_check_ptr(T *p)
\relates <QtGlobal>
Uses Q_CHECK_PTR on \a p, then returns \a p.
This can be used as an inline version of Q_CHECK_PTR.
*/
/*!
\macro const char* Q_FUNC_INFO()
\relates <QtGlobal>
Expands to a string that describe the function the macro resides in. How this string looks
more specifically is compiler dependent. With GNU GCC it is typically the function signature,
while with other compilers it might be the line and column number.
Q_FUNC_INFO can be conveniently used with qDebug(). For example, this function:
\snippet code/src_corelib_global_qglobal.cpp 22
when instantiated with the integer type, will with the GCC compiler produce:
\tt{const TInputType& myMin(const TInputType&, const TInputType&) [with TInputType = int] was called with value1: 3 value2: 4}
If this macro is used outside a function, the behavior is undefined.
*/
/*!
\internal
The Q_CHECK_PTR macro calls this function if an allocation check
fails.
*/
void qt_check_pointer(const char *n, int l) noexcept
{
// make separate printing calls so that the first one may flush;
// the second one could want to allocate memory (fputs prints a
// newline and stderr auto-flushes).
fputs("Out of memory", stderr);
fprintf(stderr, " in %s, line %d\n", n, l);
std::terminate();
}
/*
\internal
Allows you to throw an exception without including <new>
Called internally from Q_CHECK_PTR on certain OS combinations
*/
void qBadAlloc()
{
QT_THROW(std::bad_alloc());
}
#ifndef QT_NO_EXCEPTIONS
/*
\internal
Allows you to call std::terminate() without including <exception>.
Called internally from QT_TERMINATE_ON_EXCEPTION
*/
Q_NORETURN void qTerminate() noexcept
{
std::terminate();
}
#endif
/*
The Q_ASSERT macro calls this function when the test fails.
*/
void qt_assert(const char *assertion, const char *file, int line) noexcept
{
QMessageLogger(file, line, nullptr).fatal("ASSERT: \"%s\" in file %s, line %d", assertion, file, line);
}
/*
The Q_ASSERT_X macro calls this function when the test fails.
*/
void qt_assert_x(const char *where, const char *what, const char *file, int line) noexcept
{
QMessageLogger(file, line, nullptr).fatal("ASSERT failure in %s: \"%s\", file %s, line %d", where, what, file, line);
}
/*
Dijkstra's bisection algorithm to find the square root of an integer.
Deliberately not exported as part of the Qt API, but used in both
qsimplerichtext.cpp and qgfxraster_qws.cpp
*/
Q_CORE_EXPORT Q_DECL_CONST_FUNCTION unsigned int qt_int_sqrt(unsigned int n)
{
// n must be in the range 0...UINT_MAX/2-1
if (n >= (UINT_MAX>>2)) {
unsigned int r = 2 * qt_int_sqrt(n / 4);
unsigned int r2 = r + 1;
return (n >= r2 * r2) ? r2 : r;
}
uint h, p= 0, q= 1, r= n;
while (q <= n)
q <<= 2;
while (q != 1) {
q >>= 2;
h= p + q;
p >>= 1;
if (r >= h) {
p += q;
r -= h;
}
}
return p;
}
void *qMemCopy(void *dest, const void *src, size_t n) { return memcpy(dest, src, n); }
void *qMemSet(void *dest, int c, size_t n) { return memset(dest, c, n); }
// In the C runtime on all platforms access to the environment is not thread-safe. We
// add thread-safety for the Qt wrappers.
static QBasicMutex environmentMutex;
/*
Wraps tzset(), which accesses the environment, so should only be called while
we hold the lock on the environment mutex.
*/
void qTzSet()
{
const auto locker = qt_scoped_lock(environmentMutex);
#if defined(Q_OS_WIN)
_tzset();
#else
tzset();
#endif // Q_OS_WIN
}
/*
Wrap mktime(), which is specified to behave as if it called tzset(), hence
shares its implicit environment-dependence.
*/
time_t qMkTime(struct tm *when)
{
const auto locker = qt_scoped_lock(environmentMutex);
return mktime(when);
}
// Also specified to behave as if they call tzset():
// localtime() -- but not localtime_r(), which we use when threaded
// strftime() -- not used (except in tests)
/*!
\relates <QtGlobal>
\threadsafe
Returns the value of the environment variable with name \a varName as a
QByteArray. If no variable by that name is found in the environment, this
function returns a default-constructed QByteArray.
The Qt environment manipulation functions are thread-safe, but this
requires that the C library equivalent functions like getenv and putenv are
not directly called.
To convert the data to a QString use QString::fromLocal8Bit().
\note on desktop Windows, qgetenv() may produce data loss if the
original string contains Unicode characters not representable in the
ANSI encoding. Use qEnvironmentVariable() instead.
On Unix systems, this function is lossless.
\sa qputenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet(),
qEnvironmentVariableIsEmpty()
*/
QByteArray qgetenv(const char *varName)
{
const auto locker = qt_scoped_lock(environmentMutex);
#ifdef Q_CC_MSVC
size_t requiredSize = 0;
QByteArray buffer;
getenv_s(&requiredSize, 0, 0, varName);
if (requiredSize == 0)
return buffer;
buffer.resize(int(requiredSize));
getenv_s(&requiredSize, buffer.data(), requiredSize, varName);
// requiredSize includes the terminating null, which we don't want.
Q_ASSERT(buffer.endsWith('\0'));
buffer.chop(1);
return buffer;
#else
return QByteArray(::getenv(varName));
#endif
}
/*!
\fn QString qEnvironmentVariable(const char *varName, const QString &defaultValue)
\fn QString qEnvironmentVariable(const char *varName)
\relates <QtGlobal>
\since 5.10
These functions return the value of the environment variable, \a varName, as a
QString. If no variable \a varName is found in the environment and \a defaultValue
is provided, \a defaultValue is returned. Otherwise QString() is returned.
The Qt environment manipulation functions are thread-safe, but this
requires that the C library equivalent functions like getenv and putenv are
not directly called.
The following table describes how to choose between qgetenv() and
qEnvironmentVariable():
\table
\header \li Condition \li Recommendation
\row
\li Variable contains file paths or user text
\li qEnvironmentVariable()
\row
\li Windows-specific code
\li qEnvironmentVariable()
\row
\li Unix-specific code, destination variable is not QString and/or is
used to interface with non-Qt APIs
\li qgetenv()
\row
\li Destination variable is a QString
\li qEnvironmentVariable()
\row
\li Destination variable is a QByteArray or std::string
\li qgetenv()
\endtable
\note on Unix systems, this function may produce data loss if the original
string contains arbitrary binary data that cannot be decoded by the locale
codec. Use qgetenv() instead for that case. On Windows, this function is
lossless.
\note the variable name \a varName must contain only US-ASCII characters.
\sa qputenv(), qgetenv(), qEnvironmentVariableIsSet(), qEnvironmentVariableIsEmpty()
*/
QString qEnvironmentVariable(const char *varName, const QString &defaultValue)
{
#if defined(Q_OS_WIN) && !defined(Q_OS_WINRT)
const auto locker = qt_scoped_lock(environmentMutex);
QVarLengthArray<wchar_t, 32> wname(int(strlen(varName)) + 1);
for (int i = 0; i < wname.size(); ++i) // wname.size() is correct: will copy terminating null
wname[i] = uchar(varName[i]);
size_t requiredSize = 0;
QString buffer;
_wgetenv_s(&requiredSize, 0, 0, wname.data());
if (requiredSize == 0)
return defaultValue;
buffer.resize(int(requiredSize));
_wgetenv_s(&requiredSize, reinterpret_cast<wchar_t *>(buffer.data()), requiredSize,
wname.data());
// requiredSize includes the terminating null, which we don't want.
Q_ASSERT(buffer.endsWith(QLatin1Char('\0')));
buffer.chop(1);
return buffer;
#else
QByteArray value = qgetenv(varName);
if (value.isNull())
return defaultValue;
// duplicated in qfile.h (QFile::decodeName)
#if defined(Q_OS_DARWIN)
return QString::fromUtf8(value).normalized(QString::NormalizationForm_C);
#else // other Unix
return QString::fromLocal8Bit(value);
#endif
#endif
}
QString qEnvironmentVariable(const char *varName)
{
return qEnvironmentVariable(varName, QString());
}
/*!
\relates <QtGlobal>
\since 5.1
Returns whether the environment variable \a varName is empty.
Equivalent to
\snippet code/src_corelib_global_qglobal.cpp is-empty
except that it's potentially much faster, and can't throw exceptions.
\sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet()
*/
bool qEnvironmentVariableIsEmpty(const char *varName) noexcept
{
const auto locker = qt_scoped_lock(environmentMutex);
#ifdef Q_CC_MSVC
// we provide a buffer that can only hold the empty string, so
// when the env.var isn't empty, we'll get an ERANGE error (buffer
// too small):
size_t dummy;
char buffer = '\0';
return getenv_s(&dummy, &buffer, 1, varName) != ERANGE;
#else
const char * const value = ::getenv(varName);
return !value || !*value;
#endif
}
/*!
\relates <QtGlobal>
\since 5.5
Returns the numerical value of the environment variable \a varName.
If \a ok is not null, sets \c{*ok} to \c true or \c false depending
on the success of the conversion.
Equivalent to
\snippet code/src_corelib_global_qglobal.cpp to-int
except that it's much faster, and can't throw exceptions.
\note there's a limit on the length of the value, which is sufficient for
all valid values of int, not counting leading zeroes or spaces. Values that
are too long will either be truncated or this function will set \a ok to \c
false.
\sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsSet()
*/
int qEnvironmentVariableIntValue(const char *varName, bool *ok) noexcept
{
static const int NumBinaryDigitsPerOctalDigit = 3;
static const int MaxDigitsForOctalInt =
(std::numeric_limits<uint>::digits + NumBinaryDigitsPerOctalDigit - 1) / NumBinaryDigitsPerOctalDigit;
const auto locker = qt_scoped_lock(environmentMutex);
#ifdef Q_CC_MSVC
// we provide a buffer that can hold any int value:
char buffer[MaxDigitsForOctalInt + 2]; // +1 for NUL +1 for optional '-'
size_t dummy;
if (getenv_s(&dummy, buffer, sizeof buffer, varName) != 0) {
if (ok)
*ok = false;
return 0;
}
#else
const char * const buffer = ::getenv(varName);
if (!buffer || strlen(buffer) > MaxDigitsForOctalInt + 2) {
if (ok)
*ok = false;
return 0;
}
#endif
bool ok_ = true;
const char *endptr;
const qlonglong value = qstrtoll(buffer, &endptr, 0, &ok_);
// Keep the following checks in sync with QByteArray::toInt()
if (!ok_) {
if (ok)
*ok = false;
return 0;
}
if (*endptr != '\0') {
while (ascii_isspace(*endptr))
++endptr;
}
if (*endptr != '\0') {
// we stopped at a non-digit character after converting some digits
if (ok)
*ok = false;
return 0;
}
if (int(value) != value) {
if (ok)
*ok = false;
return 0;
} else if (ok) {
*ok = ok_;
}
return int(value);
}
/*!
\relates <QtGlobal>
\since 5.1
Returns whether the environment variable \a varName is set.
Equivalent to
\snippet code/src_corelib_global_qglobal.cpp is-null
except that it's potentially much faster, and can't throw exceptions.
\sa qgetenv(), qEnvironmentVariable(), qEnvironmentVariableIsEmpty()
*/
bool qEnvironmentVariableIsSet(const char *varName) noexcept
{
const auto locker = qt_scoped_lock(environmentMutex);
#ifdef Q_CC_MSVC
size_t requiredSize = 0;
(void)getenv_s(&requiredSize, 0, 0, varName);
return requiredSize != 0;
#else
return ::getenv(varName) != nullptr;
#endif
}
/*!
\relates <QtGlobal>
This function sets the \a value of the environment variable named
\a varName. It will create the variable if it does not exist. It
returns 0 if the variable could not be set.
Calling qputenv with an empty value removes the environment variable on
Windows, and makes it set (but empty) on Unix. Prefer using qunsetenv()
for fully portable behavior.
\note qputenv() was introduced because putenv() from the standard
C library was deprecated in VC2005 (and later versions). qputenv()
uses the replacement function in VC, and calls the standard C
library's implementation on all other platforms.
\sa qgetenv(), qEnvironmentVariable()
*/
bool qputenv(const char *varName, const QByteArray& value)
{
const auto locker = qt_scoped_lock(environmentMutex);
#if defined(Q_CC_MSVC)
return _putenv_s(varName, value.constData()) == 0;
#elif (defined(_POSIX_VERSION) && (_POSIX_VERSION-0) >= 200112L) || defined(Q_OS_HAIKU)
// POSIX.1-2001 has setenv
return setenv(varName, value.constData(), true) == 0;
#else
QByteArray buffer(varName);
buffer += '=';
buffer += value;
char* envVar = qstrdup(buffer.constData());
int result = putenv(envVar);
if (result != 0) // error. we have to delete the string.
delete[] envVar;
return result == 0;
#endif
}
/*!
\relates <QtGlobal>
This function deletes the variable \a varName from the environment.
Returns \c true on success.
\since 5.1
\sa qputenv(), qgetenv(), qEnvironmentVariable()
*/
bool qunsetenv(const char *varName)
{
const auto locker = qt_scoped_lock(environmentMutex);
#if defined(Q_CC_MSVC)
return _putenv_s(varName, "") == 0;
#elif (defined(_POSIX_VERSION) && (_POSIX_VERSION-0) >= 200112L) || defined(Q_OS_BSD4) || defined(Q_OS_HAIKU)
// POSIX.1-2001, BSD and Haiku have unsetenv
return unsetenv(varName) == 0;
#elif defined(Q_CC_MINGW)
// On mingw, putenv("var=") removes "var" from the environment
QByteArray buffer(varName);
buffer += '=';
return putenv(buffer.constData()) == 0;
#else
// Fallback to putenv("var=") which will insert an empty var into the
// environment and leak it
QByteArray buffer(varName);
buffer += '=';
char *envVar = qstrdup(buffer.constData());
return putenv(envVar) == 0;
#endif
}
/*!
\macro forever
\relates <QtGlobal>
This macro is provided for convenience for writing infinite
loops.
Example:
\snippet code/src_corelib_global_qglobal.cpp 31
It is equivalent to \c{for (;;)}.
If you're worried about namespace pollution, you can disable this
macro by adding the following line to your \c .pro file:
\snippet code/src_corelib_global_qglobal.cpp 32
\sa Q_FOREVER
*/
/*!
\macro Q_FOREVER
\relates <QtGlobal>
Same as \l{forever}.
This macro is available even when \c no_keywords is specified
using the \c .pro file's \c CONFIG variable.
\sa foreach()
*/
/*!
\macro foreach(variable, container)
\relates <QtGlobal>
This macro is used to implement Qt's \c foreach loop. The \a
variable parameter is a variable name or variable definition; the
\a container parameter is a Qt container whose value type
corresponds to the type of the variable. See \l{The foreach
Keyword} for details.
If you're worried about namespace pollution, you can disable this
macro by adding the following line to your \c .pro file:
\snippet code/src_corelib_global_qglobal.cpp 33
\note Since Qt 5.7, the use of this macro is discouraged. It will
be removed in a future version of Qt. Please use C++11 range-for,
possibly with qAsConst(), as needed.
\sa qAsConst()
*/
/*!
\macro Q_FOREACH(variable, container)
\relates <QtGlobal>
Same as foreach(\a variable, \a container).
This macro is available even when \c no_keywords is specified
using the \c .pro file's \c CONFIG variable.
\note Since Qt 5.7, the use of this macro is discouraged. It will
be removed in a future version of Qt. Please use C++11 range-for,
possibly with qAsConst(), as needed.
\sa qAsConst()
*/
/*!
\fn template <typename T> typename std::add_const<T>::type &qAsConst(T &t)
\relates <QtGlobal>
\since 5.7
Returns \a t cast to \c{const T}.
This function is a Qt implementation of C++17's std::as_const(),
a cast function like std::move(). But while std::move() turns
lvalues into rvalues, this function turns non-const lvalues into
const lvalues. Like std::as_const(), it doesn't work on rvalues,
because it cannot be efficiently implemented for rvalues without
leaving dangling references.
Its main use in Qt is to prevent implicitly-shared Qt containers
from detaching:
\snippet code/src_corelib_global_qglobal.cpp as-const-0
Of course, in this case, you could (and probably should) have declared
\c s as \c const in the first place:
\snippet code/src_corelib_global_qglobal.cpp as-const-1
but often that is not easily possible.
It is important to note that qAsConst() does not copy its argument,
it just performs a \c{const_cast<const T&>(t)}. This is also the reason
why it is designed to fail for rvalues: The returned reference would go
stale too soon. So while this works (but detaches the returned object):
\snippet code/src_corelib_global_qglobal.cpp as-const-2
this would not:
\snippet code/src_corelib_global_qglobal.cpp as-const-3
To prevent this construct from compiling (and failing at runtime), qAsConst() has
a second, deleted, overload which binds to rvalues.
*/
/*!
\fn template <typename T> void qAsConst(const T &&t)
\relates <QtGlobal>
\since 5.7
\overload
This overload is deleted to prevent a dangling reference in code like
\snippet code/src_corelib_global_qglobal.cpp as-const-4
*/
/*!
\fn template <typename T, typename U = T> T qExchange(T &obj, U &&newValue)
\relates <QtGlobal>
\since 5.14
Replaces the value of \a obj with \a newValue and returns the old value of \a obj.
This is Qt's implementation of std::exchange(). It differs from std::exchange()
only in that it is \c constexpr already in C++14, and available on all supported
compilers.
Here is how to use qExchange() to implement move constructors:
\code
MyClass(MyClass &&other)
: m_pointer{qExchange(other.m_pointer, nullptr)},
m_int{qExchange(other.m_int, 0)},
m_vector{std::move(other.m_vector)},
...
\endcode
For members of class type, we can use std::move(), as their move-constructor will
do the right thing. But for scalar types such as raw pointers or integer type, move
is the same as copy, which, particularly for pointers, is not what we expect. So, we
cannot use std::move() for such types, but we can use std::exchange()/qExchange() to
make sure the source object's member is already reset by the time we get to the
initialization of our next data member, which might come in handy if the constructor
exits with an exception.
Here is how to use qExchange() to write a loop that consumes the collection it
iterates over:
\code
for (auto &e : qExchange(collection, {})
doSomethingWith(e);
\endcode
Which is equivalent to the following, much more verbose code:
\code
{
auto tmp = std::move(collection);
collection = {}; // or collection.clear()
for (auto &e : tmp)
doSomethingWith(e);
} // destroys 'tmp'
\endcode
This is perfectly safe, as the for-loop keeps the result of qExchange() alive for as
long as the loop runs, saving the declaration of a temporary variable. Be aware, though,
that qExchange() returns a non-const object, so Qt containers may detach.
*/
/*!
\macro QT_TR_NOOP(sourceText)
\relates <QtGlobal>
Marks the UTF-8 encoded string literal \a sourceText for delayed
translation in the current context (class).
The macro tells lupdate to collect the string, and expands to
\a sourceText itself.
Example:
\snippet code/src_corelib_global_qglobal.cpp 34
The macro QT_TR_NOOP_UTF8() is identical and obsolete; this applies
to all other _UTF8 macros as well.
\sa QT_TRANSLATE_NOOP(), {Internationalization with Qt}
*/
/*!
\macro QT_TRANSLATE_NOOP(context, sourceText)
\relates <QtGlobal>
Marks the UTF-8 encoded string literal \a sourceText for delayed
translation in the given \a context. The \a context is typically
a class name and also needs to be specified as a string literal.
The macro tells lupdate to collect the string, and expands to
\a sourceText itself.
Example:
\snippet code/src_corelib_global_qglobal.cpp 35
\sa QT_TR_NOOP(), QT_TRANSLATE_NOOP3(), {Internationalization with Qt}
*/
/*!
\macro QT_TRANSLATE_NOOP3(context, sourceText, disambiguation)
\relates <QtGlobal>
\since 4.4
Marks the UTF-8 encoded string literal \a sourceText for delayed
translation in the given \a context with the given \a disambiguation.
The \a context is typically a class and also needs to be specified
as a string literal. The string literal \a disambiguation should be
a short semantic tag to tell apart otherwise identical strings.
The macro tells lupdate to collect the string, and expands to an
anonymous struct of the two string literals passed as \a sourceText
and \a disambiguation.
Example:
\snippet code/src_corelib_global_qglobal.cpp 36
\sa QT_TR_NOOP(), QT_TRANSLATE_NOOP(), {Internationalization with Qt}
*/
/*!
\macro QT_TR_N_NOOP(sourceText)
\relates <QtGlobal>
\since 5.12
Marks the UTF-8 encoded string literal \a sourceText for numerator
dependent delayed translation in the current context (class).
The macro tells lupdate to collect the string, and expands to
\a sourceText itself.
The macro expands to \a sourceText.
Example:
\snippet code/src_corelib_global_qglobal.cpp qttrnnoop
\sa QT_TR_NOOP, {Internationalization with Qt}
*/
/*!
\macro QT_TRANSLATE_N_NOOP(context, sourceText)
\relates <QtGlobal>
\since 5.12
Marks the UTF-8 encoded string literal \a sourceText for numerator
dependent delayed translation in the given \a context.
The \a context is typically a class name and also needs to be
specified as a string literal.
The macro tells lupdate to collect the string, and expands to
\a sourceText itself.
Example:
\snippet code/src_corelib_global_qglobal.cpp qttranslatennoop
\sa QT_TRANSLATE_NOOP(), QT_TRANSLATE_N_NOOP3(),
{Internationalization with Qt}
*/
/*!
\macro QT_TRANSLATE_N_NOOP3(context, sourceText, comment)
\relates <QtGlobal>
\since 5.12
Marks the UTF-8 encoded string literal \a sourceText for numerator
dependent delayed translation in the given \a context with the given
\a comment.
The \a context is typically a class and also needs to be specified
as a string literal. The string literal \a comment should be
a short semantic tag to tell apart otherwise identical strings.
The macro tells lupdate to collect the string, and expands to an
anonymous struct of the two string literals passed as \a sourceText
and \a comment.
Example:
\snippet code/src_corelib_global_qglobal.cpp qttranslatennoop3
\sa QT_TR_NOOP(), QT_TRANSLATE_NOOP(), QT_TRANSLATE_NOOP3(),
{Internationalization with Qt}
*/
/*!
\fn QString qtTrId(const char *id, int n = -1)
\relates <QtGlobal>
\reentrant
\since 4.6
\brief The qtTrId function finds and returns a translated string.
Returns a translated string identified by \a id.
If no matching string is found, the id itself is returned. This
should not happen under normal conditions.
If \a n >= 0, all occurrences of \c %n in the resulting string
are replaced with a decimal representation of \a n. In addition,
depending on \a n's value, the translation text may vary.
Meta data and comments can be passed as documented for QObject::tr().
In addition, it is possible to supply a source string template like that:
\tt{//% <C string>}
or
\tt{\\begincomment% <C string> \\endcomment}
Example:
\snippet code/src_corelib_global_qglobal.cpp qttrid
Creating QM files suitable for use with this function requires passing
the \c -idbased option to the \c lrelease tool.
\warning This method is reentrant only if all translators are
installed \e before calling this method. Installing or removing
translators while performing translations is not supported. Doing
so will probably result in crashes or other undesirable behavior.
\sa QObject::tr(), QCoreApplication::translate(), {Internationalization with Qt}
*/
/*!
\macro QT_TRID_NOOP(id)
\relates <QtGlobal>
\since 4.6
\brief The QT_TRID_NOOP macro marks an id for dynamic translation.
The only purpose of this macro is to provide an anchor for attaching
meta data like to qtTrId().
The macro expands to \a id.
Example:
\snippet code/src_corelib_global_qglobal.cpp qttrid_noop
\sa qtTrId(), {Internationalization with Qt}
*/
/*!
\macro Q_LIKELY(expr)
\relates <QtGlobal>
\since 4.8
\brief Hints to the compiler that the enclosed condition, \a expr, is
likely to evaluate to \c true.
Use of this macro can help the compiler to optimize the code.
Example:
\snippet code/src_corelib_global_qglobal.cpp qlikely
\sa Q_UNLIKELY()
*/
/*!
\macro Q_UNLIKELY(expr)
\relates <QtGlobal>
\since 4.8
\brief Hints to the compiler that the enclosed condition, \a expr, is
likely to evaluate to \c false.
Use of this macro can help the compiler to optimize the code.
Example:
\snippet code/src_corelib_global_qglobal.cpp qunlikely
\sa Q_LIKELY()
*/
/*!
\macro QT_POINTER_SIZE
\relates <QtGlobal>
Expands to the size of a pointer in bytes (4 or 8). This is
equivalent to \c sizeof(void *) but can be used in a preprocessor
directive.
*/
/*!
\macro const char *qPrintable(const QString &str)
\relates <QtGlobal>
Returns \a str as a \c{const char *}. This is equivalent to
\a{str}.toLocal8Bit().constData().
The char pointer will be invalid after the statement in which
qPrintable() is used. This is because the array returned by
QString::toLocal8Bit() will fall out of scope.
\note qDebug(), qInfo(), qWarning(), qCritical(), qFatal() expect
%s arguments to be UTF-8 encoded, while qPrintable() converts to
local 8-bit encoding. Therefore qUtf8Printable() should be used
for logging strings instead of qPrintable().
\sa qUtf8Printable()
*/
/*!
\macro const char *qUtf8Printable(const QString &str)
\relates <QtGlobal>
\since 5.4
Returns \a str as a \c{const char *}. This is equivalent to
\a{str}.toUtf8().constData().
The char pointer will be invalid after the statement in which
qUtf8Printable() is used. This is because the array returned by
QString::toUtf8() will fall out of scope.
Example:
\snippet code/src_corelib_global_qglobal.cpp 37
\sa qPrintable(), qDebug(), qInfo(), qWarning(), qCritical(), qFatal()
*/
/*!
\macro const wchar_t *qUtf16Printable(const QString &str)
\relates <QtGlobal>
\since 5.7
Returns \a str as a \c{const ushort *}, but cast to a \c{const wchar_t *}
to avoid warnings. This is equivalent to \a{str}.utf16() plus some casting.
The only useful thing you can do with the return value of this macro is to
pass it to QString::asprintf() for use in a \c{%ls} conversion. In particular,
the return value is \e{not} a valid \c{const wchar_t*}!
In general, the pointer will be invalid after the statement in which
qUtf16Printable() is used. This is because the pointer may have been
obtained from a temporary expression, which will fall out of scope.
Example:
\snippet code/src_corelib_global_qglobal.cpp qUtf16Printable
\sa qPrintable(), qDebug(), qInfo(), qWarning(), qCritical(), qFatal()
*/
/*!
\macro Q_DECLARE_TYPEINFO(Type, Flags)
\relates <QtGlobal>
You can use this macro to specify information about a custom type
\a Type. With accurate type information, Qt's \l{Container Classes}
{generic containers} can choose appropriate storage methods and
algorithms.
\a Flags can be one of the following:
\list
\li \c Q_PRIMITIVE_TYPE specifies that \a Type is a POD (plain old
data) type with no constructor or destructor, or else a type where
every bit pattern is a valid object and memcpy() creates a valid
independent copy of the object.
\li \c Q_MOVABLE_TYPE specifies that \a Type has a constructor
and/or a destructor but can be moved in memory using \c
memcpy(). Note: despite the name, this has nothing to do with move
constructors or C++ move semantics.
\li \c Q_COMPLEX_TYPE (the default) specifies that \a Type has
constructors and/or a destructor and that it may not be moved
in memory.
\endlist
Example of a "primitive" type:
\snippet code/src_corelib_global_qglobal.cpp 38
An example of a non-POD "primitive" type is QUuid: Even though
QUuid has constructors (and therefore isn't POD), every bit
pattern still represents a valid object, and memcpy() can be used
to create a valid independent copy of a QUuid object.
Example of a movable type:
\snippet code/src_corelib_global_qglobal.cpp 39
Qt will try to detect the class of a type using std::is_trivial or
std::is_trivially_copyable. Use this macro to tune the behavior.
For instance many types would be candidates for Q_MOVABLE_TYPE despite
not being trivially-copyable. For binary compatibility reasons, QList
optimizations are only enabled if there is an explicit
Q_DECLARE_TYPEINFO even for trivially-copyable types.
*/
/*!
\macro Q_UNUSED(name)
\relates <QtGlobal>
Indicates to the compiler that the parameter with the specified
\a name is not used in the body of a function. This can be used to
suppress compiler warnings while allowing functions to be defined
with meaningful parameter names in their signatures.
*/
struct QInternal_CallBackTable {
QVector<QList<qInternalCallback> > callbacks;
};
Q_GLOBAL_STATIC(QInternal_CallBackTable, global_callback_table)
bool QInternal::registerCallback(Callback cb, qInternalCallback callback)
{
if (unsigned(cb) < unsigned(QInternal::LastCallback)) {
QInternal_CallBackTable *cbt = global_callback_table();
cbt->callbacks.resize(cb + 1);
cbt->callbacks[cb].append(callback);
return true;
}
return false;
}
bool QInternal::unregisterCallback(Callback cb, qInternalCallback callback)
{
if (unsigned(cb) < unsigned(QInternal::LastCallback)) {
if (global_callback_table.exists()) {
QInternal_CallBackTable *cbt = global_callback_table();
return (bool) cbt->callbacks[cb].removeAll(callback);
}
}
return false;
}
bool QInternal::activateCallbacks(Callback cb, void **parameters)
{
Q_ASSERT_X(cb >= 0, "QInternal::activateCallback()", "Callback id must be a valid id");
if (!global_callback_table.exists())
return false;
QInternal_CallBackTable *cbt = &(*global_callback_table);
if (cbt && cb < cbt->callbacks.size()) {
QList<qInternalCallback> callbacks = cbt->callbacks[cb];
bool ret = false;
for (int i=0; i<callbacks.size(); ++i)
ret |= (callbacks.at(i))(parameters);
return ret;
}
return false;
}
/*!
\macro Q_BYTE_ORDER
\relates <QtGlobal>
This macro can be used to determine the byte order your system
uses for storing data in memory. i.e., whether your system is
little-endian or big-endian. It is set by Qt to one of the macros
Q_LITTLE_ENDIAN or Q_BIG_ENDIAN. You normally won't need to worry
about endian-ness, but you might, for example if you need to know
which byte of an integer or UTF-16 character is stored in the
lowest address. Endian-ness is important in networking, where
computers with different values for Q_BYTE_ORDER must pass data
back and forth.
Use this macro as in the following examples.
\snippet code/src_corelib_global_qglobal.cpp 40
\sa Q_BIG_ENDIAN, Q_LITTLE_ENDIAN
*/
/*!
\macro Q_LITTLE_ENDIAN
\relates <QtGlobal>
This macro represents a value you can compare to the macro
Q_BYTE_ORDER to determine the endian-ness of your system. In a
little-endian system, the least significant byte is stored at the
lowest address. The other bytes follow in increasing order of
significance.
\snippet code/src_corelib_global_qglobal.cpp 41
\sa Q_BYTE_ORDER, Q_BIG_ENDIAN
*/
/*!
\macro Q_BIG_ENDIAN
\relates <QtGlobal>
This macro represents a value you can compare to the macro
Q_BYTE_ORDER to determine the endian-ness of your system. In a
big-endian system, the most significant byte is stored at the
lowest address. The other bytes follow in decreasing order of
significance.
\snippet code/src_corelib_global_qglobal.cpp 42
\sa Q_BYTE_ORDER, Q_LITTLE_ENDIAN
*/
/*!
\macro QT_NAMESPACE
\internal
If this macro is defined to \c ns all Qt classes are put in a namespace
called \c ns. Also, moc will output code putting metaobjects etc.
into namespace \c ns.
\sa QT_BEGIN_NAMESPACE, QT_END_NAMESPACE,
QT_PREPEND_NAMESPACE, QT_USE_NAMESPACE,
QT_BEGIN_INCLUDE_NAMESPACE, QT_END_INCLUDE_NAMESPACE,
QT_BEGIN_MOC_NAMESPACE, QT_END_MOC_NAMESPACE,
*/
/*!
\macro QT_PREPEND_NAMESPACE(identifier)
\internal
This macro qualifies \a identifier with the full namespace.
It expands to \c{::QT_NAMESPACE::identifier} if \c QT_NAMESPACE is defined
and only \a identifier otherwise.
\sa QT_NAMESPACE
*/
/*!
\macro QT_USE_NAMESPACE
\internal
This macro expands to using QT_NAMESPACE if QT_NAMESPACE is defined
and nothing otherwise.
\sa QT_NAMESPACE
*/
/*!
\macro QT_BEGIN_NAMESPACE
\internal
This macro expands to
\snippet code/src_corelib_global_qglobal.cpp begin namespace macro
if \c QT_NAMESPACE is defined and nothing otherwise. If should always
appear in the file-level scope and be followed by \c QT_END_NAMESPACE
at the same logical level with respect to preprocessor conditionals
in the same file.
As a rule of thumb, \c QT_BEGIN_NAMESPACE should appear in all Qt header
and Qt source files after the last \c{#include} line and before the first
declaration.
If that rule can't be followed because, e.g., \c{#include} lines and
declarations are wildly mixed, place \c QT_BEGIN_NAMESPACE before
the first declaration and wrap the \c{#include} lines in
\c QT_BEGIN_INCLUDE_NAMESPACE and \c QT_END_INCLUDE_NAMESPACE.
When using the \c QT_NAMESPACE feature in user code
(e.g., when building plugins statically linked to Qt) where
the user code is not intended to go into the \c QT_NAMESPACE
namespace, all forward declarations of Qt classes need to
be wrapped in \c QT_BEGIN_NAMESPACE and \c QT_END_NAMESPACE.
After that, a \c QT_USE_NAMESPACE should follow.
No further changes should be needed.
\sa QT_NAMESPACE
*/
/*!
\macro QT_END_NAMESPACE
\internal
This macro expands to
\snippet code/src_corelib_global_qglobal.cpp end namespace macro
if \c QT_NAMESPACE is defined and nothing otherwise. It is used to cancel
the effect of \c QT_BEGIN_NAMESPACE.
If a source file ends with a \c{#include} directive that includes a moc file,
\c QT_END_NAMESPACE should be placed before that \c{#include}.
\sa QT_NAMESPACE
*/
/*!
\macro QT_BEGIN_INCLUDE_NAMESPACE
\internal
This macro is equivalent to \c QT_END_NAMESPACE.
It only serves as syntactic sugar and is intended
to be used before #include lines within a
\c QT_BEGIN_NAMESPACE ... \c QT_END_NAMESPACE block.
\sa QT_NAMESPACE
*/
/*!
\macro QT_END_INCLUDE_NAMESPACE
\internal
This macro is equivalent to \c QT_BEGIN_NAMESPACE.
It only serves as syntactic sugar and is intended
to be used after #include lines within a
\c QT_BEGIN_NAMESPACE ... \c QT_END_NAMESPACE block.
\sa QT_NAMESPACE
*/
/*!
\macro QT_BEGIN_MOC_NAMESPACE
\internal
This macro is output by moc at the beginning of
moc files. It is equivalent to \c QT_USE_NAMESPACE.
\sa QT_NAMESPACE
*/
/*!
\macro QT_END_MOC_NAMESPACE
\internal
This macro is output by moc at the beginning of
moc files. It expands to nothing.
\sa QT_NAMESPACE
*/
/*!
\fn bool qFuzzyCompare(double p1, double p2)
\relates <QtGlobal>
\since 4.4
\threadsafe
Compares the floating point value \a p1 and \a p2 and
returns \c true if they are considered equal, otherwise \c false.
Note that comparing values where either \a p1 or \a p2 is 0.0 will not work,
nor does comparing values where one of the values is NaN or infinity.
If one of the values is always 0.0, use qFuzzyIsNull instead. If one of the
values is likely to be 0.0, one solution is to add 1.0 to both values.
\snippet code/src_corelib_global_qglobal.cpp 46
The two numbers are compared in a relative way, where the
exactness is stronger the smaller the numbers are.
*/
/*!
\fn bool qFuzzyCompare(float p1, float p2)
\relates <QtGlobal>
\since 4.4
\threadsafe
Compares the floating point value \a p1 and \a p2 and
returns \c true if they are considered equal, otherwise \c false.
The two numbers are compared in a relative way, where the
exactness is stronger the smaller the numbers are.
*/
/*!
\fn bool qFuzzyIsNull(double d)
\relates <QtGlobal>
\since 4.4
\threadsafe
Returns true if the absolute value of \a d is within 0.000000000001 of 0.0.
*/
/*!
\fn bool qFuzzyIsNull(float f)
\relates <QtGlobal>
\since 4.4
\threadsafe
Returns true if the absolute value of \a f is within 0.00001f of 0.0.
*/
/*!
\macro QT_REQUIRE_VERSION(int argc, char **argv, const char *version)
\relates <QtGlobal>
This macro can be used to ensure that the application is run
against a recent enough version of Qt. This is especially useful
if your application depends on a specific bug fix introduced in a
bug-fix release (e.g., 4.0.2).
The \a argc and \a argv parameters are the \c main() function's
\c argc and \c argv parameters. The \a version parameter is a
string literal that specifies which version of Qt the application
requires (e.g., "4.0.2").
Example:
\snippet code/src_gui_dialogs_qmessagebox.cpp 4
*/
/*!
\macro Q_DECL_EXPORT
\relates <QtGlobal>
This macro marks a symbol for shared library export (see
\l{sharedlibrary.html}{Creating Shared Libraries}).
\sa Q_DECL_IMPORT
*/
/*!
\macro Q_DECL_IMPORT
\relates <QtGlobal>
This macro declares a symbol to be an import from a shared library (see
\l{sharedlibrary.html}{Creating Shared Libraries}).
\sa Q_DECL_EXPORT
*/
/*!
\macro Q_DECL_CONSTEXPR
\relates <QtGlobal>
This macro can be used to declare variable that should be constructed at compile-time,
or an inline function that can be computed at compile-time.
It expands to "constexpr" if your compiler supports that C++11 keyword, or to nothing
otherwise.
\sa Q_DECL_RELAXED_CONSTEXPR
*/
/*!
\macro Q_DECL_RELAXED_CONSTEXPR
\relates <QtGlobal>
This macro can be used to declare an inline function that can be computed
at compile-time according to the relaxed rules from C++14.
It expands to "constexpr" if your compiler supports C++14 relaxed constant
expressions, or to nothing otherwise.
\sa Q_DECL_CONSTEXPR
*/
/*!
\macro qDebug(const char *message, ...)
\relates <QtGlobal>
\threadsafe
Calls the message handler with the debug message \a message. If no
message handler has been installed, the message is printed to
stderr. Under Windows the message is sent to the console, if it is a
console application; otherwise, it is sent to the debugger. On QNX, the
message is sent to slogger2. This function does nothing if \c QT_NO_DEBUG_OUTPUT
was defined during compilation.
If you pass the function a format string and a list of arguments,
it works in similar way to the C printf() function. The format
should be a Latin-1 string.
Example:
\snippet code/src_corelib_global_qglobal.cpp 24
If you include \c <QtDebug>, a more convenient syntax is also
available:
\snippet code/src_corelib_global_qglobal.cpp 25
With this syntax, the function returns a QDebug object that is
configured to use the QtDebugMsg message type. It automatically
puts a single space between each item, and outputs a newline at
the end. It supports many C++ and Qt types.
To suppress the output at run-time, install your own message handler
with qInstallMessageHandler().
\sa qInfo(), qWarning(), qCritical(), qFatal(), qInstallMessageHandler(),
{Debugging Techniques}
*/
/*!
\macro qInfo(const char *message, ...)
\relates <QtGlobal>
\threadsafe
\since 5.5
Calls the message handler with the informational message \a message. If no
message handler has been installed, the message is printed to
stderr. Under Windows, the message is sent to the console, if it is a
console application; otherwise, it is sent to the debugger. On QNX the
message is sent to slogger2. This function does nothing if \c QT_NO_INFO_OUTPUT
was defined during compilation.
If you pass the function a format string and a list of arguments,
it works in similar way to the C printf() function. The format
should be a Latin-1 string.
Example:
\snippet code/src_corelib_global_qglobal.cpp qInfo_printf
If you include \c <QtDebug>, a more convenient syntax is also
available:
\snippet code/src_corelib_global_qglobal.cpp qInfo_stream
With this syntax, the function returns a QDebug object that is
configured to use the QtInfoMsg message type. It automatically
puts a single space between each item, and outputs a newline at
the end. It supports many C++ and Qt types.
To suppress the output at run-time, install your own message handler
with qInstallMessageHandler().
\sa qDebug(), qWarning(), qCritical(), qFatal(), qInstallMessageHandler(),
{Debugging Techniques}
*/
/*!
\macro qWarning(const char *message, ...)
\relates <QtGlobal>
\threadsafe
Calls the message handler with the warning message \a message. If no
message handler has been installed, the message is printed to
stderr. Under Windows, the message is sent to the debugger.
On QNX the message is sent to slogger2. This
function does nothing if \c QT_NO_WARNING_OUTPUT was defined
during compilation; it exits if at the nth warning corresponding to the
counter in environment variable \c QT_FATAL_WARNINGS. That is, if the
environment variable contains the value 1, it will exit on the 1st message;
if it contains the value 10, it will exit on the 10th message. Any
non-numeric value is equivalent to 1.
This function takes a format string and a list of arguments,
similar to the C printf() function. The format should be a Latin-1
string.
Example:
\snippet code/src_corelib_global_qglobal.cpp 26
If you include <QtDebug>, a more convenient syntax is
also available:
\snippet code/src_corelib_global_qglobal.cpp 27
This syntax inserts a space between each item, and
appends a newline at the end.
To suppress the output at runtime, install your own message handler
with qInstallMessageHandler().
\sa qDebug(), qInfo(), qCritical(), qFatal(), qInstallMessageHandler(),
{Debugging Techniques}
*/
/*!
\macro qCritical(const char *message, ...)
\relates <QtGlobal>
\threadsafe
Calls the message handler with the critical message \a message. If no
message handler has been installed, the message is printed to
stderr. Under Windows, the message is sent to the debugger.
On QNX the message is sent to slogger2.
It exits if the environment variable QT_FATAL_CRITICALS is not empty.
This function takes a format string and a list of arguments,
similar to the C printf() function. The format should be a Latin-1
string.
Example:
\snippet code/src_corelib_global_qglobal.cpp 28
If you include <QtDebug>, a more convenient syntax is
also available:
\snippet code/src_corelib_global_qglobal.cpp 29
A space is inserted between the items, and a newline is
appended at the end.
To suppress the output at runtime, install your own message handler
with qInstallMessageHandler().
\sa qDebug(), qInfo(), qWarning(), qFatal(), qInstallMessageHandler(),
{Debugging Techniques}
*/
/*!
\macro qFatal(const char *message, ...)
\relates <QtGlobal>
Calls the message handler with the fatal message \a message. If no
message handler has been installed, the message is printed to
stderr. Under Windows, the message is sent to the debugger.
On QNX the message is sent to slogger2.
If you are using the \b{default message handler} this function will
abort to create a core dump. On Windows, for debug builds,
this function will report a _CRT_ERROR enabling you to connect a debugger
to the application.
This function takes a format string and a list of arguments,
similar to the C printf() function.
Example:
\snippet code/src_corelib_global_qglobal.cpp 30
To suppress the output at runtime, install your own message handler
with qInstallMessageHandler().
\sa qDebug(), qInfo(), qWarning(), qCritical(), qInstallMessageHandler(),
{Debugging Techniques}
*/
/*!
\macro qMove(x)
\relates <QtGlobal>
It expands to "std::move" if your compiler supports that C++11 function, or to nothing
otherwise.
qMove takes an rvalue reference to its parameter \a x, and converts it to an xvalue.
*/
/*!
\macro Q_DECL_NOTHROW
\relates <QtGlobal>
\since 5.0
This macro marks a function as never throwing, under no
circumstances. If the function does nevertheless throw, the
behaviour is undefined.
The macro expands to either "throw()", if that has some benefit on
the compiler, or to C++11 noexcept, if available, or to nothing
otherwise.
If you need C++11 noexcept semantics, don't use this macro, use
Q_DECL_NOEXCEPT/Q_DECL_NOEXCEPT_EXPR instead.
\sa Q_DECL_NOEXCEPT, Q_DECL_NOEXCEPT_EXPR()
*/
/*!
\macro QT_TERMINATE_ON_EXCEPTION(expr)
\relates <QtGlobal>
\internal
In general, use of the Q_DECL_NOEXCEPT macro is preferred over
Q_DECL_NOTHROW, because it exhibits well-defined behavior and
supports the more powerful Q_DECL_NOEXCEPT_EXPR variant. However,
use of Q_DECL_NOTHROW has the advantage that Windows builds
benefit on a wide range or compiler versions that do not yet
support the C++11 noexcept feature.
It may therefore be beneficial to use Q_DECL_NOTHROW and emulate
the C++11 behavior manually with an embedded try/catch.
Qt provides the QT_TERMINATE_ON_EXCEPTION(expr) macro for this
purpose. It either expands to \c expr (if Qt is compiled without
exception support or the compiler supports C++11 noexcept
semantics) or to
\snippet code/src_corelib_global_qglobal.cpp qterminate
otherwise.
Since this macro expands to just \c expr if the compiler supports
C++11 noexcept, expecting the compiler to take over responsibility
of calling std::terminate() in that case, it should not be used
outside Q_DECL_NOTHROW functions.
\sa Q_DECL_NOEXCEPT, Q_DECL_NOTHROW, qTerminate()
*/
/*!
\macro Q_DECL_NOEXCEPT
\relates <QtGlobal>
\since 5.0
This macro marks a function as never throwing. If the function
does nevertheless throw, the behaviour is defined:
std::terminate() is called.
The macro expands to C++11 noexcept, if available, or to nothing
otherwise.
If you need the operator version of C++11 noexcept, use
Q_DECL_NOEXCEPT_EXPR(x).
If you don't need C++11 noexcept semantics, e.g. because your
function can't possibly throw, don't use this macro, use
Q_DECL_NOTHROW instead.
\sa Q_DECL_NOTHROW, Q_DECL_NOEXCEPT_EXPR()
*/
/*!
\macro Q_DECL_NOEXCEPT_EXPR(x)
\relates <QtGlobal>
\since 5.0
This macro marks a function as non-throwing if \a x is \c true. If
the function does nevertheless throw, the behaviour is defined:
std::terminate() is called.
The macro expands to C++11 noexcept(x), if available, or to
nothing otherwise.
If you need the always-true version of C++11 noexcept, use
Q_DECL_NOEXCEPT.
If you don't need C++11 noexcept semantics, e.g. because your
function can't possibly throw, don't use this macro, use
Q_DECL_NOTHROW instead.
\sa Q_DECL_NOTHROW, Q_DECL_NOEXCEPT
*/
/*!
\macro Q_DECL_OVERRIDE
\since 5.0
\relates <QtGlobal>
This macro can be used to declare an overriding virtual
function. Use of this markup will allow the compiler to generate
an error if the overriding virtual function does not in fact
override anything.
It expands to "override" if your compiler supports that C++11
contextual keyword, or to nothing otherwise.
The macro goes at the end of the function, usually after the
\c{const}, if any:
\snippet code/src_corelib_global_qglobal.cpp qdecloverride
\sa Q_DECL_FINAL
*/
/*!
\macro Q_DECL_FINAL
\since 5.0
\relates <QtGlobal>
This macro can be used to declare an overriding virtual or a class
as "final", with Java semantics. Further-derived classes can then
no longer override this virtual function, or inherit from this
class, respectively.
It expands to "final" if your compiler supports that C++11
contextual keyword, or something non-standard if your compiler
supports something close enough to the C++11 semantics, or to
nothing otherwise.
The macro goes at the end of the function, usually after the
\c{const}, if any:
\snippet code/src_corelib_global_qglobal.cpp qdeclfinal-1
For classes, it goes in front of the \c{:} in the class
definition, if any:
\snippet code/src_corelib_global_qglobal.cpp qdeclfinal-2
\sa Q_DECL_OVERRIDE
*/
/*!
\macro Q_FORWARD_DECLARE_OBJC_CLASS(classname)
\since 5.2
\relates <QtGlobal>
Forward-declares an Objective-C \a classname in a manner such that it can be
compiled as either Objective-C or C++.
This is primarily intended for use in header files that may be included by
both Objective-C and C++ source files.
*/
/*!
\macro Q_FORWARD_DECLARE_CF_TYPE(type)
\since 5.2
\relates <QtGlobal>
Forward-declares a Core Foundation \a type. This includes the actual
type and the ref type. For example, Q_FORWARD_DECLARE_CF_TYPE(CFString)
declares __CFString and CFStringRef.
*/
/*!
\macro Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(type)
\since 5.2
\relates <QtGlobal>
Forward-declares a mutable Core Foundation \a type. This includes the actual
type and the ref type. For example, Q_FORWARD_DECLARE_MUTABLE_CF_TYPE(CFMutableString)
declares __CFMutableString and CFMutableStringRef.
*/
QT_END_NAMESPACE