| /**************************************************************************** |
| ** |
| ** Copyright (C) 2018 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtQml 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. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #pragma once |
| |
| #include <QtCore/qglobal.h> |
| #include <QtQml/private/qtqmlglobal_p.h> |
| |
| #include <memory> |
| #if __cplusplus > 201402L && __has_include(<optional>) |
| #include <optional> |
| #else |
| |
| namespace std { |
| |
| struct nullopt_t {}; |
| |
| constexpr nullopt_t nullopt {}; |
| |
| template<typename T> |
| class optional { |
| public: |
| optional() = default; |
| optional(nullopt_t) {} |
| optional(const T &v) : _value(v), _hasValue(true) {} |
| ~optional() = default; |
| |
| optional &operator =(nullopt_t) { |
| _value = T(); |
| _hasValue = false; |
| return *this; |
| } |
| |
| T operator->() { return _value; } |
| T operator*() { return _value; } |
| |
| operator bool() const { return _hasValue; } |
| bool has_value() const { return _hasValue; } |
| |
| T value() const { return _value; } |
| |
| private: |
| T _value = T(); |
| bool _hasValue = false; |
| }; |
| |
| } |
| |
| #endif |
| |
| #if __cplusplus < 201402L && !QT_CONFIG(cxx14_make_unique)\ |
| && !defined(__cpp_lib_make_unique) |
| |
| namespace std { |
| template<typename T, class ...Args> |
| unique_ptr<T> make_unique(Args &&...args) |
| { return unique_ptr<T>(new T(std::forward<Args>(args)...)); } |
| } |
| |
| #endif |