| // Copyright 2014 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // This file contains macros and macro-like constructs (e.g., templates) that |
| // are commonly used throughout Chromium source. (It may also contain things |
| // that are closely related to things that are commonly used that belong in this |
| // file.) |
| |
| #ifndef BASE_MACROS_H_ |
| #define BASE_MACROS_H_ |
| |
| // Put this in the declarations for a class to be uncopyable. |
| #define DISALLOW_COPY(TypeName) \ |
| TypeName(const TypeName&) = delete |
| |
| // Put this in the declarations for a class to be unassignable. |
| #define DISALLOW_ASSIGN(TypeName) TypeName& operator=(const TypeName&) = delete |
| |
| // Put this in the declarations for a class to be uncopyable and unassignable. |
| #define DISALLOW_COPY_AND_ASSIGN(TypeName) \ |
| DISALLOW_COPY(TypeName); \ |
| DISALLOW_ASSIGN(TypeName) |
| |
| // A macro to disallow all the implicit constructors, namely the |
| // default constructor, copy constructor and operator= functions. |
| // This is especially useful for classes containing only static methods. |
| #define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \ |
| TypeName() = delete; \ |
| DISALLOW_COPY_AND_ASSIGN(TypeName) |
| |
| // Workaround for MSVC, which expands __VA_ARGS__ as one macro argument. To |
| // work around this bug, wrap the entire expression in this macro... |
| #define CR_EXPAND_ARG(arg) arg |
| |
| // Used to explicitly mark the return value of a function as unused. If you are |
| // really sure you don't want to do anything with the return value of a function |
| // that has been marked WARN_UNUSED_RESULT, wrap it with this. Example: |
| // |
| // std::unique_ptr<MyType> my_var = ...; |
| // if (TakeOwnership(my_var.get()) == SUCCESS) |
| // ignore_result(my_var.release()); |
| // |
| template<typename T> |
| inline void ignore_result(const T&) { |
| } |
| |
| #endif // BASE_MACROS_H_ |
