1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_MOVE_H_ 6 #define BASE_MOVE_H_ 7 8 #include <utility> 9 10 #include "base/compiler_specific.h" 11 #include "base/macros.h" 12 #include "build/build_config.h" 13 14 // TODO(crbug.com/566182): DEPRECATED! 15 // Use DISALLOW_COPY_AND_ASSIGN instead, or if your type will be used in 16 // Callbacks, use DISALLOW_COPY_AND_ASSIGN_WITH_MOVE_FOR_BIND instead. 17 #define MOVE_ONLY_TYPE_FOR_CPP_03(type) \ 18 DISALLOW_COPY_AND_ASSIGN_WITH_MOVE_FOR_BIND(type) 19 20 // A macro to disallow the copy constructor and copy assignment functions. 21 // This should be used in the private: declarations for a class. 22 // 23 // Use this macro instead of DISALLOW_COPY_AND_ASSIGN if you want to pass 24 // ownership of the type through a base::Callback without heap-allocating it 25 // into a scoped_ptr. The class must define a move constructor and move 26 // assignment operator to make this work. 27 // 28 // This version of the macro adds a Pass() function and a cryptic 29 // MoveOnlyTypeForCPP03 typedef for the base::Callback implementation to use. 30 // See IsMoveOnlyType template and its usage in base/callback_internal.h 31 // for more details. 32 // TODO(crbug.com/566182): Remove this macro and use DISALLOW_COPY_AND_ASSIGN 33 // everywhere instead. 34 #if defined(OS_ANDROID) || defined(OS_LINUX) 35 #define DISALLOW_COPY_AND_ASSIGN_WITH_MOVE_FOR_BIND(type) \ 36 private: \ 37 type(const type&) = delete; \ 38 void operator=(const type&) = delete; \ 39 \ 40 public: \ 41 typedef void MoveOnlyTypeForCPP03; \ 42 \ 43 private: 44 #else 45 #define DISALLOW_COPY_AND_ASSIGN_WITH_MOVE_FOR_BIND(type) \ 46 private: \ 47 type(const type&) = delete; \ 48 void operator=(const type&) = delete; \ 49 \ 50 public: \ 51 type&& Pass() WARN_UNUSED_RESULT { return std::move(*this); } \ 52 typedef void MoveOnlyTypeForCPP03; \ 53 \ 54 private: 55 #endif 56 57 #endif // BASE_MOVE_H_ 58