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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // This file contains utility functions and classes that help the | 5 // This file contains utility functions and classes that help the |
6 // implementation, and management of the Callback objects. | 6 // implementation, and management of the Callback objects. |
7 | 7 |
8 #ifndef BASE_CALLBACK_INTERNAL_H_ | 8 #ifndef BASE_CALLBACK_INTERNAL_H_ |
9 #define BASE_CALLBACK_INTERNAL_H_ | 9 #define BASE_CALLBACK_INTERNAL_H_ |
10 | 10 |
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104 // std::unique_ptr. | 104 // std::unique_ptr. |
105 // TODO(dcheng): Revisit this when Windows switches to VS2015 by default. | 105 // TODO(dcheng): Revisit this when Windows switches to VS2015 by default. |
106 template <typename T> struct IsMoveOnlyType { | 106 template <typename T> struct IsMoveOnlyType { |
107 template <typename U> | 107 template <typename U> |
108 static YesType Test(const typename U::MoveOnlyTypeForCPP03*); | 108 static YesType Test(const typename U::MoveOnlyTypeForCPP03*); |
109 | 109 |
110 template <typename U> | 110 template <typename U> |
111 static NoType Test(...); | 111 static NoType Test(...); |
112 | 112 |
113 static const bool value = sizeof((Test<T>(0))) == sizeof(YesType) && | 113 static const bool value = sizeof((Test<T>(0))) == sizeof(YesType) && |
114 !is_const<T>::value; | 114 !std::is_const<T>::value; |
115 }; | 115 }; |
116 | 116 |
117 // Specialization of IsMoveOnlyType so that std::unique_ptr is still considered | 117 // Specialization of IsMoveOnlyType so that std::unique_ptr is still considered |
118 // move-only, even without the sentinel member. | 118 // move-only, even without the sentinel member. |
119 template <typename T, typename D> | 119 template <typename T, typename D> |
120 struct IsMoveOnlyType<std::unique_ptr<T, D>> : std::true_type {}; | 120 struct IsMoveOnlyType<std::unique_ptr<T, D>> : std::true_type {}; |
121 | 121 |
122 // Specialization of std::vector, so that it's considered move-only if the | 122 // Specialization of std::vector, so that it's considered move-only if the |
123 // element type is move-only. Allocator is explicitly ignored when determining | 123 // element type is move-only. Allocator is explicitly ignored when determining |
124 // move-only status of the std::vector. | 124 // move-only status of the std::vector. |
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208 template <typename T> | 208 template <typename T> |
209 typename std::enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward( | 209 typename std::enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward( |
210 T& t) { | 210 T& t) { |
211 return std::move(t); | 211 return std::move(t); |
212 } | 212 } |
213 | 213 |
214 } // namespace internal | 214 } // namespace internal |
215 } // namespace base | 215 } // namespace base |
216 | 216 |
217 #endif // BASE_CALLBACK_INTERNAL_H_ | 217 #endif // BASE_CALLBACK_INTERNAL_H_ |
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