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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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70 // A helper template to determine if given type is non-const move-only-type, | 70 // A helper template to determine if given type is non-const move-only-type, |
71 // i.e. if a value of the given type should be passed via .Pass() in a | 71 // i.e. if a value of the given type should be passed via .Pass() in a |
72 // destructive way. | 72 // destructive way. |
73 template <typename T> struct IsMoveOnlyType { | 73 template <typename T> struct IsMoveOnlyType { |
74 template <typename U> | 74 template <typename U> |
75 static YesType Test(const typename U::MoveOnlyTypeForCPP03*); | 75 static YesType Test(const typename U::MoveOnlyTypeForCPP03*); |
76 | 76 |
77 template <typename U> | 77 template <typename U> |
78 static NoType Test(...); | 78 static NoType Test(...); |
79 | 79 |
80 static const bool value = sizeof(Test<T>(0)) == sizeof(YesType) && | 80 static const bool value = sizeof((Test<T>(0))) == sizeof(YesType) && |
81 !is_const<T>::value; | 81 !is_const<T>::value; |
82 }; | 82 }; |
83 | 83 |
84 // This is a typetraits object that's used to take an argument type, and | 84 // This is a typetraits object that's used to take an argument type, and |
85 // extract a suitable type for storing and forwarding arguments. | 85 // extract a suitable type for storing and forwarding arguments. |
86 // | 86 // |
87 // In particular, it strips off references, and converts arrays to | 87 // In particular, it strips off references, and converts arrays to |
88 // pointers for storage; and it avoids accidentally trying to create a | 88 // pointers for storage; and it avoids accidentally trying to create a |
89 // "reference of a reference" if the argument is a reference type. | 89 // "reference of a reference" if the argument is a reference type. |
90 // | 90 // |
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169 | 169 |
170 template <typename T> | 170 template <typename T> |
171 typename enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward(T& t) { | 171 typename enable_if<IsMoveOnlyType<T>::value, T>::type CallbackForward(T& t) { |
172 return t.Pass(); | 172 return t.Pass(); |
173 } | 173 } |
174 | 174 |
175 } // namespace internal | 175 } // namespace internal |
176 } // namespace base | 176 } // namespace base |
177 | 177 |
178 #endif // BASE_CALLBACK_INTERNAL_H_ | 178 #endif // BASE_CALLBACK_INTERNAL_H_ |
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