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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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55 // Holds the Callback methods that don't require specialization to reduce | 55 // Holds the Callback methods that don't require specialization to reduce |
56 // template bloat. | 56 // template bloat. |
57 // CallbackBase<MoveOnly> is a direct base class of MoveOnly callbacks, and | 57 // CallbackBase<MoveOnly> is a direct base class of MoveOnly callbacks, and |
58 // CallbackBase<Copyable> uses CallbackBase<MoveOnly> for its implementation. | 58 // CallbackBase<Copyable> uses CallbackBase<MoveOnly> for its implementation. |
59 template <> | 59 template <> |
60 class BASE_EXPORT CallbackBase<CopyMode::MoveOnly> { | 60 class BASE_EXPORT CallbackBase<CopyMode::MoveOnly> { |
61 public: | 61 public: |
62 CallbackBase(CallbackBase&& c); | 62 CallbackBase(CallbackBase&& c); |
63 CallbackBase& operator=(CallbackBase&& c); | 63 CallbackBase& operator=(CallbackBase&& c); |
64 | 64 |
| 65 explicit CallbackBase(const CallbackBase<CopyMode::Copyable>& c); |
| 66 CallbackBase& operator=(const CallbackBase<CopyMode::Copyable>& c); |
| 67 |
65 // Returns true if Callback is null (doesn't refer to anything). | 68 // Returns true if Callback is null (doesn't refer to anything). |
66 bool is_null() const { return bind_state_.get() == NULL; } | 69 bool is_null() const { return bind_state_.get() == NULL; } |
67 explicit operator bool() const { return !is_null(); } | 70 explicit operator bool() const { return !is_null(); } |
68 | 71 |
69 // Returns the Callback into an uninitialized state. | 72 // Returns the Callback into an uninitialized state. |
70 void Reset(); | 73 void Reset(); |
71 | 74 |
72 protected: | 75 protected: |
73 // In C++, it is safe to cast function pointers to function pointers of | 76 // In C++, it is safe to cast function pointers to function pointers of |
74 // another type. It is not okay to use void*. We create a InvokeFuncStorage | 77 // another type. It is not okay to use void*. We create a InvokeFuncStorage |
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109 ~CallbackBase() {} | 112 ~CallbackBase() {} |
110 }; | 113 }; |
111 | 114 |
112 extern template class CallbackBase<CopyMode::MoveOnly>; | 115 extern template class CallbackBase<CopyMode::MoveOnly>; |
113 extern template class CallbackBase<CopyMode::Copyable>; | 116 extern template class CallbackBase<CopyMode::Copyable>; |
114 | 117 |
115 } // namespace internal | 118 } // namespace internal |
116 } // namespace base | 119 } // namespace base |
117 | 120 |
118 #endif // BASE_CALLBACK_INTERNAL_H_ | 121 #endif // BASE_CALLBACK_INTERNAL_H_ |
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