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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 #pragma once | 10 #pragma once |
11 | 11 |
| 12 #include "base/base_api.h" |
12 #include "base/ref_counted.h" | 13 #include "base/ref_counted.h" |
13 | 14 |
14 namespace base { | 15 namespace base { |
15 namespace internal { | 16 namespace internal { |
16 | 17 |
17 // InvokerStorageBase is used to provide an opaque handle that the Callback | 18 // InvokerStorageBase is used to provide an opaque handle that the Callback |
18 // class can use to represent a function object with bound arguments. It | 19 // class can use to represent a function object with bound arguments. It |
19 // behaves as an existential type that is used by a corresponding | 20 // behaves as an existential type that is used by a corresponding |
20 // DoInvoke function to perform the function execution. This allows | 21 // DoInvoke function to perform the function execution. This allows |
21 // us to shield the Callback class from the types of the bound argument via | 22 // us to shield the Callback class from the types of the bound argument via |
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44 mutable scoped_refptr<InvokerStorageBase> invoker_storage_; | 45 mutable scoped_refptr<InvokerStorageBase> invoker_storage_; |
45 }; | 46 }; |
46 | 47 |
47 template <typename T> | 48 template <typename T> |
48 InvokerStorageHolder<T> MakeInvokerStorageHolder(T* o) { | 49 InvokerStorageHolder<T> MakeInvokerStorageHolder(T* o) { |
49 return InvokerStorageHolder<T>(o); | 50 return InvokerStorageHolder<T>(o); |
50 } | 51 } |
51 | 52 |
52 // Holds the Callback methods that don't require specialization to reduce | 53 // Holds the Callback methods that don't require specialization to reduce |
53 // template bloat. | 54 // template bloat. |
54 class CallbackBase { | 55 class BASE_API CallbackBase { |
55 public: | 56 public: |
56 // Returns true if Callback is null (doesn't refer to anything). | 57 // Returns true if Callback is null (doesn't refer to anything). |
57 bool is_null() const; | 58 bool is_null() const; |
58 | 59 |
59 // Returns the Callback into an uninitalized state. | 60 // Returns the Callback into an uninitalized state. |
60 void Reset(); | 61 void Reset(); |
61 | 62 |
62 bool Equals(const CallbackBase& other) const; | 63 bool Equals(const CallbackBase& other) const; |
63 | 64 |
64 protected: | 65 protected: |
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77 ~CallbackBase(); | 78 ~CallbackBase(); |
78 | 79 |
79 scoped_refptr<InvokerStorageBase> invoker_storage_; | 80 scoped_refptr<InvokerStorageBase> invoker_storage_; |
80 InvokeFuncStorage polymorphic_invoke_; | 81 InvokeFuncStorage polymorphic_invoke_; |
81 }; | 82 }; |
82 | 83 |
83 } // namespace internal | 84 } // namespace internal |
84 } // namespace base | 85 } // namespace base |
85 | 86 |
86 #endif // BASE_CALLBACK_INTERNAL_H_ | 87 #endif // BASE_CALLBACK_INTERNAL_H_ |
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