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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 defines helpful methods for dealing with Callbacks. Because Callbacks | 5 // This defines helpful methods for dealing with Callbacks. Because Callbacks |
6 // are implemented using templates, with a class per callback signature, adding | 6 // are implemented using templates, with a class per callback signature, adding |
7 // methods to Callback<> itself is unattractive (lots of extra code gets | 7 // methods to Callback<> itself is unattractive (lots of extra code gets |
8 // generated). Instead, consider adding methods here. | 8 // generated). Instead, consider adding methods here. |
9 // | 9 // |
10 // ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a | 10 // ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a |
11 // copy) after the original callback is Reset(). This can be handy if Run() | 11 // copy) after the original callback is Reset(). This can be handy if Run() |
12 // reads/writes the variable holding the Callback. | 12 // reads/writes the variable holding the Callback. |
13 | 13 |
14 #ifndef BASE_CALLBACK_HELPERS_H_ | 14 #ifndef BASE_CALLBACK_HELPERS_H_ |
15 #define BASE_CALLBACK_HELPERS_H_ | 15 #define BASE_CALLBACK_HELPERS_H_ |
16 | 16 |
| 17 #include "base/basictypes.h" |
17 #include "base/callback.h" | 18 #include "base/callback.h" |
| 19 #include "base/compiler_specific.h" |
18 | 20 |
19 namespace base { | 21 namespace base { |
20 | 22 |
21 template <typename Sig> | 23 template <typename Sig> |
22 base::Callback<Sig> ResetAndReturn(base::Callback<Sig>* cb) { | 24 base::Callback<Sig> ResetAndReturn(base::Callback<Sig>* cb) { |
23 base::Callback<Sig> ret(*cb); | 25 base::Callback<Sig> ret(*cb); |
24 cb->Reset(); | 26 cb->Reset(); |
25 return ret; | 27 return ret; |
26 } | 28 } |
27 | 29 |
| 30 // ScopedClosureRunner is akin to scoped_ptr for Closures. It ensures that the |
| 31 // Closure is executed and deleted no matter how the current scope exits. |
| 32 class BASE_EXPORT ScopedClosureRunner { |
| 33 public: |
| 34 ScopedClosureRunner(); |
| 35 explicit ScopedClosureRunner(const Closure& closure); |
| 36 ~ScopedClosureRunner(); |
| 37 |
| 38 void Reset(); |
| 39 void Reset(const Closure& closure); |
| 40 Closure Release() WARN_UNUSED_RESULT; |
| 41 |
| 42 private: |
| 43 Closure closure_; |
| 44 |
| 45 DISALLOW_COPY_AND_ASSIGN(ScopedClosureRunner); |
| 46 }; |
| 47 |
28 } // namespace base | 48 } // namespace base |
29 | 49 |
30 #endif // BASE_CALLBACK_HELPERS_H_ | 50 #endif // BASE_CALLBACK_HELPERS_H_ |
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