| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_ |
| #define BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_ |
| |
| namespace base { |
| |
| class SequencedTaskRunner; |
| |
| // Template helpers which use function indirection to erase T from the |
| // function signature while still remembering it so we can call the |
| // correct destructor/release function. |
| // |
| // We use this trick so we don't need to include bind.h in a header |
| // file like sequenced_task_runner.h. We also wrap the helpers in a |
| // templated class to make it easier for users of DeleteSoon to |
| // declare the helper as a friend. |
| template <class T> |
| class DeleteHelper { |
| private: |
| static void DoDelete(const void* object) { |
| delete static_cast<const T*>(object); |
| } |
| |
| friend class SequencedTaskRunner; |
| }; |
| |
| template <class T> |
| class ReleaseHelper { |
| private: |
| static void DoRelease(const void* object) { |
| static_cast<const T*>(object)->Release(); |
| } |
| |
| friend class SequencedTaskRunner; |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_ |