sequenced_task_runner_helpers.h 1.14 KB
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// 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.

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#ifndef BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_
#define BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_
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namespace base {

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class SequencedTaskRunner;
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// 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) {
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    delete static_cast<const T*>(object);
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  }

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  friend class SequencedTaskRunner;
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};

template <class T>
class ReleaseHelper {
 private:
  static void DoRelease(const void* object) {
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    static_cast<const T*>(object)->Release();
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  }

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  friend class SequencedTaskRunner;
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};

}  // namespace base

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#endif  // BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_