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