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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.
#ifndef BASE_SEQUENCE_CHECKER_H_
#define BASE_SEQUENCE_CHECKER_H_
#include "base/sequence_checker_impl.h"
namespace base {
// Do nothing implementation, for use in release mode.
//
// Note: You should almost always use the SequenceChecker class to get
// the right version for your build configuration.
class SequenceCheckerDoNothing {
public:
bool CalledOnValidSequence() const { return true; }
void DetachFromSequence() {}
};
// SequenceChecker is a helper class to verify that calls to some methods of a
// class are sequenced. Calls are sequenced when they are issued:
// - From tasks posted to SequencedTaskRunners or SingleThreadTaskRunners bound
// to the same sequence, or,
// - From a single thread outside of any task.
//
// Example:
// class MyClass {
// public:
// void Foo() {
// DCHECK(sequence_checker_.CalledOnValidSequence());
// ... (do stuff) ...
// }
//
// private:
// SequenceChecker sequence_checker_;
// }
//
// In Release mode, CalledOnValidSequence() will always return true.
#if DCHECK_IS_ON()
class SequenceChecker : public SequenceCheckerImpl {
};
#else
class SequenceChecker : public SequenceCheckerDoNothing {
};
#endif // DCHECK_IS_ON()
} // namespace base
#endif // BASE_SEQUENCE_CHECKER_H_
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