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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/memory/ref_counted.h"
// See comments for the similar block in thread_checker.h.
#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
#define ENABLE_SEQUENCE_CHECKER 1
#else
#define ENABLE_SEQUENCE_CHECKER 0
#endif
#if ENABLE_SEQUENCE_CHECKER
#include "base/sequence_checker_impl.h"
#endif
namespace base {
class SequencedTaskRunner;
// 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 CalledOnValidSequencedThread() const {
return true;
}
void DetachFromSequence() {}
};
// SequenceChecker is a helper class used to help verify that some
// methods of a class are called in sequence -- that is, called from
// the same SequencedTaskRunner. It is a generalization of
// ThreadChecker; see comments in sequence_checker_impl.h for details.
//
// Example:
// class MyClass {
// public:
// void Foo() {
// DCHECK(sequence_checker_.CalledOnValidSequencedThread());
// ... (do stuff) ...
// }
//
// private:
// SequenceChecker sequence_checker_;
// }
//
// In Release mode, CalledOnValidSequence will always return true.
#if ENABLE_SEQUENCE_CHECKER
class SequenceChecker : public SequenceCheckerImpl {
};
#else
class SequenceChecker : public SequenceCheckerDoNothing {
};
#endif // ENABLE_SEQUENCE_CHECKER
#undef ENABLE_SEQUENCE_CHECKER
} // namespace base
#endif // BASE_SEQUENCE_CHECKER_H_
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