// Copyright (c) 2009 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 CHROME_BROWSER_SYNC_UTIL_DBGQ_H_ #define CHROME_BROWSER_SYNC_UTIL_DBGQ_H_ #pragma once #include "base/basictypes.h" // for COMPILE_ASSERT // A circular queue that is designed to be easily inspectable in a debugger. It // puts the elements into the array in reverse, so you can just look at the i_ // pointer for a recent history. template <typename T, size_t size> class DebugQueue { COMPILE_ASSERT(size > 0, DebugQueue_size_must_be_greater_than_zero); public: DebugQueue() : i_(array_) { } void Push(const T& t) { i_ = (array_ == i_ ? array_ + size - 1 : i_ - 1); *i_ = t; } protected: T* i_; // Points to the newest element in the queue. T array_[size]; }; #endif // CHROME_BROWSER_SYNC_UTIL_DBGQ_H_