1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_SYNC_UTIL_DBGQ_H_ 6 #define CHROME_BROWSER_SYNC_UTIL_DBGQ_H_ 7 #pragma once 8 9 #include "base/basictypes.h" // for COMPILE_ASSERT 10 11 // A circular queue that is designed to be easily inspectable in a debugger. It 12 // puts the elements into the array in reverse, so you can just look at the i_ 13 // pointer for a recent history. 14 template <typename T, size_t size> 15 class DebugQueue { 16 COMPILE_ASSERT(size > 0, DebugQueue_size_must_be_greater_than_zero); 17 public: 18 DebugQueue() : i_(array_) { } 19 void Push(const T& t) { 20 i_ = (array_ == i_ ? array_ + size - 1 : i_ - 1); 21 *i_ = t; 22 } 23 protected: 24 T* i_; // Points to the newest element in the queue. 25 T array_[size]; 26 }; 27 28 #endif // CHROME_BROWSER_SYNC_UTIL_DBGQ_H_ 29
