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// 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_STATE_TRACKER_H_
#define CHROME_BROWSER_STATE_TRACKER_H_
#include <string>
#include "base/logging.h"
#include "base/scoped_ptr.h"
// StateTracker maintains a circular character buffer. It is intended for use in
// tracking down crashes. As various events occur invoke Append. When you're
// ready to crash, invoke Crash, which copies the state onto
// the state and CHECKs.
// The '!' in the array indicates the position the next character is inserted.
// The string of characters before the '!' gives the most recent strings that
// were appended.
class StateTracker {
public:
StateTracker();
// Appends |text|.
void Append(const std::string& text);
// Copies the appended text onto the stack and CHECKs.
void Crash();
private:
// Current index into the string content is inserted at.
size_t index_;
// The content.
scoped_array<char> content_;
DISALLOW_COPY_AND_ASSIGN(StateTracker);
};
#endif // CHROME_BROWSER_STATE_TRACKER_H_
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