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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_METRICS_HISTOGRAM_BASE_H_
#define BASE_METRICS_HISTOGRAM_BASE_H_
#include <climits>
#include <string>
#include "base/base_export.h"
namespace base {
class BASE_EXPORT HistogramBase {
public:
typedef int Sample; // Used for samples.
typedef int Count; // Used to count samples.
static const Sample kSampleType_MAX; // INT_MAX
HistogramBase(const std::string& name);
virtual ~HistogramBase();
std::string histogram_name() const { return histogram_name_; }
virtual void Add(Sample value) = 0;
// The following methods provide graphical histogram displays.
virtual void WriteHTMLGraph(std::string* output) const = 0;
virtual void WriteAscii(std::string* output) const = 0;
private:
const std::string histogram_name_;
};
} // namespace base
#endif // BASE_METRICS_HISTOGRAM_BASE_H_
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