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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_SYNC_UTIL_FAST_DUMP_H_
#define CHROME_BROWSER_SYNC_UTIL_FAST_DUMP_H_
#include <ostream>
#include <streambuf>
#include <string>
#include "base/string_util.h"
using std::ostream;
using std::streambuf;
using std::string;
// This seems totally gratuitous, and it would be if std::ostream was fast, but
// std::ostream is slow. It's slow because it creates a ostream::sentry (mutex)
// for every little << operator. When you want to dump a whole lot of stuff
// under a single mutex lock, use this FastDump class.
namespace browser_sync {
class FastDump {
public:
explicit FastDump(ostream* outs) : sentry_(*outs), out_(outs->rdbuf()) {
}
ostream::sentry sentry_;
streambuf* const out_;
};
} // namespace browser_sync
inline browser_sync::FastDump& operator <<
(browser_sync::FastDump& dump, int64 n) {
string numbuf(Int64ToString(n));
const char* number = numbuf.c_str();
dump.out_->sputn(number, numbuf.length());
return dump;
}
inline browser_sync::FastDump& operator <<
(browser_sync::FastDump& dump, int32 n) {
string numbuf(IntToString(n));
const char* number = numbuf.c_str();
dump.out_->sputn(number, numbuf.length());
return dump;
}
inline browser_sync::FastDump& operator <<
(browser_sync::FastDump& dump, const char* s) {
dump.out_->sputn(s, strlen(s));
return dump;
}
inline browser_sync::FastDump& operator <<
(browser_sync::FastDump& dump, const string& s) {
dump.out_->sputn(s.data(), s.size());
return dump;
}
#endif // CHROME_BROWSER_SYNC_UTIL_FAST_DUMP_H_
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