C++ (windows) でのミリ秒計測ログ埋め込み→クラス化、スレッドアンセーフ

measure_milisec.cpp

#include<iostream>
#include<windows.h> // and link to "winmm.lib"

// code
DWORD startTime, endTime;
startTime = timeGetTime();
// ...
// elaplse target
// ...
endTime1 = timeGetTime();
std::cout << "elaplse time is..." << endTime - startTime << std::endl;

PerformanceLog.cpp

#include "PerformanceLog.h"

#include <iostream>

namespace foo{

PerformanceLog::PerformanceLog(std::string place) : place_(place)
{
 	startTime_ = timeGetTime();
}

PerformanceLog::~PerformanceLog(void)
{
	endTime_ = timeGetTime();
	std::cout << "[" << place_ << "]" << endTime_ - startTime_ << std::endl;
}

} // end of namespace

PerformanceLog.h

#include <string>
#include <windows.h>

namespace foo {

class PerformanceLog
{
public:
 	PerformanceLog(std::string place);
	~PerformanceLog(void);

private:
	DWORD startTime_;
	DWORD endTime_;
	std::string place_;
};

} // end of namespace