c++实现计时器Timer

话不多说，直接上干货：
Timer类：

#include <iostream>
#include <chrono>
using namespace std::chrono;
class Timer
{
public:
	Timer() :m_begin(high_resolution_clock::now()){}
	~Timer(){};

	void reset(){ m_begin = high_resolution_clock::now(); }

	//默认输出毫秒
	template<typename Duration = milliseconds>
	int64_t elapsed() const									
	{
		return duration_cast<Duration>(high_resolution_clock::now() - m_begin).count();
	}

	//微妙
	int64_t elapsed_micro()
	{
		return elapsed<microseconds>();
	}

	//微妙
	int64_t elapsed_nano() const
	{
		return elapsed<nanoseconds>();
	}

	//秒
	int64_t elapsed_seconds() const
	{
		return elapsed<seconds>();
	}

	//分钟
	int64_t elapsed_minutes() const
	{
		return elapsed<minutes>();
	}

	//小时
	int64_t elapsed_hours() const
	{
		return elapsed<hours>();
	}

private:
	time_point<high_resolution_clock> m_begin;
};

测试用例：

void futureFun()
{
	std::cout << "hello world" << std::endl;
}

int main(int argc, char *argv[])
{
	Timer t;
	futureFun();
	std::cout << t.elapsed() <<"毫秒"<< std::endl; //打印futureFun函数耗时
	std::cout << t.elapsed_nano() << "纳秒" << std::endl;
	std::cout << t.elapsed_seconds() << "秒" << std::endl;
	std::cout << t.elapsed_minutes() << "分钟" << std::endl;
	std::cout << t.elapsed_hours() << "小时" << std::endl;
	getchar();
	return 0;