C++性能测试模板

// test.cpp 文件

#include 
#include 
#include 

using namespace std;

template 
R time_code(F func) 
{
	auto then = std::chrono::system_clock::now();

	for (int i = 0; i < Count; ++i) {
		func();
	}

	auto now = std::chrono::system_clock::now();
	auto dur = now - then;

	return std::chrono::duration_cast(dur);
}

template 
R time_code_once(F func) {
	return time_code(func);
}


int main() 
{

	constexpr int Count = 10;
	using ms = std::chrono::microseconds;

	auto time1 = time_code([]() {
		printf("Hello Worldn");
	});

	std::cerr << "printf("Hello World\n") x 10, Took: " << time1.count() << " xC2xB5s to execute." << std::endl;

	auto time2 = time_code_once([]() {
		printf("Hello Worldn");
	});

	std::cerr << "printf("Hello World\n") once, Took: " << time2.count() << " xC2xB5s to execute." << std::endl;

}

编译以上源码：g++ test.cpp -o main -std=c++11

编译完成以后运行：./main

输出如下：