SimpleStopWatch

SimpleStopWatch.h

namespace laziness {
	struct SimpleStopWatch {
		void start() {
			_start = std::chrono::high_resolution_clock::now();
		}
		
		template <typename T = std::chrono::nanoseconds>
		typename T::rep rap() {
			_end = std::chrono::high_resolution_clock::now();
			return std::chrono::duration_cast<T>(_end - _start).count();
		}
		
		template <typename T = std::chrono::nanoseconds>
		typename T::rep getLastRap() const {
			return std::chrono::duration_cast<T>(_end - _start).count();
		}
		
		auto getLastRapMilliseconds() const 
		-> decltype(getLastRap<std::chrono::milliseconds>()) {
			return getLastRap<std::chrono::milliseconds>();
		}
		
		auto getLastRapMicroseconds() const 
		-> decltype(getLastRap<std::chrono::microseconds>()) {
			return getLastRap<std::chrono::microseconds>();
		}
		
		auto getLastRapNanoseconds() const
		-> decltype(getLastRap<std::chrono::nanoseconds>()) {
			return getLastRap<std::chrono::nanoseconds>();
		}
		
		decltype(std::chrono::high_resolution_clock::now()) _start, _end;
	};
};

test.cpp

#include <iostream>

int main(int argc, char *argv[]) {
	laziness::SimpleStopWatch w;
	w.start();
	for(int i = 0; i < 100; i++) {
		std::cout << w.rap() << std::endl;
	}
	std::cout << "last" << std::endl;
	std::cout << w.getLastRap() << std::endl;
	
	return EXIT_SUCCESS;
}