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Forked from gongzhitaao/CppTimer.md
Last active March 11, 2023 12:25
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Simple high resolution timer in C++
#include <iostream>
#include <ctime>
class Timer
{
public:
Timer() { clock_gettime(CLOCK_REALTIME, &beg_); }
double elapsed() {
clock_gettime(CLOCK_REALTIME, &end_);
return end_.tv_sec - beg_.tv_sec +
(end_.tv_nsec - beg_.tv_nsec) / 1000000000.;
}
void reset() { clock_gettime(CLOCK_REALTIME, &beg_); }
private:
timespec beg_, end_;
};
// Example code
int main()
{
Timer tmr;
double t = tmr.elapsed();
std::cout << t << std::endl;
tmr.reset();
t = tmr.elapsed();
std::cout << t << std::endl;
return 0;
}
#include <iostream>
#include <chrono>
class Timer {
public:
Timer() :
m_beg(clock_::now()) {
}
void reset() {
m_beg = clock_::now();
}
double elapsed() const {
return std::chrono::duration_cast<std::chrono::milliseconds>(
clock_::now() - m_beg).count();
}
private:
typedef std::chrono::high_resolution_clock clock_;
typedef std::chrono::duration<double, std::ratio<1> > second_;
std::chrono::time_point<clock_> m_beg;
};
// Example code
int main()
{
Timer tmr;
double t = tmr.elapsed();
std::cout << t << std::endl;
tmr.reset();
t = tmr.elapsed();
std::cout << t << std::endl;
return 0;
}
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