Limit framerate at 5 Hz (200 ms)

framelimit.cpp

// source: https://web.archive.org/web/20190809011021/https://stackoverflow.com/questions/38730273/how-to-limit-fps-in-a-loop-with-c
// cody by HolyBlackCat

#include <iostream>
#include <cstdio>
#include <chrono>
#include <thread>

std::chrono::system_clock::time_point a = std::chrono::system_clock::now();
std::chrono::system_clock::time_point b = std::chrono::system_clock::now();

int main()
{
    while (true)
    {
        // Maintain designated frequency of 5 Hz (200 ms per frame)
        a = std::chrono::system_clock::now();
        std::chrono::duration<double, std::milli> work_time = a - b;

        if (work_time.count() < 200.0)
        {
            std::chrono::duration<double, std::milli> delta_ms(200.0 - work_time.count());
            auto delta_ms_duration = std::chrono::duration_cast<std::chrono::milliseconds>(delta_ms);
            std::this_thread::sleep_for(std::chrono::milliseconds(delta_ms_duration.count()));
        }

        b = std::chrono::system_clock::now();
        std::chrono::duration<double, std::milli> sleep_time = b - a;

        // Your code here

        printf("Time: %f \n", (work_time + sleep_time).count());
    }
}