std::chrono example - simple game loop

chrono-gameloop.cpp

#include <chrono>
#include <iostream>

using namespace std::literals::chrono_literals;

void input() {
}

void update() {
  // Do something to kill the time
  long long some_number = 1799997;
  for (unsigned i = 0; i<1000000; i++) {
      some_number *= some_number + some_number;
  }
}

void render() {
}

int main() {

  bool is_running = true;
  unsigned int frame = 0;

  auto last_timepoint = std::chrono::steady_clock::now();
  while (is_running) {
      std::cout << "Loop:" << std::endl;
      
      input();
      
      auto current_timepoint = std::chrono::steady_clock::now();
      while (current_timepoint - last_timepoint < 16ms) { // No more than 60 FPS
        std::cout << "> updating..." << std::endl;
        update();
        current_timepoint = std::chrono::steady_clock::now();
      }
      last_timepoint = current_timepoint;
      
      render();
      frame++;
      if (3 == frame) {
          is_running = false;
      }
  }
}