Timing.md

Timing in C++

Since C++17 we have the <chrono> library.

If we need really precise measures we can always use specific libraries from the Operating System.

Here we are addressing multiplatform in C++.

Bellow we have a awesome and easy to use pattern to measure time. When the Timer struct goes out of the scope, it automatically do it's job!

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

struct Timer
{
    std::chrono::time_point<std::chrono::steady_clock> start, end;
    std::chrono::duration<float> duration;

    Timer()
    {
        start = std::chrono::high_resolution_clock::now();
    }

    ~Timer()
    {
        end = std::chrono::high_resolution_clock::now();
        duration = end - start;
        float ms = duration.count() * 1000.0f;

        std::cout << "Time took " << ms << "ms " << std::endl;
    }
};

void Function()
{
    Timer timer;

    for (int i = 0; i < 100; i++)
    {
        std::cout << "Hello" << std::endl;
    }
}

int main()
{
    using namespace std::literals::chrono_literals;

    auto start = std::chrono::high_resolution_clock::now();
    std::this_thread::sleep_for(1s);

    auto end = std::chrono::high_resolution_clock::now();

    std::chrono::duration<float> duration = end - start;

    std::cout << duration.count() << "s " << std::endl;

    std::cin.get();
}