[63] C ++ Time Management (Timing in C ++)

A simple example of a print time

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

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();
}

After performing output display 1s.

Another use case is this more

#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 << "Timer took " << ms << "ms" << std::endl;
    }
};

void Function()
{
    Timer timer;

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

int main()
{
    Function();
    std::cin.get();
}

We create a Timer of the struct, 100 secondary calculate how much time print.

 

 

We can put the std :: endl remove each print

for (int i = 0; i < 100; i++)
        std::cout << "Hello\n";

In this way, to print, can significantly improve the time, because std :: endl always takes time.

 

 

In short, this is a very rough example of the calculation of the time, but you can help to understand.