프로그램 실행시간 측정(Running time)

chrono 라이브러리를 활용한 프로그램 실행시간 측정코드

#include <iostream>
#include <vector>
#include <algorithm>
#include <random>
#include <chrono>

using namespace std;

class Timer
{
    using clock_t = std::chrono::high_resolution_clock;
    using second_t = std::chrono::duration<double, std::ratio<1>>;

    std::chrono::time_point<clock_t> start_time = clock_t::now();

public:
    void elapsed()
    {
        std::chrono::time_point<clock_t> end_time = clock_t::now();

        cout << std::chrono::duration_cast<second_t>(end_time - start_time).count() << endl;
    }
};

int main()
{
    random_device rnd_device;
    mt19937 mersenne_engine{ rnd_device() };

    vector<int> vec(10000);
    for (unsigned int i = 0; i < vec.size(); ++i)
        vec[i] = i;

    std::shuffle(begin(vec), end(vec), mersenne_engine);

    //for (auto& e : vec)
    //    cout << e << " ";
    //cout << endl;

    Timer timer;

    std::sort(begin(vec), end(vec));

    timer.elapsed();

    //for (auto& e : vec)
    //    cout << e << " ";
    //cout << endl;
}