chrono.cc

#include <random>
#include <chrono>
#include <iostream>

using namespace std::chrono;

class TimeCost {
public:
    TimeCost() : _start_time(std::chrono::high_resolution_clock::now()) {}

    void begin_time_point() {
        _start_time = std::chrono::high_resolution_clock::now();
    }

    double get_time_cost(bool is_reset = false) {
        auto end_time = std::chrono::high_resolution_clock::now();
        auto duration = std::chrono::duration_cast<std::chrono::microseconds>(
            end_time - _start_time);
        double cost = static_cast<double>(duration.count()) / 1e3;

        if (is_reset) {
            _start_time = std::chrono::high_resolution_clock::now();
        }

        return cost;
    }

private:
    std::chrono::high_resolution_clock::time_point _start_time;
};
int main() {
    TimeCost tc;
    cout << tc.get_time_cost() << "ms\n";
    return 0;
}