C++ Chrono Usage Guide

The chrono library in C++ is used for handling dates and times, providing high-precision time measurement and clock functionality. It mainly includes several classes such as:

1. std::chrono::duration represents a span of time, including units such as seconds, milliseconds, and microseconds.
2. std::chrono::time_point: Represents a specific moment in time, formed by a clock and a duration point.
3. The system clock, provided by std::chrono::system_clock, gives the current system time.
4. std::chrono::steady_clock: a stable clock that provides stable time measurements.
5. std::chrono::high_resolution_clock is a high-precision clock that offers more accurate time measurements.

The chrono library makes it easy to get the current time, calculate time intervals, and perform delay operations. Here is an example code demonstrating how to use the chrono library to get the current time and calculate time intervals:

#include <iostream>
#include <chrono>

int main() {
    auto start = std::chrono::high_resolution_clock::now();

    // do something...

    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> elapsed_seconds = end - start;

    std::cout << "Time elapsed: " << elapsed_seconds.count() << " seconds" << std::endl;

    return 0;
}

In the above example, we used the high_resolution_clock to get the current time and calculate the time interval. You can choose the appropriate clock based on your specific needs for time measurement.