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We can use the following syntax to calculate the execution time of a code snippet:

auto start = high_resolution_clock::now();　//　Start time
//Code segment
auto stop = high_resolution_clock::now();　//　Stop time
auto duration = duration_cast<microseconds>(stop　-　start);　//　Duration

The 'high_resolution_clock' class is defined in the 'chrono' header file. The functionnow()It is returning a value corresponding to the point of the call.

Header files are used to record the time spent on the specific code.

#include <chrono>
using namespace std::chrono;

The following is an example of calculating the execution time of a code segment.

Example

#include <iostream>
#include <chrono>
using namespace std::chrono;
using namespace std;
int sum(int x, int y) {
　　　int s = x　+　y;
　　　cout << "The sum of numbers: " << s;
}
int main() {
　　　auto start = high_resolution_clock::now();
　　　sum(28,　8);
　　　auto stop = high_resolution_clock::now();
　　　auto duration = duration_cast<microseconds>(stop　-　start);
　　　cout << "\nTime taken by function: " << duration.count() << " microseconds";
　　　return 0;
}

Output result

The sum of numbers:　36
Time taken by function:　42　microseconds

In the above program,sum()A function is defined to calculate the sum of numbers.

int sum(int x, int y) {
　　　int s = x　+　y;
　　　cout << "The sum of numbers: " << s;
}

Inmain()In the function, wesum()The time spent on the function is recorded by using some predefined functions and the 'chrono' class.

auto start = high_resolution_clock::now();
sum(28,　8);
auto stop = high_resolution_clock::now();
auto duration = duration_cast<microseconds>(stop　-　start);