Measuring execution time with <chrono>

You can use the <chrono> library to measure the execution time of a function by following these steps:

1. Get the current time point before executing the function using std::chrono::high_resolution_clock::now().
2. Execute the function you want to measure.
3. Get the current time point after the function execution.
4. Calculate the duration between the start and end time points using std::chrono::duration_cast.

Here's an example:

1#include <chrono>
2#include <iostream>
3
4void someFunction() {
5  // Function code goes here
6}
7
8int main() {
9  using namespace std::chrono;
10  auto start = high_resolution_clock::now();  
11  someFunction();
12  auto end = high_resolution_clock::now();  
13
14  auto duration = duration_cast<microseconds>(
15    end - start);  
16
17  std::cout << "Execution time: "
18    << duration.count() << " microseconds\n";
19}

1Execution time: 3 microseconds

The std::chrono::high_resolution_clock provides the highest precision clock available on the system. You can adjust the duration cast to other units like std::chrono::milliseconds or std::chrono::seconds based on your needs.

Remember to compile with optimization flags (e.g., -O2 or -O3) to get accurate timing results, as debug builds may introduce additional overhead.