What is the best way to time how long functions take in C++? [duplicate]

Answer 1

You can find useful this class.

Using RAII idiom, it prints the text given in construction when destructor is called, filling elapsed time placeholder with the proper value.

Example of use:

int main()
{
   trace_elapsed_time t("Elapsed time: %ts.\n");
   usleep(1.005 * 1e6);
} 

Output:

Elapsed time: 1.00509s.