C++ time profiling example

main.cpp

//from Howard Hinnant's answer https://stackoverflow.com/a/18303787

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

std::random_device eng; //can be used to generate random input for test cases
std::uniform_int_distribution<std::size_t> random(500, 1000);

//a function template that executes a given function object and returns
//its execution time
template<typename Func>
std::chrono::high_resolution_clock::duration getExecutionTime(Func&& f)
{
    auto t0 = std::chrono::high_resolution_clock::now();
    f();
    auto t1 = std::chrono::high_resolution_clock::now();
    return t1 - t0;
}

int main()
{
    const int n = 10000; //number of iterations
    using nano = std::chrono::duration<double, std::nano>;
    nano ns(0);
    for (int i = 0; i < n; ++i) { //n iterations
        //TODO: setup test paramaters. random numbers can be generated by e.g.
        //int size = random(eng);
        ns += getExecutionTime([&](){ //capture test parameters by reference
            //TODO: do whatever you want to profile here
        });
    }
    ns /= n;
    std::cout << "average execution time: " << ns.count() << " ns\n";
}