time any callable

timeit.cpp

template<class F, class ...Args>
void timeit(uint32_t repeat, F&& f, Args&&... args)
{
    auto begin_time = chrono::high_resolution_clock::now();
    for(uint32_t i = 0; i < repeat; ++i)
        f(forward<Args>(args)...);
    auto end_time = chrono::high_resolution_clock::now();

    printf("total time: %lldus\n", chrono::duration_cast<chrono::microseconds>(end_time - begin_time).count());
    printf("average time: %lldns\n", chrono::duration_cast<chrono::nanoseconds>(end_time - begin_time).count() / repeat);
}