Easily measure elapsed time

Question

I am trying to use time() to measure various points of my program.

What I don\'t understand is why the values in the before and after are the same? I understand thi

Answer 1

struct profiler
{
    std::string name;
    std::chrono::high_resolution_clock::time_point p;
    profiler(std::string const &n) :
        name(n), p(std::chrono::high_resolution_clock::now()) { }
    ~profiler()
    {
        using dura = std::chrono::duration;
        auto d = std::chrono::high_resolution_clock::now() - p;
        std::cout << name << ": "
            << std::chrono::duration_cast(d).count()
            << std::endl;
    }
};

#define PROFILE_BLOCK(pbn) profiler _pfinstance(pbn)

Usage is below ::

{
    PROFILE_BLOCK("Some time");
    // your code or function
}

THis is similar to RAII in scope

NOTE this is not mine, but i thought it was relevant here