profiling.cpp

#include <chrono>
#include <string>
#include <iostream>

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<double>;
        auto d = std::chrono::high_resolution_clock::now() - p;
        std::cout << name << ": "
            << std::chrono::duration_cast<dura>(d).count() * 1000.0 << "ms"
            << std::endl;
    }
};

#define PROFILE_BLOCK(pbn) profiler _pfinstance(pbn)