measure.hpp

// Copyright Louis Dionne 2013-2017
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)

#ifndef BOOST_HANA_BENCHMARK_MEASURE_HPP
#define BOOST_HANA_BENCHMARK_MEASURE_HPP

#include <chrono>
#include <iostream>


namespace boost { namespace hana { namespace benchmark {
    auto measure = [](auto f) {
        constexpr auto repetitions = 500ull;
        auto start = std::chrono::steady_clock::now();
        for (auto i = repetitions; i > 0; --i) {
            f();
        }
        auto stop = std::chrono::steady_clock::now();

        auto time = std::chrono::duration_cast<std::chrono::duration<float>>(
            (stop - start) / repetitions
        );
        std::cout << std::fixed;
        std::cout << "[execution time: " << time.count() << "]" << std::endl;
    };
}}}

#endif