Support header for runtime benchmarks with the Benchcc gem.

benchmark.hpp

/*
@copyright Louis Dionne 2014
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>
#include <thread>


namespace boost { namespace hana { namespace benchmark {
    template <int i>
    struct object {
        constexpr object() = default;

        object(object const&) {
            std::this_thread::sleep_for(std::chrono::nanoseconds(1));
        }
    };

    auto measure = [](auto f) {
        constexpr auto repetitions = 1000ull;
        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::microseconds>(
            (stop - start) / repetitions
        );
        std::cout << "execution time: " << time.count() << std::endl;
    };
}}}

#endif // !BOOST_HANA_BENCHMARK_MEASURE_HPP

This file is not used anymore. Instead, Benchmarks.cmake contains a hardcoded version of this file, so it does not have to download it every time CMake is reconfigured. This is left here in case someone uses an old version of Benchmarks.cmake which requires downloading this file, but consider upgrading if this is the case.