ceph/src/boost/libs/hana/benchmark/measure.hpp

   1 // Copyright Louis Dionne 2013-2017
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #ifndef BOOST_HANA_BENCHMARK_MEASURE_HPP
   6 #define BOOST_HANA_BENCHMARK_MEASURE_HPP
   7
   8 #include <chrono>
   9 #include <iostream>
  10
  11
  12 namespace boost { namespace hana { namespace benchmark {
  13     auto measure = [](auto f) {
  14         constexpr auto repetitions = 500ull;
  15         auto start = std::chrono::steady_clock::now();
  16         for (auto i = repetitions; i > 0; --i) {
  17             f();
  18         }
  19         auto stop = std::chrono::steady_clock::now();
  20
  21         auto time = std::chrono::duration_cast<std::chrono::duration<float>>(
  22             (stop - start) / repetitions
  23         );
  24         std::cout << std::fixed;
  25         std::cout << "[execution time: " << time.count() << "]" << std::endl;
  26     };
  27 }}}
  28
  29 #endif