ceph/src/boost/libs/local_function/example/profile_cxx11_lambda.cpp

   1
   2 // Copyright (C) 2009-2012 Lorenzo Caminiti
   3 // Distributed under the Boost Software License, Version 1.0
   4 // (see accompanying file LICENSE_1_0.txt or a copy at
   5 // http://www.boost.org/LICENSE_1_0.txt)
   6 // Home at http://www.boost.org/libs/local_function
   7
   8 #include <boost/config.hpp>
   9 #ifdef BOOST_NO_CXX11_LAMBDAS
  10 #   error "lambda functions required"
  11 #else
  12
  13 #include <boost/chrono.hpp>
  14 #include <vector>
  15 #include <algorithm>
  16 #include <iostream>
  17 #include "profile_helpers.hpp"
  18
  19 int main(int argc, char* argv[]) {
  20     unsigned long size = 0, trials = 0;
  21     profile::args(argc, argv, size, trials);
  22
  23     double sum = 0.0;
  24     int factor = 1;
  25
  26     std::vector<double> v(size);
  27     std::fill(v.begin(), v.end(), 1.0);
  28
  29     boost::chrono::duration<double> trials_sec;
  30     for(unsigned long i = 0; i < trials; ++i) {
  31         boost::chrono::system_clock::time_point start =
  32                 boost::chrono::system_clock::now();
  33         std::for_each(v.begin(), v.end(), [&sum, factor](const double& num) {
  34             sum += factor * num;
  35         });
  36         trials_sec += boost::chrono::system_clock::now() - start;
  37     }
  38
  39     profile::display(size, trials, sum, trials_sec.count());
  40     return 0;
  41 }
  42
  43 #endif // LAMBDAS
  44