text: //---------------------------------------------------------------------------//
  // Copyright (c) 2014 Roshan <thisisroshansmail@gmail.com>
  //
  // Distributed under the Boost Software License, Version 1.0
  // See accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt
  //
  // See http://boostorg.github.com/compute for more information.
  //---------------------------------------------------------------------------//
  
  #include <algorithm>
  #include <iostream>
  #include <numeric>
  #include <vector>
  
  #include "perf.hpp"
  
  int rand_int()
  {
      return static_cast<int>((rand() / double(RAND_MAX)) * 25.0);
  }
  
  int main(int argc, char *argv[])
  {
      perf_parse_args(argc, argv);
      std::cout << "size: " << PERF_N << std::endl;
  
      // create vector of random numbers on the host
      std::vector<int> host_vector(PERF_N);
      std::generate(host_vector.begin(), host_vector.end(), rand_int);
      std::sort(host_vector.begin(), host_vector.end());
  
      perf_timer t;
      for(size_t trial = 0; trial < PERF_TRIALS; trial++){
          t.start();
          std::prev_permutation(host_vector.begin(), host_vector.end());
          t.stop();
          std::next_permutation(host_vector.begin(), host_vector.end());
      }
      std::cout << "time: " << t.min_time() / 1e6 << " ms" << std::endl;
  
      return 0;
  }
  