map vector flat map benchmark

#include <ctime>
#include <iostream>
#include <vector>
#include <algorithm>
#include <stack>
#include <map>
#include "boost/container/flat_map.hpp"

using namespace std;

namespace {

  template <class S> void time_copy_test(size_t np, const S& s)
  {
    const clock_t start = clock();
    for(size_t i=0;i<np;++i)
      S temp = s;
    cout << static_cast<double>(clock()-start)/CLOCKS_PER_SEC << endl;
  }
}

int main(void)
{
    const size_t np = 100000000;
    cout << "stl map: ";
    time_copy_test(np,std::map<size_t,double>());
    cout << "stl vector: ";
    time_copy_test(np,vector<double>());
    cout << "boost flat map: ";
    time_copy_test(np,boost::container::flat_map<size_t,double>());
    return 0;
}