#include <iostream>
#include <string>
#include <sys/timeb.h>

/*!
  Test on appeand and operator +.
  case 1: at
  case 2: []
*/
void test_str_indexing()
{
  std::string s(20000, '.');

  struct timeb tb0, tb1, tb2;
  size_t i1(10000);
  char ch;

  ::ftime(&tb0);  
  for (size_t i = 0; i < i1; ++ i) {
    for (size_t j = 0; j < s.size(); ++ j) ch = s.at(j);
  }
  ::ftime(&tb1);
  for (size_t i = 0; i < i1; ++ i) {
    for (size_t j = 0; j < s.size(); ++ j) ch = s[j];
  }
  ::ftime(&tb2);

  time_t diff1 = (tb1.time - tb0.time)*1000 + (tb1.millitm - tb0.millitm);
  time_t diff2 = (tb2.time - tb1.time)*1000 + (tb2.millitm - tb1.millitm);
  double ratio = diff1/(double)diff2;
#ifdef NDEBUG
  std::cout << "Release - ";
#else
  std::cout << "Debug   - ";
#endif
  std::cout << "Time spend: at()/[] =" << diff1 << "/" << diff2 << "\t= " << ratio << std::endl;
}

int main()
{
  test_str_indexing();
  return 0;
}