Re: Generally, are the programs written by C++ slower than written by C 10% ?

Hi Paavo

Modified the test a little to make sure the std::string
actually was created, it makes quite a difference:

#include <iostream>
#include <string>
#include <cstring>
#include <time.h>
#include <stdlib.h>
#include <conio.h>

int _tmain(int argc, char* argv[])
{
    clock_t tbeg;
    char *cStr = "123456789012345678901234567890";
    const int L = strlen( cStr ) + 1;

     tbeg = clock();
     for (int i = 0; i < 10000000; i++)
     {
       std::string test(cStr);
       if( test[5] == '0' )
          std::cout << "error" << std::endl;
     }

     std::cout << "test 1 use " << clock() - tbeg << std::endl;

     tbeg = clock();
     for (int i = 0; i < 10000000; i++)
     {
       char* str = new char[L];
       strcpy(str, cStr);
       if( str[5] == '0' )
          std::cout << "error" << std::endl;
       delete [] str;
     }

     std::cout << "test 2 use " << clock() - tbeg << std::endl;

     tbeg = clock();
     for (int i = 0; i < 10000000; i++)
     {
       char* str = (char*)malloc(L);
       strcpy(str, cStr);
       if( str[5] == '0' )
          std::cout << "error" << std::endl;
       free(str);
     }

     std::cout << "test 3 use " << clock() - tbeg << std::endl;

    getch();
    return 0;
}

test 1 use 1451
test 2 use 998
test 3 use 749

why is malloc faster then new ??

Best regards
Asger-P