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

From:
Asger-P <junk@asger-p.dk>
Newsgroups:
comp.lang.c++
Date:
Wed, 07 Sep 2011 00:40:37 +0200
Message-ID:
<op.v1erxzl52juju3@ajwin7>
Hi Paavo Helde

On the: 06. of september-2011 At: 22:10 Paavo Helde wrote:

     std::string test(cStr, L-1);

And yes, passing L here makes the tests more fair, as malloc/new got the
size L, but std::string did not in the original version.


That is right, but then the std::string knows the length all
the way arround, so I think it would e fair to give the same
advantage to char array, like this.

int main(int argc, char* argv[])
{
    clock_t tbeg;
    char *cStr =
"123456789012345678901234567890123456789012345678901234567890";
    const int L = strlen( cStr );

    tbeg = clock();
    for (int i = 0; i < 10000000; i++)
    {
       std::string test(cStr, L);
       std::string test2 = test;
       test2 += test;
       if( test2[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+1];
       strncpy(str, cStr, L);
       char* str2 = new char[L*2 + 2];
       strncpy(str2, str, L);
       strncpy(&str2[L], str, L);
       if( str2[5] == '0' )
          std::cout << "error" << std::endl;
       delete [] str;
       delete [] str2;
    }

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

    tbeg = clock();
    for (int i = 0; i < 10000000; i++)
    {
       char* str = (char*)malloc(L+1);
       strncpy(str, cStr, L);
       char* str2 = (char*)malloc(L*2 + 2);
       strncpy(str2, str, L);
       strncpy(&str2[L], str, L);
       if( str2[5] == '0' )
          std::cout << "error" << std::endl;
       free(str);
       free(str2);
    }

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

    getch();
    return 0;
}

and then the numbers are really in favor of char array,
not the amount of coding though.

test 1 use 3744
test 2 use 2090
test 3 use 1623

Best regards
Asger-P

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