Re: Length of C++ arrays allocated by operator new[]

Marcel M?ller <news.5.maazl@spamgourmet.org> wrote:


  Why is this urban legend so persistent? People repeat it without actually
trying it.

  I just tested with these two programs:

//---------------------------------------------------------
int main()
{
    int* array = new int[10000];
    for(int i = 0; i < 10000; ++i) array[i] = i;
    int value = 0;
    for(int i = 0; i < 10000; ++i) value += array[i];
    delete[] array;
    return value;
}
//---------------------------------------------------------

//---------------------------------------------------------
#include <vector>

int main()
{
    std::vector<int> array(10000);
    for(int i = 0; i < 10000; ++i) array[i] = i;
    int value = 0;
    for(int i = 0; i < 10000; ++i) value += array[i];
    return value;
}
//---------------------------------------------------------

  The size of the first executable? 5104 bytes.
  The size of the second executable? 5528 bytes.

  Yeah, the size really exploded.