Re: How to test memory allocation with new ?

[Larry I Smith]

jjleto wrote:
> Hello,
>
> How do I handle the following :
>
> ------>
>     #include <iostream>
>     using namespace std;
>
>     int main()
>     {
>         int n = 0x7FFFFFFF;
>         char *pp = new char(n);
>         if ( pp != NULL ) {
>             pp[0] = 0;
>             pp[n-1] = 0;
>             cout << "OK" << endl;
>         } else {
>             cout << "FAILED" << endl;
>         }
>     }
> ------>
>
>
> It compiles OK, but when I run it, I get a segmentation fault. I thought 
> that testing a NULL value was enough for testing memory allocation (or 
> perhaps it is a bug ? I use gcc (GCC) 3.3.4)
>
> Regards,
> jjleto

#include <iostream>
using namespace std;

int main()
{
    char * pp;

    // given this value, 'new' will fail if less than 2GB of free RAM
    // is available
    int n = 0x7FFFFFFF;

    try
    {
        cout << "Allocate an array of " << n << " bytes in RAM" << endl;
        pp = new char[n];
    }
    catch (bad_alloc)
    {
        cout << "Allocation Attempt Failed" << endl;
        return 1;
    }

    pp[0] = 0;
    pp[n - 1] = 0;
    cout << "OK" << endl;

    delete[] pp;  // free the allocated array

    return 0;
}

Regards,
Larry

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