In some cases it would be useful to overload functions based on knowing if a variable is a compile-time constant or not. For example:

void foo(int size)

{

    cout << 1 << endl;

}

template <int Size>

    void foo(int Size)

    {

        cout << 2 << endl;

    }

int main(int argc, char * argv[])

{

    foo(argc); // outputs 1

    foo(sizeof(int)); // outputs 2

}

Regards,