Re: Opinions: The Best and Worst of D (for a lecture/talk I intend to give)

[Dominikus Dittes Scherkl via Digitalmars-d-learn]

On Wednesday, 9 July 2014 at 19:54:47 UTC, H. S. Teoh via 
Digitalmars-d-learn wrote:
[...]
The problem is that the function needs to return
int, but given two uints, their difference may be
greater than int.max, so simply subtracting them
will not work. So the best I can come up with is:
        int compare2(int x, uint y)
        {
                return (x < 0) ? -1 :
                        (y > int.max) ? -1 :
                        (x - y);
        }

which requires 2 comparisons.

Hmm. Diff works for compare(int,int).
So how about this:

int compare2(int x, uint y)
{
   return (y > int.max) ? -1 : (x - cast(int)y);
}

int compare2(uint x, int y)
{
   return (x > int.max) ? -1 : (cast(int)x - y);
}