Will the D GC be awesome?

[Marco Leise]

Am Thu, 04 Oct 2012 16:12:43 +0200
schrieb "Simen Kjaeraas" <simen.kjaras at gmail.com>:

> On 2012-27-04 07:10, Walter Bright <newshound1 at digitalmars.com> wrote:
> 
> >> * OpCmp returning an int is fugly I r sad
> >
> > How else would you return a 3 state value?
> 
> enum Comparison {
>      Before = -1,
>      Same = 0,
>      After = 1,
>      Unordered = NaN,
> }
> 
> I'm not saying it should be done, but it would be more readable
> (and more cmoplex to write).

a) There is no integer NaN and floating point is a no-go.
b) If you mix sortable and unsortable most algorithms fail.

Otherwise an enum solution is good, but a bit longer in
code:

auto rel = a.OpCmp(b);
if (rel < 0) ...;
else if (rel > 0) ...;
else ...;

vs.

if (rel == Comparison.Before) ...;
else if (rel == Comparison.After) ...;
else ...;

And in many cases right now you can just "return a - b";

-- 
Marco