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Re: more 5.9 sort tests

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david nicol
July 21, 2004 14:46
Re: more 5.9 sort tests
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On Wed, 2004-07-21 at 07:37, Rafael Garcia-Suarez wrote:
> david nicol wrote:
> > @@ -577,6 +577,13 @@
> >  @input = sort {$b <=> $a} @input;
> >  ok "@input", "G H I D E F A B C", 'stable $b <=> $a in place sort';
> >  
> > +# test that optimized {$b cmp $a} remains stable (new in 5.9)
> > +# without overloading
> > +@b = sort { $b <=> $a } @input = qw/5first 6first 5second 6second/;
> I assume you meant "cmp" instead of "<=>" here ?

no not at all.  We have been calling the optimization "{$b cmp $a}"
even though it works with both alpha-compare and the spaceship operator.

Switching to the spaceship in the comment would be clearer.

I was not aware that the overloaded tests were already in there when I
went to add the native-overloaded ones using "not-really-numbers." 
Overloaded values are treated a little bit different than native SVs
so the non-overloaded test does test a combination that is not being 
otherwise tested.  I cannot imagine a scenario where the oveloaded tests
would pass and 
     sort { $b <=> $a } @input = qw/5first 6first 5second 6second/
would fail.

Yes I can -- I have an active imagination -- a misguided fool makes sort
functioning dependent on the elements being magical.  These tests would 
then fail.

david nicol
    "People used to be able to read my thoughts, but
it doesn't appear to work any more. Should I eat less cheese?"
                                               -- Elizabeth Woods

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