>>>>> "AH" == Austin Hastings <[EMAIL PROTECTED]> writes:
AH> --- Uri Guttman <[EMAIL PROTECTED]> wrote: >> @out = sort >> key:compare( \&my_compare_sub ) ( /(\d+)$/ ), >> @in ; >> note that the custome compare callbacks can be a block or a sub >> name/ref. the callback sub would be passed 2 args as usual. AH> Off the top of my head, I can't think of a case where the compare sub AH> would be needed unless the key was not well-ordered. Does anyone have AH> an example of a case where the key-extraction sub approach doesn't AH> reduce the problem to a Scalar comparison? there are rare times when you need a computed comparison, say with a specialized collation sequence. if this sequence isn't supported by locale or whatever, you need to do a callback comparison. i can't think of a real world example but maybe with some odd symbolic character set or a custom one. in any case, supporting the callback is easy. it has one drawback which is that it disallows the GRT but the guts could fallback to the ST then. in both cases, key extraction is the same. uri -- Uri Guttman ------ [EMAIL PROTECTED] -------- http://www.stemsystems.com --Perl Consulting, Stem Development, Systems Architecture, Design and Coding- Search or Offer Perl Jobs ---------------------------- http://jobs.perl.org
