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Postings from November 2009
karl williamson <public@khwilliamson.com> writes:
> Based on looking at existing code in utf8_heavy.pl, I had presumed
> that the Perl optimizer would remove code that depended on a constant
> subroutine that returns false. That is, 'foo if DEBUG' would be
> optimized away if there was a line: 'sub Debug { 0 }' But that
> appears to not be the case.
It needs a prototype: 'sub Debug () { 0 }'.
From perlsub:
# Functions with a prototype of "()" are potential candidates for
# inlining. If the result after optimization and constant folding is
# either a constant or a lexically‐scoped scalar which has no other
# references, then it will be used in place of function calls made
# without "&". Calls made using "&" are never inlined. (See
# constant.pm for an easy way to declare most constants.)
Eirik
--
All bridge hands are equally likely, but some are more equally likely
than others.
-- Alan Truscott
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