Re: Re: Re: constants within regular expression?

i don't know what the empty prototype implies for inlining, but it also keeps the sub from swallowing arguments.

sub A () {1};
sub B {2};
print A + 1,$/;
print B + 1,$/;

__END__
prompt$ perl test.pl
2
2prompt$
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without the empty prototype subs wouldn't work very well for constants.

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Re: Re: Re: Re: constants within regular expression? by Anonymous Monk on Nov 26, 2003 at 07:54 UTC
i don't know what the empty prototype implies for inlining Read this and you will (from `perldoc perlsub)`: `Constant Functions Functions with a prototype of "()" are potential candidates for inlin- ing. 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.)` [download]	[reply] [d/l]

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Re: Re: Re: Re: constants within regular expression?
by Anonymous Monk on Nov 26, 2003 at 07:54 UTC

i don't know what the empty prototype implies for inlining

Read this and you will (from perldoc perlsub):

Constant Functions

Functions with a prototype of "()" are potential candidates for inlin-
ing.  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.)
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[reply]
[d/l]