Re: How to call a sub-routine ref

alling a subroutine from a reference

assuming for a second you are talking about a reference such as


| stuff before

my $sref = \&foo 

| stuff after
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then you would call it thusly:


| later

&($sref)( arg1....argn);

|
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where "arg1...argn" would be replaced by the arguments you want passed to the sub.

Here is a more complete example:

#!/usr/bin/perl -w

use strict;

my $sref=\&foo;

&{$sref};

exit(0);

sub foo {
        print "This is foo.\n";
}
[download]

Peter L. Berghold -- Unix Professional
Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg

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Re^2: How to call a sub-routine ref by greengaroo (Hermit) on Oct 19, 2012 at 20:36 UTC
Yes I know. Here is another example with an anonymous subroutine: `my $ref = sub { print "Hello World!\n"; }; # Both are equivalent $ref->(); &{$ref}(); # But which one is best? That is the question!` [download] Also, I don't do simple stuff like that, I have objects and callback functions and so on. Most of the time I have deep structures that returns functions, or objects, then I want to call that function or object method. Let me sleep on it and I will try to provide a more concrete example. There are no stupid questions, but there are a lot of inquisitive idiots. -- greengaroo	[reply] [d/l]
Re^3: How to call a sub-routine ref by blue_cowdawg (Monsignor) on Oct 22, 2012 at 12:47 UTC
Did you actually test that code? `$ cat greengaroo.pl use strict; my $ref = sub { print "Hello World!\n"; }; # Both are equivalent $ref->(); &{ref}(); # But which one is best? That is the question! $ perl greengaroo.pl Hello World! Undefined subroutine &main::ref called at greengaroo.pl line 9.` [download] your second call fails. If you fix this by rewriting it thusly: `&{$ref}();` [download] there is still the open question of "which is better?" From a readability standpoint I'd vote for the latter rather than the former. Others may disagree but that is the essence of TIMTOWTDI. If you feel there may be a performance issue involved here have you tried profiling the code? Peter L. Berghold -- Unix Professional Peter -at- Berghold -dot- Net; AOL IM redcowdawg Yahoo IM: blue_cowdawg	[reply] [d/l] [select]
Re^4: How to call a sub-routine ref by greengaroo (Hermit) on Oct 22, 2012 at 14:27 UTC
You are right! I forgot a $... sorry about that! Thanks for pointing it!	[reply]