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Answer: How do I reference methods?

by mirod (Canon)
on Mar 07, 2001 at 18:09 UTC ( #62749=categorized answer: print w/replies, xml ) Need Help??

Q&A > object-oriented programming > How do I reference methods? - Answer contributed by mirod

You can use closures:

#!/bin/perl -w use strict; # just a simple package package obj; sub new { return bless {content => $_[0]}; } sub print { my $self= shift; print ref($self), ": ", $self->{content}, " - ", @_, "\n"; } # now the main stuff package main; my $p; # that's your method reference { my $o= obj::new( "toto"); # the normal way: create $o->print( "tata"); # print $p=sub { $o->print(@_); }; # create the closure (an anon sub) $p->( "titi"); # use it to print $o= obj::new "foo"; # change the object $p->("tutu"); # print using the new object } my $o= obj::new "bar"; # the $o used with the closure is not # in scope any more $p->("tutu"); # but $p still uses it

This returns:

obj: toto - tata obj: toto - titi obj: foo - tutu obj: foo - tutu

Note that as far as convenience goes calling $o->print or $p->print is pretty similar ;--)

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[msh210]: I don't have sendmail (I'm on MS Windows), so does one of you think you can report the bug?
[shmem]: msh210: 'tis about time to tell the sad truth to perl5porters - via perlbug
[msh210]: probably whoever wrote that actually knows the truth
[shmem]: msh210: you can save the perlbug text in a file and send that via your mail agent of choice
[msh210]: hm, okay, I'll try, thanks
[shmem]: ...not as an attachment, it's probably better to c&p that into the mail body

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