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Re^3: SDLx handlers and Moose

by Mr. Muskrat (Canon)
on May 25, 2012 at 17:53 UTC ( #972508=note: print w/replies, xml ) Need Help??

in reply to Re^2: SDLx handlers and Moose
in thread SDLx handlers and Moose

A callback is a reference to a function. If you put a method call where a callback is needed, it won't work as expected.

# The first one is wrong. It adds a reference to an subroutine named f +or the return value of $ship->move (or \&1) # because print returns 1 when it is successful. $app->add_move_handler ( \&{$ship->move} ); $app->add_move_handler ( sub { $ship->move( @_ ) } );

Try this to verify that:

#!/usr/bin/env perl use strict; use warnings; use Data::Dumper; $Data::Dumper::Deparse = 1; use Mob; my $ship = Mob->new(); my $first = \&{$ship->move}; print "first: ", Dumper( $first ); my $second = sub { $ship->move( @_ ) }; print "second: ", Dumper( $second ); # &$first(); # Uncomment to see the error 'Undefined subroutine &main: +:1 called at ./ line 17.' &$second( 1, 2 );

Update: chromatic replied while I was typing this up with more thorough answers than mine.

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