If you're looking for a quick and dirty solution and you're working with your own (hash-based) objects this should do the trick:
use strict;
use warnings;
use Test::More tests => 9;
{
package root;
sub base { "do" }
package foo;
@foo::ISA = 'root';
sub new { bless {@_[1 .. $#_]}, $_[0] }
sub hey { 'yo' }
}
sub add_method_to_class {
my($cls, $name, $meth) = @_;
no strict 'refs';
*{"$cls\::$name"} = $meth;
}
sub add_method_to_obj {
my($obj, $name, $meth) = @_;
my $class = ref $obj;
(my $objcls = "$obj") =~ s/[^A-Z0-9]//ig;
{
no strict 'refs';
*{"$objcls\::ISA"} = [ @{"$class\::ISA"}, $class ];
}
$_[0] = bless { %$obj }, $objcls;
add_method_to_class($objcls, $name, $meth);
}
can_ok foo => 'hey';
can_ok foo => 'base';
eval { foo->new->yay }
or pass "foo can't yay";
add_method_to_class('foo', yay => sub { "yay!" });
can_ok foo => 'yay';
my $o = foo->new;
eval { $o->woo }
or pass "\$o can't woo";
add_method_to_obj($o, woo => sub { "woo!" });
can_ok $o => 'woo';
eval { foo->new->woo }
or pass "foo can't woo";
can_ok $o => 'base';
can_ok $o => 'hey';
But if you're looking for a long-term robust solution then follow the sagacious davorg's advice.
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