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In my experience, monkey patching usually is not worth its trouble. The problem you describe above I would solve by subclassing + duck typing: in Example::ErrorList, provide a method that returns list item class name, and instantiate objects of that name. This way you can subclass both Example::ErrorList and Example::Error in a "clean" way.

Like this:

package Example::ErrorList; sub list_item_class { 'Example::Error' } sub new { my ($class) = @_; my $item_class = $class->list_item_class; my $self = bless {}, $class; $self->{items} = [ map { $item_class->new($_) } @seed_list_or_some +thing ]; return $self; } package Example::Error; sub as_string { die "as_string should be implemented by subclass"; } sub asplode { my ($self) = @_; die "BANG! ".$self->as_string; } package My::AwesomeErrorList; use base 'Example::ErrorList'; sub list_item_class { 'My::AwesomeError' } package My::AwesomeError; use base 'Example::Error'; sub as_string { # Actually implement it }

You also have a typo: my $self = @_; won't work the way you expect.


In reply to Re: Safer monkey-patching by dwalin
in thread Safer monkey-patching by tobyink

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    [shmem]: hmm...
    [shmem]: Lady_Aleena: perl -MMP3::Tag -MFile::Find -le 'find(sub{if($File ::Find::name=~/\. mp3$/){$sum+=MP3:: Tag->new($_)-> interpolate("\%S ")} }, "Music"); print "total seconds: $sum"'
    [Lady_Aleena]: shmem, sorry I was outside for a moment moving my car out of hubby's way.
    [Lady_Aleena]: shmem, there is ONE song which throws a wrench in the works for both MP3::Info and MP3::Tag.

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