Howto create a Moose baseclass/superclass/contract? Moose equivalent of Module::Pluggable? Favorite way to create base/super class?

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

The use case is some app that does something with different backends

package iAmInYourIsa;
sub dothis { croak "subclass must implement dothis" }
...
[download]

so one backend is

package iAmInYourIsa::CGI;
use parent 'iAmInYourIsa';
use CGI;
sub dothis { ... my $q = CGI->new ... $q->param ... }
[download]

another is iAmInYourIsa::Tk and so on and so forth?

I could cobble something using Module::Pluggable, but the verbiage is all wrong :)

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Re: Howto create a Moose baseclass/superclass/contract? Moose equivalent of Module::Pluggable? Favorite way to create base/super class? by tobyink (Canon) on Dec 26, 2012 at 14:52 UTC
Don't use an abstract base class; use roles... `{ package IAmNotInYourIsa; use Moose::Role; requires 'dothis'; } { package My::CGI; use Moose; with 'IAmNotInYourIsa'; use CGI; sub dothis { ... my $q = CGI->new ... $q->param ... } } My::CGI->isa('IAmNotInYourIsa'); # false My::CGI->does('IAmNotInYourIsa'); # true!` [download] A good example can be seen in the Ask distribution on CPAN, where there are different implementations for STDIN/STDOUT, Tk, etc, each of which include: `with 'Ask::API';` [download] Ask uses Moo rather than Moose, but the principle is the same. `perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'`	[reply] [d/l] [select]
Re: Howto create a Moose baseclass/superclass/contract? Moose equivalent of Module::Pluggable? Favorite way to create base/super class? by karlgoethebier (Abbot) on Dec 26, 2012 at 14:52 UTC
Reading some manuals? Moose::Manual a.s.o. Saying "Please..."? Perhaps this helps? Regards, Karl P.S.:my goose was too fat. OK - Still got a hangover ŤThe Crux of the Biscuit is the Apostropheť	[reply]