oracular (3) Object::Extend.3pm.gz

Provided by: libobject-extend-perl_0.4.0-2_all bug

NAME
       Object::Extend - add and override per-object methods


SYNOPSIS
           use Object::Extend qw(extend);

           my $foo1 = Foo->new;
           my $foo2 = Foo->new;

           extend $foo1 => {
               bar => sub { ... },
           };

           $foo1->bar; # OK
           $foo2->bar; # error


DESCRIPTION
       This module allows objects to be extended with per-object methods, similar to the use of singleton
       methods <http://madebydna.com/all/code/2011/06/24/eigenclasses-demystified.html> in Ruby. Object methods
       are added to an object-specific shim class (known as an "eigenclass"), which extends the object's
       original class. The original class is left unchanged.

   EXPORTS
       extend

       "extend" takes an object and a hash or hashref of method names and method values (coderefs) and adds the
       methods to the object's shim class. The object is then blessed into this class and returned.

       It can be used in standalone statements:

           extend $object, foo => sub { ... }, bar => \&bar;

       Or expressions:

           return extend($object => { bar => sub { ... } })->bar;

       In both cases, "extend" operates on and returns the supplied object i.e. a new object is never created.
       If a new object is needed, it can be created manually e.g.:

           my $object2 = Object->new($object1);
           my $object3 = clone($object1);

           extend($object2, foo => sub { ... })->foo;
           return extend($object3 => ...);

       Objects can be extended multiple times with new or overridden methods:

           # call the original method
           my $object = Foo->new;
           $object->foo;

           # override the original method
           extend $object, foo => sub { ... };
           $object->foo;

           # add a new method
           extend $object, bar => sub { ... };
           $object->bar;

       with

       This sub can optionally be imported to make the use of "extend" more descriptive. It takes and returns a
       hashref of method names/coderefs:

           use Object::Extend qw(extend with);

           extend $object => with { foo => sub { ... } };

       SINGLETON

       Every extended object's shim class includes an additional (empty) class in its @ISA which indicates that
       the object has been extended. The name of this class can be accessed by importing the "SINGLETON"
       constant e.g.:

           use Object::Extend qw(SINGLETON);

           if ($object->isa(SINGLETON)) { ... } # object extended with object-specific methods


VERSION
       0.4.0


SEE ALSO
       •   Class::SingletonMethod

       •   MooseX::SingletonMethod

       •   MouseX::SingletonMethod

       •   SingletonMethod <https://github.com/tom-lpsd/p5-singleton-method>


AUTHOR
       chocolateboy <chocolate@cpan.org>


       Copyright (C) 2013 by chocolateboy

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl
       itself, either Perl version 5.14.2 or, at your option, any later version of Perl 5 you may have
       available.