MooseX::MultiMethods.3pm

Langue: en

Version: 2010-01-03 (fedora - 01/12/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

MooseX::MultiMethods - Multi Method Dispatch based on Moose type constraints

VERSION

version 0.10

SYNOPSIS

     package Paper;    use Moose;
     package Scissors; use Moose;
     package Rock;     use Moose;
     package Lizard;   use Moose;
     package Spock;    use Moose;
 
     package Game;
     use Moose;
     use MooseX::MultiMethods;
 
     multi method play (Paper    $x, Rock     $y) { 1 }
     multi method play (Paper    $x, Spock    $y) { 1 }
     multi method play (Scissors $x, Paper    $y) { 1 }
     multi method play (Scissors $x, Lizard   $y) { 1 }
     multi method play (Rock     $x, Scissors $y) { 1 }
     multi method play (Rock     $x, Lizard   $y) { 1 }
     multi method play (Lizard   $x, Paper    $y) { 1 }
     multi method play (Lizard   $x, Spock    $y) { 1 }
     multi method play (Spock    $x, Rock     $y) { 1 }
     multi method play (Spock    $x, Scissors $y) { 1 }
     multi method play (Any      $x, Any      $y) { 0 }
 
     my $game = Game->new;
     $game->play(Paper->new, Rock->new);     # 1, Paper covers Rock
     $game->play(Spock->new, Paper->new);    # 0, Paper disproves Spock
     $game->play(Spock->new, Scissors->new); # 1, Spock smashes Scissors

DESCRIPTION

This module provides multi method dispatch based on Moose type constraints. It does so by providing a "multi" keyword that extends the "method" keyword provided by MooseX::Method::Signatures.

When invoking a method declared as "multi" a matching variant is being searched in all the declared multi variants based on the passed parameters and the declared type constraints. If a variant has been found, it will be invoked. If no variant could be found, an exception will be thrown.

AUTHOR

   Florian Ragwitz <rafl@debian.org>
This software is copyright (c) 2010 by Florian Ragwitz.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.