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MooseX::MultiMethods

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 AT debian DOT org>

COPYRIGHT AND LICENSE

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.

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