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.\" ========================================================================
.\"
.IX Title "MooseX::Types::VariantTable::Declare 3pm"
.TH MooseX::Types::VariantTable::Declare 3pm "2011-02-27" "perl v5.10.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
MooseX::Types::VariantTable::Declare \- Declarative sugar for
MooseX::Types::VariantTable based methods.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    package Awesome;
\&    use Moose;
\&
\&    variant_method dance => Item => sub {
\&        # Item is the least derived type in the hierarchy,
\&        # every other type subtypes it
\&        # this is in effect a fallback
\&        return "fallback";
\&    };
\&
\&    # a more specific type
\&    variant_method dance => Ballerina => sub {
\&        my ( $self, $ballerina, @args ) = @_;
\&
\&        $ballerina; # a value that passed the TC named "Ballerina"
\&
\&        return "pretty!";
\&    };
\&
\&    # also works with objects
\&    variant_method dance => $type_object => sub { ... };
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides declarative sugar for defining
Moose::Meta::Method::VariantTable methods in your Moose classes and
roles.
.PP
These methods have some semantics:
.SS "Declaration"
.IX Subsection "Declaration"
The order of the declarations do not matter in most cases.
.PP
It is the type hierarchy that defines the order in which the constraints are
checked and items dispatched.
.PP
However, in the case that two constraints without an explicit relationship
between them (one is a subtype of the other) both accept the same value, the
one that was declared earlier will win. There is no way around this issue, so
be careful what types you use especially when mixing variants form many
different sources.
.PP
Adding the same type to a variant table twice is an error.
.SS "Inheritence"
.IX Subsection "Inheritence"
When dispatching all of the subclass's variants will be tried before the
superclass.
.PP
This allows shadowing of types from the superclass even using broader types.
.SS "Roles"
.IX Subsection "Roles"
\&... are currently broken.
.PP
Don't use variant table methods in a role, unless that's the only definition,
because in the future variant table merging will happen at role composition
time in a role composition like way, so your code will not continue to work the
same.