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124 .\" ========================================================================
126 .IX Title "MooseX::Traits 3"
127 .TH MooseX::Traits 3 "2009-08-17" "perl v5.8.7" "User Contributed Perl Documentation"
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133 MooseX::Traits \- automatically apply roles at object creation time
135 .IX Header "SYNOPSIS"
141 \& has foo => ( is => \*(Aqro\*(Aq, isa => \*(AqInt\*(Aq required => 1 );
149 \& with \*(AqMooseX::Traits\*(Aq;
152 Apply the roles to the class at \f(CW\*(C`new\*(C'\fR time:
155 \& my $class = Class\->new_with_traits( traits => [\*(AqRole\*(Aq], foo => 42 );
158 Then use your customized class:
161 \& $class\->isa(\*(AqClass\*(Aq); # true
162 \& $class\->does(\*(AqRole\*(Aq); # true
163 \& $class\->foo; # 42
166 To apply traits to an existing instance:
169 \& $self\->apply_traits([qw/Role1 Role2/], { rebless_params => \*(Aqgo here\*(Aq });
172 .IX Header "DESCRIPTION"
173 Often you want to create components that can be added to a class
174 arbitrarily. This module makes it easy for the end user to use these
175 components. Instead of requiring the user to create a named class
176 with the desired roles applied, or applying roles to the instance
177 one-by-one, he can just pass a \f(CW\*(C`traits\*(C'\fR parameter to the class's
178 \&\f(CW\*(C`new_with_traits\*(C'\fR constructor. This role will then apply the roles
179 in one go, cache the resulting class (for efficiency), and return a
180 new instance. Arguments meant to initialize the applied roles'
181 attributes can also be passed to the constructor.
183 Alternatively, traits can be applied to an instance with \f(CW\*(C`apply_traits\*(C'\fR,
184 arguments for initializing attributes in consumed roles can be in \f(CW%$self\fR
185 (useful for e.g. Catalyst components.)
188 .ie n .IP "\fB\fB$class\fB\->new_with_traits(%args, traits => \e@traits)\fR" 4
189 .el .IP "\fB\f(CB$class\fB\->new_with_traits(%args, traits => \e@traits)\fR" 4
190 .IX Item "$class->new_with_traits(%args, traits => @traits)"
191 \&\f(CW\*(C`new_with_traits\*(C'\fR can also take a hashref, e.g.:
194 \& my $instance = $class\->new_with_traits({ traits => \e@traits, foo => \*(Aqbar\*(Aq });
196 .SH "ATTRIBUTES YOUR CLASS GETS"
197 .IX Header "ATTRIBUTES YOUR CLASS GETS"
198 This role will add the following attributes to the consuming class.
199 .SS "_trait_namespace"
200 .IX Subsection "_trait_namespace"
201 You can override the value of this attribute with \f(CW\*(C`default\*(C'\fR to
202 automatically prepend a namespace to the supplied traits. (This can
203 be overridden by prefixing the trait name with \f(CW\*(C`+\*(C'\fR.)
208 \& package Another::Trait;
210 \& has \*(Aqbar\*(Aq => (
211 \& is => \*(Aqro\*(Aq,
212 \& isa => \*(AqStr\*(Aq,
216 \& package Another::Class;
218 \& with \*(AqMooseX::Traits\*(Aq;
219 \& has \*(Aq+_trait_namespace\*(Aq => ( default => \*(AqAnother\*(Aq );
221 \& my $instance = Another::Class\->new_with_traits(
222 \& traits => [\*(AqTrait\*(Aq], # "Another::Trait", not "Trait"
223 \& bar => \*(Aqbar\*(Aq,
225 \& $instance\->does(\*(AqTrait\*(Aq) # false
226 \& $instance\->does(\*(AqAnother::Trait\*(Aq) # true
228 \& my $instance2 = Another::Class\->new_with_traits(
229 \& traits => [\*(Aq+Trait\*(Aq], # "Trait", not "Another::Trait"
231 \& $instance2\->does(\*(AqTrait\*(Aq) # true
232 \& $instance2\->does(\*(AqAnother::Trait\*(Aq) # false
236 Jonathan Rockway \f(CW\*(C`<jrockway@cpan.org>\*(C'\fR
238 Stevan Little \f(CW\*(C`<stevan.little@iinteractive.com>\*(C'\fR
239 .SH "COPYRIGHT AND LICENSE"
240 .IX Header "COPYRIGHT AND LICENSE"
241 Copyright 2008 Infinity Interactive, Inc.
243 <http://www.iinteractive.com>
245 This library is free software; you can redistribute it and/or modify
246 it under the same terms as Perl itself.