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[catagits/Gitalist.git] / local-lib5 / man / man3 / MooseX::StrictConstructor.3pm

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.\" ========================================================================
.\"
.IX Title "MooseX::StrictConstructor 3"
.TH MooseX::StrictConstructor 3 "2009-12-09" "perl v5.8.7" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
MooseX::StrictConstructor \- Make your object constructors blow up on unknown attributes
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    package My::Class;
\&
\&    use Moose;
\&    use MooseX::StrictConstructor;
\&
\&    has \*(Aqsize\*(Aq => ...;
\&
\&    # then later ...
\&
\&    # this blows up because color is not a known attribute
\&    My::Class\->new( size => 5, color => \*(Aqblue\*(Aq );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Simply loading this module makes your constructors \*(L"strict\*(R". If your
constructor is called with an attribute init argument that your class
does not declare, then it calls \*(L"\fICarp::confess()\fR\*(R". This is a great way
to catch small typos.
.SS "Subverting Strictness"
.IX Subsection "Subverting Strictness"
You may find yourself wanting to have your constructor accept a
parameter which does not correspond to an attribute.
.PP
In that case, you'll probably also be writing a \f(CW\*(C`BUILD()\*(C'\fR or
\&\f(CW\*(C`BUILDARGS()\*(C'\fR method to deal with that parameter. In a \f(CW\*(C`BUILDARGS()\*(C'\fR
method, you can simply make sure that this parameter is not included
in the hash reference you return. Otherwise, in a \f(CW\*(C`BUILD()\*(C'\fR method,
you can delete it from the hash reference of parameters.
.PP
.Vb 3
\&  sub BUILD {
\&      my $self   = shift;
\&      my $params = shift;
\&
\&      if ( delete $params\->{do_something} ) {
\&          ...
\&      }
\&  }
.Ve
.SH "AUTHOR"
.IX Header "AUTHOR"
Dave Rolsky, \f(CW\*(C`<autarch@urth.org>\*(C'\fR
.SH "BUGS"
.IX Header "BUGS"
Please report any bugs or feature requests to
\&\f(CW\*(C`bug\-moosex\-strictconstructor@rt.cpan.org\*(C'\fR, or through the web
interface at <http://rt.cpan.org>.  I will be notified, and then
you'll automatically be notified of progress on your bug as I make
changes.
.SH "COPYRIGHT & LICENSE"
.IX Header "COPYRIGHT & LICENSE"
Copyright 2007\-2008 Dave Rolsky, All Rights Reserved.
.PP
This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.