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.IX Title "MooseX::LazyRequire 3"
.TH MooseX::LazyRequire 3 2026-04-21 "perl v5.42.2" "User Contributed Perl Documentation"
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.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&    package Foo;
\&
\&    use Moose;
\&    use MooseX::LazyRequire;
\&
\&    has foo => (
\&        is            => \*(Aqro\*(Aq,
\&        lazy_required => 1,
\&    );
\&
\&    has bar => (
\&        is      => \*(Aqro\*(Aq,
\&        builder => \*(Aq_build_bar\*(Aq,
\&    );
\&
\&    sub _build_bar { shift\->foo }
\&
\&
\&    Foo\->new(foo => 42); # succeeds, foo and bar will be 42
\&    Foo\->new(bar => 42); # succeeds, bar will be 42
\&    Foo\->new;            # fails, neither foo nor bare were given
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This module adds a \f(CW\*(C`lazy_required\*(C'\fR option to Moose attribute declarations.
.PP
The reader methods for all attributes with that option will throw an exception
unless a value for the attributes was provided earlier by a constructor
parameter or through a writer method.
.SH CAVEATS
.IX Header "CAVEATS"
Prior to Moose 1.9900, roles didn\*(Aqt have an attribute metaclass, so this module can\*(Aqt
easily apply its magic to attributes defined in roles. If you want to use
\&\f(CW\*(C`lazy_required\*(C'\fR in role attributes, you\*(Aqll have to apply the attribute trait
yourself:
.PP
.Vb 5
\&    has foo => (
\&        traits        => [\*(AqLazyRequire\*(Aq],
\&        is            => \*(Aqro\*(Aq,
\&        lazy_required => 1,
\&    );
.Ve
.PP
With Moose 1.9900, you can use this module in roles just the same way you can
in classes.