| Type::Tiny::Manual::UsingWithMoo(3pm) | User Contributed Perl Documentation | Type::Tiny::Manual::UsingWithMoo(3pm) |
Type::Tiny::Manual::UsingWithMoo - how to use Type::Tiny and Type::Library with Moo
{
package Person;
use Moo 1.006000;
use Sub::Quote qw( quote_sub );
use Types::Standard qw( Str Int );
has name => (
is => "ro",
isa => Str,
);
my $PositiveInt = Int
-> where( quote_sub '$_ > 0' )
-> plus_coercions( Int, sub { abs $_ } );
has age => (
is => "rwp",
isa => $PositiveInt,
coerce => 1,
);
sub get_older {
my $self = shift;
my ($years) = @_;
$PositiveInt->assert_valid($years);
$self->_set_age($self->age + $years);
}
}
Type::Tiny is tested with Moo 1.001000 and above.
Type::Tiny overloads "&{}". Moo supports using objects that overload "&{}" as "isa" constraints, so Type::Tiny objects can directly be used in "isa".
Moo prior to 1.006000 doesn't support "coerce => 1", instead requiring a coderef to use as a coercion. However, Type::Tiny can provide you with a suitable coderef to use (actually an object that overloads "&{}"). Just use:
has age => (
is => "rwp",
isa => $PositiveInt,
coerce => $PositiveInt->coercion,
);
If you can upgrade to the latest Moo, and use "coerce => 1" you'll have a lot more fun though. :-)
Type::Tiny hooks into Moo's HandleMoose interface to ensure that type constraints get inflated to Moose type constraints if and when Moo inflates your class to a full Moose class.
The usual advice for optimizing type constraints applies: use type constraints which can be inlined whenever possible, and define coercions as strings rather than coderefs.
Upgrading to Moo 1.002000 or above should provide a slight increase in speed for type constraints, as it allows them to be inlined into accessors and constructors.
If creating your own type constraints using "Type::Tiny->new", then consider using Sub::Quote to quote the coderef; this allows you to take advantage of inlining without having to write your own inlining routines.
See also Type::Tiny::Manual::Optimization.
For examples using Type::Tiny with Moo see the SYNOPSIS sections of Type::Tiny and Type::Library, and the Moo integration tests <https://github.com/tobyink/p5-type-tiny/tree/master/t/30-integration/Moo> in the test suite.
Toby Inkster <tobyink@cpan.org>.
This software is copyright (c) 2013-2014, 2017-2019 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
| 2019-01-11 | perl v5.28.1 |