Type::Tiny::Manual::UsingWithMouse - how to use Type::Tiny and Type::Library with Mouse
{
package Person;
use Mouse;
use Types::Standard qw( Str Int );
has name => (
is => "ro",
isa => Str,
);
my $PositiveInt = Int
-> where( sub { $_ > 0 } )
-> plus_coercions( Int, sub { abs $_ } );
has age => (
is => "ro",
isa => $PositiveInt,
coerce => 1,
writer => "_set_age",
);
sub get_older {
my $self = shift;
my ($years) = @_;
$PositiveInt->assert_valid($years);
$self->_set_age($self->age + $years);
}
}
Mouse support in Type::Tiny was somewhat of an afterthought. It should work, but is not anywhere near as well-tested as Moo or Moose support.
Type::Tiny is tested with Mouse 1.00 and above.
Type::Tiny type constraints have an API almost identical to that of Mouse::Meta::TypeConstraint. As a result, you can use a Type::Tiny object pretty much anywhere you'd use a Mouse::Meta::TypeConstraint and you are unlikely to notice the difference. (And Mouse is unlikely to notice the difference too!)
Type::Tiny offers convenience methods to alter the list of coercions associated with a type constraint. Let's imagine we wish to allow our name attribute to be coerced from an arrayref of strings.
has name => (
is => "ro",
isa => Str->plus_coercions(
ArrayRef[Str], sub { join " ", @{$_} },
),
coerce => 1,
);
This coercion will apply to the name attribute only; other attributes using the Str type constraint will be unaffected.
See the documentation for plus_coercions, minus_coercions and no_coercions in Type::Tiny.
Mouse's built-in type constraints are implemented using XS and are stupidly fast. For many type constraints, if Type::Tiny notices Mouse is loaded early enough, Type::Tiny will borrow Mouse's XS subs.
See also Type::Tiny::Manual::Optimization.
Type::Tiny and MouseX::Types type constraints should "play nice". If, for example, ArrayRef is taken from Types::Standard (i.e. a Type::Tiny-based type library), and PositiveInt is taken from MouseX::Types::Common::Numeric, then the following should "just work":
isa => ArrayRef[ PositiveInt ] isa => PositiveInt | ArrayRef
For examples using Type::Tiny with Mouse see the SYNOPSIS sections of Type::Tiny and Type::Library, and the Mouse integration tests, and MouseX-Types integration tests in the test suite.
Toby Inkster <tobyink@cpan.org>.
This software is copyright (c) 2013-2014, 2017-2019 by Toby Inkster.
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