Type::Library - Online Linux Manual PageSection : 3pm
Updated : 2021-02-24
Source : perl v5.32.1
Note : User Contributed Perl Documentation
NAMEType::Library − tiny, yet Moo(se)−compatible type libraries
SYNOPSIS​ package Types::Mine { ​ use Scalar::Util qw(looks_like_number); ​ use Type::Library −base; ​ use Type::Tiny; ​ ​ my $NUM = "Type::Tiny"−>new( ​ name => "Number", ​ constraint => sub { looks_like_number($_) }, ​ message => sub { "$_ ain't a number" }, ​ ); ​ ​ _ _PACKAGE_ _−>meta−>add_type($NUM); ​ ​ _ _PACKAGE_ _−>meta−>make_immutable; ​ } ​ ​ package Ermintrude { ​ use Moo; ​ use Types::Mine qw(Number); ​ has favourite_number => (is => "ro", isa => Number); ​ } ​ ​ package Bullwinkle { ​ use Moose; ​ use Types::Mine qw(Number); ​ has favourite_number => (is => "ro", isa => Number); ​ } ​ ​ package Maisy { ​ use Mouse; ​ use Types::Mine qw(Number); ​ has favourite_number => (is => "ro", isa => Number); ​ }
STATUSThis module is covered by the Type-Tiny stability policy.
DESCRIPTIONType::Library is a tiny class for creating MooseX::Types−like type libraries which are compatible with Moo, Moose and Mouse. If you're reading this because you want to create a type library, then you're probably better off reading Type::Tiny::Manual::Libraries.
MethodsA type library is a singleton class. Use the meta method to get a blessed object which other methods can get called on. For example: ​ Types::Mine−>meta−>add_type($foo); add_type($type) or add_type(%opts) Add a type to the library. If %opts is given, then this method calls ​Type::Tiny−>new(%opts) first, and adds the resultant type. Adding a type named ‟Foo” to the library will automatically define four functions in the library's namespace: Foo Returns the Type::Tiny object. is_Foo($value) Returns true iff $value passes the type constraint. assert_Foo($value) Returns $value iff $value passes the type constraint. Dies otherwise. to_Foo($value) Coerces the value to the type. get_type($name) Gets the Type::Tiny object corresponding to the name. has_type($name) Boolean; returns true if the type exists in the library. type_names List all types defined by the library. add_coercion($c) or add_coercion(%opts) Add a standalone coercion to the library. If %opts is given, then this method calls Type::Coercion−>new(%opts) first, and adds the resultant coercion. Adding a coercion named ‟FooFromBar” to the library will automatically define a function in the library's namespace: FooFromBar Returns the Type::Coercion object. get_coercion($name) Gets the Type::Coercion object corresponding to the name. has_coercion($name) Boolean; returns true if the coercion exists in the library. coercion_names List all standalone coercions defined by the library. import(@args) Type::Library−based libraries are exporters. make_immutable A shortcut for calling $type−>coercion−>freeze on every type constraint in the library.
ConstantsNICE_PROTOTYPES If this is true, then Type::Library will give parameterizable type constraints slightly the nicer prototype of (;$) instead of the default (;@). This allows constructs like: ​ ArrayRef[Int] | HashRef[Int] ​... to ‟just work”.
ExportType libraries are exporters. For the purposes of the following examples, assume that the Types::Mine library defines types Number and String. ​ # Exports nothing. ​ # ​ use Types::Mine; ​ ​ # Exports a function "String" which is a constant returning ​ # the String type constraint. ​ # ​ use Types::Mine qw( String ); ​ ​ # Exports both String and Number as above. ​ # ​ use Types::Mine qw( String Number ); ​ ​ # Same. ​ # ​ use Types::Mine qw( :types ); ​ ​ # Exports "coerce_String" and "coerce_Number", as well as any other ​ # coercions ​ # ​ use Types::Mine qw( :coercions ); ​ ​ # Exports a sub "is_String" so that "is_String($foo)" is equivalent ​ # to "String−>check($foo)". ​ # ​ use Types::Mine qw( is_String ); ​ ​ # Exports "is_String" and "is_Number". ​ # ​ use Types::Mine qw( :is ); ​ ​ # Exports a sub "assert_String" so that "assert_String($foo)" is ​ # equivalent to "String−>assert_return($foo)". ​ # ​ use Types::Mine qw( assert_String ); ​ ​ # Exports "assert_String" and "assert_Number". ​ # ​ use Types::Mine qw( :assert ); ​ ​ # Exports a sub "to_String" so that "to_String($foo)" is equivalent ​ # to "String−>coerce($foo)". ​ # ​ use Types::Mine qw( to_String ); ​ ​ # Exports "to_String" and "to_Number". ​ # ​ use Types::Mine qw( :to ); ​ ​ # Exports "String", "is_String", "assert_String" and "coerce_String". ​ # ​ use Types::Mine qw( +String ); ​ ​ # Exports everything. ​ # ​ use Types::Mine qw( :all ); Type libraries automatically inherit from Exporter::Tiny; see the documentation of that module for tips and tricks importing from libraries.
BUGSPlease report any bugs to <https://github.com/tobyink/p5−type−tiny/issues>.
SEE ALSOType::Tiny::Manual. Type::Tiny, Type::Utils, Types::Standard, Type::Coercion. Moose::Util::TypeConstraints, Mouse::Util::TypeConstraints.
AUTHORToby Inkster <tobyink@cpan.org>.
COPYRIGHT AND LICENCEThis software is copyright (c) 2013−2014, 2017−2021 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.
DISCLAIMER OF WARRANTIES​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. 0
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