NAME

       Type::Registry - a glorified hashref for looking up type constraints

SYNOPSIS

          package Foo::Bar;

          use Type::Registry;

          my $reg = "Type::Registry"->for_me;  # a registry for Foo::Bar

          # Register all types from Types::Standard
          $reg->add_types(-Standard);

          # Register just one type from Types::XSD
          $reg->add_types(-XSD => ["NonNegativeInteger"]);

          # Register all types from MyApp::Types
          $reg->add_types("MyApp::Types");

          # Create a type alias
          $reg->alias_type("NonNegativeInteger" => "Count");

          # Look up a type constraint
          my $type = $reg->lookup("ArrayRef[Count]");

          $type->check([1, 2, 3.14159]);  # croaks

       Alternatively:

          package Foo::Bar;

          use Type::Registry qw( t );

          # Register all types from Types::Standard
          t->add_types(-Standard);

          # Register just one type from Types::XSD
          t->add_types(-XSD => ["NonNegativeInteger"]);

          # Register all types from MyApp::Types
          t->add_types("MyApp::Types");

          # Create a type alias
          t->alias_type("NonNegativeInteger" => "Count");

          # Look up a type constraint
          my $type = t("ArrayRef[Count]");

          $type->check([1, 2, 3.14159]);  # croaks

STATUS

       This module is covered by the Type-Tiny stability policy.

DESCRIPTION

       A type registry is basically just a hashref mapping type names to type constraint objects.

   Constructors
       "new"
           Create a new glorified hashref.

       "for_class($class)"
           Create or return the existing glorified hashref associated with the given class.

           Note that any type constraint you have imported from Type::Library-based type libraries will be
           automatically available in your class' registry.

       "for_me"
           Create or return the existing glorified hashref associated with the caller.

   Methods
       "add_types(@libraries)"
           The libraries list is treated as an "optlist" (a la Data::OptList).

           Strings are the names of type libraries; if the first character is a hyphen, it is expanded to the
           "Types::" prefix. If followed by an arrayref, this is the list of types to import from that library.
           Otherwise, imports all types from the library.

              use Type::Registry qw(t);

              t->add_types(-Standard);  # OR: t->add_types("Types::Standard");

              t->add_types(
                 -TypeTiny => ['HashLike'],
                 -Standard => ['HashRef' => { -as => 'RealHash' }],
              );

           MooseX::Types (and experimentally, MouseX::Types) libraries can also be added this way, but cannot be
           followed by an arrayref of types to import.

       "add_type($type, $name)"
           The long-awaited singular form of "add_types". Given a type constraint object, adds it to the
           registry with a given name. The name may be omitted, in which case "$type->name" is called, and
           Type::Registry will throw an error if $type is anonymous. If a name is explicitly given,
           Type::Registry cares not one wit whether the type constraint is anonymous.

           This method can even add MooseX::Types and MouseX::Types type constraints; indeed anything that can
           be handled by Types::TypeTiny's "to_TypeTiny" function. (Bear in mind that to_TypeTiny always results
           in an anonymous type constraint, so $name will be required.)

       "alias_type($oldname, $newname)"
           Create an alias for an existing type.

       "simple_lookup($name)"
           Look up a type in the registry by name.

           Returns undef if not found.

       "foreign_lookup($name)"
           Like "simple_lookup", but if the type name contains "::", will attempt to load it from a type
           library. (And will attempt to load that module.)

       "lookup($name)"
           Look up by name, with a DSL.

              t->lookup("Int|ArrayRef[Int]")

           The DSL can be summed up as:

              X               type from this registry
              My::Lib::X      type from a type library
              ~X              complementary type
              X | Y           union
              X & Y           intersection
              X[...]          parameterized type
              slurpy X        slurpy type
              Foo::Bar::      class type

           Croaks if not found.

       "make_union(@constraints)", "make_intersection(@constraints)", "make_class_type($class)",
       "make_role_type($role)"
           Convenience methods for creating certain common type constraints.

       "AUTOLOAD"
           Overloaded to call "lookup".

              $registry->Str;  # like $registry->lookup("Str")

       "get_parent", "set_parent($reg)", "clear_parent", "has_parent"
           Advanced stuff. Allows a registry to have a "parent" registry which it inherits type constraints
           from.

   Functions
       "t" This class can export a function "t" which acts like ""Type::Registry"->for_class($importing_class)".

BUGS

       Please report any bugs to <https://github.com/tobyink/p5-type-tiny/issues>.

SEE ALSO

       Type::Library.

AUTHOR

       Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

       This software is copyright (c) 2013-2014, 2017-2023 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.