Type::Registry(3) User Contributed Perl Documentation Type::Registry(3)
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(3).
AUTHOR
Toby Inkster <tobyink@cpan.org>.
COPYRIGHT AND LICENCE
This software is copyright (c) 2013-2014, 2017-2025 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.
perl v5.34.3 2025-09-02 Type::Registry(3)
type-tiny 2.8.3 - Generated Thu Sep 4 14:52:49 CDT 2025