# phpman > perldoc > Types::TypeTiny

## NAME
    [Types::TypeTiny](https://www.chedong.com/phpMan.php/perldoc/Types%3A%3ATypeTiny/markdown) - type constraints used internally by [Type::Tiny](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ATiny/markdown)

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

## DESCRIPTION
    Dogfooding.

    This isn't a real [Type::Library](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ALibrary/markdown)-based type library; that would involve too much circularity. But
    it exports some type constraints which, while designed for use within [Type::Tiny](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ATiny/markdown), may be more
    generally useful.

### Types
    *   StringLike

        Accepts strings and objects overloading stringification.

    *   HashLike[`a]

        Accepts hashrefs and objects overloading hashification.

        Since [Types::TypeTiny](https://www.chedong.com/phpMan.php/perldoc/Types%3A%3ATypeTiny/markdown) 1.012, may be parameterized with another type constraint like
        HashLike[Int].

    *   ArrayLike[`a]

        Accepts arrayrefs and objects overloading arrayfication.

        Since [Types::TypeTiny](https://www.chedong.com/phpMan.php/perldoc/Types%3A%3ATypeTiny/markdown) 1.012, may be parameterized with another type constraint like
        ArrayLike[Int].

    *   CodeLike

        Accepts coderefs and objects overloading codification.

    *   TypeTiny

        Accepts blessed [Type::Tiny](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ATiny/markdown) objects.

    *   _ForeignTypeConstraint

        Any reference which to_TypeTiny recognizes as something that can be coerced to a [Type::Tiny](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ATiny/markdown)
        object.

        Yes, the underscore is included.

### Coercion Functions
    "to_TypeTiny($constraint)"
        Promotes (or "demotes" if you prefer) a [Moose::Meta::TypeConstraint](https://www.chedong.com/phpMan.php/perldoc/Moose%3A%3AMeta%3A%3ATypeConstraint/markdown) object to a [Type::Tiny](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ATiny/markdown)
        object.

        Can also handle [Validation::Class](https://www.chedong.com/phpMan.php/perldoc/Validation%3A%3AClass/markdown) objects. Type constraints built from [Validation::Class](https://www.chedong.com/phpMan.php/perldoc/Validation%3A%3AClass/markdown)
        objects deliberately *ignore* field filters when they do constraint checking (and go to
        great lengths to do so); using filters for coercion only. (The behaviour of "coerce" if we
        don't do that is just too weird!)

        Can also handle any object providing "check" and "get_message" methods. (This includes
        [Mouse::Meta::TypeConstraint](https://www.chedong.com/phpMan.php/perldoc/Mouse%3A%3AMeta%3A%3ATypeConstraint/markdown) objects.) If the object also provides "has_coercion" and
        "coerce" methods, these will be used too.

        Can also handle coderefs (but not blessed coderefs or objects overloading "&{}"). Coderefs
        are expected to return true iff $_ passes the constraint. If $_ fails the type constraint,
        they may either return false, or die with a helpful error message.

### Methods
    These are implemented so that "[Types::TypeTiny](https://www.chedong.com/phpMan.php/perldoc/Types%3A%3ATypeTiny/markdown)->meta->get_type($foo)" works, for rough
    compatibility with a real [Type::Library](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ALibrary/markdown) type library.

    "meta"
    "type_names"
    "get_type($name)"
    "has_type($name)"
    "coercion_names"
    "get_coercion($name)"
    "has_coercion($name)"

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

## SEE ALSO
    [Type::Tiny](https://www.chedong.com/phpMan.php/perldoc/Type%3A%3ATiny/markdown).

## AUTHOR
    Toby Inkster <<tobyink@cpan.org>>.

## COPYRIGHT AND LICENCE
    This 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.