# perldoc > Specio::Constraint::Parameterized

## NAME
    [Specio::Constraint::Parameterized](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AConstraint%3A%3AParameterized/markdown) - A class which represents parameterized constraints

## VERSION
    version 0.47

## SYNOPSIS
        my $arrayref = t('ArrayRef');

        my $arrayref_of_int = $arrayref->parameterize( of => t('Int') );

        my $parent = $arrayref_of_int->parent; # returns ArrayRef
        my $parameter = $arrayref_of_int->parameter; # returns Int

## DESCRIPTION
    This class implements the API for parameterized types.

## API
    This class implements the same API as [Specio::Constraint::Simple](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AConstraint%3A%3ASimple/markdown), with a few additions.

  [Specio::Constraint::Parameterized](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AConstraint%3A%3AParameterized/markdown)->new(...)
    This class's constructor accepts two additional parameters:

    *   parent

        This should be the [Specio::Constraint::Parameterizable](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AConstraint%3A%3AParameterizable/markdown) object from which this object was
        created.

        This parameter is required.

    *   parameter

        This is the type parameter for the parameterized type. This must be an object which does the
        [Specio::Constraint::Role::Interface](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AConstraint%3A%3ARole%3A%3AInterface/markdown) role.

        This parameter is required.

  $type->parameter
    Returns the type that was passed to the constructor.

## SUPPORT
    Bugs may be submitted at <<https://github.com/houseabsolute/Specio/issues>>.

    I am also usually active on IRC as 'autarch' on "irc://irc.perl.org".

## SOURCE
    The source code repository for Specio can be found at <<https://github.com/houseabsolute/Specio>>.

## AUTHOR
    Dave Rolsky <<autarch@urth.org>>

## COPYRIGHT AND LICENSE
    This software is Copyright (c) 2012 - 2021 by Dave Rolsky.

    This is free software, licensed under:

      The Artistic License 2.0 (GPL Compatible)

    The full text of the license can be found in the LICENSE file included with this distribution.