# phpman > perldoc > Specio::Constraint::Structured

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

## VERSION
    version 0.47

## SYNOPSIS
        my $tuple = t('Tuple');

        my $tuple_of_str_int = $tuple->parameterize( of => [ t('Str'), t('Int') ] );

        my $parent = $tuple_of_str_int->parent; # returns Tuple
        my $parameters = $arrayref_of_int->parameters; # returns { of => [ t('Str'), t('Int') ] }

## DESCRIPTION
    This class implements the API for structured 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::Structured](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AConstraint%3A%3AStructured/markdown)->new(...)
    This class's constructor accepts two additional parameters:

    *   parent

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

        This parameter is required.

    *   parameters

        This is the hashref of parameters for the structured type. These are the parameters returned
        by the "Structurable" type's "parameterization_args_builder". The exact form of this hashref
        will vary for each structured type.

        This parameter is required.

  $type->parameters
    Returns the hashref 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.