# info > Specio::Exporter

## Specio::[Exporter(3pm)](https://www.chedong.com/phpMan.php/man/Exporter/3pm/markdown) User Contributed Perl DocumentationSpecio::[Exporter(3pm)](https://www.chedong.com/phpMan.php/man/Exporter/3pm/markdown)

## NAME
       [Specio::Exporter](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AExporter/markdown) - Base class for type libraries

## VERSION
       version 0.47

## SYNOPSIS
           package [MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown);

           use parent '[Specio::Exporter](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AExporter/markdown)';

           use [Specio::Declare](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ADeclare/markdown);

           declare( ... );

           # more types here

           package [MyApp::Foo](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AFoo/markdown);

           use [MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown)

## DESCRIPTION
       Inheriting from this package makes your package a type exporter. By
       default, types defined in a package are never visible outside of the
       package. When you inherit from this package, all the types you define
       internally become available via exports.

       The exported types are available through the importing package's "t"
       subroutine.

       By default, types your package imports are not re-exported:

         package [MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown);

         use parent '[Specio::Exporter](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AExporter/markdown)';

         use [Specio::Declare](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ADeclare/markdown);
         use [Specio::Library::Builtins](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ALibrary%3A%3ABuiltins/markdown);

       In this case, the types provided by [Specio::Library::Builtins](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ALibrary%3A%3ABuiltins/markdown) are not
       exported to packages which "use [MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown)".

       You can explicitly ask for types to be re-exported:

         package [MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown);

         use parent '[Specio::Exporter](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AExporter/markdown)';

         use [Specio::Declare](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ADeclare/markdown);
         use [Specio::Library::Builtins](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ALibrary%3A%3ABuiltins/markdown) -reexport;

       In this case, packages which "use [MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown)" will get all
       the types from [Specio::Library::Builtins](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ALibrary%3A%3ABuiltins/markdown) as well as any types defined
       in "[MyApp::Type::Library](https://www.chedong.com/phpMan.php/perldoc/MyApp%3A%3AType%3A%3ALibrary/markdown)".

## ADDITIONAL EXPORTS
       If you want to export some additional subroutines from a package which
       has "[Specio::Exporter](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3AExporter/markdown)" as its parent, define a sub named
       "_also_export". This sub should return a list of subroutines defined in
       your package that should also be exported. These subs will be exported
       unconditionally to any package that uses your package.

COMBINING LIBRARIES WITH [Specio::Subs](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ASubs/markdown)
       You can combine loading libraries with subroutine generation using
       [Specio::Subs](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ASubs/markdown) by using "_also_export" and
       "[Specio::Subs::subs_installed_into](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ASubs%3A%3Asubsinstalledinto/markdown)":

           package [My::Library](https://www.chedong.com/phpMan.php/perldoc/My%3A%3ALibrary/markdown);

           use [My::Library::Internal](https://www.chedong.com/phpMan.php/perldoc/My%3A%3ALibrary%3A%3AInternal/markdown) -reexport;
           use [Specio::Library::Builtins](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ALibrary%3A%3ABuiltins/markdown) -reexport;
           use [Specio::Subs](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ASubs/markdown) qw( [My::Library::Internal](https://www.chedong.com/phpMan.php/perldoc/My%3A%3ALibrary%3A%3AInternal/markdown) [Specio::Library::Builtins](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ALibrary%3A%3ABuiltins/markdown) );

           sub _also_export {
               return [Specio::Subs::subs_installed_into](https://www.chedong.com/phpMan.php/perldoc/Specio%3A%3ASubs%3A%3Asubsinstalledinto/markdown)(__PACKAGE__);
           }

## 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.

perl v5.32.0                      2021-01-31             Specio::[Exporter(3pm)](https://www.chedong.com/phpMan.php/man/Exporter/3pm/markdown)