# Specio::Exporter - Base class for type libraries - perldoc - [phpMan]

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

## VERSION
    version 0.48

## 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>>.

## 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 - 2022 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.