Neil Bowers > Exporter-Lite > Exporter::Lite

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NAME ^

Exporter::Lite - Lightweight exporting of variables

SYNOPSIS ^

  package Foo;
  use Exporter::Lite;

  # Just like Exporter.
  @EXPORT       = qw($This That);
  @EXPORT_OK    = qw(@Left %Right);


  # Meanwhile, in another piece of code!
  package Bar;
  use Foo;  # exports $This and &That.

DESCRIPTION ^

Exporter::Lite is an alternative to Exporter, intended to provide a lightweight subset of the most commonly-used functionality. It supports import(), @EXPORT and @EXPORT_OK and not a whole lot else.

Unlike Exporter, it is not necessary to inherit from Exporter::Lite; Ie you don't need to write:

 @ISA = qw(Exporter::Lite);

Exporter::Lite simply exports its import() function into your namespace. This might be called a "mix-in" or a "role".

Setting up a module to export its variables and functions is simple:

    package My::Module;
    use Exporter::Lite;

    our @EXPORT = qw($Foo bar);

Now, when you use My::Module, $Foo and bar() will show up.

In order to make exporting optional, use @EXPORT_OK:

    package My::Module;
    use Exporter::Lite;

    our @EXPORT_OK = qw($Foo bar);

When My::Module is used, $Foo and bar() will not show up. You have to ask for them.

    use My::Module qw($Foo bar);

Methods ^

Export::Lite has one public method, import(), which is called automatically when your modules is use()'d.

In normal usage you don't have to worry about this at all.

import
  Some::Module->import;
  Some::Module->import(@symbols);

Works just like Exporter::import() excepting it only honors @Some::Module::EXPORT and @Some::Module::EXPORT_OK.

The given @symbols are exported to the current package provided they are in @Some::Module::EXPORT or @Some::Module::EXPORT_OK. Otherwise an exception is thrown (ie. the program dies).

If @symbols is not given, everything in @Some::Module::EXPORT is exported.

DIAGNOSTICS ^

'"%s" is not exported by the %s module'

Attempted to import a symbol which is not in @EXPORT or @EXPORT_OK.

'Can\'t export symbol: %s'

Attempted to import a symbol of an unknown type (ie. the leading $@% salad wasn't recognized).

BUGS and CAVEATS ^

Its not yet clear if this is actually any lighter or faster than Exporter. I know its at least on par.

OTOH, the docs are much clearer and not having to say @ISA = qw(Exporter) is kinda nice.

SEE ALSO ^

Exporter is the grandaddy of all Exporter modules, and bundled with Perl itself, unlike the rest of the modules listed here.

Attribute::Exporter defines attributes which you use to mark which subs and variables you want to export, and how.

Exporter::Simple also uses attributes to control the export of functions and variables from your module.

Const::Exporter makes it easy to create a module that exports constants.

Constant::Exporter is another module that makes it easy to create modules that define and export constants.

Sub::Exporter is a "sophisticated exporter for custom-built routines"; it lets you provide generators that can be used to customise what gets imported when someone uses your module.

Exporter::Tiny provides the same features as Sub::Exporter, but relying only on core dependencies.

Exporter::Shiny is a shortcut for Exporter::Tiny that provides a more concise notation for providing optional exports.

Exporter::Declare provides syntactic sugar to make the export status of your functions part of their declaration. Kind of.

AppConfig::Exporter lets you export part of an AppConfig-based configuration.

Exporter::Lexical lets you export lexical subs from your module.

Constant::Exporter::Lazy lets you write a module that exports function-style constants, which are instantiated lazily.

Exporter::Auto will export everything from your module that it thinks is a public function (name doesn't start with an underscore).

Class::Exporter lets you export class methods as regular subroutines.

Xporter is like Exporter, but with persistent defaults and auto-ISA.

REPOSITORY ^

https://github.com/neilbowers/Exporter-Lite

AUTHORS ^

Michael G Schwern <schwern@pobox.com>

LICENSE ^

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

See http://www.perl.com/perl/misc/Artistic.html

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