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Author image 加藤敦


ExportTo - export any function/method to any namespace


Version 0.03


 package From;
 sub function_1{
   # ...
 sub function_2{
   # ...
 sub function_3{
   # ...
 use ExportTo (NameSpace1 => [qw/function_1 function_2/], NameSpace2 => [qw/function_3/]);

 # Now, function_1 and function_2 are exported to 'NameSpace1' namespace.
 # function_3 is exported to 'NameSpace2' namespace.
 # If 'NameSpace1'/'NameSpace2' namespace has same name function/method,
 # such a function/method is not exported and ExportTo croaks.
 # but if you want to override, you can do it as following.
 use ExportTo (NameSpace1 => [qw/+function_1 function_2/]);
 # if adding + to function/method name,
 # This override function/method which namespace already has with exported function/method.
 use ExportTo ('+NameSpace' => [qw/function_1 function_2/]);
 # if you add + to namespace name, all functions are exported even if namespace already has function/method.

 use ExportTo ('+NameSpace' => {function_ => sub{print 1}, function_2 => 'function_2'});
 # if using hashref instead of arrayref, its key is regarded as subroutine name and
 # value is regarded as its coderef/subroutine name. and this subroutine name will be exported.


This module allow you to export/override subroutine/method to one namespace. It can be used for mix-in, for extension of modules not using inheritance.


 # example 1 & 2
 export_to(PACKAGE_NAME => [qw/FUNCTION_NAME/]);
 ExportTo->export_to(PACKAGE_NAME => [qw/FUNCTION_NAME/]);
 # example 3
 ExportTo->export_to(PACKAGE_NAME => {SUBROUTINE_NAME => sub{ .... }, SUBROUTINE_NAME2 => 'FUNCTION_NAME'});

These are as same as following.

 # example 1 & 2
 use ExportTo(PACKAGE_NAME => [qw/FUNCTION_NAME/]);
 # example 3

But, 'use' is needed to declare after declaration of function/method. using 'export_to', you can write anywhere.

Export from another package to another package (with renaming).

This is used in Util::Any. For example, CGI::Util's escape function to other package.

 package main;
 use CGI ();
 # export CGI::Util::escape to OtherA
 use ExportTo (OtherA => ['CGI::Util::escape']);
 # export CGI::Util::escape to OtherB as cgi_escape
 use ExportTo (OtherB => {cgi_escape => \&CGI::Util::escape});
 print OtherA::escape("/"); # %2F
 print OtherB::cgi_escape("/"); # %2F

Import from another package's subroutine to current package (with renaming)

It is as same as above.

 use CGI ();
 # export CGI::Util::escape to current package
 use ExportTo (__PACKAGE__, ['CGI::Util::escape']);
 # export CGI::Util::escape to current package as cgi_escape
 use ExportTo (__PACKAGE__, {cgi_escape => \&CGI::Util::escape});
 print main::escape("/"); # %2F
 print main::cgi_escape("/"); # %2F

But for this purpose, Sub::Import has better interface.


Ktat, <ktat at cpan.org>


Please report any bugs or feature requests to bug-exportto at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=ExportTo. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.


You can find documentation for this module with the perldoc command.

    perldoc ExportTo

You can also look for information at:


Sub::Import. If you import other module's function to current package, it is better than ExportTo.


Copyright 2006-2009 Ktat, all rights reserved.

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