Albert Michauer > namespace > namespace

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NAME ^

namespace - Perl pragma to use like C++ namespace aliasing

SYNOPSIS ^

 use namespace File => IO::File;

 my $fh = new File "foo", O_CREAT|O_WRONLY;
 if( defined $fh )
 {
     print $fh "bar\n";
     $fh->close;
 }

DESCRIPTION ^

Allow aliasing namespace. May be useful for reusability increase.

 use namespace ALIAS => PACKAGE 
    [, qw/IMPORT_LIST [ ::SUBPACKAGE [ IMPORT_LIST ]] /];

 ALIAS and PACKAGE is required parameters;
 IMPORT_LIST is the usual list of import.

Also may be undefined namespace and they subnamespaces:

 no namespace ALIAS;

If ALIAS begin with '::', then alias will be expandet to caller namespace. If following example of pragma namespace called from main:: module, then alias will be expandet to main::ALIAS::.

 use namespace ::ALIAS => PACKAGE

EXAMPLES ^

 EXAMPLE 1

 use namespace DOM => XML::DOM, qw/$VERSION ::Document $VERSION/;

    # DOM is alias for XML::DOM
    #       $VERSION from XML::DOM will be imported to DOM
    #
    # ::Document subpackage of XML::DOM will be aliased to DOM::Document
    #       $VERSION from XML::DOM::Document will be imported to DOM::Document

 my $doc = new DOM::Document;
 print "Current used DOM version is $DOM::VERSION \n";

 no namespace DOM;

    # namespace DOM and all subnamespaces will be destroyed



 EXAMPLE 2

 use namespace DOM => XML::DOM, qw/::Document/;
 # or
 # use namespace DOM => XML::Sablotron::DOM, qw/:constants ::Document/;

 my $doc = new DOM::Document;
 print "Constant 'TEXT_NODE' = ", TEXT_NODE;

AUTHOR ^

Albert MICHEEV <amichauer@cpan.org>

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