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Old 05-13-2004
Linux Virtual Memory Book
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Last edited by Driver; 10-23-2004 at 12:07 AM..
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LEARN ABOUT DEBIAN

class::virtually::abstract

Class::Virtually::Abstract(3pm) 			User Contributed Perl Documentation			   Class::Virtually::Abstract(3pm)

NAME

       Class::Virtually::Abstract - Compile-time enforcement of Class::Virtual

SYNOPSIS

	 package My::Virtual::Idaho;
	 use base qw(Class::Virtually::Abstract);

	 __PACKAGE__->virtual_methods(qw(new foo bar this that));

	 package My::Private::Idaho;
	 use base qw(My::Virtual::Idaho);

	 sub new { ... }
	 sub foo { ... }
	 sub bar { ... }
	 sub this { ... }
	 # oops, forgot to implement that()!!  Whatever will happen?!

	 # Meanwhile, in another piece of code!
	 # KA-BLAM!  My::Private::Idaho fails to compile because it didn't
	 # fully implement My::Virtual::Idaho.
	 use My::Private::Idaho;

DESCRIPTION

       This subclass of Class::Virtual provides compile-time enforcement.  That means subclasses of your virtual class are required to implement
       all virtual methods or else it will not compile.

BUGS and CAVEATS
       Because this relies on import() it is important that your classes are used instead of required.	This is a problem, and I'm trying to
       figure a way around it.

       Also, if a subclass defines its own import() routine (I've done it) Class::Virtually::Abstract's compile-time checking is defeated.

       Got to think of a better way to do this besides import().

AUTHOR

       Original idea and code from Ben Tilly's AbstractClass http://www.perlmonks.org/index.pl?node_id=44300&lastnode_id=45341

       Embraced and Extended by Michael G Schwern <schwern@pobox.com>

SEE ALSO

       Class::Virtual

perl v5.10.1							    2007-10-23					   Class::Virtually::Abstract(3pm)