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Manual Reference Pages  -  CLASS::VIRTUALLY::ABSTRACT (3)

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NAME

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

CONTENTS

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 didnt
  # fully implement My::Virtual::Idaho.
  use My::Private::Idaho;



DESCRIPTION

This subclass of Class::Virtual provides <B>compile-timeB> enforcement. That means subclasses of your virtual class are <B>requiredB> 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 <B>useB>d instead of <B>requireB>d. 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
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perl v5.20.3 CLASS::VIRTUALLY::ABSTRACT (3) 2015-03-01

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