Class::Virtually::Abstract - Compile-time enforcement of Class::Virtual
| Use Case | Code/Usage | Description |
|---|---|---|
| Declare virtual methods | __PACKAGE__->virtual_methods(qw(new foo bar this that)); |
Define which methods subclasses must implement |
| Create a virtual base class | use base qw(Class::Virtually::Abstract); |
Inherit from Class::Virtually::Abstract |
| Implement virtual methods | sub foo { ... } |
Subclass must implement all declared virtual methods |
| Compile-time enforcement | use My::Private::Idaho; |
Fails to compile if any virtual method is missing |
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;
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.
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 AT pobox.com>
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