K 10
svn:author
V 7
sunpoet
K 8
svn:date
V 27
2012-07-30T19:22:48.678004Z
K 7
svn:log
V 775
- Add p5-Safe-Isa 1.000002

Since Perl allows us to provide a subroutine reference or a method name to the
-> operator when used as a method call, and a subroutine doesn't require the
invocant to actually be an object, we can create safe versions of isa, can and
friends by using a subroutine reference that only tries to call the method if
it's used on an object.

e.g. my $isa_Foo = $maybe_an_object->$_call_if_object(isa => 'Foo');

Note that we don't handle trying class names, because many things are valid
class names that you might not want to treat as one (like say "Matt") - the
is_module_name function from Module::Runtime is a good way to check for
something you might be able to call methods on if you want to do that.

WWW: http://search.cpan.org/dist/Safe-Isa/

END