Eiffel's ability to selectively export class methods in Ruby

I am trying to simulate Eiffel’s ability to make methods in a class only
available to specific other classes. I know it is probably impossible to
make methods only visible to certain other classes, but is there a way
to make a class throw an exception if called by the wrong class?

For instance:

class Foo
def bar
if calling_class.class != some_other_class.class
raise An_Entry_Exception.new
end
â?¦rest of class
end
end

Specifically is there a way to see what the class of whatever is calling
a method is (like the variable ‘calling_class’ above)? Or does anyone
know of a project that simulates this functionality?

On Jul 2, 2006, at 3:30 PM, kevin kinnett wrote:

def bar
know of a project that simulates this functionality?


Posted via http://www.ruby-forum.com/.

Google Binding.of_caller. It’s an evil hack. Good luck.

On Mon, 3 Jul 2006, kevin kinnett wrote:

    raise An_Entry_Exception.new
 end
 â?¦rest of class

end
end

Specifically is there a way to see what the class of whatever is calling
a method is (like the variable ‘calling_class’ above)? Or does anyone
know of a project that simulates this functionality?

class Foo
def bar
unless [One, Two, Three].include? self.class
raise An_Entry_Exception.new
end
end
end

-a

Or does anyone know of a project that simulates this functionality?

Yes, see:

http://www.rcrchive.net/rcr/show/198
http://raa.ruby-lang.org/project/pubsub

Dan Amelang

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