From: matz@... (Yukihiro Matsumoto)
Date: 2001-10-08T10:06:02+09:00
Subject: [ruby-talk:22215] Re: Why does Class undefine module_function?

Hi,

In message "[ruby-talk:22211] Re: Why does Class undefine module_function?"
    on 01/10/08, Jeremy Henty <jeremy@chaos.org.uk> writes:

|So the reason is that instance methods of a class may depend on 
|the receiver being of the right class (particularly if they are 
|builtins or extensions that access the underlying C structures) 
|whereas instance methods of a module are agnostic about the class 
|of the receiver (because the module could be included into any 
|class) and so can be invoked on any object without fear?

Yes.  Instance methods of modules agnostic about the TYPE of the
receiver, since modules do not do allocation, their methods cannot
have any assumption for object types.

							matz.