[Date Prev][Date Next][Thread Prev][Thread Next]
- Subject: Re: Unified tables and userdata
- From: Mark Hamburg <mhamburg@...>
- Date: Sat, 16 Oct 2004 17:27:37 -0700
on 10/14/04 2:02 PM, Rici Lake at firstname.lastname@example.org wrote:
>> More importantly make these metamethods *always* override default
>> ones. This
>> is the simplest and most general way on which everything else can be
>> and concerns index/newindex AFAIK. I can see no reason for their
>> behaviour which requires a trick to bypass.
> The current behaviour is more efficient and often exactly what is being
> looked for, particularly in the case of __index. (In the case of
> __newindex, the point is arguable.) The use of a proxy table is not
> really a "trick"; it is a Lua idiom :) Of course, metatables applied to
> userdata already do exactly what you want.
Or more explicitly, always calling through __index interferes with
implementing schemes that provide simple, prototype-based inheritance
I don't know what the case is for the behavior of __newindex.
The unfortunate thing about proxy tables is that they break for many other
operations such as iteration, insertion, etc. unless one knows that one is
dealing with a proxy table and uses different operations.