Re: Best way to have table-like fields on userdata
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- Subject: Re: Best way to have table-like fields on userdata
- From: Glenn Maynard <glenn@...>
- Date: 2006年11月28日 14:43:34 -0500
On Tue, Nov 28, 2006 at 10:28:17AM -0800, Brian McCallister wrote:
> What is the best way to support something akin to table like fields
> on userdata, so you can have:
>
> foo.status = 201
> foo:puts("hello world")
I made foo a table, and having a table mapping from tables to their
corresponding (now light) userdatas. That way, foo is a real table,
not something pretending to be one--pairs() and the "function foo:x() end"
syntax works. It does result in more dispatch overhead, since C
functions bound to it need to look up the userdata.
I don't actually use this very much, and may switch to a userdata-
with-table-stashed approach at some point to reduce that overhead,
maybe with table creation being lazy, so I don't pay the memory price
of the table for small objects that never use it.
--
Glenn Maynard