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- Subject: Re: lists with nil play nice for Lua 5.2
- From: "Aaron Brown" <arundelo@...>
- Date: Sat, 04 Aug 2007 16:17:02 -0400
John Belmonte wrote:
1) no hook for length operator (#) on table or string
This is a wart in Lua's extensibility, and often results
in complex and inefficient workarounds.
And Asko Kauppi wrote (elsewhere in the thread):
Now IF we only can get the '__len' metamethod to be
applied to tables (as it should, in my opinion...).
Maybe having __len be consulted for tables is a good
solution to the problem of sparse tables, but the fact that
it isn't is consistent with the behavior of other
metamethods; e.g., __add isn't consulted for numbers. To
quote myself (page 268 of Beginning Lua Programming):
Metamethods serve mainly to define new behavior, not to
redefine existing behavior. Even the exceptions to that
rule are limited, which is why __eq only works with tables
or full userdatas, and why __newindex and __index only
work with nonexistent keys.
Lua team: what is the downside to making newproxy()
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