Re: [ANN] Lua 5.4.0 (alpha) now available
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- Subject: Re: [ANN] Lua 5.4.0 (alpha) now available
- From: Andrew Gierth <andrew@...>
- Date: 2019年6月28日 00:24:02 +0100
>>>>> "Dirk" == Dirk Laurie <dirk.laurie@gmail.com> writes:
Dirk> I've been a Lua user for almost ten years, and I've succeeded in
Dirk> understanding and sometimes using every language addition in that
Dirk> time. Not so with <toclose>.
Dirk> My perceptions about it are:
Dirk> 1. It solves a problem encountered by a very small fraction of
Dirk> Lua users.
Maybe so, but it's a problem that lacks other reasonable solutions.
Dirk> 2. Although it looks like a property of a variable, i.e. a name,
Dirk> it is a property of the associated value.
No. This is flat wrong. It is explicitly a property of the variable, and
it is linked to the scope of the variable.
Dirk> 3. All variables declared <toclose> must have a metatable with a
Dirk> __close metamethod, otherwise nothing different happens anyway.
Variables don't have metatables, values do. Values assigned to toclose
variables do need to have this metamethod, yes.
Dirk> 4. Therefore they must be either tables or full userdata.
Correct. So?
--
Andrew.