Re: [ANN] Lua 5.4.0 (alpha-rc1) now available

[Thijs Schreijer <thijs@...>]

> On 30 May 2019, at 17:43, Roberto Ierusalimschy <roberto@inf.puc-rio.br> wrote:
> 
>> 
>> 
>>> On 30 May 2019, at 02:38, Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> wrote:
>>> 
>>> Lua 5.4.0 (alpha-rc1) is now available for testing at
>>> 	http://www.lua.org/work/lua-5.4.0-alpha-rc1.tar.gz
>> 
>>> From the what I read about “to-be-closed” [1], the difference with an “__gc” method is that is doesn’t wait for the GC cycle to kick in, but it is invoked immediately when the variable goes out-of-scope. So it has deterministic timing over “__gc”.
>> 
>> If this is the case (please correct me if I’m wrong). Then why isn’t it just a flag on a meta-table? The meta table must be there already (since a requirement is to have an __gc method). One could even consider extending “__mode” to carry an extra character; "__mode = ‘kvc’ “.
> 
> What goes out of scope are variables, not values. What get metatables
> are values, not variables.
> 
> -- Roberto
> 

Thx for the explanation, that makes sense.
Thijs