Re: lua-5.0: userdata confusion

[Andrzej Borsuk <andrzej.borsuk@...>]

Użytkownik Luiz Henrique de Figueiredo napisał:

> >   * lua_newuserdata() is not what I need, because I already have
> >     allocated memory...

(...)

> If you need uniqueness,
> then create a weak table indexed by your C pointers with values equal 
> to the
> corresponding userdata and only call lua_newuserdata or lua_boxpointer 
> if the
> pointer is not in the table. Note, a WEAK table is needed, otherwise 
> the value
> will never be GC'd.


Thanks, I'll try this... :-)
I did not expect that I will ever need to use weak references..

But.. I have one more question.
(I have tried to find answer in archives but without success)

Lua-4 had simple API with two functions newuserdata and pushusertag, 
lua-5 have now only newuserdata. Why this? In my (maybe stupid) opinion 
it does not conform to KISS rule. This implementation is limited only to 
using malloced memory (no mmap, no shared memory, etc).

Im just courious...

Best regards,
Andrzej Borsuk

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