Re: Minimal 4.1 OO

[Roberto Ierusalimschy <roberto@...>]

> First, is there any documentation for 4.1w4 more up to date than
>   http://www.tecgraf.puc-rio.br/lua/work/refman-4.1-work4.pdf

No...

> I just got 4.0 figured out and now would like to know how to port.

Remember that 4.1w4 is a quite unstable version (regarding specs).
Everything there may change.


> tags are gone [...]

They were replaced by metatables. I guess the manual talks about that
already. (Does it?)


> and userdatabox seems to be the giant key.

For creating new objects, newuserdatabox is exactly the same as the
old pushuserdata. (For a "pushusertag", you first create it and then
change its metatable.) The only difference between newuserdatabox
and pushuserdata is that, when Lua already has a userdata with the
same address/tag, pushuserdata coalesces the new userdata with the old
one, while newuserdatabox always creates a new one. When creating new
objects, that situation never happens, so there is no difference between
the two functions.

-- Roberto