Re: Exposing C data via userdata and tables

[DC <dcharno@...>]

> put the C/C++ part as a "private" (light) userdata member in a Lua 
> object (i.e. a table).  Then you can use plain Lua tables, metatables, 
> functions etc. to decorate your Lua object system.  Moreover, the (now 

I am curious how you make the userdata private to the Lua object?

In my first cut at a Lua object system, I have a C factory method which 
creates a Lua table with a metatable of the object's methods.  I 
maintain a weak-key table for the Lua to C mapping and a second fully 
weak table to map from C back to Lua (for events).  Having these two 
association tables feels a bit wrong and slow(?) since I have to do this 
search for each method and attribute access on an object.

It seems like there should be a more direct way, but I was worried that 
scripting could 'disassociate' my C object by directly modifying the 
table.

Also, how do you handle GC?  I thought light userdata and Lua tables can 
not have __gc methods.

Thx