Re: Registry and references

[Romulo Bahiense <romulo@...>]

> I wonder and ask myself whether the address of a C object isn't, in the
> end, exactly that: an integer key?!

Yes, a pointer is a integer value, in C. In Lua, numbers and 
lightuserdata are different things. A number is (usually) a double 
floating point value, while a lightuserdata is an opaque pointer. The 
struct describing both have different tags (LUA_TNUMBER / 
LUA_TLIGHTUSERDATA).

In the same sense, an string containing four bytes could be an (32bit) 
integer as well.

In other words: there will be no collision between a numeric key and a 
lightuserdata key.


--rb