Re: getting address of userdata

[Peter Odding <xolox@...>]

Matthew Armstrong wrote:
> How do I get the address of a userdata object?  This is solely for 
> debugging
> purposes.
>
> For instance, if 't' is a table, and I say:
> print(t)
>
> It will say something like:
> table: 05AED8F0
>
> But, if I try that with a user data object, I get an error saying 'No such
> operator defined'.

I don't know where the message 'No such operator defined' is coming from, but 
the default string representation for userdata in Lua 5.1 already includes an 
address:

   Lua 5.1.2  Copyright (C) 1994-2007 Lua.org, PUC-Rio
   > = newproxy()
   userdata: 00329758
   > = tostring(newproxy())
   userdata: 0032A9F8
   > print(newproxy())
   userdata: 0032ABF0

(I've used newproxy() as an example because it creates a userdata without a 
__tostring() metamethod.)

 - Peter Odding