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I'm pretty sure the 'No such operator defined' error is coming from luabind, as the userdata I'm running this on comes from a luabind created object.

If I temporarily remove the __tostring metamethod, the error goes away, so that solves my problem.

Another thing luabind does is override the __eq metamethod, to what it thinks == should be, which is a somewhat complicated definition.  What if I want to compare two userdata objects solely based on whether the references are equal?

On 5/21/07, Peter Odding <> wrote:
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

    Lua 5.1.2  Copyright (C) 1994-2007, 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