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2009/9/1 Juris Kalnins <>:
> Maual says: << Environments associated with userdata have no meaning for
> Lua. It is only a convenience feature for programmers to associate a table
> to a userdata. >>
> Would it be possible to have Udata->env of type GCObject *?
> It seems quite a waste to allocate table just to attach, say, one string to
> a userdata.

When I first used userdata environment I assumed it was the case and
was quite disappointed to discover it's not.

However you have other methods to associate metadata to a userdata.
For example you can use a weak table in the registry, with the
userdata as a weak key and the string as value.