Re: Replacement for unlocked refs?
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- Subject: Re: Replacement for unlocked refs?
- From: Diego Nehab <diego@...>
- Date: 2002年1月31日 15:20:06 -0200 (EDT)
Hi,
> The table *is* the script interface to the object. The table does
> contain a reference to the userdata, in fact it has the *only*
> reference to the userdata, so I must rely on the Lua table to
> determine the lifespan of the object.
>
> I could use the userdata as the object interface in Lua, but then
> every access would have to go look up the associated table, which
> seems worse than reimplementing lua_ref(0) myself.
The methods will have to be looked up in the table anyways. In Lua
4.1-work3, you can create a table with all the methods and set it as the
index field of the eventtable. The call
userdatum:method(...)
will be translated to
userdatum.method(userdatum, ...)
The dot will see its a userdatum and check the eventtable for the userdatum
and return the field 'method' of the index table.
This could be your C function that does whatever it wants with the pointer
it receives.
Even if you don't have eventtables, the method table could be passed as a
closure parameter to the userdatum index tag method.
I don't see how this is too bad. Maybe you need the references outside of C
functions called by lua methods.
Regards,
Diego.