Re: Pushing a UserData pointer?

[Rici Lake <lua@...>]

On 16-May-05, at 2:36 PM, Chris Marrin wrote:

> Ben Sunshine-Hill wrote:
> > ...
>
> Yes, this is just about the code I came up with (without the erroneous 
> newudata), by patterning after lua_newuserdata(). I am not very happy 
> about subverting Lua like this either, except that I really need the 
> performance boost and I REALLY, REALLY promise that the pointer will 
> always be good :-)

If you don't want to go hacking the Lua core, I have another solution...

You say you're reffing the new userdata anyway; this is going to store 
a reference in the registry. There's no magic to luaL_ref other than 
that. So why not kill two birds with one stone?

Instead of using luaL_ref to store a reference in the registry, store 
your own reference in the registry using a lightuserdata of the  this  
pointer as a key. Then you can push the lua object onto the stack using 
the  this  pointer, without breaking the API and without incurring much 
overhead (since the hash of a lud is essentially the address).

R.