Callbacks.

[Reyn Vlietstra <reyn@...>]

Hi.

I'm new to lua. I'd like to do the following:
From lua, call a C function, with a lua function as one of the 
parameters, eg.

RegisterLuaFunction(ptr,object.func,10)
[ptr is pointer to a C++ object' instance, 10 is a future time in ms]

That C function will then put the function on a std::priority_queue<> to 
be called later.
I'v read that the registry would help out here, the problem is what 
should I use
as a unique key for that ?(because the function can be on the queue more 
than once,
I cant simply use the lua_topointer of the table)

What I would like to do is:  Instead of placing the funcion on the 
registry, use
(void*) var = lua_topointer(L,place where function is) and store that 
somewhere.
The problem is, there isnt a lua_tofunction, so I cant put that back on 
the stack
and call the function. This would have been nice because then I wouldnt 
need to
access another table(registry) to find my function.[lots of 
misconceptions in that paragraph?]

The other alternative is to make a priority queue in lua and do all my 
stuff there, would
you recommend doing this ? (Its just looping through and calling all the 
functions in it,
up to the current time, tho C performance would be nice)

I'm using lua 5.

Thanks !
--
Reyn Vlietstra.