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- Subject: lreflib
- From: "andre_leiradella" <leiradella@...>
- Date: Mon, 08 Jul 2002 20:25:42 -0000
I wrote a small library to add some functionality I was missing to
Lua. It basically exposes some dangerous Lua API functions to the
language, but I thought someone else could find a use for it:
>From the README file:
This library exposes the lua API functions lua_ref, lua_getref,
lua_unref, lua_settag (for user data) and lua_settagmethod (for "gc"
events) to lua programs. IT IS POTENTIALY DANGEROUS to let end users
build programs using those functions:
. Referenced objects are not garbage-collected unless they are
explicitly unreferenced with unref();
. Changing the tag of userdata can make your program crash (i.e.
calling a socket function with a regex userdata);
. Assigning the reference being garbage collected to another variable
can make your program crash (I think it's safe to do it with the
. References are not tagged so any userdata can be passed to getref
The lua functions provided by this library are:
. newref(obj): returns a reference to obj via a call to lua_ref;
. getref(ref): returns the referenced object or nil on error;
. unref(ref): clears the reference;
. setudtag(ud,tag): sets the tag for the given userdata;
. setgctagmethod(tag,func): sets the gc tag method for the tag and
returns the old tag method.
Please send questions/comments/bugs. Have fun!
Andre de Leiradella