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- Subject: Re: Pushing a UserData pointer?
- From: Chris Marrin <chris@...>
- Date: Mon, 16 May 2005 20:49:29 -0700
Rici Lake wrote:
That's a cool idea. You could even stash a reference count in the
userdata before the actual object itself, and then let Lua do all the
memory management (aside from maintaining the reference count, of
course). That would allow a standard memory management regime for both
shared objects and objects only referenced by Lua.
I'd use a fully-weak table rather than a weak-valued table; it would
have much less impact on gc.
yes, a weak table worked well when I was using it. But it was two table
lookups. Seems to me that a lua_pushuserdata() implementation beats all
that to death (at least in my test cases so far). And, if you use an
opaque handle for the userdata rather than a void*, it can be as type
safe as passing around the lua_State.
I have to say that the trick of combining the userdata with the C++
instance data by overriding the new operator in C++ is incredibly cool.
Now I have one structure that can be used by both C++ and Lua and
lua_pushuserdata() allows it to be totally efficient. Thanks to Ben for
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