Re: Pushing a UserData pointer?
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- Subject: Re: Pushing a UserData pointer?
- From: Chris Marrin <chris@...>
- Date: 2005年5月16日 21:03:26 -0700
Rici Lake wrote:
...
Is there another way to avoid the GC problem?
One of us is not being clear :)
You said:
This leaves the userdata on the stack, so my Object ctor fiddles with
it (gives it a common metatable and refs it so it doesn't get GC'ed).
Then it gets popped.
I assumed you meant by "refs it" that you used luaL_ref to create a
reference to it so that it *wouldn't* be collected. Now you seem to be
saying that you *want* it to be collected.
You could do either of those things, as Mark points out, by using both a
weak and a strong table with the weak table backing the strong table via
an __index meta
But perhaps I still don't understand...
You would not be the first to accuse me of obfuscation :-)
What I failed to say is that this ref I add to the object is temporary.
It is there long enough to pop out of all the C++ creation logic and get
back a fully initialized object. This is then handed off to Lua as a
global object or a member of some other table. Then the ref is removed.
After that, I want it to be under GC control like anything else.
Sorry about the confusion...
--
chris marrin ,"",ドル
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