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- Subject: Re: GC or Scope problem?!! (Passing pointer to Lua)
- From: Nelson Wong <gogoneruson@...>
- Date: Mon, 11 Apr 2005 21:06:59 +0900
On Apr 11, 2005 7:24 PM, David Given <email@example.com> wrote:
> On Mon, 2005-04-11 at 18:44 +0900, Nelson Wong wrote:
> > I am having a problem with passing pointer to Lua script.
> > I want to to be able to create a game stage from the scripts.
> I do notice one thing:
> > MyStage * myStage;
> > Script.run("CreateStage", myStage);
> You're passing an uninitialised pointer in here...
Oops, My bad!
This whole thing actually is a part of contructor.
Assume, GameSystem is a class, and Stage is one of the class member of
this class. I am trying to experience if it is possible to moving
entire constructor content into the scripts, yet the owner is the C++.
> > CreateStage = function(stage)
> > stage = MyStage:Create();
> ...which you're never modifying (assign a value to 'stage' will just
> modify the value of the local variable. In fact, because you're never
> returning 'stage' from your function, the value will be thrown away from
> the garbage collector when the function exits.)
> What are you expecting to happen? What is a MyStage, and who do you want
> to own it (C++, or Lua)?
Yes, C++ owns all the objects even though they are created in script's
scope! Is that possible.
Again, it might be a bit too much, but I am trying out the extreme
case, where I want Lua script due with all the creation of the stage
> +- David Given --McQ-+ "There is nothing in the world so dangerous ---
> | firstname.lastname@example.org | and I mean *nothing* --- as a children's story that
> | (email@example.com) | happens to be true." --- Master Li Kao, _The Bridge
> +- www.cowlark.com --+ of Birds_