Re: Explicit call of C++ destructors from within Lua (Lunar based)

[Hakki Dogusan <dogusanh@...>]

Hi,

Michael Bauroth wrote:
> Hi,
>
> I've made a Lua based GUI application with Lunar binding to the C++ 
> core. The GUI will be constructed in Lua, backed by related C++ classes. 
> Sometimes I build temporary hierarchical structures (e.g. panel with 3 
> buttons), which I want to delete later on.
>
> Now my question: Is it possible to simply call the explicit destructor 
> of such a base node from Lua side (Lunar approach), so that the C++ core 
> can remove the hierarchy or is the only way to set the Lua variable to 
> nil, so that the garbage collection can make the rest?
>
> Unfortunately haven't found something meaningful in the net until now.

General answer to similar questions (closing file, releasing resource, 
etc.) was/is:
- Supply a destroy/delete function to Lua side
- When called, delete C++ side objects, and record that situation (ie. 
ptr=0)
- Let garbage collector do its job whenever it like

For example:

class A {};

class LunarA {
  A* self_;
public:
  LunarA() { self_ = new A; }
  ~LunarA() { delete self_; }
  void destroy(lua_State* L) { delete self_; self_ = 0; }
};



> Best Regards
> Micha

--
Regards,
Hakki Dogusan