Re: Remove Luabind ownership on C++ pointer?

Yeah, my bad, free function is what I meant. Thanks for the correction :)

On Thu, Sep 30, 2010 at 3:06 PM, Nigel Atkinson <[email protected]>wrote:

> A factory function works well, and also works well for singleton classes
> or other times where you need more control over creation and deletion.
>
> In order to use them however, you have to bind them as a static (either
> free or a method), so that you don't need a existing object to call it
> on.
>
> e.g
> // Free style
> module(lua)
> [
>        class_<Object>("Object"),
>        def("CreateObject", &CreateObject)
> ];
>
> // Method style
> module(lua)
> [
>        class_<Object>("Object")
>         .scope
>        [
>                def("Create", &CreateObject)
>        ]
> ];
>
> obj = CreateObject()    // Free function
>
> obj = Object.Create()   // Static method, notice the '.'
>
>
>
> On Thu, 2010-09-30 at 14:26 +0200, Iliya Trendafilov wrote:
> > Another option is to register a factory function instead of
> > constructor. E.g.
> >
> > C++
> > Object* CreateObject() { return new Object(); }
> >
> >
> > module(lua)
> >
> > [
> >
> >                     class_<Object>("Object")
> >
> >                     .def("CreateObject", &CreateObject)
> >
> >
> > ];
> >
> >
> >
> > Lua:
> >
> > local object = CreateObject();
> >
> >
> > You'll be solely responsible for deleting these objects in that case.
> >
> >
> > Another thing I did once is to keep a Lua table with all created
> > instances. In Lua:
> >
> >
> > function CreateObject(...)
> >
> >       objects = objects or {}
> >
> >
> >       local object = Object()
> >
> >       table.insert(objects, object)
> >
> >
> >       return object
> >
> >
> > end
> >
> >
> > and then create all your instances through that function.
> >
> >
> > I'll leave you to decide which of the methods is the most elegant :)
> >
> >
> >
> > On Thu, Sep 30, 2010 at 1:30 PM, eduard mueller
> > <[email protected]> wrote:
> >         Hold the object in a boost::shared_ptr or some other reference
> >         counting smart_ptr in Lua:
> >         class_<Object, boost::shared_ptr<Object> >("Object")
> >
> >         Then the object will be kept alive as long as another
> >         shared_ptr uses
> >         the object in C++. Aka, the instance that is created in Lua
> >         will only
> >         release the shared pointer, not destruct the object itself
> >         when
> >         garbage collected.
> >
> >         Best regards,
> >         Eduard
> >
> >
> >
> >         On Thu, Sep 30, 2010 at 05:16, neosettlers
> >         <[email protected]> wrote:
> >         > Greetings,
> >         >
> >         >
> >         >
> >         > I’m wondering how to remove Luabind ownership on C++
> >         pointers:
> >         >
> >         >
> >         >
> >         > C++
> >         >
> >         > module(lua)
> >         >
> >         > [
> >         >
> >         >                     class_<Object>("Object")
> >         >
> >         >                     .def(constructor<>())
> >         >
> >         > ];
> >         >
> >         >
> >         >
> >         > .lua
> >         >
> >         > local object = Object();
> >         >
> >         >
> >         >
> >         > …
> >         >
> >         >
> >         >
> >         > I would like Luabind NOT to delete the object C++ pointer
> >         when lua_gc() is
> >         > called.
> >         >
> >         >
> >         >
> >         > If anyone found an elegant solution for this, I’m definitely
> >         interested to
> >         > hear about it.
> >         >
> >         >
> >         >
> >         > Thx,
> >         >
> >         >
> >         >
> >         >
> >         >
> >
> >         >
> >
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> >
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