Re: Member pointers in 0.8.1
hymedia <[email protected]>
| Newsgroups | gmane.comp.lang.lua.bind.user |
|---|---|
| Message-ID | <002101c9c52c$8b22b3f0$a1681bd0$@ca> |
Thx for your post Marcus,
When trying to compile this line:
.def("GetObject", (luabind::object(Manager::*)(Name&, lua_State*))
&Manager::GetObjectByName, raw(_2))
I m getting this:
Error 1 error C2664:
'luabind::detail::raw_converter::apply' : cannot convert parameter 2 from
'luabind::detail::by_reference<T>' to 'luabind::detail::by_pointer<T>'
Error 2 error C2664:
'luabind::detail::raw_converter::converter_postcall' : cannot convert
parameter 2 from 'luabind::detail::by_reference<T>' to
'luabind::detail::by_pointer<T>'
Note: Im still using version, 0.8
Hum?
From: Marcus Speight [mailto:[email protected]]
Sent: Friday, April 24, 2009 1:23 PM
To: [email protected]
Subject: Re: [luabind] Member pointers in 0.8.1
Define function to accept the raw state
.def("GetObject", (luabind::object(Manager::*)(Name&, lua_State*))
&Manager::GetObjectByName, raw(_2))
In you base object class add a virtual function called asLua
class Object
{
...
virtual luabind::object asLua(lua_State *L) = 0;
};
The new GetObjectByName function calls the one you already have then calls
the new asLua function
luabind::object Manager::GetObjectByName(Name& n, lua_State *L)
{
Object *obj = GetObjectByName(n);
return obj->asLua(L);
}
In derived classes override the asLua function
class Camera
{
...
virtual luabind::object asLua(lua_State *L) { return
luabind::object(this, L); }
};
The result is the function returns a derived type.
local l_camera = Manager::GetObject(Name("Camera"));
l_camera is of type Camera.
> Date: Fri, 24 Apr 2009 17:19:28 +0000
> From: [email protected]
> To: [email protected]
> Subject: Re: [luabind] Member pointers in 0.8.1
>
>
> I'd be interested in a solution for this as well. What we did as a
workaorund was to add cast functions to the lua bindings for the derived
classes, so you have to know that (in Lua) you receive a Object* and then
convert like this: local actor = Actor.cast(myobject).
> It does feel wrong to introduce casts like this to a dynamic language, but
at least it works. Ultimately, we rewrote part of our project specifically
because of these problems and reimplemented some of the classes in pure lua.
> I really wish luabind was more intelligent and forgiving when it comes to
(smart)pointer casts and general usage.
> Best,
> Tony
>
>
> ----- Ursprüngliche Mail ----
> Von: hymedia <[email protected]>
> An: [email protected]
> Gesendet: Freitag, den 24. April 2009, 19:04:53 Uhr
> Betreff: Re: [luabind] Member pointers in 0.8.1
>
> Greetings,
>
> This might be a no can do but you wizards out there might have an hocus
> pocus workarounds...
>
> Let say the basic function is define like this:
>
> .def("GetObject", (Object*(Manager::*)(Name &)) &Manager::GetObjectByName)
>
> All good, the Manger return an Object, but many classes derived from
Object
> in my C++ and my Luabind Modules follow the same structure. In c++ you can
> statically cast to the desired type... Is there a way to static cast a
> Luabind return value within a Lua script?
>
> Something like:
>
> local l_camera = (Camera*) Manager:GetObject(Name("Camera"));
>
>
> This would work But it is not really sexy...
>
> .def("GetActor", (Actor*(Manager::*)(Name &)) &Manager::GetObjectByName)
> .def("GetCamera", (Camera*(Manager::*)(Name &)) &Manager::GetObjectByName)
>
> thx
>
> -----Original Message-----
> From: Ilia Trendafilov [mailto:[email protected]]
> Sent: Tuesday, April 14, 2009 3:07 PM
> To: [email protected]
> Subject: Re: [luabind] Member pointers in 0.8.1
>
> Problem solved! Thanks!
>
> On Mon, Apr 13, 2009 at 10:16 PM, Daniel Wallin <[email protected]>
wrote:
> > Ilia Trendafilov wrote:
> >> James Porter wrote:
> >>> Your code works for me in Luabind 0.8.1 / Lua 5.1.4 / MSVC8 SP1 with
no
> >>> problems whatsoever. Is your version of Lua up to date, and did you
> >>> compile Luabind via bjam?
> >
> > Really? That's weird. It fails for me on GCC 4.3.2 as well.
> >
> >> Since you can run the code, it seems that I'm doing something wrong,
> >> but I don't have a clue what it might be. Not sure if that's relevant,
> >> boost version is 1.37 on Windows and 1.38 on Linux, built by bjam on
> >> both OSes.
> >
> > Can you try this patch, it should solve the problem:
> > ...
> > Daniel Wallin
> > BoostPro Computing
> > http://www.boostpro.com
>
>
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