Re: Dynamic typing question

Hello John,

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"Casting to more derived type in lua script".
Talking thread has been started 09.11.2008.

Regards,
Serge.



John Smith пишет:
> Is it possible to use the RTTI info to have lua figure out the original 
> type of a sliced object?  IE:
> 
> 
> class BaseObject : public luabind::wrap_base
> {
> 
> };
> 
> class DerivedObject : public BaseObject
> {
> public:
>     int i;
> }
> 
> lua_State* L;
> 
> bool LuaStateMgrImpl::Init()
> {
>     L = lua_open(); 
> 
>     // load the libs 
>     luaL_openlibs(L); 
> 
>     // Add our libs
>     luabind::open(L);
> 
>     luabind::module(L)
>     [
>         luabind::class_<BaseObject >("BaseObject "),
>         luabind::class_<DerivedObject , BaseObject >("DerivedObject ")
>             .def(luabind::constructor<>())
>             .def_readwrite("i", &DerivedObject ::i)
> 
>     ];
> }
> 
> void GenericCall( const char* pszFunctionCall, BaseObject &o1, 
> BaseObject &o2 )
> {
>     luabind::call_function<void>(L, pszFunctionCall, &o1, &o2);
> }
> 
> void callsomething()
> {
>     DerivedObject do1;
>     do1.i = 5;
>     DerivedObject do2;
>     GenericCall("SomeFunc", do1, do2);
>     cout << do2.i;
> }
> 
> lua:
> function SomeFunc( do1, do2)
>     print (do1.i)
>     do2.i = 3
> end
> 
> Obviously the goal is to have standard out show:
> 5
> 3
> 
> Is there a way to handle this via RTTI or another mechanism, otherwise, 
> what's the best practice for some kind of generic call function?
> 
> 
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------------------------------------------------------------------------------
Open Source Business Conference (OSBC), March 24-25, 2009, San Francisco, CA
-OSBC tackles the biggest issue in open source: Open Sourcing the Enterprise
-Strategies to boost innovation and cut costs with open source participation
-Receive a $600 discount off the registration fee with the source code: SFAD
http://p.sf.net/sfu/XcvMzF8H
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