Re: Casting Upvalues to luabind specific objects?

I got a bit further - i now know the luabind object at least

luabind::detail::object_rep* obj = static_cast<luabind::detail::object_rep*>(lua_touserdata(fn.interpreter(),2));
					            luabind::detail::class_rep* rep = obj->crep(); 
								if (rep != NULL) {									
									printf("My Class Name is %s \n",rep->name());
								}

So - how do i get my original class object form object_rep ?

Why does rep->name() gives me the implemented class name and not the abstract interface i exposed (which my implemented class extends) e.g. IActor exposed to lua with luabind, MyActor is my actual class which implements it


--- On Tue, 1/29/13, Harakiri <[email protected]> wrote:

> From: Harakiri <[email protected]>
> Subject: [luabind] Casting Upvalues to luabind specific objects?
> To: [email protected]
> Date: Tuesday, January 29, 2013, 10:03 AM
> Before executing a lua function i
> like to see/modify the upvalues (basically globally/locally
> accessible vars)
> 
> I'm able to retrieve and print them from C++
> 
> // lua func to call is on stack of luastate
> const char* name = NULL;
>                 int
> j = 1;
>                
> while((name = lua_getupvalue(fn.interpreter(), -1, j)) !=
> NULL) {
>                
>         std::cout << name <<
> std::endl;             
>              
>                
>         std::cout <<  " "
> << lua_typename(fn.interpreter(),
> lua_type(fn.interpreter(),2)) << std::endl;
>                
>            
>                
>         if(lua_type(fn.interpreter(),2)
> == LUA_TUSERDATA) {
>                
>                 //
> lua_touserdata(fn.interpreter(),2);
>                
>            
>    
>                
>         }
> 
>                
>        
>                
>         lua_pop(fn.interpreter(),
> 1);           
>                
>         j++;
>                
>        
>                 }
> 
> 
> Now what object type is my userdata here ? It is luabind
> specific - because i printed the address from C and in lua i
> did a toString() which i implemented in my exposed Class to
> print the this ptr value.
> 
> I know there is a luabind specific upvalue handler but i
> have no idea how to use it. And the documentation is
> lacking
> 
> Questions:
> 
> What is the userdata object class that luabind uses to
> expose objects in scripts?
> 
> How can i retrieve the classname from the original object
> from that luabind object? So that i know how to cast the
> luabind object to my own object type.
> 
> Anyone able to modify the above code to set some upvalues
> for a function to NIL ? I tried lua_setupvalue but there is
> no good documentation about it - i was able todo it just
> fine from lua with 
> local func = debug.getinfo(2, "f").func
> debug.setupvalue(func, <idxofupvalue>,
> <newvalue>);
> 
> Thanks
> 
> 
> 
> 
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MVPs and experts. ON SALE this month only -- learn more at:
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