Re: Luabind and passing classes

Thanks I spent a bit and got what I wanted working sort of.  How do you
you return strings from a exposed function?  I got the exposing working
fine and I can pass a string as a parameter but how do I get it as a
result. the class (part of testing) is

class TestClass {
    std::string myString;
public:
    TestClass() {
        myString = "Not Initalized";
    }
    TestClass( const char* aString ) {
        myString = std::string(aString);
    }
    void setString( const char* aString ) {
        myString = std::string(aString);
    }
    const char* getString( void ) {
        return myString.c_str();
    }
    void printString( void ) {
        std::cout << myString << std::endl;
    }
    static void configureLuaObject(lua_State* lVM) {
        luabind::module(lVM) [
            luabind::class_<TestClass>("TestClass")
                .def(luabind::constructor <> ())
                .def(luabind::constructor<const char*>())
                .def("setString", &TestClass::setString)
                .def("getString", &TestClass::getString)
                .def("printString", &TestClass::printString)
        ];
    }
    void callFunction(lua_State* lVM) {
        luabind::call_function<void>(lVM, "AFunction",
boost::ref(this));
    }
};

getString throws an error when run.
					Nathaniel

On Thu, 2010-07-22 at 13:40 +1200, Nigel Atkinson wrote:
> Hi Nathaniel,
> 
> Short answer: Yes.
> 
> If you bind a class using Luabind it can be passed to Lua functions as
> a parameter.  When you bind a class you do not need to bind the
> class's constructor.  Omitting the constructor prevents your Lua
> script from being able to instantiate that particular class, however
> Lua can otherwise use instances passed to it from C++.
> 
> I do this quite often with singleton classes.
> 
> Nigel Atkinson
> 
> On Wed, 2010-07-21 at 16:53 -0700, Nathaniel Lewis wrote: 
> > I was reading through some tutorials and I had a question unanswered.
> > How do I pass a specific class to Lua?  I have a class that represents a
> > world in my game engine and I need some way to talk with it from Lua.  I
> > think LuaBind is the answer but I don't know.  I would never want to
> > create the class from Lua.  Instead I would want to pass a reference to
> > the one created on the c++ side to Lua and then call functions inside of
> > it.  Is this possible with LuaBind?  Basically a simple script would
> > look like this
> > 
> > -- called when map is loaded by engine --
> > function Init (worldInstance) 
> >     -- do stuff --
> > end
> > 
> > -- called after every frame is rendered --
> > Update = coroutine.wrap( function (worldInstance, timeSinceLastFrame)
> >     while true do
> > 	-- do stuff + call coroutine.yield() when waiting for things --
> >     end
> > end)
> > 						Nathaniel
> > 
> > 
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