Deriving inherited classes with Luabind

[Michael Gulak]

So if I have a class structure in C++ as follows

class A
{
   virtual void f();
};

class B : public A
{

};

class C : public B
{

};

And I want to set up a wrapper so I can derive classes from A and B in Lua, how exactly should I go about that?  I can get it to work properly with just the wrapper for A, but I don't know how to do it for the child classes.  If, in the luabind defs, I use luabind::bases<A, WrapperA>, it crashes.  Thanks.
       

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[Michael Gulak]

Seems I misworded my question.  The issue isn't doing the derivation - at least, it may not be.  Turns out I'm not even far enough to know, because I can't call the function I overrode in Lua from C++.  I followed the example from the documentation, and my Lua looks like:

globalone = base()

function globalone:f()
  print("here!")
end

set(newone)

set() just takes a pointer to a base, and sets a global variable in c++ to it.  I then call this in c++:

globalBase->f();

but I get the output from the C++ version of the function.  My bindings are:

    luabind::module(myLuaState)
    [
        luabind::class_<base, base_wrapper>("base")
            .def(luabind::constructor<>())
            .def("f", &base::f, &base_wrapper::default_f),
        luabind::def("set", &set)
    ];

And the class declarations are:

class base
{
public:
    base() { std::cout << "Making a base in C++" << std::endl; }
    virtual void f() { std::cout << "C++ Version" << std::endl; }
};

base* globalBase;

struct base_wrapper : base, luabind::wrap_base
{
    base_wrapper() : base() { std::cout << "Making a base_wrapper in C++" << std::endl; }

    virtual void f() { call<void>("f"); }

    static void default_f(base* ptr) { return ptr->base::f(); }
};

void set(base* ptr)
{
    std::cout << "setting" << std::endl;
    globalBase = ptr;
}

On Sun, Aug 16, 2009 at 10:08 PM, Michael Gulak <michaelgulak@...> wrote:

So if I have a class structure in C++ as follows

class A
{
   virtual void f();
};

class B : public A
{

};

class C : public B
{

};

And I want to set up a wrapper so I can derive classes from A and B in Lua, how exactly should I go about that?  I can get it to work properly with just the wrapper for A, but I don't know how to do it for the child classes.  If, in the luabind defs, I use luabind::bases<A, WrapperA>, it crashes.  Thanks.
       

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