[luabind] How to get the attributes of a lua class without their names, using luabind

[Thibault E. <thi...@gm...>]

Hello everyone,

I have a Lua class (defined using luabind's 'class' keyword) and I'd like
to get the value of the attributes defined in Lua, with C++.

In the code below, I've defined a class, created an instance "foo" and set
a custom attribute "bar" to that instance. Finally, I am calling a C++
function which has to print the attributes of the instance passed as a
parameter.

Here's the Lua code :

    class 'MyLuaClass'
    function MyLuaClass:__init() end

    foo = MyLuaClass()
    foo.bar = "baz";
    PrintAttributes(foo);

And now the C++ code of the PrintAttributes function, obj is a class
instance:

    void PrintAttributes(luabind::object &obj)
    {
        // Direct access works
        std::cout << obj["bar"] << std::endl; // Will print "baz" :-)

        // But what if I don't know the name of the variable(s)?
        for (luabind::iterator it(obj); it != luabind::iterator(); ++it)
        {
            // Doesn't work since obj is an userdata
        }
    }

I've also tried to use class_info but it only works with properties defined
in a C++ class. Is there a way to access those defined with Lua?

Regards,