Overridden properties are overwritten by base classes

[Chris Byrne-5]

We just encountered a problem where the base classes property getter/setter is called instead of the overridden bindings:

// bind our classes
struct Base {
        std::string GetBase( ) const { return "Base::Get"; }
        void SetBase( const std::string& ) { throw "Base::Set"; }
};
struct Derived : public Base {
        std::string GetDerived( ) const { return "Derived::Get"; }
        void SetDerived( const std::string& ) { throw "Derived::Set"; }
};

// expose them with luabind
{
        using namespace luabind;
       
        module( lua_state ) [
                class_< Base >( "_Base" )
                        .property( "value", &Base::GetBase, &Base::SetBase )
                ,
                class_< Derived, Base >( "_Derived" )
                        .property( "value", &Derived::GetDerived, &Derived::SetDerived )
        ];
}

// bind them as global lua objects
luabind::object obj_globals = luabind::globals( lua_state );

obj_globals[ "base" ] = Base( );
obj_globals[ "derived" ] = Derived( );



-- in lua:

> print( base.value )
Base::Get
> print( derived.value )
Base::Get
-- should be Derived::Get

> base.value = ""
Base::Set
> derived.value = ""
Base::Set
-- should be Derived::Set

========================================================

Problem is due to class_rep::add_base_class being called _after_ the derived properties have been added to m_getters and m_setters. Which is fine except that add_base_class doesn't check if the properties have already been set...

Small diff attached showing how to fix this problem.


Thanks,
 Chris Byrne
 Software Engineer
 Element Labs, Inc.



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