Mine

struct lua_wrapper_CBaseEntity : CBaseEntity, luabind::wrap_base
{
    lua_wrapper_CBaseEntity(  bool bServerOnly=false )
        : CBaseEntity(bServerOnly) 
    {}

    virtual void Spawn(int a) 
    { 
        call<void>("Spawn"); 
    }

    static void default_spawn(CBaseEntity* ptr)
    {
		return ptr->CBaseEntity::Spawn();
    }
};