Function GetDFObject

library/include/LuaTools.h:169–171

     */
    template<df_object T>
    T *GetDFObject(lua_State *state, int val_index, bool exact_type = false) {
        return (T*)GetDFObject(state, df::identity_traits<T>::get(), val_index, exact_type);
    }

    /**
     * Check that the value is a wrapped DF object of the correct type, and if so return the pointer. Otherwise throw an argument type error.