Method lua_insert2

library/include/DataIdentity.h:422–440

            return true;
        }
        virtual bool lua_insert2(lua_State* state, int fname_idx, void* ptr, int idx, int val_index) const
        {
            using VT = typename T::value_type;
            VT tmp{};
            auto id = (type_identity*)lua_touserdata(state, DFHack::LuaWrapper::UPVAL_ITEM_ID);
            auto pitem = DFHack::LuaWrapper::get_object_internal(state, id, val_index, false);
            bool useTemporary = (!pitem && id->isPrimitive());

            if (useTemporary)
            {
                pitem = &tmp;
                id->lua_write(state, fname_idx, pitem, val_index);
            }

            if (id != item || !pitem)
                DFHack::LuaWrapper::field_error(state, fname_idx, "incompatible object type", "insert");

            return insert(ptr, idx, pitem);
        }

    protected:
        virtual int item_count(void *ptr, CountMode) const { return (int)((T*)ptr)->size(); }