Method insert

library/include/DataIdentity.h:417–421

            return true;
        }
        virtual bool insert(void *ptr, int idx, void *item) const {
            auto &ct = *(T*)ptr;
            ct.insert(ct.begin()+idx, *(typename T::value_type*)item);
            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;