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### 872. `move_iterator::operator[]` has wrong return type

Section: 25.5.4.6 [move.iter.elem] Status: C++11 Submitter: Doug Gregor Opened: 2008-08-21 Last modified: 2021-06-06

Priority: Not Prioritized

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Discussion:

`move_iterator`'s `operator[]` is declared as:

>     reference operator[](difference_type n) const;

This has the same problem that `reverse_iterator`'s `operator[]` used to have: if the underlying iterator's `operator[]` returns a proxy, the implicit conversion to `value_type&&` could end up referencing a temporary that has already been destroyed. This is essentially the same issue that we dealt with for `reverse_iterator` in DR 386.

[ 2009-07-28 Reopened by Alisdair. No longer solved by concepts. ]

[ 2009-08-15 Howard adds: ]

> I recommend closing this as a duplicate of 1051 which addresses this issue for both `move_iterator` and `reverse_iterator`.

[ 2009-10 Santa Cruz: ]

> Move to Ready. Note that if 1051 is reopened, it may yield a better resolution, but 1051 is currently marked NAD.

Proposed resolution:

In 25.5.4.2 [move.iterator] and [move.iter.op.index], change the declaration of `move_iterator`'s `operator[]` to:

>     reference unspecified operator[](difference_type n) const;

Rationale:

[ San Francisco: ]

> NAD Editorial, see N2777.