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### 237. Undefined expression in complexity specification

Section: 24.3.8.2 [deque.cons] Status: CD1 Submitter: Dietmar Kühl Opened: 2000-04-24 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

The complexity specification in paragraph 6 says that the complexity is linear in `first - last`. Even if `operator-()` is defined on iterators this term is in general undefined because it would have to be `last - first`.

Proposed resolution:

Change paragraph 6 from

> Linear in first - last.

to become

> Linear in distance(first, last).