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next/prev wrong iterator typeSection: 24.4.3 [iterator.operations] Status: C++11 Submitter: Alisdair Meredith Opened: 2009-03-11 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
Addresses UK 271
next/prev return an incremented iterator without changing the value of
the original iterator. However, even this may invalidate an
InputIterator. A ForwardIterator is required to guarantee the
'multipass' property.
[ Batavia (2009-05): ]
We agree with the proposed resolution. Move to Tentatively Ready.
[ 2009-07 Frankfurt ]
Moved from Tentatively Ready to Open only because the wording needs to be tweaked for concepts removal.
[ 2009-10-14 Daniel provided de-conceptified wording. ]
[ 2009-10 Santa Cruz: ]
Moved to Ready.
Proposed resolution:
Change header <iterator> synopsis 24.2 [iterator.synopsis] as indicated:
// 24.4.4, iterator operations: ... template <classInputForwardIterator>InputForwardIterator next(InputForwardIterator x, typename std::iterator_traits<InputForwardIterator>::difference_type n = 1);
Change 24.4.3 [iterator.operations] before p.6 as indicated:
template <classInputForwardIterator>InputForwardIterator next(InputForwardIterator x, typename std::iterator_traits<InputForwardIterator>::difference_type n = 1);