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1109.std::includes should require CopyConstructible predicate
Section: 26.8.7.2 [includes] Status: NAD Concepts Submitter: Alisdair Meredith Opened: 2009-04-28 Last modified: 2016-01-28
Priority: Not Prioritized
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Discussion:
All the set operation algorithms require a CopyConstructible predicate, with the exception of std::includes. This looks like a typo as much as anything, given the general library requirement that predicates are copy constructible, and wording style of other set-like operations.
[ Batavia (2009-05): ]
We agree with the proposed resolution. Move to NAD Editorial.
Proposed resolution:
Change [algorithms.syn] and 26.8.7.2 [includes]:
template<InputIterator Iter1, InputIterator Iter2,
typename CopyConstructible Compare>
requires Predicate<Compare, Iter1::value_type, Iter2::value_type>
&& Predicate<Compare, Iter2::value_type, Iter1::value_type>
bool includes(Iter1 first1, Iter1 last1,
Iter2 first2, Iter2 last2,
Compare comp);
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