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Section: 22.214.171.124 [move.iter.nonmember] Status: C++20 Submitter: Patrick Palka Opened: 2020-02-07 Last modified: 2021-02-25
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P1207R4 ("Movability of single-pass iterators") introduces the notion of a move-only non-forward iterator and makes some changes to the existing specification to realize that support.The problem is that the specification of make_move_iterator() provided in 126.96.36.199 [move.iter.nonmember] p6 does attempt to construct a move_iterator<Iterator> with an lvalue of i instead of an rvalue, having the effect of copying it instead of moving it, thus preventing to accept move-only iterators.
[2020-02 Prioritized as IMMEDIATE Monday morning in Prague]
This wording is relative to N4849.
Modify 188.8.131.52 [move.iter.nonmember] as indicated:
template<class Iterator> constexpr move_iterator<Iterator> make_move_iterator(Iterator i);
-6- Returns: move_iterator<Iterator>(i).