27 Iterators library [iterators]

27.5 Iterator adaptors [predef.iterators]

27.5.3 Move iterators [move.iterators]

27.5.3.3 move_­iterator operations [move.iter.ops]

27.5.3.3.10 move_­iterator​::​operator- [move.iter.op.-]

constexpr move_iterator operator-(difference_type n) const;

Returns: move_­iterator(current - n).