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]

27.5.3.3.7 move_­iterator​::​operator-- [move.iter.op.decr]

constexpr move_iterator& operator--();

1
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Effects: Как будто мимо --current.

2
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Returns: *this.

constexpr move_iterator operator--(int);

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Effects: Как будто по: 

move_iterator tmp = *this;
--current;
return tmp;