23 Iterators library [iterators]

23.5 Iterator adaptors [predef.iterators]

23.5.1 Reverse iterators [reverse.iterators]

23.5.1.4 Construction and assignment [reverse.iter.cons]

constexpr reverse_iterator();

Effects: Value-initializes current.

Iterator operations applied to the resulting iterator have defined behavior if and only if the corresponding operations are defined on a value-initialized iterator of type Iterator.

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constexpr explicit reverse_iterator(Iterator x);

Effects: Initializes current with x.

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template<class U> constexpr reverse_iterator(const reverse_iterator<U>& u);

Effects: Initializes current with u.current.

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template<class U>
  constexpr reverse_iterator&
    operator=(const reverse_iterator<U>& u);

Effects: Assigns u.base() to current.

Returns: *this.