23 Iterators library [iterators]

23.5 Iterator adaptors [predef.iterators]

23.5.1 Reverse iterators [reverse.iterators] 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.
constexpr explicit reverse_iterator(Iterator x);
Effects: Initializes current with x.
template<class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
Effects: Initializes current with u.current.
template<class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
Effects: Assigns u.base() to current.
Returns: *this.