24 Iterators library [iterators]

24.5 Iterator adaptors [predef.iterators]

24.5.1 Reverse iterators [reverse.iterators]

24.5.1.4 Construction and assignment [reverse.iter.cons]

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constexpr reverse_iterator();
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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);
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Effects: Initializes current with x.
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template<class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
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Constraints: is_same_v<U, Iterator> is false and const U& models convertible_to<Iterator>.
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Effects: Initializes current with u.current.
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template<class U> constexpr reverse_iterator& operator=(const reverse_iterator<U>& u);
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Constraints: is_same_v<U, Iterator> is false, const U& models convertible_to<Iterator>, and assignable_from<Iterator&, const U&> is modeled.
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Effects: Assigns u.current to current.
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Returns: *this.