27 Iterators library [iterators]

27.5 Iterator adaptors [predef.iterators]

27.5.1 Reverse iterators [reverse.iterators]

27.5.1.3 reverse_­iterator operations [reverse.iter.ops]

27.5.1.3.1 reverse_­iterator constructor [reverse.iter.cons]

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.

constexpr explicit reverse_iterator(Iterator x);

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Effects: Initializes current with x.

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

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Effects: Initializes current with u.current.

27.5.1.3.2 reverse_­iterator​::​operator= [reverse.iter.op=]

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

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Effects: Assigns u.base() to current.

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Returns: *this.

27.5.1.3.3 Conversion [reverse.iter.conv]

constexpr Iterator base() const; // explicit

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Returns: current.

27.5.1.3.4 operator* [reverse.iter.op.star]

constexpr reference operator*() const;

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Effects: As if by: 

Iterator tmp = current;
return *--tmp;

27.5.1.3.5 operator-> [reverse.iter.opref]

constexpr pointer operator->() const;

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Returns: addressof(operator*()).

27.5.1.3.6 operator++ [reverse.iter.op++]

constexpr reverse_iterator& operator++();

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Effects: As if by: --current;

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Returns: *this.

constexpr reverse_iterator operator++(int);

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Effects: As if by: 

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

27.5.1.3.7 operator-- [reverse.iter.op--]

constexpr reverse_iterator& operator--();

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Effects: As if by ++current.

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Returns: *this.

constexpr reverse_iterator operator--(int);

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Effects: As if by: 

reverse_iterator tmp = *this;
++current;
return tmp;

27.5.1.3.8 operator+ [reverse.iter.op+]

constexpr reverse_iterator operator+(difference_type n) const;

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Returns: reverse_­iterator(current-n).

27.5.1.3.9 operator+= [reverse.iter.op+=]

constexpr reverse_iterator& operator+=(difference_type n);

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Effects: As if by: current -= n;

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Returns: *this.

27.5.1.3.10 operator- [reverse.iter.op-]

constexpr reverse_iterator operator-(difference_type n) const;

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Returns: reverse_­iterator(current+n).

27.5.1.3.11 operator-= [reverse.iter.op-=]

constexpr reverse_iterator& operator-=(difference_type n);

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Effects: As if by: current += n;

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Returns: *this.

27.5.1.3.12 operator[] [reverse.iter.opindex]

constexpr unspecified operator[](difference_type n) const;

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Returns: current[-n-1].

27.5.1.3.13 operator== [reverse.iter.op==]

template <class Iterator1, class Iterator2> constexpr bool operator==( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);

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Returns: x.current == y.current.

27.5.1.3.14 operator< [reverse.iter.op<]

template <class Iterator1, class Iterator2> constexpr bool operator<( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);

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Returns: x.current > y.current.

27.5.1.3.15 operator!= [reverse.iter.op!=]

template <class Iterator1, class Iterator2> constexpr bool operator!=( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);

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Returns: x.current != y.current.

27.5.1.3.16 operator> [reverse.iter.op>]

template <class Iterator1, class Iterator2> constexpr bool operator>( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);

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Returns: x.current < y.current.

27.5.1.3.17 operator>= [reverse.iter.op>=]

template <class Iterator1, class Iterator2> constexpr bool operator>=( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);

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Returns: x.current <= y.current.

27.5.1.3.18 operator<= [reverse.iter.op<=]

template <class Iterator1, class Iterator2> constexpr bool operator<=( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y);

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Returns: x.current >= y.current.

27.5.1.3.19 operator- [reverse.iter.opdiff]

template <class Iterator1, class Iterator2> constexpr auto operator-( const reverse_iterator<Iterator1>& x, const reverse_iterator<Iterator2>& y) -> decltype(y.base() - x.base());

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Returns: y.current - x.current.

27.5.1.3.20 operator+ [reverse.iter.opsum]

template <class Iterator> constexpr reverse_iterator<Iterator> operator+( typename reverse_iterator<Iterator>::difference_type n, const reverse_iterator<Iterator>& x);

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Returns: reverse_­iterator<Iterator> (x.current - n).

27.5.1.3.21 Non-member function make_­reverse_­iterator() [reverse.iter.make]

template <class Iterator> constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i);

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Returns: reverse_­iterator<Iterator>(i).