[reverse.iter.ops] - C++17 → C++20

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-#### `reverse_iterator` operations <a id="reverse.iter.ops">[[reverse.iter.ops]]</a>
-##### `reverse_iterator` constructor <a id="reverse.iter.cons">[[reverse.iter.cons]]</a>
-``` cpp
-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`.
-``` cpp
-constexpr explicit reverse_iterator(Iterator x);
-```
-*Effects:* Initializes `current` with `x`.
-``` cpp
-template <class U> constexpr reverse_iterator(const reverse_iterator<U>& u);
-```
-*Effects:* Initializes `current` with `u.current`.
-##### `reverse_iterator::operator=` <a id="reverse.iter.op=">[[reverse.iter.op=]]</a>
-``` cpp
-template <class U>
-constexpr reverse_iterator&
-  operator=(const reverse_iterator<U>& u);
-```
-*Effects:* Assigns `u.base()` to current.
-*Returns:* `*this`.
-##### Conversion <a id="reverse.iter.conv">[[reverse.iter.conv]]</a>
-``` cpp
-constexpr Iterator base() const;          // explicit
-```
-*Returns:* `current`.
-##### `operator*` <a id="reverse.iter.op.star">[[reverse.iter.op.star]]</a>
-``` cpp
-constexpr reference operator*() const;
-```
-*Effects:* As if by:
-``` cpp
-Iterator tmp = current;
-return *--tmp;
-```
-##### `operator->` <a id="reverse.iter.opref">[[reverse.iter.opref]]</a>
-``` cpp
-constexpr pointer operator->() const;
-```
-*Returns:* `addressof(operator*())`.
-##### `operator++` <a id="reverse.iter.op++">[[reverse.iter.op++]]</a>
-``` cpp
-constexpr reverse_iterator& operator++();
-```
-*Effects:* As if by: `current;`
-*Returns:* `*this`.
-``` cpp
-constexpr reverse_iterator operator++(int);
-```
-*Effects:* As if by:
-``` cpp
-reverse_iterator tmp = *this;
---current;
-return tmp;
-```
-\[reverse.iter.op\]`operator\dcr`
-``` cpp
-constexpr reverse_iterator& operator--();
-```
-*Effects:* As if by `++current`.
-*Returns:* `*this`.
-``` cpp
-constexpr reverse_iterator operator--(int);
-```
-*Effects:* As if by:
-``` cpp
-reverse_iterator tmp = *this;
-++current;
-return tmp;
-```
-##### `operator+` <a id="reverse.iter.op+">[[reverse.iter.op+]]</a>
-``` cpp
-constexpr reverse_iterator operator+(difference_type n) const;
-```
-*Returns:* `reverse_iterator(current-n)`.
-##### `operator+=` <a id="reverse.iter.op+=">[[reverse.iter.op+=]]</a>
-``` cpp
-constexpr reverse_iterator& operator+=(difference_type n);
-```
-*Effects:* As if by: `current -= n;`
-*Returns:* `*this`.
-##### `operator-` <a id="reverse.iter.op-">[[reverse.iter.op-]]</a>
-``` cpp
-constexpr reverse_iterator operator-(difference_type n) const;
-```
-*Returns:* `reverse_iterator(current+n)`.
-##### `operator-=` <a id="reverse.iter.op-=">[[reverse.iter.op-=]]</a>
-``` cpp
-constexpr reverse_iterator& operator-=(difference_type n);
-```
-*Effects:* As if by: `current += n;`
-*Returns:* `*this`.
-##### `operator[]` <a id="reverse.iter.opindex">[[reverse.iter.opindex]]</a>
-``` cpp
-constexpr unspecified operator[](difference_type n) const;
-```
-*Returns:* `current[-n-1]`.
-##### `operator==` <a id="reverse.iter.op==">[[reverse.iter.op==]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-  constexpr bool operator==(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y);
-```
-*Returns:* `x.current == y.current`.
-##### `operator<` <a id="reverse.iter.op<">[[reverse.iter.op<]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-  constexpr bool operator<(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y);
-```
-*Returns:* `x.current > y.current`.
-##### `operator!=` <a id="reverse.iter.op!=">[[reverse.iter.op!=]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-  constexpr bool operator!=(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y);
-```
-*Returns:* `x.current != y.current`.
-##### `operator>` <a id="reverse.iter.op>">[[reverse.iter.op>]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-  constexpr bool operator>(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y);
-```
-*Returns:* `x.current < y.current`.
-##### `operator>=` <a id="reverse.iter.op>=">[[reverse.iter.op>=]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-  constexpr bool operator>=(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y);
-```
-*Returns:* `x.current <= y.current`.
-##### `operator<=` <a id="reverse.iter.op<=">[[reverse.iter.op<=]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-  constexpr bool operator<=(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y);
-```
-*Returns:* `x.current >= y.current`.
-##### `operator-` <a id="reverse.iter.opdiff">[[reverse.iter.opdiff]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-    constexpr auto operator-(
-    const reverse_iterator<Iterator1>& x,
-    const reverse_iterator<Iterator2>& y) -> decltype(y.base() - x.base());
-```
-*Returns:* `y.current - x.current`.
-##### `operator+` <a id="reverse.iter.opsum">[[reverse.iter.opsum]]</a>
-``` cpp
-template <class Iterator>
-  constexpr reverse_iterator<Iterator> operator+(
-    typename reverse_iterator<Iterator>::difference_type n,
-    const reverse_iterator<Iterator>& x);
-```
-*Returns:* `reverse_iterator<Iterator> (x.current - n)`.
-##### Non-member function `make_reverse_iterator()` <a id="reverse.iter.make">[[reverse.iter.make]]</a>
-``` cpp
-template <class Iterator>
-  constexpr reverse_iterator<Iterator> make_reverse_iterator(Iterator i);
-```
-*Returns:* `reverse_iterator<Iterator>(i)`.

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