[move.iter.ops] - C++17 → C++20

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-#### `move_iterator` operations <a id="move.iter.ops">[[move.iter.ops]]</a>
-##### `move_iterator` constructors <a id="move.iter.op.const">[[move.iter.op.const]]</a>
-``` cpp
-constexpr move_iterator();
-```
-*Effects:* Constructs a `move_iterator`, value-initializing `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 move_iterator(Iterator i);
-```
-*Effects:* Constructs a `move_iterator`, initializing `current` with
-`i`.
-``` cpp
-template <class U> constexpr move_iterator(const move_iterator<U>& u);
-```
-*Effects:* Constructs a `move_iterator`, initializing `current` with
-`u.base()`.
-*Requires:* `U` shall be convertible to `Iterator`.
-##### `move_iterator::operator=` <a id="move.iter.op=">[[move.iter.op=]]</a>
-``` cpp
-template <class U> constexpr move_iterator& operator=(const move_iterator<U>& u);
-```
-*Effects:* Assigns `u.base()` to `current`.
-*Requires:* `U` shall be convertible to `Iterator`.
-##### `move_iterator` conversion <a id="move.iter.op.conv">[[move.iter.op.conv]]</a>
-``` cpp
-constexpr Iterator base() const;
-```
-*Returns:* `current`.
-##### `move_iterator::operator*` <a id="move.iter.op.star">[[move.iter.op.star]]</a>
-``` cpp
-constexpr reference operator*() const;
-```
-*Returns:* `static_cast<reference>(*current)`.
-##### `move_iterator::operator->` <a id="move.iter.op.ref">[[move.iter.op.ref]]</a>
-``` cpp
-constexpr pointer operator->() const;
-```
-*Returns:* `current`.
-##### `move_iterator::operator++` <a id="move.iter.op.incr">[[move.iter.op.incr]]</a>
-``` cpp
-constexpr move_iterator& operator++();
-```
-*Effects:* As if by `++current`.
-*Returns:* `*this`.
-``` cpp
-constexpr move_iterator operator++(int);
-```
-*Effects:* As if by:
-``` cpp
-move_iterator tmp = *this;
-++current;
-return tmp;
-```
-##### `move_iterator::operator-{-}` <a id="move.iter.op.decr">[[move.iter.op.decr]]</a>
-``` cpp
-constexpr move_iterator& operator--();
-```
-*Effects:* As if by `current`.
-*Returns:* `*this`.
-``` cpp
-constexpr move_iterator operator--(int);
-```
-*Effects:* As if by:
-``` cpp
-move_iterator tmp = *this;
---current;
-return tmp;
-```
-##### `move_iterator::operator+` <a id="move.iter.op.+">[[move.iter.op.+]]</a>
-``` cpp
-constexpr move_iterator operator+(difference_type n) const;
-```
-*Returns:* `move_iterator(current + n)`.
-##### `move_iterator::operator+=` <a id="move.iter.op.+=">[[move.iter.op.+=]]</a>
-``` cpp
-constexpr move_iterator& operator+=(difference_type n);
-```
-*Effects:* As if by: `current += n;`
-*Returns:* `*this`.
-##### `move_iterator::operator-` <a id="move.iter.op.-">[[move.iter.op.-]]</a>
-``` cpp
-constexpr move_iterator operator-(difference_type n) const;
-```
-*Returns:* `move_iterator(current - n)`.
-##### `move_iterator::operator-=` <a id="move.iter.op.-=">[[move.iter.op.-=]]</a>
-``` cpp
-constexpr move_iterator& operator-=(difference_type n);
-```
-*Effects:* As if by: `current -= n;`
-*Returns:* `*this`.
-##### `move_iterator::operator[]` <a id="move.iter.op.index">[[move.iter.op.index]]</a>
-``` cpp
-constexpr unspecified operator[](difference_type n) const;
-```
-*Returns:* `std::move(current[n])`.
-##### `move_iterator` comparisons <a id="move.iter.op.comp">[[move.iter.op.comp]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-constexpr bool operator==(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
-```
-*Returns:* `x.base() == y.base()`.
-``` cpp
-template <class Iterator1, class Iterator2>
-constexpr bool operator!=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
-```
-*Returns:* `!(x == y)`.
-``` cpp
-template <class Iterator1, class Iterator2>
-constexpr bool operator<(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
-```
-*Returns:* `x.base() < y.base()`.
-``` cpp
-template <class Iterator1, class Iterator2>
-constexpr bool operator<=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
-```
-*Returns:* `!(y < x)`.
-``` cpp
-template <class Iterator1, class Iterator2>
-constexpr bool operator>(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
-```
-*Returns:* `y < x`.
-``` cpp
-template <class Iterator1, class Iterator2>
-constexpr bool operator>=(const move_iterator<Iterator1>& x, const move_iterator<Iterator2>& y);
-```
-*Returns:* `!(x < y)`.
-##### `move_iterator` non-member functions <a id="move.iter.nonmember">[[move.iter.nonmember]]</a>
-``` cpp
-template <class Iterator1, class Iterator2>
-    constexpr auto operator-(
-    const move_iterator<Iterator1>& x,
-    const move_iterator<Iterator2>& y) -> decltype(x.base() - y.base());
-```
-*Returns:* `x.base() - y.base()`.
-``` cpp
-template <class Iterator>
-  constexpr move_iterator<Iterator> operator+(
-    typename move_iterator<Iterator>::difference_type n, const move_iterator<Iterator>& x);
-```
-*Returns:* `x + n`.
-``` cpp
-template <class Iterator>
-constexpr move_iterator<Iterator> make_move_iterator(Iterator i);
-```
-*Returns:* `move_iterator<Iterator>(i)`.

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