tmp/tmproivlg37/{from.md → to.md}
RENAMED
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| 1 |
+
#### Class template `basic_const_iterator` <a id="const.iterators.iterator">[[const.iterators.iterator]]</a>
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``` cpp
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namespace std {
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template<class I>
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concept not-a-const-iterator = see below; // exposition only
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template<indirectly_readable I>
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using iter-const-rvalue-reference-t = // exposition only
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common_reference_t<const iter_value_t<I>&&, iter_rvalue_reference_t<I>>;
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template<input_iterator Iterator>
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class basic_const_iterator {
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Iterator current_ = Iterator(); // exposition only
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using reference = iter_const_reference_t<Iterator>; // exposition only
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using rvalue-reference = // exposition only
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iter-const-rvalue-reference-t<Iterator>;
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public:
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using iterator_concept = see below;
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using iterator_category = see below; // not always present
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using value_type = iter_value_t<Iterator>;
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using difference_type = iter_difference_t<Iterator>;
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basic_const_iterator() requires default_initializable<Iterator> = default;
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constexpr basic_const_iterator(Iterator current);
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template<convertible_to<Iterator> U>
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constexpr basic_const_iterator(basic_const_iterator<U> current);
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template<different-from<basic_const_iterator> T>
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requires convertible_to<T, Iterator>
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constexpr basic_const_iterator(T&& current);
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constexpr const Iterator& base() const & noexcept;
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constexpr Iterator base() &&;
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constexpr reference operator*() const;
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constexpr const auto* operator->() const
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requires is_lvalue_reference_v<iter_reference_t<Iterator>> &&
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same_as<remove_cvref_t<iter_reference_t<Iterator>>, value_type>;
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constexpr basic_const_iterator& operator++();
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constexpr void operator++(int);
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constexpr basic_const_iterator operator++(int) requires forward_iterator<Iterator>;
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constexpr basic_const_iterator& operator--() requires bidirectional_iterator<Iterator>;
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constexpr basic_const_iterator operator--(int) requires bidirectional_iterator<Iterator>;
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constexpr basic_const_iterator& operator+=(difference_type n)
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requires random_access_iterator<Iterator>;
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constexpr basic_const_iterator& operator-=(difference_type n)
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requires random_access_iterator<Iterator>;
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constexpr reference operator[](difference_type n) const
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requires random_access_iterator<Iterator>;
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template<sentinel_for<Iterator> S>
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constexpr bool operator==(const S& s) const;
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constexpr bool operator<(const basic_const_iterator& y) const
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requires random_access_iterator<Iterator>;
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constexpr bool operator>(const basic_const_iterator& y) const
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requires random_access_iterator<Iterator>;
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constexpr bool operator<=(const basic_const_iterator& y) const
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requires random_access_iterator<Iterator>;
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constexpr bool operator>=(const basic_const_iterator& y) const
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requires random_access_iterator<Iterator>;
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constexpr auto operator<=>(const basic_const_iterator& y) const
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requires random_access_iterator<Iterator> && three_way_comparable<Iterator>;
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template<different-from<basic_const_iterator> I>
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constexpr bool operator<(const I& y) const
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<different-from<basic_const_iterator> I>
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constexpr bool operator>(const I& y) const
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<different-from<basic_const_iterator> I>
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constexpr bool operator<=(const I& y) const
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<different-from<basic_const_iterator> I>
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constexpr bool operator>=(const I& y) const
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<different-from<basic_const_iterator> I>
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constexpr auto operator<=>(const I& y) const
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I> &&
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three_way_comparable_with<Iterator, I>;
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template<not-a-const-iterator I>
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friend constexpr bool operator<(const I& x, const basic_const_iterator& y)
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<not-a-const-iterator I>
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friend constexpr bool operator>(const I& x, const basic_const_iterator& y)
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<not-a-const-iterator I>
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friend constexpr bool operator<=(const I& x, const basic_const_iterator& y)
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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template<not-a-const-iterator I>
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friend constexpr bool operator>=(const I& x, const basic_const_iterator& y)
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requires random_access_iterator<Iterator> && totally_ordered_with<Iterator, I>;
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friend constexpr basic_const_iterator operator+(const basic_const_iterator& i,
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difference_type n)
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requires random_access_iterator<Iterator>;
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friend constexpr basic_const_iterator operator+(difference_type n,
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const basic_const_iterator& i)
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requires random_access_iterator<Iterator>;
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friend constexpr basic_const_iterator operator-(const basic_const_iterator& i,
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difference_type n)
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requires random_access_iterator<Iterator>;
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template<sized_sentinel_for<Iterator> S>
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constexpr difference_type operator-(const S& y) const;
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template<not-a-const-iterator S>
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requires sized_sentinel_for<S, Iterator>
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friend constexpr difference_type operator-(const S& x, const basic_const_iterator& y);
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friend constexpr rvalue-reference iter_move(const basic_const_iterator& i)
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noexcept(noexcept(static_cast<rvalue-reference>(ranges::iter_move(i.current_))))
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{
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return static_cast<rvalue-reference>(ranges::iter_move(i.current_));
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}
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};
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}
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```
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Given some type `I`, the concept *not-a-const-iterator* is defined as
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`false` if `I` is a specialization of `basic_const_iterator` and `true`
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otherwise.
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