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[const.iterators.alias]
# 24 Iterators library [[iterators]](./#iterators)
## 24.5 Iterator adaptors [[predef.iterators]](predef.iterators#const.iterators.alias)
### 24.5.3 Constant iterators and sentinels [[const.iterators]](const.iterators#alias)
#### 24.5.3.2 Alias templates [const.iterators.alias]
[🔗](#concept:constant-iterator)
`template<[indirectly_readable](iterator.concept.readable#concept:indirectly_readable "24.3.4.2 Concept indirectly_­readable [iterator.concept.readable]") It>
using [iter_const_reference_t](#lib:iter_const_reference_t "24.5.3.2 Alias templates [const.iterators.alias]") =
common_reference_t<const iter_value_t<It>&&, iter_reference_t<It>>;
template<class It>
concept [constant-iterator](#concept:constant-iterator "24.5.3.2 Alias templates [const.iterators.alias]") = // exposition only
[input_iterator](iterator.concept.input#concept:input_iterator "24.3.4.9 Concept input_­iterator [iterator.concept.input]")<It> && [same_as](concept.same#concept:same_as "18.4.2 Concept same_­as [concept.same]")<iter_const_reference_t<It>, iter_reference_t<It>>;
template<[input_iterator](iterator.concept.input#concept:input_iterator "24.3.4.9 Concept input_­iterator [iterator.concept.input]") I>
using [const_iterator](#lib:const_iterator "24.5.3.2 Alias templates [const.iterators.alias]") = see below;
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4207)
*Result*: If I models [*constant-iterator*](#concept:constant-iterator "24.5.3.2 Alias templates [const.iterators.alias]"), I[.](#1.sentence-1)
Otherwise, basic_const_iterator<I>[.](#1.sentence-2)
[🔗](#itemdecl:2)
`template<[semiregular](concepts.object#concept:semiregular "18.6 Object concepts [concepts.object]") S>
using [const_sentinel](#lib:const_sentinel "24.5.3.2 Alias templates [const.iterators.alias]") = see below;
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4219)
*Result*: If S models [input_iterator](iterator.concept.input#concept:input_iterator "24.3.4.9 Concept input_­iterator [iterator.concept.input]"), const_iterator<S>[.](#2.sentence-1)
Otherwise, S[.](#2.sentence-2)

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[const.iterators.general]
# 24 Iterators library [[iterators]](./#iterators)
## 24.5 Iterator adaptors [[predef.iterators]](predef.iterators#const.iterators.general)
### 24.5.3 Constant iterators and sentinels [[const.iterators]](const.iterators#general)
#### 24.5.3.1 General [const.iterators.general]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4179)
Class template basic_const_iterator is an iterator adaptor
with the same behavior as the underlying iterator
except that its indirection operator implicitly converts
the value returned by the underlying iterator's indirection operator
to a type such that the adapted iterator is
a constant iterator ([[iterator.requirements]](iterator.requirements "24.3 Iterator requirements"))[.](#1.sentence-1)
Some generic algorithms can be called with constant iterators to avoid mutation[.](#1.sentence-2)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4188)
Specializations of basic_const_iterator are constant iterators[.](#2.sentence-1)

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[const.iterators.ops]
# 24 Iterators library [[iterators]](./#iterators)
## 24.5 Iterator adaptors [[predef.iterators]](predef.iterators#const.iterators.ops)
### 24.5.3 Constant iterators and sentinels [[const.iterators]](const.iterators#ops)
#### 24.5.3.5 Operations [const.iterators.ops]
[🔗](#lib:basic_const_iterator,constructor)
`constexpr basic_const_iterator(Iterator current);
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4395)
*Effects*: Initializes *current_* with std​::​move(current)[.](#1.sentence-1)
[🔗](#lib:basic_const_iterator,constructor_)
`template<[convertible_to](concept.convertible#concept:convertible_to "18.4.4 Concept convertible_­to [concept.convertible]")<Iterator> U>
constexpr basic_const_iterator(basic_const_iterator<U> current);
`
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4407)
*Effects*: Initializes *current_* with std​::​move(current.*current_*)[.](#2.sentence-1)
[🔗](#lib:basic_const_iterator,constructor__)
`template<[different-from](range.utility.helpers#concept:different-from "25.5.2 Helper concepts [range.utility.helpers]")<basic_const_iterator> T>
requires [convertible_to](concept.convertible#concept:convertible_to "18.4.4 Concept convertible_­to [concept.convertible]")<T, Iterator>
constexpr basic_const_iterator(T&& current);
`
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4421)
*Effects*: Initializes *current_* with std​::​forward<T>(current)[.](#3.sentence-1)
[🔗](#lib:base,basic_const_iterator)
`constexpr const Iterator& base() const & noexcept;
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4432)
*Effects*: Equivalent to: return *current_*;
[🔗](#lib:base,basic_const_iterator_)
`constexpr Iterator base() &&;
`
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4443)
*Effects*: Equivalent to: return std​::​move(*current_*);
[🔗](#lib:operator*,basic_const_iterator)
`constexpr reference operator*() const;
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4454)
*Effects*: Equivalent to: return static_cast<*reference*>(**current_*);
[🔗](#lib:operator-%3e,basic_const_iterator)
`constexpr const auto* operator->() const
requires is_lvalue_reference_v<iter_reference_t<Iterator>> &&
[same_as](concept.same#concept:same_as "18.4.2 Concept same_­as [concept.same]")<remove_cvref_t<iter_reference_t<Iterator>>, value_type>;
`
[7](#7)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4467)
*Returns*: If Iterator models [contiguous_iterator](iterator.concept.contiguous#concept:contiguous_iterator "24.3.4.14 Concept contiguous_­iterator [iterator.concept.contiguous]"),to_address(*current_*);
otherwise, addressof(**current_*)[.](#7.sentence-1)
[🔗](#lib:operator++,basic_const_iterator)
`constexpr basic_const_iterator& operator++();
`
[8](#8)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4480)
*Effects*: Equivalent to:++*current_*;return *this;
[🔗](#lib:operator++,basic_const_iterator_)
`constexpr void operator++(int);
`
[9](#9)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4495)
*Effects*: Equivalent to: ++*current_*;
[🔗](#lib:operator++,basic_const_iterator__)
`constexpr basic_const_iterator operator++(int) requires [forward_iterator](iterator.concept.forward#concept:forward_iterator "24.3.4.11 Concept forward_­iterator [iterator.concept.forward]")<Iterator>;
`
[10](#10)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4506)
*Effects*: Equivalent to:auto tmp = *this;++*this;return tmp;
[🔗](#lib:operator--,basic_const_iterator)
`constexpr basic_const_iterator& operator--() requires [bidirectional_iterator](iterator.concept.bidir#concept:bidirectional_iterator "24.3.4.12 Concept bidirectional_­iterator [iterator.concept.bidir]")<Iterator>;
`
[11](#11)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4522)
*Effects*: Equivalent to:--*current_*;return *this;
[🔗](#lib:operator--,basic_const_iterator_)
`constexpr basic_const_iterator operator--(int) requires [bidirectional_iterator](iterator.concept.bidir#concept:bidirectional_iterator "24.3.4.12 Concept bidirectional_­iterator [iterator.concept.bidir]")<Iterator>;
`
[12](#12)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4537)
*Effects*: Equivalent to:auto tmp = *this;--*this;return tmp;
[🔗](#lib:operator+=,basic_const_iterator)
`constexpr basic_const_iterator& operator+=(difference_type n)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
constexpr basic_const_iterator& operator-=(difference_type n)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
`
[13](#13)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4557)
Let *op* be the operator[.](#13.sentence-1)
[14](#14)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4560)
*Effects*: Equivalent to:*current_* *op* n;return *this;
[🔗](#lib:operator%5b%5d,basic_const_iterator)
`constexpr reference operator[](difference_type n) const requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>
`
[15](#15)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4575)
*Effects*: Equivalent to: return static_cast<*reference*>(*current_*[n]);
[🔗](#lib:operator==,basic_const_iterator)
`template<[sentinel_for](iterator.concept.sentinel#concept:sentinel_for "24.3.4.7 Concept sentinel_­for [iterator.concept.sentinel]")<Iterator> S>
constexpr bool operator==(const S& s) const;
`
[16](#16)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4587)
*Effects*: Equivalent to: return *current_* == s;
[🔗](#itemdecl:16)
`template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") CI>
requires [constant-iterator](const.iterators.alias#concept:constant-iterator "24.5.3.2 Alias templates [const.iterators.alias]")<CI> && [convertible_to](concept.convertible#concept:convertible_to "18.4.4 Concept convertible_­to [concept.convertible]")<Iterator const&, CI>
constexpr operator CI() const &;
`
[17](#17)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4599)
*Returns*: *current_*[.](#17.sentence-1)
[🔗](#itemdecl:17)
`template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") CI>
requires [constant-iterator](const.iterators.alias#concept:constant-iterator "24.5.3.2 Alias templates [const.iterators.alias]")<CI> && [convertible_to](concept.convertible#concept:convertible_to "18.4.4 Concept convertible_­to [concept.convertible]")<Iterator, CI>
constexpr operator CI() &&;
`
[18](#18)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4611)
*Returns*: std​::​move(*current_*)[.](#18.sentence-1)
[🔗](#lib:operator%3c,basic_const_iterator)
`constexpr bool operator<(const basic_const_iterator& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
constexpr bool operator>(const basic_const_iterator& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
constexpr bool operator<=(const basic_const_iterator& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
constexpr bool operator>=(const basic_const_iterator& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
constexpr auto operator<=>(const basic_const_iterator& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [three_way_comparable](cmp.concept#concept:three_way_comparable "17.12.4 Concept three_­way_­comparable [cmp.concept]")<Iterator>;
`
[19](#19)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4635)
Let *op* be the operator[.](#19.sentence-1)
[20](#20)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4638)
*Effects*: Equivalent to:return *current_* *op* *y.current_*;
[🔗](#lib:operator%3c,basic_const_iterator_)
`template<[different-from](range.utility.helpers#concept:different-from "25.5.2 Helper concepts [range.utility.helpers]")<basic_const_iterator> I>
constexpr bool operator<(const I& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[different-from](range.utility.helpers#concept:different-from "25.5.2 Helper concepts [range.utility.helpers]")<basic_const_iterator> I>
constexpr bool operator>(const I& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[different-from](range.utility.helpers#concept:different-from "25.5.2 Helper concepts [range.utility.helpers]")<basic_const_iterator> I>
constexpr bool operator<=(const I& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[different-from](range.utility.helpers#concept:different-from "25.5.2 Helper concepts [range.utility.helpers]")<basic_const_iterator> I>
constexpr bool operator>=(const I& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[different-from](range.utility.helpers#concept:different-from "25.5.2 Helper concepts [range.utility.helpers]")<basic_const_iterator> I>
constexpr auto operator<=>(const I& y) const
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I> &&
[three_way_comparable_with](cmp.concept#concept:three_way_comparable_with "17.12.4 Concept three_­way_­comparable [cmp.concept]")<Iterator, I>;
`
[21](#21)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4669)
Let *op* be the operator[.](#21.sentence-1)
[22](#22)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4672)
*Effects*: Equivalent to: return *current_* *op* y;
[🔗](#lib:operator%3c,basic_const_iterator__)
`template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") I>
friend constexpr bool operator<(const I& x, const basic_const_iterator& y)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") I>
friend constexpr bool operator>(const I& x, const basic_const_iterator& y)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") I>
friend constexpr bool operator<=(const I& x, const basic_const_iterator& y)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") I>
friend constexpr bool operator>=(const I& x, const basic_const_iterator& y)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator> && [totally_ordered_with](concept.totallyordered#concept:totally_ordered_with "18.5.5 Concept totally_­ordered [concept.totallyordered]")<Iterator, I>;
`
[23](#23)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4697)
Let *op* be the operator[.](#23.sentence-1)
[24](#24)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4700)
*Effects*: Equivalent to: return x *op* y.*current_*;
[🔗](#lib:operator+,basic_const_iterator)
`friend constexpr basic_const_iterator operator+(const basic_const_iterator& i, difference_type n)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
friend constexpr basic_const_iterator operator+(difference_type n, const basic_const_iterator& i)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
`
[25](#25)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4714)
*Effects*: Equivalent to: return basic_const_iterator(i.*current_* + n);
[🔗](#lib:operator-,basic_const_iterator)
`friend constexpr basic_const_iterator operator-(const basic_const_iterator& i, difference_type n)
requires [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]")<Iterator>;
`
[26](#26)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4726)
*Effects*: Equivalent to: return basic_const_iterator(i.*current_* - n);
[🔗](#lib:operator-,basic_const_iterator_)
`template<[sized_sentinel_for](iterator.concept.sizedsentinel#concept:sized_sentinel_for "24.3.4.8 Concept sized_­sentinel_­for [iterator.concept.sizedsentinel]")<Iterator> S>
constexpr difference_type operator-(const S& y) const;
`
[27](#27)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4738)
*Effects*: Equivalent to: return *current_* - y;
[🔗](#lib:operator-,basic_const_iterator__)
`template<[not-a-const-iterator](const.iterators.iterator#concept:not-a-const-iterator "24.5.3.3 Class template basic_­const_­iterator [const.iterators.iterator]") S>
requires [sized_sentinel_for](iterator.concept.sizedsentinel#concept:sized_sentinel_for "24.3.4.8 Concept sized_­sentinel_­for [iterator.concept.sizedsentinel]")<S, Iterator>
friend constexpr difference_type operator-(const S& x, const basic_const_iterator& y);
`
[28](#28)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4751)
*Effects*: Equivalent to: return x - y.*current_*;

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[const.iterators.types]
# 24 Iterators library [[iterators]](./#iterators)
## 24.5 Iterator adaptors [[predef.iterators]](predef.iterators#const.iterators.types)
### 24.5.3 Constant iterators and sentinels [[const.iterators]](const.iterators#types)
#### 24.5.3.4 Member types [const.iterators.types]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4361)
basic_const_iterator<Iterator>​::​iterator_concept is defined as follows:
- [(1.1)](#1.1)
If Iterator models [contiguous_iterator](iterator.concept.contiguous#concept:contiguous_iterator "24.3.4.14 Concept contiguous_­iterator [iterator.concept.contiguous]"),
then iterator_concept denotes contiguous_iterator_tag[.](#1.1.sentence-1)
- [(1.2)](#1.2)
Otherwise, if Iterator models [random_access_iterator](iterator.concept.random.access#concept:random_access_iterator "24.3.4.13 Concept random_­access_­iterator [iterator.concept.random.access]"),
then iterator_concept denotes random_access_iterator_tag[.](#1.2.sentence-1)
- [(1.3)](#1.3)
Otherwise, if Iterator models [bidirectional_iterator](iterator.concept.bidir#concept:bidirectional_iterator "24.3.4.12 Concept bidirectional_­iterator [iterator.concept.bidir]"),
then iterator_concept denotes bidirectional_iterator_tag[.](#1.3.sentence-1)
- [(1.4)](#1.4)
Otherwise, if Iterator models [forward_iterator](iterator.concept.forward#concept:forward_iterator "24.3.4.11 Concept forward_­iterator [iterator.concept.forward]"),
then iterator_concept denotes forward_iterator_tag[.](#1.4.sentence-1)
- [(1.5)](#1.5)
Otherwise, iterator_concept denotes input_iterator_tag[.](#1.5.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iterators.tex#L4380)
The member [*typedef-name*](dcl.typedef#nt:typedef-name "9.2.4 The typedef specifier [dcl.typedef]") iterator_category is defined
if and only if Iterator models [forward_iterator](iterator.concept.forward#concept:forward_iterator "24.3.4.11 Concept forward_­iterator [iterator.concept.forward]")[.](#2.sentence-1)
In that case,basic_const_iterator<Iterator>​::​iterator_category denotes
the type iterator_traits<​Iterator>​::​iterator_category[.](#2.sentence-2)

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