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In addition to being available via inclusion of the <iterator> header, the function templates in [iterator.range] are available when any of the following headers are included:
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template<class C> constexpr auto begin(C& c) noexcept(noexcept(c.begin() -> decltype(c.begin(); template<class C> constexpr auto begin(const C& c) noexcept(noexcept(c.begin() -> decltype(c.begin();
2
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Returns: c.begin().
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template<class C> constexpr auto end(C& c) noexcept(noexcept(c.end() -> decltype(c.end(); template<class C> constexpr auto end(const C& c) noexcept(noexcept(c.end() -> decltype(c.end();
3
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Returns: c.end().
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template<class T, size_t N> constexpr T* begin(T (&array)[N]) noexcept;
4
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Returns: array.
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template<class T, size_t N> constexpr T* end(T (&array)[N]) noexcept;
5
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Returns: array + N.
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template<class C> constexpr auto cbegin(const C& c) noexcept(noexcept(std::begin(c)) -> decltype(std::begin(c));
6
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Returns: std​::​begin(c).
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template<class C> constexpr auto cend(const C& c) noexcept(noexcept(std::end(c)) -> decltype(std::end(c));
7
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Returns: std​::​end(c).
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template<class C> constexpr auto rbegin(C& c) noexcept(noexcept(c.rbegin() -> decltype(c.rbegin(); template<class C> constexpr auto rbegin(const C& c) noexcept(noexcept(c.rbegin() -> decltype(c.rbegin();
8
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Returns: c.rbegin().
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template<class C> constexpr auto rend(C& c) noexcept(noexcept(c.rend() -> decltype(c.rend(); template<class C> constexpr auto rend(const C& c) noexcept(noexcept(c.rend() -> decltype(c.rend();
9
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Returns: c.rend().
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template<class T, size_t N> constexpr reverse_iterator<T*> rbegin(T (&array)[N]) noexcept;
10
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Returns: reverse_iterator<T*>(array + N).
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template<class T, size_t N> constexpr reverse_iterator<T*> rend(T (&array)[N]) noexcept;
11
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Returns: reverse_iterator<T*>(array).
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template<class E> constexpr reverse_iterator<const E*> rbegin(initializer_list<E> il) noexcept;
12
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Returns: reverse_iterator<const E*>(il.end().
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template<class E> constexpr reverse_iterator<const E*> rend(initializer_list<E> il) noexcept;
13
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Returns: reverse_iterator<const E*>(il.begin().
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template<class C> constexpr auto crbegin(const C& c) noexcept(noexcept(std::rbegin(c)) -> decltype(std::rbegin(c));
14
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Returns: std​::​rbegin(c).
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template<class C> constexpr auto crend(const C& c) noexcept(noexcept(c.crend() -> decltype(std::rend(c));
15
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Returns: std​::​rend(c).
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template<class C> constexpr auto size(const C& c) noexcept(noexcept(c.size() -> decltype(c.size();
16
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Returns: c.size().
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template<class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept;
17
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Returns: N.
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template<class C> constexpr auto ssize(const C& c) noexcept(noexcept(c.size() -> common_type_t<ptrdiff_t, make_signed_t<decltype(c.size()>;
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Effects: Equivalent to: return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(c.size()>(c.size();
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template<class T, ptrdiff_t N> constexpr ptrdiff_t ssize(const T (&array)[N]) noexcept;
19
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Returns: N.
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template<class C> constexpr auto empty(const C& c) noexcept(noexcept(c.empty() -> decltype(c.empty();
20
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Returns: c.empty().
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template<class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept;
21
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Returns: false.
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template<class C> constexpr auto data(C& c) noexcept(noexcept(c.data() -> decltype(c.data(); template<class C> constexpr auto data(const C& c) noexcept(noexcept(c.data() -> decltype(c.data();
22
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Returns: c.data().
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template<class T, size_t N> constexpr T* data(T (&array)[N]) noexcept;
23
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Returns: array.

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