This header is part of the containers library.
[edit] Synopsis// mostly freestanding
#include <compare>
#include <initializer_list>
namespace std {
// class template array
template<class T, size_t N>
struct array; // partially freestanding
template<class T, size_t N>
constexpr bool operator==(const array<T, N>& x, const array<T, N>& y);
template<class T, size_t N>
constexpr /*synth-three-way-result*/<T> operator<=>(const array<T, N>& x,
const array<T, N>& y);
// specialized algorithms
template<class T, size_t N>
constexpr void swap(array<T, N>& x, array<T, N>& y) noexcept(noexcept(x.swap(y)));
// array creation functions
template<class T, size_t N>
constexpr array<remove_cv_t<T>, N> to_array(T (&a)[N]);
template<class T, size_t N>
constexpr array<remove_cv_t<T>, N> to_array(T (&&a)[N]);
// tuple interface
template<class T>
struct tuple_size;
template<size_t I, class T>
struct tuple_element;
template<class T, size_t N>
struct tuple_size<array<T, N>>;
template<size_t I, class T, size_t N>
struct tuple_element<I, array<T, N>>;
template<size_t I, class T, size_t N>
constexpr T& get(array<T, N>&) noexcept;
template<size_t I, class T, size_t N>
constexpr T&& get(array<T, N>&&) noexcept;
template<size_t I, class T, size_t N>
constexpr const T& get(const array<T, N>&) noexcept;
template<size_t I, class T, size_t N>
constexpr const T&& get(const array<T, N>&&) noexcept;
}[edit] Class template std::array
namespace std {
template<class T, size_t N>
struct array
{
// types
using value_type = T;
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using size_type = size_t;
using difference_type = ptrdiff_t;
using iterator = /* implementation-defined */;
using const_iterator = /* implementation-defined */;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = std::reverse_iterator<const_iterator>;
// no explicit construct/copy/destroy for aggregate type
constexpr void fill(const T& u);
constexpr void swap(array&) noexcept(is_nothrow_swappable_v<T>);
// iterators
constexpr iterator begin() noexcept;
constexpr const_iterator begin() const noexcept;
constexpr iterator end() noexcept;
constexpr const_iterator end() const noexcept;
constexpr reverse_iterator rbegin() noexcept;
constexpr const_reverse_iterator rbegin() const noexcept;
constexpr reverse_iterator rend() noexcept;
constexpr const_reverse_iterator rend() const noexcept;
constexpr const_iterator cbegin() const noexcept;
constexpr const_iterator cend() const noexcept;
constexpr const_reverse_iterator crbegin() const noexcept;
constexpr const_reverse_iterator crend() const noexcept;
// capacity
constexpr bool empty() const noexcept;
constexpr size_type size() const noexcept;
constexpr size_type max_size() const noexcept;
// element access
constexpr reference operator[](size_type n);
constexpr const_reference operator[](size_type n) const;
constexpr reference at(size_type n); // freestanding-deleted
constexpr const_reference at(size_type n) const; // freestanding-deleted
constexpr reference front();
constexpr const_reference front() const;
constexpr reference back();
constexpr const_reference back() const;
constexpr T* data() noexcept;
constexpr const T* data() const noexcept;
};
template<class T, class... U>
array(T, U...) -> array<T, 1 + sizeof...(U)>;
}
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