22 Iterators library [iterators]

22.8 Container and view access [iterator.container]

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In addition to being available via inclusion of the <iterator> header, the function templates in [iterator.container] are available when any of the following headers are included: <array>, <deque>, <forward_­list>, <list>, <map>, <regex>, <set>, <span>, <string>, <string_­view>, <unordered_­map>, <unordered_­set>, and <vector>.
Each of these templates is a designated customization point ([namespace.std]).
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template<class C> constexpr auto size(const C& c) -> decltype(c.size());
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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;
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Returns: N.
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template<class C> [[nodiscard]] constexpr auto empty(const C& c) -> decltype(c.empty());
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Returns: c.empty().
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template<class T, size_t N> [[nodiscard]] constexpr bool empty(const T (&array)[N]) noexcept;
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Returns: false.
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template<class E> [[nodiscard]] constexpr bool empty(initializer_list<E> il) noexcept;
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Returns: il.size() == 0.
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template<class C> constexpr auto data(C& c) -> decltype(c.data()); template<class C> constexpr auto data(const C& c) -> decltype(c.data());
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Returns: c.data().
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template<class T, size_t N> constexpr T* data(T (&array)[N]) noexcept;
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Returns: array.
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template<class E> constexpr const E* data(initializer_list<E> il) noexcept;
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Returns: il.begin().