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>,
<string>,
<unordered_map>,
<unordered_set>, and
<vector>.template <class C> constexpr auto size(const C& c) -> decltype(c.size());
template <class T, size_t N> constexpr size_t size(const T (&array)[N]) noexcept;
template <class C> constexpr auto empty(const C& c) -> decltype(c.empty());
template <class T, size_t N> constexpr bool empty(const T (&array)[N]) noexcept;
template <class E> constexpr bool empty(initializer_list<E> il) noexcept;
template <class C> constexpr auto data(C& c) -> decltype(c.data());
template <class C> constexpr auto data(const C& c) -> decltype(c.data());
template <class T, size_t N> constexpr T* data(T (&array)[N]) noexcept;
template <class E> constexpr const E* data(initializer_list<E> il) noexcept;