[array.members]

# 23 Containers library [[containers]](./#containers)

## 23.3 Sequence containers [[sequences]](sequences#array.members)

### 23.3.3 Class template array [[array]](array#members)

#### 23.3.3.3 Member functions [array.members]

[ð](#lib:array,size)

`constexpr size_type size() const noexcept;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L6247)

*Returns*: N[.](#1.sentence-1)

[ð](#lib:array,data)

`constexpr T* data() noexcept;
constexpr const T* data() const noexcept;
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L6259)

*Returns*: A pointer such that [data(), data() + size()) is a valid range[.](#2.sentence-1)

For a
non-empty array, data() == addressof(front()) is true[.](#2.sentence-2)

[ð](#lib:array,fill)

`constexpr void fill(const T& u);
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L6271)

*Effects*: As if by fill_n(begin(), N, u)[.](#3.sentence-1)

[ð](#lib:array,swap)

`constexpr void swap(array& y) noexcept(is_nothrow_swappable_v<T>);
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L6282)

*Effects*: Equivalent to swap_ranges(begin(), end(), y.begin())[.](#4.sentence-1)

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L6286)

[*Note [1](#note-1)*:

Unlike the swap function for other containers, array​::​swap takes linear time, can exit via an exception, and does not cause iterators to
become associated with the other container[.](#5.sentence-1)

â *end note*]
