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Leonov Artur (Depish)
2025-10-25 03:02:53 +03:00
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[span.elem]
# 23 Containers library [[containers]](./#containers)
## 23.7 Views [[views]](views#span.elem)
### 23.7.2 Contiguous access [[views.contiguous]](views.contiguous#span.elem)
#### 23.7.2.2 Class template span [[views.span]](views.span#span.elem)
#### 23.7.2.2.6 Element access [span.elem]
[🔗](#lib:operator%5b%5d,span)
`constexpr reference operator[](size_type idx) const;
`
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20808)
*Hardened preconditions*: idx < size() is true[.](#1.sentence-1)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20812)
*Returns*: *(data() + idx)[.](#2.sentence-1)
[3](#3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20816)
*Throws*: Nothing[.](#3.sentence-1)
[🔗](#lib:span,at)
`constexpr reference at(size_type idx) const;
`
[4](#4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20827)
*Returns*: *(data() + idx)[.](#4.sentence-1)
[5](#5)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20831)
*Throws*: out_of_range if idx >= size() is true[.](#5.sentence-1)
[🔗](#lib:span,front)
`constexpr reference front() const;
`
[6](#6)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20842)
*Hardened preconditions*: empty() is false[.](#6.sentence-1)
[7](#7)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20846)
*Returns*: *data()[.](#7.sentence-1)
[8](#8)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20850)
*Throws*: Nothing[.](#8.sentence-1)
[🔗](#lib:span,back)
`constexpr reference back() const;
`
[9](#9)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20861)
*Hardened preconditions*: empty() is false[.](#9.sentence-1)
[10](#10)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20865)
*Returns*: *(data() + (size() - 1))[.](#10.sentence-1)
[11](#11)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20869)
*Throws*: Nothing[.](#11.sentence-1)
[🔗](#lib:span,data)
`constexpr pointer data() const noexcept;
`
[12](#12)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/containers.tex#L20880)
*Returns*: *data_*[.](#12.sentence-1)