[range.iota.overview]

# 25 Ranges library [[ranges]](./#ranges)

## 25.6 Range factories [[range.factories]](range.factories#range.iota.overview)

### 25.6.4 Iota view [[range.iota]](range.iota#overview)

#### 25.6.4.1 Overview [range.iota.overview]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L2778)

iota_view generates a
sequence of elements by repeatedly incrementing an initial value[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L2782)

The name views​::​iota denotes a
customization point object ([[customization.point.object]](customization.point.object "16.3.3.3.5 Customization Point Object types"))[.](#2.sentence-1)

Given subexpressions E and F, the expressionsviews​::​iota(E) and views​::​iota(E, F) are expression-equivalent toiota_view<decay_t<decltype((E))>>(E) and iota_view(E, F),
respectively[.](#2.sentence-2)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L2792)

[*Example [1](#example-1)*: for (int i : views::iota(1, 10)) cout << i << ' '; // prints 1 2 3 4 5 6 7 8 9 — *end example*]

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L2800)

The name views​::​indices denotes a
customization point object ([[customization.point.object]](customization.point.object "16.3.3.3.5 Customization Point Object types"))[.](#4.sentence-1)

Given subexpression E,
let T be remove_cvref_t<decltype((E))>[.](#4.sentence-2)

views​::​indices(E) is expression-equivalent toviews​::​iota(T(0), E) if *is-integer-like*<T> is true,
and ill-formed otherwise[.](#4.sentence-3)