[range.join.overview]

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

## 25.7 Range adaptors [[range.adaptors]](range.adaptors#range.join.overview)

### 25.7.14 Join view [[range.join]](range.join#overview)

#### 25.7.14.1 Overview [range.join.overview]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L6650)

join_view flattens a view of ranges into a view[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L6653)

The name views​::​join denotes a
range adaptor object ([[range.adaptor.object]](range.adaptor.object "25.7.2 Range adaptor objects"))[.](#2.sentence-1)

Given a subexpression E, the expressionviews​::​join(E) is expression-equivalent tojoin_view<views​::​all_t<decltype((E))>>{E}[.](#2.sentence-2)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L6661)

[*Example [1](#example-1)*: vector<string> ss{"hello", " ", "world", "!"};for (char ch : ss | views::join) cout << ch; // prints hello world! — *end example*]