[coroutine.generator.overview]

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

## 25.8 Range generators [[coro.generator]](coro.generator#coroutine.generator.overview)

### 25.8.1 Overview [coroutine.generator.overview]

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L18041)

Class template generator presents
a view of the elements yielded by the evaluation of a coroutine[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L18045)

A generator generates a sequence of elements by
repeatedly resuming the coroutine from which it was returned[.](#2.sentence-1)

Elements of the sequence are produced by the coroutine
each time a co_yield statement is evaluated[.](#2.sentence-2)

When the co_yield statement is of the formco_yield elements_of(r),
each element of the range r is successively produced as an element of the sequence[.](#2.sentence-3)

[*Example [1](#example-1)*: generator<int> ints(int start = 0) {while (true)co_yield start++;}void f() {for (auto i : ints() | views::take(3)) cout << i << ' '; // prints 0 1 2} — *end example*]