[stoptoken.mem]

# 32 Concurrency support library [[thread]](./#thread)

## 32.3 Stop tokens [[thread.stoptoken]](thread.stoptoken#stoptoken.mem)

### 32.3.4 Class stop_token [[stoptoken]](stoptoken#mem)

#### 32.3.4.2 Member functions [stoptoken.mem]

[🔗](#lib:swap,stop_token)

`void swap(stop_token& rhs) noexcept;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L868)

*Effects*: Equivalent to:*stop-state*.swap(rhs.*stop-state*);

[🔗](#lib:stop_requested,stop_token)

`bool stop_requested() const noexcept;
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L882)

*Returns*: true if *stop-state* refers to a stop state
that has received a stop request;
otherwise, false[.](#2.sentence-1)

[🔗](#lib:stop_possible,stop_token)

`bool stop_possible() const noexcept;
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L895)

*Returns*: false if

- [(3.1)](#3.1)

*this is disengaged, or

- [(3.2)](#3.2)

a stop request was not made
 and there are no associated stop_source objects;

otherwise, true[.](#3.sentence-1)