[stopsource.mem]

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

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

### 32.3.5 Class stop_source [[stopsource]](stopsource#mem)

#### 32.3.5.3 Member functions [stopsource.mem]

[🔗](#lib:swap,stop_source)

`void swap(stop_source& rhs) noexcept;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L976)

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

[🔗](#lib:get_token,stop_source)

`stop_token get_token() const noexcept;
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L990)

*Returns*: stop_token() if stop_possible() is false;
otherwise a new associated stop_token object;
i.e., its *stop-state* member is equal to
the *stop-state* member of *this[.](#2.sentence-1)

[🔗](#lib:stop_possible,stop_source)

`bool stop_possible() const noexcept;
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L1004)

*Returns*: *stop-state* != nullptr[.](#3.sentence-1)

[🔗](#lib:stop_requested,stop_source)

`bool stop_requested() const noexcept;
`

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L1015)

*Returns*: true if *stop-state* refers to a stop state
that has received a stop request;
otherwise, false[.](#4.sentence-1)

[🔗](#lib:request_stop,stop_source)

`bool request_stop() noexcept;
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L1028)

*Effects*: Executes a stop request operation ([[stoptoken.concepts]](stoptoken.concepts "32.3.3 Stop token concepts")) on
the associated stop state, if any[.](#5.sentence-1)