[stopcallback.inplace.cons]

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

## 32.3 Stop tokens [[thread.stoptoken]](thread.stoptoken#stopcallback.inplace.cons)

### 32.3.10 Class template inplace_stop_callback [[stopcallback.inplace]](stopcallback.inplace#cons)

#### 32.3.10.2 Constructors and destructor [stopcallback.inplace.cons]

[🔗](#itemdecl:1)

`template<class Initializer>
  explicit inplace_stop_callback(inplace_stop_token st, Initializer&& init)
    noexcept(is_nothrow_constructible_v<CallbackFn, Initializer>);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L1381)

*Constraints*: [constructible_from](concept.constructible#concept:constructible_from "18.4.11 Concept constructible_­from [concept.constructible]")<CallbackFn, Initializer> is satisfied[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L1385)

*Effects*: Initializes *callback-fn* with std​::​forward<Initializer>(init) and executes a stoppable callback registration ([[stoptoken.concepts]](stoptoken.concepts "32.3.3 Stop token concepts"))[.](#2.sentence-1)

[🔗](#itemdecl:2)

`~inplace_stop_callback();
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/threads.tex#L1396)

*Effects*: Executes a stoppable callback deregistration ([[stoptoken.concepts]](stoptoken.concepts "32.3.3 Stop token concepts"))[.](#3.sentence-1)