[stopcallback.cons]

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template<class Initializer>
  explicit stop_callback(const stop_token& st, Initializer&& init)
    noexcept(is_nothrow_constructible_v<CallbackFn, Initializer>);

template<class Initializer>
  explicit stop_callback(stop_token&& st, Initializer&& init)
    noexcept(is_nothrow_constructible_v<CallbackFn, Initializer>);

Constraints: CallbackFn and Initializer satisfy constructible_from<CallbackFn, Initializer>.

Effects: Initializes callback-fn with std::forward<Initializer>(init) and executes a stoppable callback registration ([stoptoken.concepts]).

If a callback is registered with st's shared stop state, then *this acquires shared ownership of that stop state.

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~stop_callback();

Effects: Executes a stoppable callback deregistration ([stoptoken.concepts]) and releases ownership of the stop state, if any.

32 Concurrency support library [thread]

32.3 Stop tokens [thread.stoptoken]

32.3.6 Class template stop_callback [stopcallback]

32.3.6.2 Constructors and destructor [stopcallback.cons]