std::stop_callback_for_t - cppreference.com

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`template< class T, class CallbackFn > using stop_callback_for_t = T::template callback_type<CallbackFn>;`		(since C++26)

The alias template stop_callback_for_t is used to obtain the stop callback type of the type T.

The corresponding stop_callback_for_t for standard stop token types and any valid CallbackFn are:

specialization of std::stop_callback for std::stop_token,
specialization of std::inplace_stop_callback for std::inplace_stop_token, and
unspecified type without stoppable callback registration and deregistration for std::never_stop_token.