33 Concurrency support library [thread]

33.3 Stop tokens [thread.stoptoken]

33.3.7 Class never_stop_token [stoptoken.never]

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The class never_stop_token models the unstoppable_token concept.
It provides a stop token interface, but also provides static information that a stop is never possible nor requested.
namespace std { class never_stop_token { struct callback-type { // exposition only explicit callback-type(never_stop_token, auto&&) noexcept {} }; public: template<class> using callback_type = callback-type; static constexpr bool stop_requested() noexcept { return false; } static constexpr bool stop_possible() noexcept { return false; } bool operator==(const never_stop_token&) const = default; }; }