Experimental library header <experimental/execution>

namespace std {
  // helper concepts
  template<class T>
    concept /*movable-value*/ = /*아래-참조*/; // 설명 전용
  template<class From, class To>
    concept /*decays-to*/ = same_as<decay_t<From>, To>; // 설명 전용
  template<class T>
    concept /*클래스 타입*/ = /*decays-to*/<T, T> && is_class_v<T>;  // 설명 전용
  // 쿼리 가능한 객체
  template<class T>
    concept queryable = destructible;
  // 쿼리
  namespace queries { // 설명 전용
    struct forwarding_query_t;
    struct get_allocator_t;
    struct get_stop_token_t;
  }
  using queries::forwarding_query_t;
  using queries::get_allocator_t;
  using queries::get_stop_token_t;
  inline constexpr forwarding_query_t forwarding_query{};
  inline constexpr get_allocator_t get_allocator{};
  inline constexpr get_stop_token_t get_stop_token{};
  template<class T>
    using stop_token_of_t =
      remove_cvref_t<decltype(get_stop_token(declval<T>()))>;
  template<class T>
    concept /*전달-쿼리*/ = // 설명 전용
      forwarding_query(T{});
  namespace /*실행-환경*/ { // 설명 전용
    struct empty_env {};
    struct get_env_t;
  }
  using /*실행 환경*/::empty_env;
  using /*실행 환경*/::get_env_t;
  inline constexpr get_env_t get_env {};
  template<class T>
    using env_of_t = decltype(get_env(declval<T>()));
}
namespace std::실행 {
  // queries
  enum class forward_progress_guarantee;
  namespace queries { // 설명 전용
    struct get_scheduler_t;
    struct get_delegatee_scheduler_t;
    struct get_forward_progress_guarantee_t;
    template<class CPO>
      struct get_completion_scheduler_t;
  }
  using queries::get_scheduler_t;
  using queries::get_delegatee_scheduler_t;
  using queries::get_forward_progress_guarantee_t;
  using queries::get_completion_scheduler_t;
  inline constexpr get_scheduler_t get_scheduler{};
  inline constexpr get_delegatee_scheduler_t get_delegatee_scheduler{};
  inline constexpr get_forward_progress_guarantee_t get_forward_progress_guarantee{};
  template<class CPO>
    inline constexpr get_completion_scheduler_t<CPO> get_completion_scheduler{};
  // 스케줄러
  template<class S>
    concept scheduler = /*아래-참조*/;
  // receivers
  template<class R>
    inline constexpr bool enable_receiver = /*아래-참조*/;
  template<class R>
    concept receiver = /*아래-참조*/;
  template<class R, class Completions>
    concept receiver_of = /*아래-참조*/;
  namespace receivers { // 설명 전용
    struct set_value_t;
    struct set_error_t;
    struct set_stopped_t;
  }
  using receivers::set_value_t;
  using receivers::set_error_t;
  using receivers::set_stopped_t;
  inline constexpr set_value_t set_value{};
  inline constexpr set_error_t set_error{};
  inline constexpr set_stopped_t set_stopped{};
  // 연산 상태
  template<class O>
    concept operation_state = /*아래-참조*/;
  namespace /*작동 상태*/ { // 설명 전용
    struct start_t;
  }
  using /*op-state*/::start_t;
  inline constexpr start_t start{};
  // 발신자
  template<class S>
    inline constexpr bool enable_sender = /* 설명 참조 */;
  template<class S>
    concept sender = /*아래-참조*/;
  template<class S, class E = empty_env>
    concept sender_in = /*아래-참조*/;
  template<class S, class R>
    concept sender_to = /*아래-참조*/;
  template <class S, class Sig, class E = empty_env>
    concept sender_of = /* 설명 참조 */;
  template<class... Ts>
    struct /*type-list*/; // 설명 전용
  template<class S, class E = empty_env>
    using /*single-sender-value-type*/ = /* 설명 참조 */; // 설명 전용
  template<class S, class E = empty_env>
    concept /*단일-송신자*/ = /* 설명 참조 */; // 설명 전용
  // completion signatures
  namespace /*완료 시그니처*/ { // 설명 전용
    struct get_completion_signatures_t;
  }
  using /*완료 시그니처*/::get_completion_signatures_t;
  inline constexpr get_completion_signatures_t get_completion_signatures {};
  template<class S, class E = empty_env>
      requires sender_in<S, E>
    using completion_signatures_of_t = /*call-result-t*/<get_completion_signatures_t, S, E>;
  template<class... Ts>
    using /*decayed-tuple*/ = tuple<decay_t<Ts>...>; // 설명 전용
  template<class... Ts>
    using /*variant-or-empty*/ = /* 설명 참조 */; // 설명 전용
  template<class S,
           class E = empty_env,
           template<class...> class Tuple = /*decayed-tuple*/,
           template<class...> class Variant = /*variant-or-empty*/>
      requires sender_in<S, E>
    using value_types_of_t = /* 설명 참조 */;
  template<class S,
           class Env = empty_env,
           template<class...> class Variant = /*variant-or-empty*/>
      requires sender_in<S, E>
    using error_types_of_t = /* 설명 참조 */;
  template<class S, class E = empty_env>
      requires sender_in<S, E>
    inline constexpr bool sends_stopped = /* 설명 참조 */;
  // the connect sender algorithm
  namespace /*senders-connect*/ { // 설명 전용
    struct connect_t;
  }
  using /*senders-connect*/::connect_t;
  inline constexpr connect_t connect{};
  template<class S, class R>
    using connect_result_t = decltype(connect(declval<S>(), declval<R>()));
  // sender factories
  namespace /*senders-factories*/ { // 설명 전용
    struct schedule_t;
    struct transfer_just_t;
  }
  inline constexpr /* 지정되지 않음 */ just{};
  inline constexpr /* 지정되지 않음 */ just_error{};
  inline constexpr /* 미지정 */ just_stopped{};
  using /*senders-factories*/::schedule_t;
  using /*senders-factories*/::transfer_just_t;
  inline constexpr schedule_t schedule{};
  inline constexpr transfer_just_t transfer_just{};
  inline constexpr /* 지정되지 않음 */ read{};
  template<scheduler S>
    using schedule_result_t = decltype(schedule(declval<S>()));
  // sender adaptors
  namespace /*sender-adaptor-closure*/ { // 설명 전용
    template</*클래스 타입*/ D>
      struct sender_adaptor_closure { };
  }
  using /*sender-adaptor-closure*/::sender_adaptor_closure;
  namespace /*sender-adaptors*/ { // 설명 전용
    struct on_t;
    struct transfer_t;
    struct schedule_from_t;
    struct then_t;
    struct upon_error_t;
    struct upon_stopped_t;
    struct let_value_t;
    struct let_error_t;
    struct let_stopped_t;
    struct bulk_t;
    struct split_t;
    struct when_all_t;
    struct when_all_with_variant_t;
    struct transfer_when_all_t;
    struct transfer_when_all_with_variant_t;
    struct into_variant_t;
    struct stopped_as_optional_t;
    struct stopped_as_error_t;
    struct ensure_started_t;
  }
  using /*sender-adaptors*/::on_t;
  using /*sender-adaptors*/::transfer_t;
  using /*sender-adaptors*/::schedule_from_t;
  using /*sender-adaptors*/::then_t;
  using /*sender-adaptors*/::upon_error_t;
  using /*sender-adaptors*/::upon_stopped_t;
  using /*sender-adaptors*/::let_value_t;
  using /*sender-adaptors*/::let_error_t;
  using /*sender-adaptors*/::let_stopped_t;
  using /*sender-adaptors*/::bulk_t;
  using /*sender-adaptors*/::split_t;
  using /*sender-adaptors*/::when_all_t;
  using /*sender-adaptors*/::when_all_with_variant_t;
  using /*sender-adaptors*/::transfer_when_all_t;
  using /*sender-adaptors*/::transfer_when_all_with_variant_t;
  using /*sender-adaptors*/::into_variant_t;
  using /*sender-adaptors*/::stopped_as_optional_t;
  using /*sender-adaptors*/::stopped_as_error_t;
  using /*sender-adaptors*/::ensure_started_t;
  inline constexpr on_t on{};
  inline constexpr transfer_t transfer{};
  inline constexpr schedule_from_t schedule_from{};
  inline constexpr then_t then{};
  inline constexpr upon_error_t upon_error{};
  inline constexpr upon_stopped_t upon_stopped{};
  inline constexpr let_value_t let_value{};
  inline constexpr let_error_t let_error{};
  inline constexpr let_stopped_t let_stopped{};
  inline constexpr bulk_t bulk{};
  inline constexpr split_t split{};
  inline constexpr when_all_t when_all{};
  inline constexpr when_all_with_variant_t when_all_with_variant{};
  inline constexpr transfer_when_all_t transfer_when_all{};
  inline constexpr transfer_when_all_with_variant_t
    transfer_when_all_with_variant{};
  inline constexpr into_variant_t into_variant{};
  inline constexpr stopped_as_optional_t stopped_as_optional;
  inline constexpr stopped_as_error_t stopped_as_error;
  inline constexpr ensure_started_t ensure_started{};
  // sender consumers
  namespace /*sender-consumers*/ { // 설명 전용
    struct start_detached_t;
  }
  using /*sender-consumers*/::start_detached_t;
  inline constexpr start_detached_t start_detached{};
  // 송신자 및 수신자 유틸리티
  // [exec.utils.rcvr.adptr]
  template<
      /*클래스 타입*/ Derived,
      receiver Base = /* 미지정 */> // 인수는 연관된 엔티티가 아닙니다
    class receiver_adaptor;
  template<class Fn>
    concept /*완료-시그니처*/ = // 설명 전용
      /* 설명 참조 */;
  // [exec.utils.cmplsigs]
  template</*완료-시그니처*/... Fns>
    struct completion_signatures {};
  template<class... Args> // 설명 전용
    using /*기본-설정-값*/ =
      completion_signatures<set_value_t(Args...)>;
  template<class Err> // 설명 전용
    using /*기본-설정-오류*/ =
      completion_signatures<set_error_t(Err)>;
  template<class Sigs> // 설명 전용
    concept /*valid-completion-signatures*/ = /* 설명 참조 */;
  // [exec.utils.mkcmplsigs]
  template<
    sender Sndr,
    class Env = empty_env,
    /*valid-completion-signatures*/ AddlSigs = completion_signatures<>,
    template<class...> class SetValue = /* 설명 참조 */,
    template<class> class SetError = /* 설명 참조 */,
    /*valid-completion-signatures*/ SetStopped = completion_signatures<set_stopped_t()>>
      requires sender_in<Sndr, Env>
  using make_completion_signatures = completion_signatures</* 설명 참조 */>;
  // 실행 리소스
  class run_loop;
}
namespace std::this_thread {
  // 쿼리
  namespace queries { // 설명 전용
    struct execute_may_block_caller_t;
  }
  using queries::execute_may_block_caller_t;
  inline constexpr execute_may_block_caller_t execute_may_block_caller{};
  namespace /*현재-스레드*/ { // 설명 전용
    struct /*sync-wait-env*/; // 설명 전용
    template<class S>
        requires sender_in<S, /*sync-wait-env*/>
      using /*sync-wait-type*/ = /*아래-참조*/; // 설명 전용
    template<class S>
      using /*sync-wait-with-variant-type*/ = /*아래-참조*/; // 설명 전용
    struct sync_wait_t;
    struct sync_wait_with_variant_t;
  }
  using /*현재-스레드*/::sync_wait_t;
  using /*현재-스레드*/::sync_wait_with_variant_t;
  inline constexpr sync_wait_t sync_wait{};
  inline constexpr sync_wait_with_variant_t sync_wait_with_variant{};
}
namespace std::실행 {
  // 단방향 실행
  namespace execute { // 설명 전용
    struct execute_t;
  }
  using execute::execute_t;
  inline constexpr execute_t execute{};
  // [exec.as.awaitable]
  namespace /*코루틴 유틸리티*/ { // 설명 전용
    struct as_awaitable_t;
  }
  using /*코루틴 유틸리티*/::as_awaitable_t;
  inline constexpr as_awaitable_t as_awaitable;
  // [exec.with.awaitable.senders]
  template</*클래스 타입*/ Promise>
    struct with_awaitable_senders;
}