Experimental library header <experimental/execution>

namespace std {
  // ヘルパーコンセプト
  template<class T>
    concept /*movable-value*/ = /*下記参照*/; // 説明専用
  template<class From, class To>
    concept /*decays-to*/ = same_as<decay_t<From>, To>; // 説明専用
  template<class T>
    concept /*クラス型*/ = /*decays-to*/<T, T> && is_class_v<T>;  // 説明専用
  // クエリ可能なオブジェクト
  template<class T>
    concept queryable = destructible;
  // クエリ
  namespace queries { // 説明専用
    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 /*転送クエリ*/ = // 説明専用
      forwarding_query(T{});
  namespace /*実行環境*/ { // 説明専用
    struct empty_env {};
    struct get_env_t;
  }
  using /*実行環境*/::empty_env;
  using /*実行環境*/::get_env_t;
  inline constexpr get_env_t get_env {};
  template<class T>
    using env_of_t = decltype(get_env(declval<T>()));
}
namespace std::実行 {
  // クエリ
  enum class forward_progress_guarantee;
  namespace queries { // 説明専用
    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{};
  // スケジューラ
  template<class S>
    concept scheduler = /*下記参照*/;
  // レシーバー
  template<class R>
    inline constexpr bool enable_receiver = /*下記参照*/;
  template<class R>
    concept receiver = /*下記参照*/;
  template<class R, class Completions>
    concept receiver_of = /*下記参照*/;
  namespace receivers { // 説明専用
    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{};
  // 操作状態
  template<class O>
    concept operation_state = /*下記参照*/;
  namespace /*op-state*/ { // 説明専用
    struct start_t;
  }
  using /*op-state*/::start_t;
  inline constexpr start_t start{};
  // 送信側
  template<class S>
    inline constexpr bool enable_sender = /* 説明を参照 */;
  template<class S>
    concept sender = /*下記参照*/;
  template<class S, class E = empty_env>
    concept sender_in = /*下記参照*/;
  template<class S, class R>
    concept sender_to = /*下記参照*/;
  template <class S, class Sig, class E = empty_env>
    concept sender_of = /* 説明を参照 */;
  template<class... Ts>
    struct /*型リスト*/; // 説明専用
  template<class S, class E = empty_env>
    using /*single-sender-value-type*/ = /* 説明を参照 */; // 説明専用
  template<class S, class E = empty_env>
    concept /*シングルセンダー*/ = /* 説明を参照 */; // 説明専用
  // 完了シグネチャ
  namespace /*補完シグネチャ*/ { // 説明専用
    struct get_completion_signatures_t;
  }
  using /*完了シグネチャ*/::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>...>; // 説明専用
  template<class... Ts>
    using /*variant-or-empty*/ = /* 説明を参照 */; // 説明専用
  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 = /* 説明を参照 */;
  template<class S,
           class Env = empty_env,
           template<class...> class Variant = /*variant-or-empty*/>
      requires sender_in<S, E>
    using error_types_of_t = /* 説明を参照 */;
  template<class S, class E = empty_env>
      requires sender_in<S, E>
    inline constexpr bool sends_stopped = /* 説明を参照 */;
  // コネクト送信者アルゴリズム
  namespace /*senders-connect*/ { // 説明専用
    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>()));
  // 送信側ファクトリ
  namespace /*senders-factories*/ { // 説明専用
    struct schedule_t;
    struct transfer_just_t;
  }
  inline constexpr /* 未指定 */ just{};
  inline constexpr /* 未指定 */ just_error{};
  inline constexpr /* 未指定 */ 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 /* 未指定 */ read{};
  template<scheduler S>
    using schedule_result_t = decltype(schedule(declval<S>()));
  // 送信側アダプタ
  namespace /*sender-adaptor-closure*/ { // 説明専用
    template</*クラス型*/ D>
      struct sender_adaptor_closure { };
  }
  using /*sender-adaptor-closure*/::sender_adaptor_closure;
  namespace /*sender-adaptors*/ { // 説明専用
    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{};
  // 送信側コンシューマ
  namespace /*送信者-消費者*/ { // 説明専用
    struct start_detached_t;
  }
  using /*送信者-消費者*/::start_detached_t;
  inline constexpr start_detached_t start_detached{};
  // 送信側と受信側のユーティリティ
  // [exec.utils.rcvr.adptr]
  template<
      /*クラス型*/ Derived,
      receiver Base = /* 未指定 */> // 引数は関連付けられたエンティティではない
    class receiver_adaptor;
  template<class Fn>
    concept /*完了シグネチャ*/ = // 説明専用
      /* 説明を参照 */;
  // [exec.utils.cmplsigs]
  template</*完了シグネチャ*/... Fns>
    struct completion_signatures {};
  template<class... Args> // 説明専用
    using /*デフォルト設定値*/ =
      completion_signatures<set_value_t(Args...)>;
  template<class Err> // 説明専用
    using /*デフォルト設定エラー*/ =
      completion_signatures<set_error_t(Err)>;
  template<class Sigs> // 説明専用
    concept /*有効な完了シグネチャ*/ = /* 説明を参照 */;
  // [exec.utils.mkcmplsigs]
  template<
    sender Sndr,
    class Env = empty_env,
    /*有効な完了シグネチャ*/ AddlSigs = completion_signatures<>,
    template<class...> class SetValue = /* 説明を参照 */,
    template<class> class SetError = /* 説明を参照 */,
    /*有効な完了シグネチャ*/ SetStopped = completion_signatures<set_stopped_t()>>
      requires sender_in<Sndr, Env>
  using make_completion_signatures = completion_signatures</* 詳細は説明を参照 */>;
  // 実行リソース
  class run_loop;
}
namespace std::this_thread {
  // クエリ
  namespace queries { // 説明専用
    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 /*このスレッド*/ { // 説明専用
    struct /*sync-wait-env*/; // 説明専用
    template<class S>
        requires sender_in<S, /*sync-wait-env*/>
      using /*同期待機型*/ = /*下記参照*/; // 説明専用
    template<class S>
      using /*sync-wait-with-variant-type*/ = /*下記参照*/; // 説明専用
    struct sync_wait_t;
    struct sync_wait_with_variant_t;
  }
  using /*このスレッド*/::sync_wait_t;
  using /*このスレッド*/::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::実行 {
  // 一方向実行
  namespace execute { // 説明専用
    struct execute_t;
  }
  using execute::execute_t;
  inline constexpr execute_t execute{};
  // [exec.as.awaitable]
  namespace /*coro-utils*/ { // 説明専用
    struct as_awaitable_t;
  }
  using /*coro-utils*/::as_awaitable_t;
  inline constexpr as_awaitable_t as_awaitable;
  // [exec.with.awaitable.senders]
  template</*クラス型*/ Promise>
    struct with_awaitable_senders;
}