text: //
  // execution/bulk_guarantee.hpp
  // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  //
  // Copyright (c) 2003-2022 Christopher M. Kohlhoff (chris at kohlhoff dot com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  
  #ifndef BOOST_ASIO_EXECUTION_BULK_GUARANTEE_HPP
  #define BOOST_ASIO_EXECUTION_BULK_GUARANTEE_HPP
  
  #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  # pragma once
  #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  
  #include <boost/asio/detail/config.hpp>
  #include <boost/asio/detail/type_traits.hpp>
  #include <boost/asio/execution/executor.hpp>
  #include <boost/asio/execution/scheduler.hpp>
  #include <boost/asio/execution/sender.hpp>
  #include <boost/asio/is_applicable_property.hpp>
  #include <boost/asio/query.hpp>
  #include <boost/asio/traits/query_free.hpp>
  #include <boost/asio/traits/query_member.hpp>
  #include <boost/asio/traits/query_static_constexpr_member.hpp>
  #include <boost/asio/traits/static_query.hpp>
  #include <boost/asio/traits/static_require.hpp>
  
  #include <boost/asio/detail/push_options.hpp>
  
  namespace boost {
  namespace asio {
  
  #if defined(GENERATING_DOCUMENTATION)
  
  namespace execution {
  
  /// A property to communicate the forward progress and ordering guarantees of
  /// execution agents associated with the bulk execution.
  struct bulk_guarantee_t
  {
    /// The bulk_guarantee_t property applies to executors, senders, and
    /// schedulers.
    template <typename T>
    static constexpr bool is_applicable_property_v =
      is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
  
    /// The top-level bulk_guarantee_t property cannot be required.
    static constexpr bool is_requirable = false;
  
    /// The top-level bulk_guarantee_t property cannot be preferred.
    static constexpr bool is_preferable = false;
  
    /// The type returned by queries against an @c any_executor.
    typedef bulk_guarantee_t polymorphic_query_result_type;
  
    /// A sub-property that indicates that execution agents within the same bulk
    /// execution may be parallelised and vectorised.
    struct unsequenced_t
    {
      /// The bulk_guarantee_t::unsequenced_t property applies to executors,
      /// senders, and schedulers.
      template <typename T>
      static constexpr bool is_applicable_property_v =
        is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
  
      /// The bulk_guarantee_t::unsequenced_t property can be required.
      static constexpr bool is_requirable = true;
  
      /// The bulk_guarantee_t::unsequenced_t property can be preferred.
      static constexpr bool is_preferable = true;
  
      /// The type returned by queries against an @c any_executor.
      typedef bulk_guarantee_t polymorphic_query_result_type;
  
      /// Default constructor.
      constexpr unsequenced_t();
  
      /// Get the value associated with a property object.
      /**
       * @returns unsequenced_t();
       */
      static constexpr bulk_guarantee_t value();
    };
  
    /// A sub-property that indicates that execution agents within the same bulk
    /// execution may not be parallelised and vectorised.
    struct sequenced_t
    {
      /// The bulk_guarantee_t::sequenced_t property applies to executors,
      /// senders, and schedulers.
      template <typename T>
      static constexpr bool is_applicable_property_v =
        is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
  
      /// The bulk_guarantee_t::sequenced_t property can be required.
      static constexpr bool is_requirable = true;
  
      /// The bulk_guarantee_t::sequenced_t property can be preferred.
      static constexpr bool is_preferable = true;
  
      /// The type returned by queries against an @c any_executor.
      typedef bulk_guarantee_t polymorphic_query_result_type;
  
      /// Default constructor.
      constexpr sequenced_t();
  
      /// Get the value associated with a property object.
      /**
       * @returns sequenced_t();
       */
      static constexpr bulk_guarantee_t value();
    };
  
    /// A sub-property that indicates that execution agents within the same bulk
    /// execution may be parallelised.
    struct parallel_t
    {
      /// The bulk_guarantee_t::parallel_t property applies to executors,
      /// senders, and schedulers.
      template <typename T>
      static constexpr bool is_applicable_property_v =
        is_executor_v<T> || is_sender_v<T> || is_scheduler_v<T>;
  
      /// The bulk_guarantee_t::parallel_t property can be required.
      static constexpr bool is_requirable = true;
  
      /// The bulk_guarantee_t::parallel_t property can be preferred.
      static constexpr bool is_preferable = true;
  
      /// The type returned by queries against an @c any_executor.
      typedef bulk_guarantee_t polymorphic_query_result_type;
  
      /// Default constructor.
      constexpr parallel_t();
  
      /// Get the value associated with a property object.
      /**
       * @returns parallel_t();
       */
      static constexpr bulk_guarantee_t value();
    };
  
    /// A special value used for accessing the bulk_guarantee_t::unsequenced_t
    /// property.
    static constexpr unsequenced_t unsequenced;
  
    /// A special value used for accessing the bulk_guarantee_t::sequenced_t
    /// property.
    static constexpr sequenced_t sequenced;
  
    /// A special value used for accessing the bulk_guarantee_t::parallel_t
    /// property.
    static constexpr parallel_t parallel;
  
    /// Default constructor.
    constexpr bulk_guarantee_t();
  
    /// Construct from a sub-property value.
    constexpr bulk_guarantee_t(unsequenced_t);
  
    /// Construct from a sub-property value.
    constexpr bulk_guarantee_t(sequenced_t);
  
    /// Construct from a sub-property value.
    constexpr bulk_guarantee_t(parallel_t);
  
    /// Compare property values for equality.
    friend constexpr bool operator==(
        const bulk_guarantee_t& a, const bulk_guarantee_t& b) noexcept;
  
    /// Compare property values for inequality.
    friend constexpr bool operator!=(
        const bulk_guarantee_t& a, const bulk_guarantee_t& b) noexcept;
  };
  
  /// A special value used for accessing the bulk_guarantee_t property.
  constexpr bulk_guarantee_t bulk_guarantee;
  
  } // namespace execution
  
  #else // defined(GENERATING_DOCUMENTATION)
  
  namespace execution {
  namespace detail {
  namespace bulk_guarantee {
  
  template <int I> struct unsequenced_t;
  template <int I> struct sequenced_t;
  template <int I> struct parallel_t;
  
  } // namespace bulk_guarantee
  
  template <int I = 0>
  struct bulk_guarantee_t
  {
  #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
    template <typename T>
    BOOST_ASIO_STATIC_CONSTEXPR(bool,
      is_applicable_property_v = (
        is_executor<T>::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_sender<T>
            >::type::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_scheduler<T>
            >::type::value));
  #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = false);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
    typedef bulk_guarantee_t polymorphic_query_result_type;
  
    typedef detail::bulk_guarantee::unsequenced_t<I> unsequenced_t;
    typedef detail::bulk_guarantee::sequenced_t<I> sequenced_t;
    typedef detail::bulk_guarantee::parallel_t<I> parallel_t;
  
    BOOST_ASIO_CONSTEXPR bulk_guarantee_t()
      : value_(-1)
    {
    }
  
    BOOST_ASIO_CONSTEXPR bulk_guarantee_t(unsequenced_t)
      : value_(0)
    {
    }
  
    BOOST_ASIO_CONSTEXPR bulk_guarantee_t(sequenced_t)
      : value_(1)
    {
    }
  
    BOOST_ASIO_CONSTEXPR bulk_guarantee_t(parallel_t)
      : value_(2)
    {
    }
  
    template <typename T>
    struct proxy
    {
  #if defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
      struct type
      {
        template <typename P>
        auto query(BOOST_ASIO_MOVE_ARG(P) p) const
          noexcept(
            noexcept(
              declval<typename conditional<true, T, P>::type>().query(
                BOOST_ASIO_MOVE_CAST(P)(p))
            )
          )
          -> decltype(
            declval<typename conditional<true, T, P>::type>().query(
              BOOST_ASIO_MOVE_CAST(P)(p))
          );
      };
  #else // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
      typedef T type;
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
    };
  
    template <typename T>
    struct static_proxy
    {
  #if defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
      struct type
      {
        template <typename P>
        static constexpr auto query(BOOST_ASIO_MOVE_ARG(P) p)
          noexcept(
            noexcept(
              conditional<true, T, P>::type::query(BOOST_ASIO_MOVE_CAST(P)(p))
            )
          )
          -> decltype(
            conditional<true, T, P>::type::query(BOOST_ASIO_MOVE_CAST(P)(p))
          )
        {
          return T::query(BOOST_ASIO_MOVE_CAST(P)(p));
        }
      };
  #else // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
      typedef T type;
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
    };
  
    template <typename T>
    struct query_member :
      traits::query_member<typename proxy<T>::type, bulk_guarantee_t> {};
  
    template <typename T>
    struct query_static_constexpr_member :
      traits::query_static_constexpr_member<
        typename static_proxy<T>::type, bulk_guarantee_t> {};
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename query_static_constexpr_member<T>::result_type
    static_query()
      BOOST_ASIO_NOEXCEPT_IF((
        query_static_constexpr_member<T>::is_noexcept))
    {
      return query_static_constexpr_member<T>::value();
    }
  
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename traits::static_query<T, unsequenced_t>::result_type
    static_query(
        typename enable_if<
          !query_static_constexpr_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !query_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          traits::static_query<T, unsequenced_t>::is_valid
        >::type* = 0) BOOST_ASIO_NOEXCEPT
    {
      return traits::static_query<T, unsequenced_t>::value();
    }
  
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename traits::static_query<T, sequenced_t>::result_type
    static_query(
        typename enable_if<
          !query_static_constexpr_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !query_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !traits::static_query<T, unsequenced_t>::is_valid
        >::type* = 0,
        typename enable_if<
          traits::static_query<T, sequenced_t>::is_valid
        >::type* = 0) BOOST_ASIO_NOEXCEPT
    {
      return traits::static_query<T, sequenced_t>::value();
    }
  
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename traits::static_query<T, parallel_t>::result_type
    static_query(
        typename enable_if<
          !query_static_constexpr_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !query_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !traits::static_query<T, unsequenced_t>::is_valid
        >::type* = 0,
        typename enable_if<
          !traits::static_query<T, sequenced_t>::is_valid
        >::type* = 0,
        typename enable_if<
          traits::static_query<T, parallel_t>::is_valid
        >::type* = 0) BOOST_ASIO_NOEXCEPT
    {
      return traits::static_query<T, parallel_t>::value();
    }
  
    template <typename E,
        typename T = decltype(bulk_guarantee_t::static_query<E>())>
    static BOOST_ASIO_CONSTEXPR const T static_query_v
      = bulk_guarantee_t::static_query<E>();
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const bulk_guarantee_t& a, const bulk_guarantee_t& b)
    {
      return a.value_ == b.value_;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const bulk_guarantee_t& a, const bulk_guarantee_t& b)
    {
      return a.value_ != b.value_;
    }
  
    struct convertible_from_bulk_guarantee_t
    {
      BOOST_ASIO_CONSTEXPR convertible_from_bulk_guarantee_t(bulk_guarantee_t) {}
    };
  
    template <typename Executor>
    friend BOOST_ASIO_CONSTEXPR bulk_guarantee_t query(
        const Executor& ex, convertible_from_bulk_guarantee_t,
        typename enable_if<
          can_query<const Executor&, unsequenced_t>::value
        >::type* = 0)
  #if !defined(__clang__) // Clang crashes if noexcept is used here.
  #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified.
      BOOST_ASIO_NOEXCEPT_IF((
        is_nothrow_query<const Executor&,
          bulk_guarantee_t<>::unsequenced_t>::value))
  #else // defined(BOOST_ASIO_MSVC)
      BOOST_ASIO_NOEXCEPT_IF((
        is_nothrow_query<const Executor&, unsequenced_t>::value))
  #endif // defined(BOOST_ASIO_MSVC)
  #endif // !defined(__clang__)
    {
      return boost::asio::query(ex, unsequenced_t());
    }
  
    template <typename Executor>
    friend BOOST_ASIO_CONSTEXPR bulk_guarantee_t query(
        const Executor& ex, convertible_from_bulk_guarantee_t,
        typename enable_if<
          !can_query<const Executor&, unsequenced_t>::value
        >::type* = 0,
        typename enable_if<
          can_query<const Executor&, sequenced_t>::value
        >::type* = 0)
  #if !defined(__clang__) // Clang crashes if noexcept is used here.
  #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified.
      BOOST_ASIO_NOEXCEPT_IF((
        is_nothrow_query<const Executor&,
          bulk_guarantee_t<>::sequenced_t>::value))
  #else // defined(BOOST_ASIO_MSVC)
      BOOST_ASIO_NOEXCEPT_IF((
        is_nothrow_query<const Executor&, sequenced_t>::value))
  #endif // defined(BOOST_ASIO_MSVC)
  #endif // !defined(__clang__)
    {
      return boost::asio::query(ex, sequenced_t());
    }
  
    template <typename Executor>
    friend BOOST_ASIO_CONSTEXPR bulk_guarantee_t query(
        const Executor& ex, convertible_from_bulk_guarantee_t,
        typename enable_if<
          !can_query<const Executor&, unsequenced_t>::value
        >::type* = 0,
        typename enable_if<
          !can_query<const Executor&, sequenced_t>::value
        >::type* = 0,
        typename enable_if<
          can_query<const Executor&, parallel_t>::value
        >::type* = 0)
  #if !defined(__clang__) // Clang crashes if noexcept is used here.
  #if defined(BOOST_ASIO_MSVC) // Visual C++ wants the type to be qualified.
      BOOST_ASIO_NOEXCEPT_IF((
        is_nothrow_query<const Executor&, bulk_guarantee_t<>::parallel_t>::value))
  #else // defined(BOOST_ASIO_MSVC)
      BOOST_ASIO_NOEXCEPT_IF((
        is_nothrow_query<const Executor&, parallel_t>::value))
  #endif // defined(BOOST_ASIO_MSVC)
  #endif // !defined(__clang__)
    {
      return boost::asio::query(ex, parallel_t());
    }
  
    BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(unsequenced_t, unsequenced);
    BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(sequenced_t, sequenced);
    BOOST_ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(parallel_t, parallel);
  
  #if !defined(BOOST_ASIO_HAS_CONSTEXPR)
    static const bulk_guarantee_t instance;
  #endif // !defined(BOOST_ASIO_HAS_CONSTEXPR)
  
  private:
    int value_;
  };
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  template <int I> template <typename E, typename T>
  const T bulk_guarantee_t<I>::static_query_v;
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
  #if !defined(BOOST_ASIO_HAS_CONSTEXPR)
  template <int I>
  const bulk_guarantee_t<I> bulk_guarantee_t<I>::instance;
  #endif
  
  template <int I>
  const typename bulk_guarantee_t<I>::unsequenced_t
  bulk_guarantee_t<I>::unsequenced;
  
  template <int I>
  const typename bulk_guarantee_t<I>::sequenced_t
  bulk_guarantee_t<I>::sequenced;
  
  template <int I>
  const typename bulk_guarantee_t<I>::parallel_t
  bulk_guarantee_t<I>::parallel;
  
  namespace bulk_guarantee {
  
  template <int I = 0>
  struct unsequenced_t
  {
  #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
    template <typename T>
    BOOST_ASIO_STATIC_CONSTEXPR(bool,
      is_applicable_property_v = (
        is_executor<T>::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_sender<T>
            >::type::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_scheduler<T>
            >::type::value));
  #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
    typedef bulk_guarantee_t<I> polymorphic_query_result_type;
  
    BOOST_ASIO_CONSTEXPR unsequenced_t()
    {
    }
  
    template <typename T>
    struct query_member :
      traits::query_member<
        typename bulk_guarantee_t<I>::template proxy<T>::type,
          unsequenced_t> {};
  
    template <typename T>
    struct query_static_constexpr_member :
      traits::query_static_constexpr_member<
        typename bulk_guarantee_t<I>::template static_proxy<T>::type,
          unsequenced_t> {};
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename query_static_constexpr_member<T>::result_type
    static_query()
      BOOST_ASIO_NOEXCEPT_IF((
        query_static_constexpr_member<T>::is_noexcept))
    {
      return query_static_constexpr_member<T>::value();
    }
  
    template <typename T>
    static BOOST_ASIO_CONSTEXPR unsequenced_t static_query(
        typename enable_if<
          !query_static_constexpr_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !query_member<T>::is_valid
        >::type* = 0,
        typename enable_if<
          !traits::query_free<T, unsequenced_t>::is_valid
        >::type* = 0,
        typename enable_if<
          !can_query<T, sequenced_t<I> >::value
        >::type* = 0,
        typename enable_if<
          !can_query<T, parallel_t<I> >::value
        >::type* = 0) BOOST_ASIO_NOEXCEPT
    {
      return unsequenced_t();
    }
  
    template <typename E, typename T = decltype(unsequenced_t::static_query<E>())>
    static BOOST_ASIO_CONSTEXPR const T static_query_v
      = unsequenced_t::static_query<E>();
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
    static BOOST_ASIO_CONSTEXPR bulk_guarantee_t<I> value()
    {
      return unsequenced_t();
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const unsequenced_t&, const unsequenced_t&)
    {
      return true;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const unsequenced_t&, const unsequenced_t&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const unsequenced_t&, const sequenced_t<I>&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const unsequenced_t&, const sequenced_t<I>&)
    {
      return true;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const unsequenced_t&, const parallel_t<I>&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const unsequenced_t&, const parallel_t<I>&)
    {
      return true;
    }
  };
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  template <int I> template <typename E, typename T>
  const T unsequenced_t<I>::static_query_v;
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
  template <int I = 0>
  struct sequenced_t
  {
  #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
    template <typename T>
    BOOST_ASIO_STATIC_CONSTEXPR(bool,
      is_applicable_property_v = (
        is_executor<T>::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_sender<T>
            >::type::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_scheduler<T>
            >::type::value));
  #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
    typedef bulk_guarantee_t<I> polymorphic_query_result_type;
  
    BOOST_ASIO_CONSTEXPR sequenced_t()
    {
    }
  
    template <typename T>
    struct query_member :
      traits::query_member<
        typename bulk_guarantee_t<I>::template proxy<T>::type,
          sequenced_t> {};
  
    template <typename T>
    struct query_static_constexpr_member :
      traits::query_static_constexpr_member<
        typename bulk_guarantee_t<I>::template static_proxy<T>::type,
          sequenced_t> {};
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename query_static_constexpr_member<T>::result_type
    static_query()
      BOOST_ASIO_NOEXCEPT_IF((
        query_static_constexpr_member<T>::is_noexcept))
    {
      return query_static_constexpr_member<T>::value();
    }
  
    template <typename E, typename T = decltype(sequenced_t::static_query<E>())>
    static BOOST_ASIO_CONSTEXPR const T static_query_v
      = sequenced_t::static_query<E>();
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
    static BOOST_ASIO_CONSTEXPR bulk_guarantee_t<I> value()
    {
      return sequenced_t();
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const sequenced_t&, const sequenced_t&)
    {
      return true;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const sequenced_t&, const sequenced_t&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const sequenced_t&, const unsequenced_t<I>&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const sequenced_t&, const unsequenced_t<I>&)
    {
      return true;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const sequenced_t&, const parallel_t<I>&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const sequenced_t&, const parallel_t<I>&)
    {
      return true;
    }
  };
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  template <int I> template <typename E, typename T>
  const T sequenced_t<I>::static_query_v;
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
  template <int I>
  struct parallel_t
  {
  #if defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
    template <typename T>
    BOOST_ASIO_STATIC_CONSTEXPR(bool,
      is_applicable_property_v = (
        is_executor<T>::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_sender<T>
            >::type::value
          || conditional<
              is_executor<T>::value,
              false_type,
              is_scheduler<T>
            >::type::value));
  #endif // defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
    typedef bulk_guarantee_t<I> polymorphic_query_result_type;
  
    BOOST_ASIO_CONSTEXPR parallel_t()
    {
    }
  
    template <typename T>
    struct query_member :
      traits::query_member<
        typename bulk_guarantee_t<I>::template proxy<T>::type,
          parallel_t> {};
  
    template <typename T>
    struct query_static_constexpr_member :
      traits::query_static_constexpr_member<
        typename bulk_guarantee_t<I>::template static_proxy<T>::type,
          parallel_t> {};
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
    template <typename T>
    static BOOST_ASIO_CONSTEXPR
    typename query_static_constexpr_member<T>::result_type
    static_query()
      BOOST_ASIO_NOEXCEPT_IF((
        query_static_constexpr_member<T>::is_noexcept))
    {
      return query_static_constexpr_member<T>::value();
    }
  
    template <typename E, typename T = decltype(parallel_t::static_query<E>())>
    static BOOST_ASIO_CONSTEXPR const T static_query_v
      = parallel_t::static_query<E>();
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
    static BOOST_ASIO_CONSTEXPR bulk_guarantee_t<I> value()
    {
      return parallel_t();
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const parallel_t&, const parallel_t&)
    {
      return true;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const parallel_t&, const parallel_t&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const parallel_t&, const unsequenced_t<I>&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const parallel_t&, const unsequenced_t<I>&)
    {
      return true;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator==(
        const parallel_t&, const sequenced_t<I>&)
    {
      return false;
    }
  
    friend BOOST_ASIO_CONSTEXPR bool operator!=(
        const parallel_t&, const sequenced_t<I>&)
    {
      return true;
    }
  };
  
  #if defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  template <int I> template <typename E, typename T>
  const T parallel_t<I>::static_query_v;
  #endif // defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   && defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
  } // namespace bulk_guarantee
  } // namespace detail
  
  typedef detail::bulk_guarantee_t<> bulk_guarantee_t;
  
  #if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
  constexpr bulk_guarantee_t bulk_guarantee;
  #else // defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
  namespace { static const bulk_guarantee_t&
    bulk_guarantee = bulk_guarantee_t::instance; }
  #endif
  
  } // namespace execution
  
  #if !defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  
  template <typename T>
  struct is_applicable_property<T, execution::bulk_guarantee_t>
    : integral_constant<bool,
        execution::is_executor<T>::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_sender<T>
            >::type::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_scheduler<T>
            >::type::value>
  {
  };
  
  template <typename T>
  struct is_applicable_property<T, execution::bulk_guarantee_t::unsequenced_t>
    : integral_constant<bool,
        execution::is_executor<T>::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_sender<T>
            >::type::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_scheduler<T>
            >::type::value>
  {
  };
  
  template <typename T>
  struct is_applicable_property<T, execution::bulk_guarantee_t::sequenced_t>
    : integral_constant<bool,
        execution::is_executor<T>::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_sender<T>
            >::type::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_scheduler<T>
            >::type::value>
  {
  };
  
  template <typename T>
  struct is_applicable_property<T, execution::bulk_guarantee_t::parallel_t>
    : integral_constant<bool,
        execution::is_executor<T>::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_sender<T>
            >::type::value
          || conditional<
              execution::is_executor<T>::value,
              false_type,
              execution::is_scheduler<T>
            >::type::value>
  {
  };
  
  #endif // !defined(BOOST_ASIO_HAS_VARIABLE_TEMPLATES)
  
  namespace traits {
  
  #if !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
  
  template <typename T>
  struct query_free_default<T, execution::bulk_guarantee_t,
    typename enable_if<
      can_query<T, execution::bulk_guarantee_t::unsequenced_t>::value
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
      (is_nothrow_query<T, execution::bulk_guarantee_t::unsequenced_t>::value));
  
    typedef execution::bulk_guarantee_t result_type;
  };
  
  template <typename T>
  struct query_free_default<T, execution::bulk_guarantee_t,
    typename enable_if<
      !can_query<T, execution::bulk_guarantee_t::unsequenced_t>::value
        && can_query<T, execution::bulk_guarantee_t::sequenced_t>::value
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
      (is_nothrow_query<T, execution::bulk_guarantee_t::sequenced_t>::value));
  
    typedef execution::bulk_guarantee_t result_type;
  };
  
  template <typename T>
  struct query_free_default<T, execution::bulk_guarantee_t,
    typename enable_if<
      !can_query<T, execution::bulk_guarantee_t::unsequenced_t>::value
        && !can_query<T, execution::bulk_guarantee_t::sequenced_t>::value
        && can_query<T, execution::bulk_guarantee_t::parallel_t>::value
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
      (is_nothrow_query<T, execution::bulk_guarantee_t::parallel_t>::value));
  
    typedef execution::bulk_guarantee_t result_type;
  };
  
  #endif // !defined(BOOST_ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
  
  #if !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
    || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t,
    typename enable_if<
      execution::detail::bulk_guarantee_t<0>::
        query_static_constexpr_member<T>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename execution::detail::bulk_guarantee_t<0>::
      query_static_constexpr_member<T>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return execution::detail::bulk_guarantee_t<0>::
        query_static_constexpr_member<T>::value();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t,
    typename enable_if<
      !execution::detail::bulk_guarantee_t<0>::
          query_static_constexpr_member<T>::is_valid
        && !execution::detail::bulk_guarantee_t<0>::
          query_member<T>::is_valid
        && traits::static_query<T,
          execution::bulk_guarantee_t::unsequenced_t>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename traits::static_query<T,
      execution::bulk_guarantee_t::unsequenced_t>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return traits::static_query<T,
          execution::bulk_guarantee_t::unsequenced_t>::value();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t,
    typename enable_if<
      !execution::detail::bulk_guarantee_t<0>::
          query_static_constexpr_member<T>::is_valid
        && !execution::detail::bulk_guarantee_t<0>::
          query_member<T>::is_valid
        && !traits::static_query<T,
          execution::bulk_guarantee_t::unsequenced_t>::is_valid
        && traits::static_query<T,
          execution::bulk_guarantee_t::sequenced_t>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename traits::static_query<T,
      execution::bulk_guarantee_t::sequenced_t>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return traits::static_query<T,
          execution::bulk_guarantee_t::sequenced_t>::value();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t,
    typename enable_if<
      !execution::detail::bulk_guarantee_t<0>::
          query_static_constexpr_member<T>::is_valid
        && !execution::detail::bulk_guarantee_t<0>::
          query_member<T>::is_valid
        && !traits::static_query<T,
          execution::bulk_guarantee_t::unsequenced_t>::is_valid
        && !traits::static_query<T,
          execution::bulk_guarantee_t::sequenced_t>::is_valid
        && traits::static_query<T,
          execution::bulk_guarantee_t::parallel_t>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename traits::static_query<T,
      execution::bulk_guarantee_t::parallel_t>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return traits::static_query<T,
          execution::bulk_guarantee_t::parallel_t>::value();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t::unsequenced_t,
    typename enable_if<
      execution::detail::bulk_guarantee::unsequenced_t<0>::
        query_static_constexpr_member<T>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename execution::detail::bulk_guarantee::unsequenced_t<0>::
      query_static_constexpr_member<T>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return execution::detail::bulk_guarantee::unsequenced_t<0>::
        query_static_constexpr_member<T>::value();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t::unsequenced_t,
    typename enable_if<
      !execution::detail::bulk_guarantee::unsequenced_t<0>::
          query_static_constexpr_member<T>::is_valid
        && !execution::detail::bulk_guarantee::unsequenced_t<0>::
          query_member<T>::is_valid
        && !traits::query_free<T,
          execution::bulk_guarantee_t::unsequenced_t>::is_valid
        && !can_query<T, execution::bulk_guarantee_t::sequenced_t>::value
        && !can_query<T, execution::bulk_guarantee_t::parallel_t>::value
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef execution::bulk_guarantee_t::unsequenced_t result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return result_type();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t::sequenced_t,
    typename enable_if<
      execution::detail::bulk_guarantee::sequenced_t<0>::
        query_static_constexpr_member<T>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename execution::detail::bulk_guarantee::sequenced_t<0>::
      query_static_constexpr_member<T>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return execution::detail::bulk_guarantee::sequenced_t<0>::
        query_static_constexpr_member<T>::value();
    }
  };
  
  template <typename T>
  struct static_query<T, execution::bulk_guarantee_t::parallel_t,
    typename enable_if<
      execution::detail::bulk_guarantee::parallel_t<0>::
        query_static_constexpr_member<T>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
  
    typedef typename execution::detail::bulk_guarantee::parallel_t<0>::
      query_static_constexpr_member<T>::result_type result_type;
  
    static BOOST_ASIO_CONSTEXPR result_type value()
    {
      return execution::detail::bulk_guarantee::parallel_t<0>::
        query_static_constexpr_member<T>::value();
    }
  };
  
  #endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
         //   || !defined(BOOST_ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
  
  #if !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT)
  
  template <typename T>
  struct static_require<T, execution::bulk_guarantee_t::unsequenced_t,
    typename enable_if<
      static_query<T, execution::bulk_guarantee_t::unsequenced_t>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid =
      (is_same<typename static_query<T,
        execution::bulk_guarantee_t::unsequenced_t>::result_type,
          execution::bulk_guarantee_t::unsequenced_t>::value));
  };
  
  template <typename T>
  struct static_require<T, execution::bulk_guarantee_t::sequenced_t,
    typename enable_if<
      static_query<T, execution::bulk_guarantee_t::sequenced_t>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid =
      (is_same<typename static_query<T,
        execution::bulk_guarantee_t::sequenced_t>::result_type,
          execution::bulk_guarantee_t::sequenced_t>::value));
  };
  
  template <typename T>
  struct static_require<T, execution::bulk_guarantee_t::parallel_t,
    typename enable_if<
      static_query<T, execution::bulk_guarantee_t::parallel_t>::is_valid
    >::type>
  {
    BOOST_ASIO_STATIC_CONSTEXPR(bool, is_valid =
      (is_same<typename static_query<T,
        execution::bulk_guarantee_t::parallel_t>::result_type,
          execution::bulk_guarantee_t::parallel_t>::value));
  };
  
  #endif // !defined(BOOST_ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT)
  
  } // namespace traits
  
  #endif // defined(GENERATING_DOCUMENTATION)
  
  } // namespace asio
  } // namespace boost
  
  #include <boost/asio/detail/pop_options.hpp>
  
  #endif // BOOST_ASIO_EXECUTION_BULK_GUARANTEE_HPP
  