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blocking.hpp
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blocking.hpp
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//
// execution/blocking.hpp
// ~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 ASIO_EXECUTION_BLOCKING_HPP
#define ASIO_EXECUTION_BLOCKING_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/execution/execute.hpp"
#include "asio/execution/executor.hpp"
#include "asio/execution/scheduler.hpp"
#include "asio/execution/sender.hpp"
#include "asio/is_applicable_property.hpp"
#include "asio/prefer.hpp"
#include "asio/query.hpp"
#include "asio/require.hpp"
#include "asio/traits/query_free.hpp"
#include "asio/traits/query_member.hpp"
#include "asio/traits/query_static_constexpr_member.hpp"
#include "asio/traits/static_query.hpp"
#include "asio/traits/static_require.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
#if defined(GENERATING_DOCUMENTATION)
namespace execution {
/// A property to describe what guarantees an executor makes about the blocking
/// behaviour of their execution functions.
struct blocking_t
{
/// The blocking_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 blocking_t property cannot be required.
static constexpr bool is_requirable = false;
/// The top-level blocking_t property cannot be preferred.
static constexpr bool is_preferable = false;
/// The type returned by queries against an @c any_executor.
typedef blocking_t polymorphic_query_result_type;
/// A sub-property that indicates that invocation of an executor's execution
/// function may block pending completion of one or more invocations of the
/// submitted function object.
struct possibly_t
{
/// The blocking_t::possibly_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 blocking_t::possibly_t property can be required.
static constexpr bool is_requirable = true;
/// The blocking_t::possibly_t property can be preferred.
static constexpr bool is_preferable = true;
/// The type returned by queries against an @c any_executor.
typedef blocking_t polymorphic_query_result_type;
/// Default constructor.
constexpr possibly_t();
/// Get the value associated with a property object.
/**
* @returns possibly_t();
*/
static constexpr blocking_t value();
};
/// A sub-property that indicates that invocation of an executor's execution
/// function shall block until completion of all invocations of the submitted
/// function object.
struct always_t
{
/// The blocking_t::always_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 blocking_t::always_t property can be required.
static constexpr bool is_requirable = true;
/// The blocking_t::always_t property can be preferred.
static constexpr bool is_preferable = false;
/// The type returned by queries against an @c any_executor.
typedef blocking_t polymorphic_query_result_type;
/// Default constructor.
constexpr always_t();
/// Get the value associated with a property object.
/**
* @returns always_t();
*/
static constexpr blocking_t value();
};
/// A sub-property that indicates that invocation of an executor's execution
/// function shall not block pending completion of the invocations of the
/// submitted function object.
struct never_t
{
/// The blocking_t::never_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 blocking_t::never_t property can be required.
static constexpr bool is_requirable = true;
/// The blocking_t::never_t property can be preferred.
static constexpr bool is_preferable = true;
/// The type returned by queries against an @c any_executor.
typedef blocking_t polymorphic_query_result_type;
/// Default constructor.
constexpr never_t();
/// Get the value associated with a property object.
/**
* @returns never_t();
*/
static constexpr blocking_t value();
};
/// A special value used for accessing the blocking_t::possibly_t property.
static constexpr possibly_t possibly;
/// A special value used for accessing the blocking_t::always_t property.
static constexpr always_t always;
/// A special value used for accessing the blocking_t::never_t property.
static constexpr never_t never;
/// Default constructor.
constexpr blocking_t();
/// Construct from a sub-property value.
constexpr blocking_t(possibly_t);
/// Construct from a sub-property value.
constexpr blocking_t(always_t);
/// Construct from a sub-property value.
constexpr blocking_t(never_t);
/// Compare property values for equality.
friend constexpr bool operator==(
const blocking_t& a, const blocking_t& b) noexcept;
/// Compare property values for inequality.
friend constexpr bool operator!=(
const blocking_t& a, const blocking_t& b) noexcept;
};
/// A special value used for accessing the blocking_t property.
constexpr blocking_t blocking;
} // namespace execution
#else // defined(GENERATING_DOCUMENTATION)
namespace execution {
namespace detail {
namespace blocking {
template <int I> struct possibly_t;
template <int I> struct always_t;
template <int I> struct never_t;
} // namespace blocking
namespace blocking_adaptation {
template <int I> struct allowed_t;
template <typename Executor, typename Function>
void blocking_execute(
ASIO_MOVE_ARG(Executor) ex,
ASIO_MOVE_ARG(Function) func);
} // namespace blocking_adaptation
template <int I = 0>
struct blocking_t
{
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
template <typename T>
ASIO_STATIC_CONSTEXPR(bool,
is_applicable_property_v = is_executor<T>::value
|| is_sender<T>::value || is_scheduler<T>::value);
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
ASIO_STATIC_CONSTEXPR(bool, is_requirable = false);
ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
typedef blocking_t polymorphic_query_result_type;
typedef detail::blocking::possibly_t<I> possibly_t;
typedef detail::blocking::always_t<I> always_t;
typedef detail::blocking::never_t<I> never_t;
ASIO_CONSTEXPR blocking_t()
: value_(-1)
{
}
ASIO_CONSTEXPR blocking_t(possibly_t)
: value_(0)
{
}
ASIO_CONSTEXPR blocking_t(always_t)
: value_(1)
{
}
ASIO_CONSTEXPR blocking_t(never_t)
: value_(2)
{
}
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename T>
static ASIO_CONSTEXPR
typename traits::query_static_constexpr_member<T, blocking_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, blocking_t>::is_noexcept))
{
return traits::query_static_constexpr_member<T, blocking_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR
typename traits::static_query<T, possibly_t>::result_type
static_query(
typename enable_if<
!traits::query_static_constexpr_member<T, blocking_t>::is_valid
&& !traits::query_member<T, blocking_t>::is_valid
&& traits::static_query<T, possibly_t>::is_valid
>::type* = 0) ASIO_NOEXCEPT
{
return traits::static_query<T, possibly_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR
typename traits::static_query<T, always_t>::result_type
static_query(
typename enable_if<
!traits::query_static_constexpr_member<T, blocking_t>::is_valid
&& !traits::query_member<T, blocking_t>::is_valid
&& !traits::static_query<T, possibly_t>::is_valid
&& traits::static_query<T, always_t>::is_valid
>::type* = 0) ASIO_NOEXCEPT
{
return traits::static_query<T, always_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR
typename traits::static_query<T, never_t>::result_type
static_query(
typename enable_if<
!traits::query_static_constexpr_member<T, blocking_t>::is_valid
&& !traits::query_member<T, blocking_t>::is_valid
&& !traits::static_query<T, possibly_t>::is_valid
&& !traits::static_query<T, always_t>::is_valid
&& traits::static_query<T, never_t>::is_valid
>::type* = 0) ASIO_NOEXCEPT
{
return traits::static_query<T, never_t>::value();
}
template <typename E, typename T = decltype(blocking_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= blocking_t::static_query<E>();
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
friend ASIO_CONSTEXPR bool operator==(
const blocking_t& a, const blocking_t& b)
{
return a.value_ == b.value_;
}
friend ASIO_CONSTEXPR bool operator!=(
const blocking_t& a, const blocking_t& b)
{
return a.value_ != b.value_;
}
struct convertible_from_blocking_t
{
ASIO_CONSTEXPR convertible_from_blocking_t(blocking_t) {}
};
template <typename Executor>
friend ASIO_CONSTEXPR blocking_t query(
const Executor& ex, convertible_from_blocking_t,
typename enable_if<
can_query<const Executor&, possibly_t>::value
>::type* = 0)
#if !defined(__clang__) // Clang crashes if noexcept is used here.
#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, blocking_t<>::possibly_t>::value))
#else // defined(ASIO_MSVC)
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, possibly_t>::value))
#endif // defined(ASIO_MSVC)
#endif // !defined(__clang__)
{
return asio::query(ex, possibly_t());
}
template <typename Executor>
friend ASIO_CONSTEXPR blocking_t query(
const Executor& ex, convertible_from_blocking_t,
typename enable_if<
!can_query<const Executor&, possibly_t>::value
&& can_query<const Executor&, always_t>::value
>::type* = 0)
#if !defined(__clang__) // Clang crashes if noexcept is used here.
#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, blocking_t<>::always_t>::value))
#else // defined(ASIO_MSVC)
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, always_t>::value))
#endif // defined(ASIO_MSVC)
#endif // !defined(__clang__)
{
return asio::query(ex, always_t());
}
template <typename Executor>
friend ASIO_CONSTEXPR blocking_t query(
const Executor& ex, convertible_from_blocking_t,
typename enable_if<
!can_query<const Executor&, possibly_t>::value
&& !can_query<const Executor&, always_t>::value
&& can_query<const Executor&, never_t>::value
>::type* = 0)
#if !defined(__clang__) // Clang crashes if noexcept is used here.
#if defined(ASIO_MSVC) // Visual C++ wants the type to be qualified.
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, blocking_t<>::never_t>::value))
#else // defined(ASIO_MSVC)
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, never_t>::value))
#endif // defined(ASIO_MSVC)
#endif // !defined(__clang__)
{
return asio::query(ex, never_t());
}
ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(possibly_t, possibly);
ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(always_t, always);
ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(never_t, never);
#if !defined(ASIO_HAS_CONSTEXPR)
static const blocking_t instance;
#endif // !defined(ASIO_HAS_CONSTEXPR)
private:
int value_;
};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I> template <typename E, typename T>
const T blocking_t<I>::static_query_v;
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
#if !defined(ASIO_HAS_CONSTEXPR)
template <int I>
const blocking_t<I> blocking_t<I>::instance;
#endif
template <int I>
const typename blocking_t<I>::possibly_t blocking_t<I>::possibly;
template <int I>
const typename blocking_t<I>::always_t blocking_t<I>::always;
template <int I>
const typename blocking_t<I>::never_t blocking_t<I>::never;
namespace blocking {
template <int I = 0>
struct possibly_t
{
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
template <typename T>
ASIO_STATIC_CONSTEXPR(bool,
is_applicable_property_v = is_executor<T>::value
|| is_sender<T>::value || is_scheduler<T>::value);
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
typedef blocking_t<I> polymorphic_query_result_type;
ASIO_CONSTEXPR possibly_t()
{
}
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename T>
static ASIO_CONSTEXPR
typename traits::query_static_constexpr_member<T, possibly_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, possibly_t>::is_noexcept))
{
return traits::query_static_constexpr_member<T, possibly_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR possibly_t static_query(
typename enable_if<
!traits::query_static_constexpr_member<T, possibly_t>::is_valid
&& !traits::query_member<T, possibly_t>::is_valid
&& !traits::query_free<T, possibly_t>::is_valid
&& !can_query<T, always_t<I> >::value
&& !can_query<T, never_t<I> >::value
>::type* = 0) ASIO_NOEXCEPT
{
return possibly_t();
}
template <typename E, typename T = decltype(possibly_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= possibly_t::static_query<E>();
#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
static ASIO_CONSTEXPR blocking_t<I> value()
{
return possibly_t();
}
friend ASIO_CONSTEXPR bool operator==(
const possibly_t&, const possibly_t&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator!=(
const possibly_t&, const possibly_t&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator==(
const possibly_t&, const always_t<I>&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator!=(
const possibly_t&, const always_t<I>&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator==(
const possibly_t&, const never_t<I>&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator!=(
const possibly_t&, const never_t<I>&)
{
return true;
}
};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I> template <typename E, typename T>
const T possibly_t<I>::static_query_v;
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename Executor>
class adapter
{
public:
adapter(int, const Executor& e) ASIO_NOEXCEPT
: executor_(e)
{
}
adapter(const adapter& other) ASIO_NOEXCEPT
: executor_(other.executor_)
{
}
#if defined(ASIO_HAS_MOVE)
adapter(adapter&& other) ASIO_NOEXCEPT
: executor_(ASIO_MOVE_CAST(Executor)(other.executor_))
{
}
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
template <int I>
static ASIO_CONSTEXPR always_t<I> query(
blocking_t<I>) ASIO_NOEXCEPT
{
return always_t<I>();
}
template <int I>
static ASIO_CONSTEXPR always_t<I> query(
possibly_t<I>) ASIO_NOEXCEPT
{
return always_t<I>();
}
template <int I>
static ASIO_CONSTEXPR always_t<I> query(
always_t<I>) ASIO_NOEXCEPT
{
return always_t<I>();
}
template <int I>
static ASIO_CONSTEXPR always_t<I> query(
never_t<I>) ASIO_NOEXCEPT
{
return always_t<I>();
}
template <typename Property>
typename enable_if<
can_query<const Executor&, Property>::value,
typename query_result<const Executor&, Property>::type
>::type query(const Property& p) const
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, Property>::value))
{
return asio::query(executor_, p);
}
template <int I>
typename enable_if<
can_require<const Executor&, possibly_t<I> >::value,
typename require_result<const Executor&, possibly_t<I> >::type
>::type require(possibly_t<I>) const ASIO_NOEXCEPT
{
return asio::require(executor_, possibly_t<I>());
}
template <int I>
typename enable_if<
can_require<const Executor&, never_t<I> >::value,
typename require_result<const Executor&, never_t<I> >::type
>::type require(never_t<I>) const ASIO_NOEXCEPT
{
return asio::require(executor_, never_t<I>());
}
template <typename Property>
typename enable_if<
can_require<const Executor&, Property>::value,
adapter<typename decay<
typename require_result<const Executor&, Property>::type
>::type>
>::type require(const Property& p) const
ASIO_NOEXCEPT_IF((
is_nothrow_require<const Executor&, Property>::value))
{
return adapter<typename decay<
typename require_result<const Executor&, Property>::type
>::type>(0, asio::require(executor_, p));
}
template <typename Property>
typename enable_if<
can_prefer<const Executor&, Property>::value,
adapter<typename decay<
typename prefer_result<const Executor&, Property>::type
>::type>
>::type prefer(const Property& p) const
ASIO_NOEXCEPT_IF((
is_nothrow_prefer<const Executor&, Property>::value))
{
return adapter<typename decay<
typename prefer_result<const Executor&, Property>::type
>::type>(0, asio::prefer(executor_, p));
}
template <typename Function>
typename enable_if<
execution::can_execute<const Executor&, Function>::value
>::type execute(ASIO_MOVE_ARG(Function) f) const
{
blocking_adaptation::blocking_execute(
executor_, ASIO_MOVE_CAST(Function)(f));
}
friend bool operator==(const adapter& a, const adapter& b) ASIO_NOEXCEPT
{
return a.executor_ == b.executor_;
}
friend bool operator!=(const adapter& a, const adapter& b) ASIO_NOEXCEPT
{
return a.executor_ != b.executor_;
}
private:
Executor executor_;
};
template <int I = 0>
struct always_t
{
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
template <typename T>
ASIO_STATIC_CONSTEXPR(bool,
is_applicable_property_v = is_executor<T>::value
|| is_sender<T>::value || is_scheduler<T>::value);
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
ASIO_STATIC_CONSTEXPR(bool, is_preferable = false);
typedef blocking_t<I> polymorphic_query_result_type;
ASIO_CONSTEXPR always_t()
{
}
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename T>
static ASIO_CONSTEXPR
typename traits::query_static_constexpr_member<T, always_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, always_t>::is_noexcept))
{
return traits::query_static_constexpr_member<T, always_t>::value();
}
template <typename E, typename T = decltype(always_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= always_t::static_query<E>();
#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
static ASIO_CONSTEXPR blocking_t<I> value()
{
return always_t();
}
friend ASIO_CONSTEXPR bool operator==(
const always_t&, const always_t&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator!=(
const always_t&, const always_t&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator==(
const always_t&, const possibly_t<I>&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator!=(
const always_t&, const possibly_t<I>&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator==(
const always_t&, const never_t<I>&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator!=(
const always_t&, const never_t<I>&)
{
return true;
}
template <typename Executor>
friend adapter<Executor> require(
const Executor& e, const always_t&,
typename enable_if<
is_executor<Executor>::value
&& traits::static_require<
const Executor&,
blocking_adaptation::allowed_t<0>
>::is_valid
>::type* = 0)
{
return adapter<Executor>(0, e);
}
};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I> template <typename E, typename T>
const T always_t<I>::static_query_v;
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I>
struct never_t
{
#if defined(ASIO_HAS_VARIABLE_TEMPLATES)
template <typename T>
ASIO_STATIC_CONSTEXPR(bool,
is_applicable_property_v = is_executor<T>::value
|| is_sender<T>::value || is_scheduler<T>::value);
#endif // defined(ASIO_HAS_VARIABLE_TEMPLATES)
ASIO_STATIC_CONSTEXPR(bool, is_requirable = true);
ASIO_STATIC_CONSTEXPR(bool, is_preferable = true);
typedef blocking_t<I> polymorphic_query_result_type;
ASIO_CONSTEXPR never_t()
{
}
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename T>
static ASIO_CONSTEXPR
typename traits::query_static_constexpr_member<T, never_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, never_t>::is_noexcept))
{
return traits::query_static_constexpr_member<T, never_t>::value();
}
template <typename E, typename T = decltype(never_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= never_t::static_query<E>();
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
static ASIO_CONSTEXPR blocking_t<I> value()
{
return never_t();
}
friend ASIO_CONSTEXPR bool operator==(
const never_t&, const never_t&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator!=(
const never_t&, const never_t&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator==(
const never_t&, const possibly_t<I>&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator!=(
const never_t&, const possibly_t<I>&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator==(
const never_t&, const always_t<I>&)
{
return false;
}
friend ASIO_CONSTEXPR bool operator!=(
const never_t&, const always_t<I>&)
{
return true;
}
};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I> template <typename E, typename T>
const T never_t<I>::static_query_v;
#endif // defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
} // namespace blocking
} // namespace detail
typedef detail::blocking_t<> blocking_t;
#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
constexpr blocking_t blocking;
#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
namespace { static const blocking_t& blocking = blocking_t::instance; }
#endif
} // namespace execution
#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
template <typename T>
struct is_applicable_property<T, execution::blocking_t>
: integral_constant<bool,
execution::is_executor<T>::value
|| execution::is_sender<T>::value
|| execution::is_scheduler<T>::value>
{
};
template <typename T>
struct is_applicable_property<T, execution::blocking_t::possibly_t>
: integral_constant<bool,
execution::is_executor<T>::value
|| execution::is_sender<T>::value
|| execution::is_scheduler<T>::value>
{
};
template <typename T>
struct is_applicable_property<T, execution::blocking_t::always_t>
: integral_constant<bool,
execution::is_executor<T>::value
|| execution::is_sender<T>::value
|| execution::is_scheduler<T>::value>
{
};
template <typename T>
struct is_applicable_property<T, execution::blocking_t::never_t>
: integral_constant<bool,
execution::is_executor<T>::value
|| execution::is_sender<T>::value
|| execution::is_scheduler<T>::value>
{
};
#endif // !defined(ASIO_HAS_VARIABLE_TEMPLATES)
namespace traits {
#if !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
template <typename T>
struct query_free_default<T, execution::blocking_t,
typename enable_if<
can_query<T, execution::blocking_t::possibly_t>::value
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
(is_nothrow_query<T, execution::blocking_t::possibly_t>::value));
typedef execution::blocking_t result_type;
};
template <typename T>
struct query_free_default<T, execution::blocking_t,
typename enable_if<
!can_query<T, execution::blocking_t::possibly_t>::value
&& can_query<T, execution::blocking_t::always_t>::value
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
(is_nothrow_query<T, execution::blocking_t::always_t>::value));
typedef execution::blocking_t result_type;
};
template <typename T>
struct query_free_default<T, execution::blocking_t,
typename enable_if<
!can_query<T, execution::blocking_t::possibly_t>::value
&& !can_query<T, execution::blocking_t::always_t>::value
&& can_query<T, execution::blocking_t::never_t>::value
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
(is_nothrow_query<T, execution::blocking_t::never_t>::value));
typedef execution::blocking_t result_type;
};
#endif // !defined(ASIO_HAS_DEDUCED_QUERY_FREE_TRAIT)
#if !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
|| !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <typename T>
struct static_query<T, execution::blocking_t,
typename enable_if<
traits::query_static_constexpr_member<T,
execution::blocking_t>::is_valid
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
typedef typename traits::query_static_constexpr_member<T,
execution::blocking_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::query_static_constexpr_member<T,
execution::blocking_t>::value();
}
};
template <typename T>
struct static_query<T, execution::blocking_t,
typename enable_if<
!traits::query_static_constexpr_member<T, execution::blocking_t>::is_valid
&& !traits::query_member<T, execution::blocking_t>::is_valid
&& traits::static_query<T, execution::blocking_t::possibly_t>::is_valid
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
typedef typename traits::static_query<T,
execution::blocking_t::possibly_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::static_query<T, execution::blocking_t::possibly_t>::value();
}
};
template <typename T>
struct static_query<T, execution::blocking_t,
typename enable_if<
!traits::query_static_constexpr_member<T, execution::blocking_t>::is_valid
&& !traits::query_member<T, execution::blocking_t>::is_valid
&& !traits::static_query<T, execution::blocking_t::possibly_t>::is_valid
&& traits::static_query<T, execution::blocking_t::always_t>::is_valid
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
typedef typename traits::static_query<T,
execution::blocking_t::always_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::static_query<T, execution::blocking_t::always_t>::value();
}
};
template <typename T>
struct static_query<T, execution::blocking_t,
typename enable_if<
!traits::query_static_constexpr_member<T, execution::blocking_t>::is_valid
&& !traits::query_member<T, execution::blocking_t>::is_valid
&& !traits::static_query<T, execution::blocking_t::possibly_t>::is_valid
&& !traits::static_query<T, execution::blocking_t::always_t>::is_valid