relationship.hpp
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//
// execution/relationship.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_RELATIONSHIP_HPP
#define ASIO_EXECUTION_RELATIONSHIP_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/executor.hpp"
#include "asio/execution/scheduler.hpp"
#include "asio/execution/sender.hpp"
#include "asio/is_applicable_property.hpp"
#include "asio/query.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 whether submitted tasks represent continuations of
/// the calling context.
struct relationship_t
{
/// The relationship_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 relationship_t property cannot be required.
static constexpr bool is_requirable = false;
/// The top-level relationship_t property cannot be preferred.
static constexpr bool is_preferable = false;
/// The type returned by queries against an @c any_executor.
typedef relationship_t polymorphic_query_result_type;
/// A sub-property that indicates that the executor does not represent a
/// continuation of the calling context.
struct fork_t
{
/// The relationship_t::fork_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 relationship_t::fork_t property can be required.
static constexpr bool is_requirable = true;
/// The relationship_t::fork_t property can be preferred.
static constexpr bool is_preferable = true;
/// The type returned by queries against an @c any_executor.
typedef relationship_t polymorphic_query_result_type;
/// Default constructor.
constexpr fork_t();
/// Get the value associated with a property object.
/**
* @returns fork_t();
*/
static constexpr relationship_t value();
};
/// A sub-property that indicates that the executor represents a continuation
/// of the calling context.
struct continuation_t
{
/// The relationship_t::continuation_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 relationship_t::continuation_t property can be required.
static constexpr bool is_requirable = true;
/// The relationship_t::continuation_t property can be preferred.
static constexpr bool is_preferable = true;
/// The type returned by queries against an @c any_executor.
typedef relationship_t polymorphic_query_result_type;
/// Default constructor.
constexpr continuation_t();
/// Get the value associated with a property object.
/**
* @returns continuation_t();
*/
static constexpr relationship_t value();
};
/// A special value used for accessing the relationship_t::fork_t property.
static constexpr fork_t fork;
/// A special value used for accessing the relationship_t::continuation_t
/// property.
static constexpr continuation_t continuation;
/// Default constructor.
constexpr relationship_t();
/// Construct from a sub-property value.
constexpr relationship_t(fork_t);
/// Construct from a sub-property value.
constexpr relationship_t(continuation_t);
/// Compare property values for equality.
friend constexpr bool operator==(
const relationship_t& a, const relationship_t& b) noexcept;
/// Compare property values for inequality.
friend constexpr bool operator!=(
const relationship_t& a, const relationship_t& b) noexcept;
};
/// A special value used for accessing the relationship_t property.
constexpr relationship_t relationship;
} // namespace execution
#else // defined(GENERATING_DOCUMENTATION)
namespace execution {
namespace detail {
namespace relationship {
template <int I> struct fork_t;
template <int I> struct continuation_t;
} // namespace relationship
template <int I = 0>
struct relationship_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 relationship_t polymorphic_query_result_type;
typedef detail::relationship::fork_t<I> fork_t;
typedef detail::relationship::continuation_t<I> continuation_t;
ASIO_CONSTEXPR relationship_t()
: value_(-1)
{
}
ASIO_CONSTEXPR relationship_t(fork_t)
: value_(0)
{
}
ASIO_CONSTEXPR relationship_t(continuation_t)
: value_(1)
{
}
#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, relationship_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<
T, relationship_t
>::is_noexcept))
{
return traits::query_static_constexpr_member<
T, relationship_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR
typename traits::static_query<T, fork_t>::result_type
static_query(
typename enable_if<
!traits::query_static_constexpr_member<
T, relationship_t>::is_valid
&& !traits::query_member<T, relationship_t>::is_valid
&& traits::static_query<T, fork_t>::is_valid
>::type* = 0) ASIO_NOEXCEPT
{
return traits::static_query<T, fork_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR
typename traits::static_query<T, continuation_t>::result_type
static_query(
typename enable_if<
!traits::query_static_constexpr_member<
T, relationship_t>::is_valid
&& !traits::query_member<T, relationship_t>::is_valid
&& !traits::static_query<T, fork_t>::is_valid
&& traits::static_query<T, continuation_t>::is_valid
>::type* = 0) ASIO_NOEXCEPT
{
return traits::static_query<T, continuation_t>::value();
}
template <typename E,
typename T = decltype(relationship_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= relationship_t::static_query<E>();
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
friend ASIO_CONSTEXPR bool operator==(
const relationship_t& a, const relationship_t& b)
{
return a.value_ == b.value_;
}
friend ASIO_CONSTEXPR bool operator!=(
const relationship_t& a, const relationship_t& b)
{
return a.value_ != b.value_;
}
struct convertible_from_relationship_t
{
ASIO_CONSTEXPR convertible_from_relationship_t(relationship_t)
{
}
};
template <typename Executor>
friend ASIO_CONSTEXPR relationship_t query(
const Executor& ex, convertible_from_relationship_t,
typename enable_if<
can_query<const Executor&, fork_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&, relationship_t<>::fork_t>::value))
#else // defined(ASIO_MSVC)
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, fork_t>::value))
#endif // defined(ASIO_MSVC)
#endif // !defined(__clang__)
{
return asio::query(ex, fork_t());
}
template <typename Executor>
friend ASIO_CONSTEXPR relationship_t query(
const Executor& ex, convertible_from_relationship_t,
typename enable_if<
!can_query<const Executor&, fork_t>::value
&& can_query<const Executor&, continuation_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&,
relationship_t<>::continuation_t>::value))
#else // defined(ASIO_MSVC)
ASIO_NOEXCEPT_IF((
is_nothrow_query<const Executor&, continuation_t>::value))
#endif // defined(ASIO_MSVC)
#endif // !defined(__clang__)
{
return asio::query(ex, continuation_t());
}
ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(fork_t, fork);
ASIO_STATIC_CONSTEXPR_DEFAULT_INIT(continuation_t, continuation);
#if !defined(ASIO_HAS_CONSTEXPR)
static const relationship_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 relationship_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 relationship_t<I> relationship_t<I>::instance;
#endif
template <int I>
const typename relationship_t<I>::fork_t
relationship_t<I>::fork;
template <int I>
const typename relationship_t<I>::continuation_t
relationship_t<I>::continuation;
namespace relationship {
template <int I = 0>
struct fork_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 relationship_t<I> polymorphic_query_result_type;
ASIO_CONSTEXPR fork_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, fork_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, fork_t>::is_noexcept))
{
return traits::query_static_constexpr_member<T, fork_t>::value();
}
template <typename T>
static ASIO_CONSTEXPR fork_t static_query(
typename enable_if<
!traits::query_static_constexpr_member<T, fork_t>::is_valid
&& !traits::query_member<T, fork_t>::is_valid
&& !traits::query_free<T, fork_t>::is_valid
&& !can_query<T, continuation_t<I> >::value
>::type* = 0) ASIO_NOEXCEPT
{
return fork_t();
}
template <typename E, typename T = decltype(fork_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= fork_t::static_query<E>();
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
static ASIO_CONSTEXPR relationship_t<I> value()
{
return fork_t();
}
friend ASIO_CONSTEXPR bool operator==(
const fork_t&, const fork_t&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator!=(
const fork_t&, const fork_t&)
{
return false;
}
};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I> template <typename E, typename T>
const T fork_t<I>::static_query_v;
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I = 0>
struct continuation_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 relationship_t<I> polymorphic_query_result_type;
ASIO_CONSTEXPR continuation_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, continuation_t>::result_type
static_query()
ASIO_NOEXCEPT_IF((
traits::query_static_constexpr_member<T, continuation_t>::is_noexcept))
{
return traits::query_static_constexpr_member<T, continuation_t>::value();
}
template <typename E,
typename T = decltype(continuation_t::static_query<E>())>
static ASIO_CONSTEXPR const T static_query_v
= continuation_t::static_query<E>();
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
static ASIO_CONSTEXPR relationship_t<I> value()
{
return continuation_t();
}
friend ASIO_CONSTEXPR bool operator==(
const continuation_t&, const continuation_t&)
{
return true;
}
friend ASIO_CONSTEXPR bool operator!=(
const continuation_t&, const continuation_t&)
{
return false;
}
};
#if defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT) \
&& defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
template <int I> template <typename E, typename T>
const T continuation_t<I>::static_query_v;
#endif // defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// && defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
} // namespace relationship
} // namespace detail
typedef detail::relationship_t<> relationship_t;
#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
constexpr relationship_t relationship;
#else // defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
namespace { static const relationship_t&
relationship = relationship_t::instance; }
#endif
} // namespace execution
#if !defined(ASIO_HAS_VARIABLE_TEMPLATES)
template <typename T>
struct is_applicable_property<T, execution::relationship_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::relationship_t::fork_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::relationship_t::continuation_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::relationship_t,
typename enable_if<
can_query<T, execution::relationship_t::fork_t>::value
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
(is_nothrow_query<T, execution::relationship_t::fork_t>::value));
typedef execution::relationship_t result_type;
};
template <typename T>
struct query_free_default<T, execution::relationship_t,
typename enable_if<
!can_query<T, execution::relationship_t::fork_t>::value
&& can_query<T, execution::relationship_t::continuation_t>::value
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept =
(is_nothrow_query<T, execution::relationship_t::continuation_t>::value));
typedef execution::relationship_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::relationship_t,
typename enable_if<
traits::query_static_constexpr_member<T,
execution::relationship_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::relationship_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::query_static_constexpr_member<T,
execution::relationship_t>::value();
}
};
template <typename T>
struct static_query<T, execution::relationship_t,
typename enable_if<
!traits::query_static_constexpr_member<T,
execution::relationship_t>::is_valid
&& !traits::query_member<T,
execution::relationship_t>::is_valid
&& traits::static_query<T,
execution::relationship_t::fork_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::relationship_t::fork_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::static_query<T,
execution::relationship_t::fork_t>::value();
}
};
template <typename T>
struct static_query<T, execution::relationship_t,
typename enable_if<
!traits::query_static_constexpr_member<T,
execution::relationship_t>::is_valid
&& !traits::query_member<T,
execution::relationship_t>::is_valid
&& !traits::static_query<T,
execution::relationship_t::fork_t>::is_valid
&& traits::static_query<T,
execution::relationship_t::continuation_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::relationship_t::continuation_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::static_query<T,
execution::relationship_t::continuation_t>::value();
}
};
template <typename T>
struct static_query<T, execution::relationship_t::fork_t,
typename enable_if<
traits::query_static_constexpr_member<T,
execution::relationship_t::fork_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::relationship_t::fork_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::query_static_constexpr_member<T,
execution::relationship_t::fork_t>::value();
}
};
template <typename T>
struct static_query<T, execution::relationship_t::fork_t,
typename enable_if<
!traits::query_static_constexpr_member<T,
execution::relationship_t::fork_t>::is_valid
&& !traits::query_member<T,
execution::relationship_t::fork_t>::is_valid
&& !traits::query_free<T,
execution::relationship_t::fork_t>::is_valid
&& !can_query<T, execution::relationship_t::continuation_t>::value
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
typedef execution::relationship_t::fork_t result_type;
static ASIO_CONSTEXPR result_type value()
{
return result_type();
}
};
template <typename T>
struct static_query<T, execution::relationship_t::continuation_t,
typename enable_if<
traits::query_static_constexpr_member<T,
execution::relationship_t::continuation_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::relationship_t::continuation_t>::result_type result_type;
static ASIO_CONSTEXPR result_type value()
{
return traits::query_static_constexpr_member<T,
execution::relationship_t::continuation_t>::value();
}
};
#endif // !defined(ASIO_HAS_DEDUCED_STATIC_QUERY_TRAIT)
// || !defined(ASIO_HAS_SFINAE_VARIABLE_TEMPLATES)
#if !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT)
template <typename T>
struct static_require<T, execution::relationship_t::fork_t,
typename enable_if<
static_query<T, execution::relationship_t::fork_t>::is_valid
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid =
(is_same<typename static_query<T,
execution::relationship_t::fork_t>::result_type,
execution::relationship_t::fork_t>::value));
};
template <typename T>
struct static_require<T, execution::relationship_t::continuation_t,
typename enable_if<
static_query<T, execution::relationship_t::continuation_t>::is_valid
>::type>
{
ASIO_STATIC_CONSTEXPR(bool, is_valid =
(is_same<typename static_query<T,
execution::relationship_t::continuation_t>::result_type,
execution::relationship_t::continuation_t>::value));
};
#endif // !defined(ASIO_HAS_DEDUCED_STATIC_REQUIRE_TRAIT)
} // namespace traits
#endif // defined(GENERATING_DOCUMENTATION)
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_EXECUTION_RELATIONSHIP_HPP