672 lines
21 KiB
C++
672 lines
21 KiB
C++
//
|
|
// system_executor.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2023 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_SYSTEM_EXECUTOR_HPP
|
|
#define ASIO_SYSTEM_EXECUTOR_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/memory.hpp"
|
|
#include "asio/execution.hpp"
|
|
|
|
#include "asio/detail/push_options.hpp"
|
|
|
|
namespace asio {
|
|
|
|
class system_context;
|
|
|
|
/// An executor that uses arbitrary threads.
|
|
/**
|
|
* The system executor represents an execution context where functions are
|
|
* permitted to run on arbitrary threads. When the blocking.never property is
|
|
* established, the system executor will schedule the function to run on an
|
|
* unspecified system thread pool. When either blocking.possibly or
|
|
* blocking.always is established, the executor invokes the function
|
|
* immediately.
|
|
*/
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
class basic_system_executor
|
|
{
|
|
public:
|
|
/// Default constructor.
|
|
basic_system_executor() ASIO_NOEXCEPT
|
|
: allocator_(Allocator())
|
|
{
|
|
}
|
|
|
|
#if !defined(GENERATING_DOCUMENTATION)
|
|
private:
|
|
friend struct asio_require_fn::impl;
|
|
friend struct asio_prefer_fn::impl;
|
|
#endif // !defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Obtain an executor with the @c blocking.possibly property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::blocking.possibly); @endcode
|
|
*/
|
|
basic_system_executor<execution::blocking_t::possibly_t,
|
|
Relationship, Allocator>
|
|
require(execution::blocking_t::possibly_t) const
|
|
{
|
|
return basic_system_executor<execution::blocking_t::possibly_t,
|
|
Relationship, Allocator>(allocator_);
|
|
}
|
|
|
|
/// Obtain an executor with the @c blocking.always property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::blocking.always); @endcode
|
|
*/
|
|
basic_system_executor<execution::blocking_t::always_t,
|
|
Relationship, Allocator>
|
|
require(execution::blocking_t::always_t) const
|
|
{
|
|
return basic_system_executor<execution::blocking_t::always_t,
|
|
Relationship, Allocator>(allocator_);
|
|
}
|
|
|
|
/// Obtain an executor with the @c blocking.never property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::blocking.never); @endcode
|
|
*/
|
|
basic_system_executor<execution::blocking_t::never_t,
|
|
Relationship, Allocator>
|
|
require(execution::blocking_t::never_t) const
|
|
{
|
|
return basic_system_executor<execution::blocking_t::never_t,
|
|
Relationship, Allocator>(allocator_);
|
|
}
|
|
|
|
/// Obtain an executor with the @c relationship.continuation property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::relationship.continuation); @endcode
|
|
*/
|
|
basic_system_executor<Blocking,
|
|
execution::relationship_t::continuation_t, Allocator>
|
|
require(execution::relationship_t::continuation_t) const
|
|
{
|
|
return basic_system_executor<Blocking,
|
|
execution::relationship_t::continuation_t, Allocator>(allocator_);
|
|
}
|
|
|
|
/// Obtain an executor with the @c relationship.fork property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::relationship.fork); @endcode
|
|
*/
|
|
basic_system_executor<Blocking,
|
|
execution::relationship_t::fork_t, Allocator>
|
|
require(execution::relationship_t::fork_t) const
|
|
{
|
|
return basic_system_executor<Blocking,
|
|
execution::relationship_t::fork_t, Allocator>(allocator_);
|
|
}
|
|
|
|
/// Obtain an executor with the specified @c allocator property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::allocator(my_allocator)); @endcode
|
|
*/
|
|
template <typename OtherAllocator>
|
|
basic_system_executor<Blocking, Relationship, OtherAllocator>
|
|
require(execution::allocator_t<OtherAllocator> a) const
|
|
{
|
|
return basic_system_executor<Blocking,
|
|
Relationship, OtherAllocator>(a.value());
|
|
}
|
|
|
|
/// Obtain an executor with the default @c allocator property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::require customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex1;
|
|
* auto ex2 = asio::require(ex1,
|
|
* asio::execution::allocator); @endcode
|
|
*/
|
|
basic_system_executor<Blocking, Relationship, std::allocator<void> >
|
|
require(execution::allocator_t<void>) const
|
|
{
|
|
return basic_system_executor<Blocking,
|
|
Relationship, std::allocator<void> >();
|
|
}
|
|
|
|
#if !defined(GENERATING_DOCUMENTATION)
|
|
private:
|
|
friend struct asio_query_fn::impl;
|
|
friend struct asio::execution::detail::blocking_t<0>;
|
|
friend struct asio::execution::detail::mapping_t<0>;
|
|
friend struct asio::execution::detail::outstanding_work_t<0>;
|
|
friend struct asio::execution::detail::relationship_t<0>;
|
|
#endif // !defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Query the current value of the @c mapping property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* if (asio::query(ex, asio::execution::mapping)
|
|
* == asio::execution::mapping.thread)
|
|
* ... @endcode
|
|
*/
|
|
static ASIO_CONSTEXPR execution::mapping_t query(
|
|
execution::mapping_t) ASIO_NOEXCEPT
|
|
{
|
|
return execution::mapping.thread;
|
|
}
|
|
|
|
/// Query the current value of the @c context property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* asio::system_context& pool = asio::query(
|
|
* ex, asio::execution::context); @endcode
|
|
*/
|
|
static system_context& query(execution::context_t) ASIO_NOEXCEPT;
|
|
|
|
/// Query the current value of the @c blocking property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* if (asio::query(ex, asio::execution::blocking)
|
|
* == asio::execution::blocking.always)
|
|
* ... @endcode
|
|
*/
|
|
static ASIO_CONSTEXPR execution::blocking_t query(
|
|
execution::blocking_t) ASIO_NOEXCEPT
|
|
{
|
|
return Blocking();
|
|
}
|
|
|
|
/// Query the current value of the @c relationship property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* if (asio::query(ex, asio::execution::relationship)
|
|
* == asio::execution::relationship.continuation)
|
|
* ... @endcode
|
|
*/
|
|
static ASIO_CONSTEXPR execution::relationship_t query(
|
|
execution::relationship_t) ASIO_NOEXCEPT
|
|
{
|
|
return Relationship();
|
|
}
|
|
|
|
/// Query the current value of the @c allocator property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* auto alloc = asio::query(ex,
|
|
* asio::execution::allocator); @endcode
|
|
*/
|
|
template <typename OtherAllocator>
|
|
ASIO_CONSTEXPR Allocator query(
|
|
execution::allocator_t<OtherAllocator>) const ASIO_NOEXCEPT
|
|
{
|
|
return allocator_;
|
|
}
|
|
|
|
/// Query the current value of the @c allocator property.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* auto alloc = asio::query(ex,
|
|
* asio::execution::allocator); @endcode
|
|
*/
|
|
ASIO_CONSTEXPR Allocator query(
|
|
execution::allocator_t<void>) const ASIO_NOEXCEPT
|
|
{
|
|
return allocator_;
|
|
}
|
|
|
|
/// Query the occupancy (recommended number of work items) for the system
|
|
/// context.
|
|
/**
|
|
* Do not call this function directly. It is intended for use with the
|
|
* asio::query customisation point.
|
|
*
|
|
* For example:
|
|
* @code asio::system_executor ex;
|
|
* std::size_t occupancy = asio::query(
|
|
* ex, asio::execution::occupancy); @endcode
|
|
*/
|
|
std::size_t query(execution::occupancy_t) const ASIO_NOEXCEPT;
|
|
|
|
public:
|
|
/// Compare two executors for equality.
|
|
/**
|
|
* Two executors are equal if they refer to the same underlying io_context.
|
|
*/
|
|
friend bool operator==(const basic_system_executor&,
|
|
const basic_system_executor&) ASIO_NOEXCEPT
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/// Compare two executors for inequality.
|
|
/**
|
|
* Two executors are equal if they refer to the same underlying io_context.
|
|
*/
|
|
friend bool operator!=(const basic_system_executor&,
|
|
const basic_system_executor&) ASIO_NOEXCEPT
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/// Execution function.
|
|
template <typename Function>
|
|
void execute(ASIO_MOVE_ARG(Function) f) const
|
|
{
|
|
this->do_execute(ASIO_MOVE_CAST(Function)(f), Blocking());
|
|
}
|
|
|
|
#if !defined(ASIO_NO_TS_EXECUTORS)
|
|
public:
|
|
/// Obtain the underlying execution context.
|
|
system_context& context() const ASIO_NOEXCEPT;
|
|
|
|
/// Inform the executor that it has some outstanding work to do.
|
|
/**
|
|
* For the system executor, this is a no-op.
|
|
*/
|
|
void on_work_started() const ASIO_NOEXCEPT
|
|
{
|
|
}
|
|
|
|
/// Inform the executor that some work is no longer outstanding.
|
|
/**
|
|
* For the system executor, this is a no-op.
|
|
*/
|
|
void on_work_finished() const ASIO_NOEXCEPT
|
|
{
|
|
}
|
|
|
|
/// Request the system executor to invoke the given function object.
|
|
/**
|
|
* This function is used to ask the executor to execute the given function
|
|
* object. The function object will always be executed inside this function.
|
|
*
|
|
* @param f The function object to be called. The executor will make
|
|
* a copy of the handler object as required. The function signature of the
|
|
* function object must be: @code void function(); @endcode
|
|
*
|
|
* @param a An allocator that may be used by the executor to allocate the
|
|
* internal storage needed for function invocation.
|
|
*/
|
|
template <typename Function, typename OtherAllocator>
|
|
void dispatch(ASIO_MOVE_ARG(Function) f, const OtherAllocator& a) const;
|
|
|
|
/// Request the system executor to invoke the given function object.
|
|
/**
|
|
* This function is used to ask the executor to execute the given function
|
|
* object. The function object will never be executed inside this function.
|
|
* Instead, it will be scheduled to run on an unspecified system thread pool.
|
|
*
|
|
* @param f The function object to be called. The executor will make
|
|
* a copy of the handler object as required. The function signature of the
|
|
* function object must be: @code void function(); @endcode
|
|
*
|
|
* @param a An allocator that may be used by the executor to allocate the
|
|
* internal storage needed for function invocation.
|
|
*/
|
|
template <typename Function, typename OtherAllocator>
|
|
void post(ASIO_MOVE_ARG(Function) f, const OtherAllocator& a) const;
|
|
|
|
/// Request the system executor to invoke the given function object.
|
|
/**
|
|
* This function is used to ask the executor to execute the given function
|
|
* object. The function object will never be executed inside this function.
|
|
* Instead, it will be scheduled to run on an unspecified system thread pool.
|
|
*
|
|
* @param f The function object to be called. The executor will make
|
|
* a copy of the handler object as required. The function signature of the
|
|
* function object must be: @code void function(); @endcode
|
|
*
|
|
* @param a An allocator that may be used by the executor to allocate the
|
|
* internal storage needed for function invocation.
|
|
*/
|
|
template <typename Function, typename OtherAllocator>
|
|
void defer(ASIO_MOVE_ARG(Function) f, const OtherAllocator& a) const;
|
|
#endif // !defined(ASIO_NO_TS_EXECUTORS)
|
|
|
|
private:
|
|
template <typename, typename, typename> friend class basic_system_executor;
|
|
|
|
// Constructor used by require().
|
|
basic_system_executor(const Allocator& a)
|
|
: allocator_(a)
|
|
{
|
|
}
|
|
|
|
/// Execution helper implementation for the possibly blocking property.
|
|
template <typename Function>
|
|
void do_execute(ASIO_MOVE_ARG(Function) f,
|
|
execution::blocking_t::possibly_t) const;
|
|
|
|
/// Execution helper implementation for the always blocking property.
|
|
template <typename Function>
|
|
void do_execute(ASIO_MOVE_ARG(Function) f,
|
|
execution::blocking_t::always_t) const;
|
|
|
|
/// Execution helper implementation for the never blocking property.
|
|
template <typename Function>
|
|
void do_execute(ASIO_MOVE_ARG(Function) f,
|
|
execution::blocking_t::never_t) const;
|
|
|
|
// The allocator used for execution functions.
|
|
Allocator allocator_;
|
|
};
|
|
|
|
/// An executor that uses arbitrary threads.
|
|
/**
|
|
* The system executor represents an execution context where functions are
|
|
* permitted to run on arbitrary threads. When the blocking.never property is
|
|
* established, the system executor will schedule the function to run on an
|
|
* unspecified system thread pool. When either blocking.possibly or
|
|
* blocking.always is established, the executor invokes the function
|
|
* immediately.
|
|
*/
|
|
typedef basic_system_executor<execution::blocking_t::possibly_t,
|
|
execution::relationship_t::fork_t, std::allocator<void> >
|
|
system_executor;
|
|
|
|
#if !defined(GENERATING_DOCUMENTATION)
|
|
|
|
namespace traits {
|
|
|
|
#if !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct equality_comparable<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
};
|
|
|
|
#endif // !defined(ASIO_HAS_DEDUCED_EQUALITY_COMPARABLE_TRAIT)
|
|
|
|
#if !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
|
|
|
|
template <typename Blocking, typename Relationship,
|
|
typename Allocator, typename Function>
|
|
struct execute_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
Function
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef void result_type;
|
|
};
|
|
|
|
#endif // !defined(ASIO_HAS_DEDUCED_EXECUTE_MEMBER_TRAIT)
|
|
|
|
#if !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::blocking_t::possibly_t
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<
|
|
asio::execution::blocking_t::possibly_t,
|
|
Relationship, Allocator> result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::blocking_t::always_t
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<
|
|
asio::execution::blocking_t::always_t,
|
|
Relationship, Allocator> result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::blocking_t::never_t
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<
|
|
asio::execution::blocking_t::never_t,
|
|
Relationship, Allocator> result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::relationship_t::fork_t
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<Blocking,
|
|
asio::execution::relationship_t::fork_t,
|
|
Allocator> result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::relationship_t::continuation_t
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<Blocking,
|
|
asio::execution::relationship_t::continuation_t,
|
|
Allocator> result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::allocator_t<void>
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<Blocking,
|
|
Relationship, std::allocator<void> > result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship,
|
|
typename Allocator, typename OtherAllocator>
|
|
struct require_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::allocator_t<OtherAllocator>
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = false);
|
|
typedef asio::basic_system_executor<Blocking,
|
|
Relationship, OtherAllocator> result_type;
|
|
};
|
|
|
|
#endif // !defined(ASIO_HAS_DEDUCED_REQUIRE_MEMBER_TRAIT)
|
|
|
|
#if !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
|
|
|
template <typename Blocking, typename Relationship,
|
|
typename Allocator, typename Property>
|
|
struct query_static_constexpr_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
Property,
|
|
typename asio::enable_if<
|
|
asio::is_convertible<
|
|
Property,
|
|
asio::execution::mapping_t
|
|
>::value
|
|
>::type
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef asio::execution::mapping_t::thread_t result_type;
|
|
|
|
static ASIO_CONSTEXPR result_type value() ASIO_NOEXCEPT
|
|
{
|
|
return result_type();
|
|
}
|
|
};
|
|
|
|
#endif // !defined(ASIO_HAS_DEDUCED_QUERY_STATIC_CONSTEXPR_MEMBER_TRAIT)
|
|
|
|
#if !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
|
|
|
|
template <typename Blocking, typename Relationship,
|
|
typename Allocator, typename Property>
|
|
struct query_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
Property,
|
|
typename asio::enable_if<
|
|
asio::is_convertible<
|
|
Property,
|
|
asio::execution::blocking_t
|
|
>::value
|
|
>::type
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef asio::execution::blocking_t result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship,
|
|
typename Allocator, typename Property>
|
|
struct query_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
Property,
|
|
typename asio::enable_if<
|
|
asio::is_convertible<
|
|
Property,
|
|
asio::execution::relationship_t
|
|
>::value
|
|
>::type
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef asio::execution::relationship_t result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct query_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::context_t
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef asio::system_context& result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct query_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::allocator_t<void>
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef Allocator result_type;
|
|
};
|
|
|
|
template <typename Blocking, typename Relationship, typename Allocator>
|
|
struct query_member<
|
|
asio::basic_system_executor<Blocking, Relationship, Allocator>,
|
|
asio::execution::allocator_t<Allocator>
|
|
>
|
|
{
|
|
ASIO_STATIC_CONSTEXPR(bool, is_valid = true);
|
|
ASIO_STATIC_CONSTEXPR(bool, is_noexcept = true);
|
|
typedef Allocator result_type;
|
|
};
|
|
|
|
#endif // !defined(ASIO_HAS_DEDUCED_QUERY_MEMBER_TRAIT)
|
|
|
|
} // namespace traits
|
|
|
|
#endif // !defined(GENERATING_DOCUMENTATION)
|
|
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#include "asio/impl/system_executor.hpp"
|
|
|
|
#endif // ASIO_SYSTEM_EXECUTOR_HPP
|