FM / asio

/usr/include/boost/asio

Name	Size	Mode	Actions
detail/	-	0755	rm
execution/	-	0755	rm
generic/	-	0755	rm
impl/	-	0755	rm
ip/	-	0755	rm
local/	-	0755	rm
posix/	-	0755	rm
ssl/	-	0755	rm
traits/	-	0755	rm
ts/	-	0755	rm
windows/	-	0755	rm
any_io_executor.hpp	2625	0644	edit dl rm
associated_allocator.hpp	3791	0644	edit dl rm
associated_executor.hpp	5057	0644	edit dl rm
async_result.hpp	19423	0644	edit dl rm
awaitable.hpp	3270	0644	edit dl rm
basic_datagram_socket.hpp	47521	0644	edit dl rm
basic_deadline_timer.hpp	24158	0644	edit dl rm
basic_io_object.hpp	8096	0644	edit dl rm
basic_raw_socket.hpp	46996	0644	edit dl rm
basic_seq_packet_socket.hpp	29184	0644	edit dl rm
basic_serial_port.hpp	31912	0644	edit dl rm
basic_signal_set.hpp	19876	0644	edit dl rm
basic_socket.hpp	65516	0644	edit dl rm
basic_socket_acceptor.hpp	88062	0644	edit dl rm
basic_socket_iostream.hpp	13298	0644	edit dl rm
basic_socket_streambuf.hpp	21713	0644	edit dl rm
basic_streambuf.hpp	13714	0644	edit dl rm
basic_streambuf_fwd.hpp	920	0644	edit dl rm
basic_stream_socket.hpp	41520	0644	edit dl rm
basic_waitable_timer.hpp	28528	0644	edit dl rm
bind_executor.hpp	16510	0644	edit dl rm
buffer.hpp	83254	0644	edit dl rm
buffered_read_stream.hpp	8424	0644	edit dl rm
buffered_read_stream_fwd.hpp	699	0644	edit dl rm
buffered_stream.hpp	9074	0644	edit dl rm
buffered_stream_fwd.hpp	669	0644	edit dl rm
buffered_write_stream.hpp	8042	0644	edit dl rm
buffered_write_stream_fwd.hpp	705	0644	edit dl rm
buffers_iterator.hpp	14049	0644	edit dl rm
completion_condition.hpp	5500	0644	edit dl rm
compose.hpp	4596	0644	edit dl rm
connect.hpp	43157	0644	edit dl rm
coroutine.hpp	9897	0644	edit dl rm
co_spawn.hpp	14509	0644	edit dl rm
deadline_timer.hpp	1138	0644	edit dl rm
defer.hpp	5070	0644	edit dl rm
detached.hpp	3517	0644	edit dl rm
dispatch.hpp	4537	0644	edit dl rm
error.hpp	10351	0644	edit dl rm
execution.hpp	1871	0644	edit dl rm
execution_context.hpp	14341	0644	edit dl rm
executor.hpp	10467	0644	edit dl rm
executor_work_guard.hpp	8039	0644	edit dl rm
handler_alloc_hook.hpp	3471	0644	edit dl rm
handler_continuation_hook.hpp	1474	0644	edit dl rm
handler_invoke_hook.hpp	3744	0644	edit dl rm
high_resolution_timer.hpp	1394	0644	edit dl rm
io_context.hpp	55226	0644	edit dl rm
io_context_strand.hpp	13706	0644	edit dl rm
io_service.hpp	861	0644	edit dl rm
io_service_strand.hpp	575	0644	edit dl rm
is_applicable_property.hpp	1605	0644	edit dl rm
is_executor.hpp	1306	0644	edit dl rm
is_read_buffered.hpp	1646	0644	edit dl rm
is_write_buffered.hpp	1667	0644	edit dl rm
multiple_exceptions.hpp	1631	0644	edit dl rm
packaged_task.hpp	3358	0644	edit dl rm
placeholders.hpp	4146	0644	edit dl rm
post.hpp	4760	0644	edit dl rm
prefer.hpp	18821	0644	edit dl rm
query.hpp	8323	0644	edit dl rm
read.hpp	53894	0644	edit dl rm
read_at.hpp	27766	0644	edit dl rm
read_until.hpp	119477	0644	edit dl rm
redirect_error.hpp	1938	0644	edit dl rm
require.hpp	14926	0644	edit dl rm
require_concept.hpp	9218	0644	edit dl rm
serial_port.hpp	1010	0644	edit dl rm
serial_port_base.hpp	4975	0644	edit dl rm
signal_set.hpp	748	0644	edit dl rm
socket_base.hpp	15939	0644	edit dl rm
spawn.hpp	11793	0644	edit dl rm
ssl.hpp	848	0644	edit dl rm
static_thread_pool.hpp	826	0644	edit dl rm
steady_timer.hpp	1306	0644	edit dl rm
strand.hpp	17193	0644	edit dl rm
streambuf.hpp	826	0644	edit dl rm
system_context.hpp	2649	0644	edit dl rm
system_executor.hpp	22529	0644	edit dl rm
system_timer.hpp	1306	0644	edit dl rm
this_coro.hpp	1149	0644	edit dl rm
thread_pool.hpp	37567	0644	edit dl rm
time_traits.hpp	2281	0644	edit dl rm
unyield.hpp	381	0644	edit dl rm
uses_executor.hpp	2348	0644	edit dl rm
use_awaitable.hpp	5821	0644	edit dl rm
use_future.hpp	4820	0644	edit dl rm
version.hpp	686	0644	edit dl rm
wait_traits.hpp	1451	0644	edit dl rm
write.hpp	52959	0644	edit dl rm
write_at.hpp	29514	0644	edit dl rm
yield.hpp	482	0644	edit dl rm

Edit: /usr/include/boost/asio/async_result.hpp (19423B)

//
// async_result.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 BOOST_ASIO_ASYNC_RESULT_HPP
#define BOOST_ASIO_ASYNC_RESULT_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/detail/variadic_templates.hpp>

#include <boost/asio/detail/push_options.hpp>

namespace boost {
namespace asio {

#if defined(BOOST_ASIO_HAS_CONCEPTS) \
  && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES) \
  && defined(BOOST_ASIO_HAS_DECLTYPE)

namespace detail {

template <typename T>
struct is_completion_signature : false_type
{
};

template <typename R, typename... Args>
struct is_completion_signature<R(Args...)> : true_type
{
};

template <typename T, typename... Args>
BOOST_ASIO_CONCEPT callable_with = requires(T t, Args&&... args)
{
  t(static_cast<Args&&>(args)...);
};

template <typename T, typename Signature>
struct is_completion_handler_for : false_type
{
};

template <typename T, typename R, typename... Args>
struct is_completion_handler_for<T, R(Args...)>
  : integral_constant<bool, (callable_with<T, Args...>)>
{
};

} // namespace detail

template <typename T>
BOOST_ASIO_CONCEPT completion_signature =
  detail::is_completion_signature<T>::value;

#define BOOST_ASIO_COMPLETION_SIGNATURE \
  ::boost::asio::completion_signature

template <typename T, typename Signature>
BOOST_ASIO_CONCEPT completion_handler_for =
  detail::is_completion_signature<Signature>::value
    && detail::is_completion_handler_for<T, Signature>::value;

#define BOOST_ASIO_COMPLETION_HANDLER_FOR(s) \
  ::boost::asio::completion_handler_for<s>

#else // defined(BOOST_ASIO_HAS_CONCEPTS)
      //   && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
      //   && defined(BOOST_ASIO_HAS_DECLTYPE)

#define BOOST_ASIO_COMPLETION_SIGNATURE typename
#define BOOST_ASIO_COMPLETION_HANDLER_FOR(s) typename

#endif // defined(BOOST_ASIO_HAS_CONCEPTS)
       //   && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
       //   && defined(BOOST_ASIO_HAS_DECLTYPE)

/// An interface for customising the behaviour of an initiating function.
/**
 * The async_result traits class is used for determining:
 *
 * @li the concrete completion handler type to be called at the end of the
 * asynchronous operation;
 *
 * @li the initiating function return type; and
 *
 * @li how the return value of the initiating function is obtained.
 *
 * The trait allows the handler and return types to be determined at the point
 * where the specific completion handler signature is known.
 *
 * This template may be specialised for user-defined completion token types.
 * The primary template assumes that the CompletionToken is the completion
 * handler.
 */
template <typename CompletionToken, BOOST_ASIO_COMPLETION_SIGNATURE Signature>
class async_result
{
public:
  /// The concrete completion handler type for the specific signature.
  typedef CompletionToken completion_handler_type;

/// The return type of the initiating function.
  typedef void return_type;

/// Construct an async result from a given handler.
  /**
   * When using a specalised async_result, the constructor has an opportunity
   * to initialise some state associated with the completion handler, which is
   * then returned from the initiating function.
   */
  explicit async_result(completion_handler_type& h)
  {
    (void)h;
  }

/// Obtain the value to be returned from the initiating function.
  return_type get()
  {
  }

#if defined(GENERATING_DOCUMENTATION)

/// Initiate the asynchronous operation that will produce the result, and
  /// obtain the value to be returned from the initiating function.
  template <typename Initiation, typename RawCompletionToken, typename... Args>
  static return_type initiate(
      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token,
      BOOST_ASIO_MOVE_ARG(Args)... args);

#elif defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

template <typename Initiation,
      BOOST_ASIO_COMPLETION_HANDLER_FOR(Signature) RawCompletionToken,
      typename... Args>
  static return_type initiate(
      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token,
      BOOST_ASIO_MOVE_ARG(Args)... args)
  {
    BOOST_ASIO_MOVE_CAST(Initiation)(initiation)(
        BOOST_ASIO_MOVE_CAST(RawCompletionToken)(token),
        BOOST_ASIO_MOVE_CAST(Args)(args)...);
  }

#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

template <typename Initiation,
      BOOST_ASIO_COMPLETION_HANDLER_FOR(Signature) RawCompletionToken>
  static return_type initiate(
      BOOST_ASIO_MOVE_ARG(Initiation) initiation,
      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token)
  {
    BOOST_ASIO_MOVE_CAST(Initiation)(initiation)(
        BOOST_ASIO_MOVE_CAST(RawCompletionToken)(token));
  }

#define BOOST_ASIO_PRIVATE_INITIATE_DEF(n) \
  template <typename Initiation, \
      BOOST_ASIO_COMPLETION_HANDLER_FOR(Signature) RawCompletionToken, \
      BOOST_ASIO_VARIADIC_TPARAMS(n)> \
  static return_type initiate( \
      BOOST_ASIO_MOVE_ARG(Initiation) initiation, \
      BOOST_ASIO_MOVE_ARG(RawCompletionToken) token, \
      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
  { \
    BOOST_ASIO_MOVE_CAST(Initiation)(initiation)( \
        BOOST_ASIO_MOVE_CAST(RawCompletionToken)(token), \
        BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
  } \
  /**/
  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INITIATE_DEF)
#undef BOOST_ASIO_PRIVATE_INITIATE_DEF

#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

private:
  async_result(const async_result&) BOOST_ASIO_DELETED;
  async_result& operator=(const async_result&) BOOST_ASIO_DELETED;
};

#if !defined(GENERATING_DOCUMENTATION)

template <BOOST_ASIO_COMPLETION_SIGNATURE Signature>
class async_result<void, Signature>
{
  // Empty.
};

#endif // !defined(GENERATING_DOCUMENTATION)

/// Helper template to deduce the handler type from a CompletionToken, capture
/// a local copy of the handler, and then create an async_result for the
/// handler.
template <typename CompletionToken, BOOST_ASIO_COMPLETION_SIGNATURE Signature>
struct async_completion
{
  /// The real handler type to be used for the asynchronous operation.
  typedef typename boost::asio::async_result<
    typename decay<CompletionToken>::type,
      Signature>::completion_handler_type completion_handler_type;

#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
  /// Constructor.
  /**
   * The constructor creates the concrete completion handler and makes the link
   * between the handler and the asynchronous result.
   */
  explicit async_completion(CompletionToken& token)
    : completion_handler(static_cast<typename conditional<
        is_same<CompletionToken, completion_handler_type>::value,
        completion_handler_type&, CompletionToken&&>::type>(token)),
      result(completion_handler)
  {
  }
#else // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
  explicit async_completion(typename decay<CompletionToken>::type& token)
    : completion_handler(token),
      result(completion_handler)
  {
  }

explicit async_completion(const typename decay<CompletionToken>::type& token)
    : completion_handler(token),
      result(completion_handler)
  {
  }
#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)

/// A copy of, or reference to, a real handler object.
#if defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
  typename conditional<
    is_same<CompletionToken, completion_handler_type>::value,
    completion_handler_type&, completion_handler_type>::type completion_handler;
#else // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
  completion_handler_type completion_handler;
#endif // defined(BOOST_ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)

/// The result of the asynchronous operation's initiating function.
  async_result<typename decay<CompletionToken>::type, Signature> result;
};

namespace detail {

template <typename CompletionToken, typename Signature>
struct async_result_helper
  : async_result<typename decay<CompletionToken>::type, Signature>
{
};

struct async_result_memfns_base
{
  void initiate();
};

template <typename T>
struct async_result_memfns_derived
  : T, async_result_memfns_base
{
};

template <typename T, T>
struct async_result_memfns_check
{
};

template <typename>
char (&async_result_initiate_memfn_helper(...))[2];

template <typename T>
char async_result_initiate_memfn_helper(
    async_result_memfns_check<
      void (async_result_memfns_base::*)(),
      &async_result_memfns_derived<T>::initiate>*);

template <typename CompletionToken, typename Signature>
struct async_result_has_initiate_memfn
  : integral_constant<bool, sizeof(async_result_initiate_memfn_helper<
      async_result<typename decay<CompletionToken>::type, Signature>
    >(0)) != 1>
{
};

} // namespace detail

#if defined(GENERATING_DOCUMENTATION)
# define BOOST_ASIO_INITFN_RESULT_TYPE(ct, sig) \
  void_or_deduced
#elif defined(_MSC_VER) && (_MSC_VER < 1500)
# define BOOST_ASIO_INITFN_RESULT_TYPE(ct, sig) \
  typename ::boost::asio::detail::async_result_helper< \
    ct, sig>::return_type
#define BOOST_ASIO_HANDLER_TYPE(ct, sig) \
  typename ::boost::asio::detail::async_result_helper< \
    ct, sig>::completion_handler_type
#else
# define BOOST_ASIO_INITFN_RESULT_TYPE(ct, sig) \
  typename ::boost::asio::async_result< \
    typename ::boost::asio::decay<ct>::type, sig>::return_type
#define BOOST_ASIO_HANDLER_TYPE(ct, sig) \
  typename ::boost::asio::async_result< \
    typename ::boost::asio::decay<ct>::type, sig>::completion_handler_type
#endif

#if defined(GENERATION_DOCUMENTATION)
# define BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ct, sig) \
  auto
#elif defined(BOOST_ASIO_HAS_RETURN_TYPE_DEDUCTION)
# define BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ct, sig) \
  auto
#else
# define BOOST_ASIO_INITFN_AUTO_RESULT_TYPE(ct, sig) \
  BOOST_ASIO_INITFN_RESULT_TYPE(ct, sig)
#endif

#if defined(GENERATION_DOCUMENTATION)
# define BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(ct, sig, expr) \
  void_or_deduced
#elif defined(BOOST_ASIO_HAS_DECLTYPE)
# define BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(ct, sig, expr) \
  decltype expr
#else
# define BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(ct, sig, expr) \
  BOOST_ASIO_INITFN_RESULT_TYPE(ct, sig)
#endif

#if defined(GENERATING_DOCUMENTATION)

template <typename CompletionToken,
    completion_signature Signature,
    typename Initiation, typename... Args>
void_or_deduced async_initiate(
    BOOST_ASIO_MOVE_ARG(Initiation) initiation,
    BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken),
    BOOST_ASIO_MOVE_ARG(Args)... args);

#elif defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

template <typename CompletionToken,
    BOOST_ASIO_COMPLETION_SIGNATURE Signature,
    typename Initiation, typename... Args>
inline typename enable_if<
    detail::async_result_has_initiate_memfn<CompletionToken, Signature>::value,
    BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(CompletionToken, Signature,
      (async_result<typename decay<CompletionToken>::type,
        Signature>::initiate(declval<BOOST_ASIO_MOVE_ARG(Initiation)>(),
          declval<BOOST_ASIO_MOVE_ARG(CompletionToken)>(),
          declval<BOOST_ASIO_MOVE_ARG(Args)>()...)))>::type
async_initiate(BOOST_ASIO_MOVE_ARG(Initiation) initiation,
    BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token,
    BOOST_ASIO_MOVE_ARG(Args)... args)
{
  return async_result<typename decay<CompletionToken>::type,
    Signature>::initiate(BOOST_ASIO_MOVE_CAST(Initiation)(initiation),
      BOOST_ASIO_MOVE_CAST(CompletionToken)(token),
      BOOST_ASIO_MOVE_CAST(Args)(args)...);
}

template <typename CompletionToken,
    BOOST_ASIO_COMPLETION_SIGNATURE Signature,
    typename Initiation, typename... Args>
inline typename enable_if<
    !detail::async_result_has_initiate_memfn<CompletionToken, Signature>::value,
    BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken, Signature)>::type
async_initiate(BOOST_ASIO_MOVE_ARG(Initiation) initiation,
    BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token,
    BOOST_ASIO_MOVE_ARG(Args)... args)
{
  async_completion<CompletionToken, Signature> completion(token);

BOOST_ASIO_MOVE_CAST(Initiation)(initiation)(
      BOOST_ASIO_MOVE_CAST(BOOST_ASIO_HANDLER_TYPE(CompletionToken,
        Signature))(completion.completion_handler),
      BOOST_ASIO_MOVE_CAST(Args)(args)...);

return completion.result.get();
}

#else // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

template <typename CompletionToken,
    BOOST_ASIO_COMPLETION_SIGNATURE Signature,
    typename Initiation>
inline typename enable_if<
    detail::async_result_has_initiate_memfn<CompletionToken, Signature>::value,
    BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(CompletionToken, Signature,
      (async_result<typename decay<CompletionToken>::type,
        Signature>::initiate(declval<BOOST_ASIO_MOVE_ARG(Initiation)>(),
          declval<BOOST_ASIO_MOVE_ARG(CompletionToken)>())))>::type
async_initiate(BOOST_ASIO_MOVE_ARG(Initiation) initiation,
    BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token)
{
  return async_result<typename decay<CompletionToken>::type,
    Signature>::initiate(BOOST_ASIO_MOVE_CAST(Initiation)(initiation),
      BOOST_ASIO_MOVE_CAST(CompletionToken)(token));
}

template <typename CompletionToken,
    BOOST_ASIO_COMPLETION_SIGNATURE Signature,
    typename Initiation>
inline typename enable_if<
    !detail::async_result_has_initiate_memfn<CompletionToken, Signature>::value,
    BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken, Signature)>::type
async_initiate(BOOST_ASIO_MOVE_ARG(Initiation) initiation,
    BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token)
{
  async_completion<CompletionToken, Signature> completion(token);

BOOST_ASIO_MOVE_CAST(Initiation)(initiation)(
      BOOST_ASIO_MOVE_CAST(BOOST_ASIO_HANDLER_TYPE(CompletionToken,
        Signature))(completion.completion_handler));

return completion.result.get();
}

#define BOOST_ASIO_PRIVATE_INITIATE_DEF(n) \
  template <typename CompletionToken, \
      BOOST_ASIO_COMPLETION_SIGNATURE Signature, \
      typename Initiation, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
  inline typename enable_if< \
      detail::async_result_has_initiate_memfn< \
        CompletionToken, Signature>::value, \
      BOOST_ASIO_INITFN_DEDUCED_RESULT_TYPE(CompletionToken, Signature, \
        (async_result<typename decay<CompletionToken>::type, \
          Signature>::initiate(declval<BOOST_ASIO_MOVE_ARG(Initiation)>(), \
            declval<BOOST_ASIO_MOVE_ARG(CompletionToken)>(), \
            BOOST_ASIO_VARIADIC_MOVE_DECLVAL(n))))>::type \
  async_initiate(BOOST_ASIO_MOVE_ARG(Initiation) initiation, \
      BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token, \
      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
  { \
    return async_result<typename decay<CompletionToken>::type, \
      Signature>::initiate(BOOST_ASIO_MOVE_CAST(Initiation)(initiation), \
        BOOST_ASIO_MOVE_CAST(CompletionToken)(token), \
        BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
  } \
  \
  template <typename CompletionToken, \
      BOOST_ASIO_COMPLETION_SIGNATURE Signature, \
      typename Initiation, BOOST_ASIO_VARIADIC_TPARAMS(n)> \
  inline typename enable_if< \
      !detail::async_result_has_initiate_memfn< \
        CompletionToken, Signature>::value, \
      BOOST_ASIO_INITFN_RESULT_TYPE(CompletionToken, Signature)>::type \
  async_initiate(BOOST_ASIO_MOVE_ARG(Initiation) initiation, \
      BOOST_ASIO_NONDEDUCED_MOVE_ARG(CompletionToken) token, \
      BOOST_ASIO_VARIADIC_MOVE_PARAMS(n)) \
  { \
    async_completion<CompletionToken, Signature> completion(token); \
  \
    BOOST_ASIO_MOVE_CAST(Initiation)(initiation)( \
        BOOST_ASIO_MOVE_CAST(BOOST_ASIO_HANDLER_TYPE(CompletionToken, \
          Signature))(completion.completion_handler), \
        BOOST_ASIO_VARIADIC_MOVE_ARGS(n)); \
  \
    return completion.result.get(); \
  } \
  /**/
  BOOST_ASIO_VARIADIC_GENERATE(BOOST_ASIO_PRIVATE_INITIATE_DEF)
#undef BOOST_ASIO_PRIVATE_INITIATE_DEF

#endif // defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)

#if defined(BOOST_ASIO_HAS_CONCEPTS) \
  && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES) \
  && defined(BOOST_ASIO_HAS_DECLTYPE)

namespace detail {

template <typename Signature>
struct initiation_archetype
{
  template <completion_handler_for<Signature> CompletionHandler>
  void operator()(CompletionHandler&&) const
  {
  }
};

} // namespace detail

template <typename T, typename Signature>
BOOST_ASIO_CONCEPT completion_token_for =
  detail::is_completion_signature<Signature>::value
  &&
  requires(T&& t)
  {
    async_initiate<T, Signature>(detail::initiation_archetype<Signature>{}, t);
  };

#define BOOST_ASIO_COMPLETION_TOKEN_FOR(s) \
  ::boost::asio::completion_token_for<s>

#else // defined(BOOST_ASIO_HAS_CONCEPTS)
      //   && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
      //   && defined(BOOST_ASIO_HAS_DECLTYPE)

#define BOOST_ASIO_COMPLETION_TOKEN_FOR(s) typename

#endif // defined(BOOST_ASIO_HAS_CONCEPTS)
       //   && defined(BOOST_ASIO_HAS_VARIADIC_TEMPLATES)
       //   && defined(BOOST_ASIO_HAS_DECLTYPE)

namespace detail {

template <typename T, typename = void>
struct default_completion_token_impl
{
  typedef void type;
};

template <typename T>
struct default_completion_token_impl<T,
  typename void_type<typename T::default_completion_token_type>::type>
{
  typedef typename T::default_completion_token_type type;
};

} // namespace detail

#if defined(GENERATING_DOCUMENTATION)

/// Traits type used to determine the default completion token type associated
/// with a type (such as an executor).
/**
 * A program may specialise this traits type if the @c T template parameter in
 * the specialisation is a user-defined type.
 *
 * Specialisations of this trait may provide a nested typedef @c type, which is
 * a default-constructible completion token type.
 */
template <typename T>
struct default_completion_token
{
  /// If @c T has a nested type @c default_completion_token_type,
  /// <tt>T::default_completion_token_type</tt>. Otherwise the typedef @c type
  /// is not defined.
  typedef see_below type;
};
#else
template <typename T>
struct default_completion_token
  : detail::default_completion_token_impl<T>
{
};
#endif

#if defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)

template <typename T>
using default_completion_token_t = typename default_completion_token<T>::type;

#endif // defined(BOOST_ASIO_HAS_ALIAS_TEMPLATES)

#if defined(BOOST_ASIO_HAS_DEFAULT_FUNCTION_TEMPLATE_ARGUMENTS)

#define BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(e) \
  = typename ::boost::asio::default_completion_token<e>::type
#define BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(e) \
  = typename ::boost::asio::default_completion_token<e>::type()

#else // defined(BOOST_ASIO_HAS_DEFAULT_FUNCTION_TEMPLATE_ARGUMENTS)

#define BOOST_ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(e)
#define BOOST_ASIO_DEFAULT_COMPLETION_TOKEN(e)

#endif // defined(BOOST_ASIO_HAS_DEFAULT_FUNCTION_TEMPLATE_ARGUMENTS)

} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#endif // BOOST_ASIO_ASYNC_RESULT_HPP

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