basic_socket_acceptor.hpp

//
// basic_socket_acceptor.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_BASIC_SOCKET_ACCEPTOR_HPP
#define ASIO_BASIC_SOCKET_ACCEPTOR_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include "asio/any_io_executor.hpp"
#include "asio/basic_socket.hpp"
#include "asio/detail/handler_type_requirements.hpp"
#include "asio/detail/io_object_impl.hpp"
#include "asio/detail/non_const_lvalue.hpp"
#include "asio/detail/throw_error.hpp"
#include "asio/detail/type_traits.hpp"
#include "asio/error.hpp"
#include "asio/execution_context.hpp"
#include "asio/socket_base.hpp"

#if defined(ASIO_WINDOWS_RUNTIME)
# include "asio/detail/null_socket_service.hpp"
#elif defined(ASIO_HAS_IOCP)
# include "asio/detail/win_iocp_socket_service.hpp"
#else
# include "asio/detail/reactive_socket_service.hpp"
#endif

#if defined(ASIO_HAS_MOVE)
# include <utility>
#endif // defined(ASIO_HAS_MOVE)

#include "asio/detail/push_options.hpp"

namespace asio {

#if !defined(ASIO_BASIC_SOCKET_ACCEPTOR_FWD_DECL)
#define ASIO_BASIC_SOCKET_ACCEPTOR_FWD_DECL

// Forward declaration with defaulted arguments.
template <typename Protocol, typename Executor = any_io_executor>
class basic_socket_acceptor;

#endif // !defined(ASIO_BASIC_SOCKET_ACCEPTOR_FWD_DECL)


template <typename Protocol, typename Executor>
class basic_socket_acceptor
  : public socket_base
{
public:
  typedef Executor executor_type;

  template <typename Executor1>
  struct rebind_executor
  {
    typedef basic_socket_acceptor<Protocol, Executor1> other;
  };

#if defined(GENERATING_DOCUMENTATION)
  typedef implementation_defined native_handle_type;
#elif defined(ASIO_WINDOWS_RUNTIME)
  typedef typename detail::null_socket_service<
    Protocol>::native_handle_type native_handle_type;
#elif defined(ASIO_HAS_IOCP)
  typedef typename detail::win_iocp_socket_service<
    Protocol>::native_handle_type native_handle_type;
#else
  typedef typename detail::reactive_socket_service<
    Protocol>::native_handle_type native_handle_type;
#endif

  typedef Protocol protocol_type;

  typedef typename Protocol::endpoint endpoint_type;


  explicit basic_socket_acceptor(const executor_type& ex)
    : impl_(ex)
  {
  }


  template <typename ExecutionContext>
  explicit basic_socket_acceptor(ExecutionContext& context,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
    : impl_(context)
  {
  }


  basic_socket_acceptor(const executor_type& ex, const protocol_type& protocol)
    : impl_(ex)
  {
    asio::error_code ec;
    impl_.get_service().open(impl_.get_implementation(), protocol, ec);
    asio::detail::throw_error(ec, "open");
  }


  template <typename ExecutionContext>
  basic_socket_acceptor(ExecutionContext& context,
      const protocol_type& protocol,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
    : impl_(context)
  {
    asio::error_code ec;
    impl_.get_service().open(impl_.get_implementation(), protocol, ec);
    asio::detail::throw_error(ec, "open");
  }


  basic_socket_acceptor(const executor_type& ex,
      const endpoint_type& endpoint, bool reuse_addr = true)
    : impl_(ex)
  {
    asio::error_code ec;
    const protocol_type protocol = endpoint.protocol();
    impl_.get_service().open(impl_.get_implementation(), protocol, ec);
    asio::detail::throw_error(ec, "open");
    if (reuse_addr)
    {
      impl_.get_service().set_option(impl_.get_implementation(),
          socket_base::reuse_address(true), ec);
      asio::detail::throw_error(ec, "set_option");
    }
    impl_.get_service().bind(impl_.get_implementation(), endpoint, ec);
    asio::detail::throw_error(ec, "bind");
    impl_.get_service().listen(impl_.get_implementation(),
        socket_base::max_listen_connections, ec);
    asio::detail::throw_error(ec, "listen");
  }


  template <typename ExecutionContext>
  basic_socket_acceptor(ExecutionContext& context,
      const endpoint_type& endpoint, bool reuse_addr = true,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
    : impl_(context)
  {
    asio::error_code ec;
    const protocol_type protocol = endpoint.protocol();
    impl_.get_service().open(impl_.get_implementation(), protocol, ec);
    asio::detail::throw_error(ec, "open");
    if (reuse_addr)
    {
      impl_.get_service().set_option(impl_.get_implementation(),
          socket_base::reuse_address(true), ec);
      asio::detail::throw_error(ec, "set_option");
    }
    impl_.get_service().bind(impl_.get_implementation(), endpoint, ec);
    asio::detail::throw_error(ec, "bind");
    impl_.get_service().listen(impl_.get_implementation(),
        socket_base::max_listen_connections, ec);
    asio::detail::throw_error(ec, "listen");
  }


  basic_socket_acceptor(const executor_type& ex,
      const protocol_type& protocol, const native_handle_type& native_acceptor)
    : impl_(ex)
  {
    asio::error_code ec;
    impl_.get_service().assign(impl_.get_implementation(),
        protocol, native_acceptor, ec);
    asio::detail::throw_error(ec, "assign");
  }


  template <typename ExecutionContext>
  basic_socket_acceptor(ExecutionContext& context,
      const protocol_type& protocol, const native_handle_type& native_acceptor,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
    : impl_(context)
  {
    asio::error_code ec;
    impl_.get_service().assign(impl_.get_implementation(),
        protocol, native_acceptor, ec);
    asio::detail::throw_error(ec, "assign");
  }

#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)

  basic_socket_acceptor(basic_socket_acceptor&& other) ASIO_NOEXCEPT
    : impl_(std::move(other.impl_))
  {
  }


  basic_socket_acceptor& operator=(basic_socket_acceptor&& other)
  {
    impl_ = std::move(other.impl_);
    return *this;
  }

  // All socket acceptors have access to each other's implementations.
  template <typename Protocol1, typename Executor1>
  friend class basic_socket_acceptor;


  template <typename Protocol1, typename Executor1>
  basic_socket_acceptor(basic_socket_acceptor<Protocol1, Executor1>&& other,
      typename enable_if<
        is_convertible<Protocol1, Protocol>::value
          && is_convertible<Executor1, Executor>::value
      >::type* = 0)
    : impl_(std::move(other.impl_))
  {
  }


  template <typename Protocol1, typename Executor1>
  typename enable_if<
    is_convertible<Protocol1, Protocol>::value
      && is_convertible<Executor1, Executor>::value,
    basic_socket_acceptor&
  >::type operator=(basic_socket_acceptor<Protocol1, Executor1>&& other)
  {
    basic_socket_acceptor tmp(std::move(other));
    impl_ = std::move(tmp.impl_);
    return *this;
  }
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)


  ~basic_socket_acceptor()
  {
  }

  executor_type get_executor() ASIO_NOEXCEPT
  {
    return impl_.get_executor();
  }


  void open(const protocol_type& protocol = protocol_type())
  {
    asio::error_code ec;
    impl_.get_service().open(impl_.get_implementation(), protocol, ec);
    asio::detail::throw_error(ec, "open");
  }


  ASIO_SYNC_OP_VOID open(const protocol_type& protocol,
      asio::error_code& ec)
  {
    impl_.get_service().open(impl_.get_implementation(), protocol, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }

  /*
   * This function opens the acceptor to hold an existing native acceptor.
   *
   * @param protocol An object specifying which protocol is to be used.
   *
   * @param native_acceptor A native acceptor.
   *
   * @throws asio::system_error Thrown on failure.
   */
  void assign(const protocol_type& protocol,
      const native_handle_type& native_acceptor)
  {
    asio::error_code ec;
    impl_.get_service().assign(impl_.get_implementation(),
        protocol, native_acceptor, ec);
    asio::detail::throw_error(ec, "assign");
  }

  /*
   * This function opens the acceptor to hold an existing native acceptor.
   *
   * @param protocol An object specifying which protocol is to be used.
   *
   * @param native_acceptor A native acceptor.
   *
   * @param ec Set to indicate what error occurred, if any.
   */
  ASIO_SYNC_OP_VOID assign(const protocol_type& protocol,
      const native_handle_type& native_acceptor, asio::error_code& ec)
  {
    impl_.get_service().assign(impl_.get_implementation(),
        protocol, native_acceptor, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }

  bool is_open() const
  {
    return impl_.get_service().is_open(impl_.get_implementation());
  }


  void bind(const endpoint_type& endpoint)
  {
    asio::error_code ec;
    impl_.get_service().bind(impl_.get_implementation(), endpoint, ec);
    asio::detail::throw_error(ec, "bind");
  }


  ASIO_SYNC_OP_VOID bind(const endpoint_type& endpoint,
      asio::error_code& ec)
  {
    impl_.get_service().bind(impl_.get_implementation(), endpoint, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  void listen(int backlog = socket_base::max_listen_connections)
  {
    asio::error_code ec;
    impl_.get_service().listen(impl_.get_implementation(), backlog, ec);
    asio::detail::throw_error(ec, "listen");
  }


  ASIO_SYNC_OP_VOID listen(int backlog, asio::error_code& ec)
  {
    impl_.get_service().listen(impl_.get_implementation(), backlog, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  void close()
  {
    asio::error_code ec;
    impl_.get_service().close(impl_.get_implementation(), ec);
    asio::detail::throw_error(ec, "close");
  }


  ASIO_SYNC_OP_VOID close(asio::error_code& ec)
  {
    impl_.get_service().close(impl_.get_implementation(), ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
  __declspec(deprecated("This function always fails with "
        "operation_not_supported when used on Windows versions "
        "prior to Windows 8.1."))
#endif
  native_handle_type release()
  {
    asio::error_code ec;
    native_handle_type s = impl_.get_service().release(
        impl_.get_implementation(), ec);
    asio::detail::throw_error(ec, "release");
    return s;
  }


#if defined(ASIO_MSVC) && (ASIO_MSVC >= 1400) \
  && (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0603)
  __declspec(deprecated("This function always fails with "
        "operation_not_supported when used on Windows versions "
        "prior to Windows 8.1."))
#endif
  native_handle_type release(asio::error_code& ec)
  {
    return impl_.get_service().release(impl_.get_implementation(), ec);
  }


  native_handle_type native_handle()
  {
    return impl_.get_service().native_handle(impl_.get_implementation());
  }


  void cancel()
  {
    asio::error_code ec;
    impl_.get_service().cancel(impl_.get_implementation(), ec);
    asio::detail::throw_error(ec, "cancel");
  }


  ASIO_SYNC_OP_VOID cancel(asio::error_code& ec)
  {
    impl_.get_service().cancel(impl_.get_implementation(), ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  template <typename SettableSocketOption>
  void set_option(const SettableSocketOption& option)
  {
    asio::error_code ec;
    impl_.get_service().set_option(impl_.get_implementation(), option, ec);
    asio::detail::throw_error(ec, "set_option");
  }


  template <typename SettableSocketOption>
  ASIO_SYNC_OP_VOID set_option(const SettableSocketOption& option,
      asio::error_code& ec)
  {
    impl_.get_service().set_option(impl_.get_implementation(), option, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  template <typename GettableSocketOption>
  void get_option(GettableSocketOption& option) const
  {
    asio::error_code ec;
    impl_.get_service().get_option(impl_.get_implementation(), option, ec);
    asio::detail::throw_error(ec, "get_option");
  }


  template <typename GettableSocketOption>
  ASIO_SYNC_OP_VOID get_option(GettableSocketOption& option,
      asio::error_code& ec) const
  {
    impl_.get_service().get_option(impl_.get_implementation(), option, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  template <typename IoControlCommand>
  void io_control(IoControlCommand& command)
  {
    asio::error_code ec;
    impl_.get_service().io_control(impl_.get_implementation(), command, ec);
    asio::detail::throw_error(ec, "io_control");
  }


  template <typename IoControlCommand>
  ASIO_SYNC_OP_VOID io_control(IoControlCommand& command,
      asio::error_code& ec)
  {
    impl_.get_service().io_control(impl_.get_implementation(), command, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  bool non_blocking() const
  {
    return impl_.get_service().non_blocking(impl_.get_implementation());
  }


  void non_blocking(bool mode)
  {
    asio::error_code ec;
    impl_.get_service().non_blocking(impl_.get_implementation(), mode, ec);
    asio::detail::throw_error(ec, "non_blocking");
  }


  ASIO_SYNC_OP_VOID non_blocking(
      bool mode, asio::error_code& ec)
  {
    impl_.get_service().non_blocking(impl_.get_implementation(), mode, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  bool native_non_blocking() const
  {
    return impl_.get_service().native_non_blocking(impl_.get_implementation());
  }


  void native_non_blocking(bool mode)
  {
    asio::error_code ec;
    impl_.get_service().native_non_blocking(
        impl_.get_implementation(), mode, ec);
    asio::detail::throw_error(ec, "native_non_blocking");
  }


  ASIO_SYNC_OP_VOID native_non_blocking(
      bool mode, asio::error_code& ec)
  {
    impl_.get_service().native_non_blocking(
        impl_.get_implementation(), mode, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  endpoint_type local_endpoint() const
  {
    asio::error_code ec;
    endpoint_type ep = impl_.get_service().local_endpoint(
        impl_.get_implementation(), ec);
    asio::detail::throw_error(ec, "local_endpoint");
    return ep;
  }


  endpoint_type local_endpoint(asio::error_code& ec) const
  {
    return impl_.get_service().local_endpoint(impl_.get_implementation(), ec);
  }


  void wait(wait_type w)
  {
    asio::error_code ec;
    impl_.get_service().wait(impl_.get_implementation(), w, ec);
    asio::detail::throw_error(ec, "wait");
  }


  ASIO_SYNC_OP_VOID wait(wait_type w, asio::error_code& ec)
  {
    impl_.get_service().wait(impl_.get_implementation(), w, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  template <
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code))
        WaitHandler ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(WaitHandler,
      void (asio::error_code))
  async_wait(wait_type w,
      ASIO_MOVE_ARG(WaitHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
  {
    return async_initiate<WaitHandler, void (asio::error_code)>(
        initiate_async_wait(this), handler, w);
  }

#if !defined(ASIO_NO_EXTENSIONS)

  template <typename Protocol1, typename Executor1>
  void accept(basic_socket<Protocol1, Executor1>& peer,
      typename enable_if<
        is_convertible<Protocol, Protocol1>::value
      >::type* = 0)
  {
    asio::error_code ec;
    impl_.get_service().accept(impl_.get_implementation(),
        peer, static_cast<endpoint_type*>(0), ec);
    asio::detail::throw_error(ec, "accept");
  }


  template <typename Protocol1, typename Executor1>
  ASIO_SYNC_OP_VOID accept(
      basic_socket<Protocol1, Executor1>& peer, asio::error_code& ec,
      typename enable_if<
        is_convertible<Protocol, Protocol1>::value
      >::type* = 0)
  {
    impl_.get_service().accept(impl_.get_implementation(),
        peer, static_cast<endpoint_type*>(0), ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  template <typename Protocol1, typename Executor1,
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code))
        AcceptHandler ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(AcceptHandler,
      void (asio::error_code))
  async_accept(basic_socket<Protocol1, Executor1>& peer,
      ASIO_MOVE_ARG(AcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
      typename enable_if<
        is_convertible<Protocol, Protocol1>::value
      >::type* = 0)
  {
    return async_initiate<AcceptHandler, void (asio::error_code)>(
        initiate_async_accept(this), handler,
        &peer, static_cast<endpoint_type*>(0));
  }


  template <typename Executor1>
  void accept(basic_socket<protocol_type, Executor1>& peer,
      endpoint_type& peer_endpoint)
  {
    asio::error_code ec;
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    asio::detail::throw_error(ec, "accept");
  }


  template <typename Executor1>
  ASIO_SYNC_OP_VOID accept(basic_socket<protocol_type, Executor1>& peer,
      endpoint_type& peer_endpoint, asio::error_code& ec)
  {
    impl_.get_service().accept(
        impl_.get_implementation(), peer, &peer_endpoint, ec);
    ASIO_SYNC_OP_VOID_RETURN(ec);
  }


  template <typename Executor1,
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code))
        AcceptHandler ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(AcceptHandler,
      void (asio::error_code))
  async_accept(basic_socket<protocol_type, Executor1>& peer,
      endpoint_type& peer_endpoint,
      ASIO_MOVE_ARG(AcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
  {
    return async_initiate<AcceptHandler, void (asio::error_code)>(
        initiate_async_accept(this), handler, &peer, &peer_endpoint);
  }
#endif // !defined(ASIO_NO_EXTENSIONS)

#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)

  typename Protocol::socket::template rebind_executor<executor_type>::other
  accept()
  {
    asio::error_code ec;
    typename Protocol::socket::template rebind_executor<
      executor_type>::other peer(impl_.get_executor());
    impl_.get_service().accept(impl_.get_implementation(), peer, 0, ec);
    asio::detail::throw_error(ec, "accept");
    return peer;
  }


  typename Protocol::socket::template rebind_executor<executor_type>::other
  accept(asio::error_code& ec)
  {
    typename Protocol::socket::template rebind_executor<
      executor_type>::other peer(impl_.get_executor());
    impl_.get_service().accept(impl_.get_implementation(), peer, 0, ec);
    return peer;
  }


  template <
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          executor_type>::other)) MoveAcceptHandler
            ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(MoveAcceptHandler,
      void (asio::error_code,
        typename Protocol::socket::template
          rebind_executor<executor_type>::other))
  async_accept(
      ASIO_MOVE_ARG(MoveAcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
  {
    return async_initiate<MoveAcceptHandler,
      void (asio::error_code, typename Protocol::socket::template
        rebind_executor<executor_type>::other)>(
          initiate_async_move_accept(this), handler,
          impl_.get_executor(), static_cast<endpoint_type*>(0),
          static_cast<typename Protocol::socket::template
            rebind_executor<executor_type>::other*>(0));
  }


  template <typename Executor1>
  typename Protocol::socket::template rebind_executor<Executor1>::other
  accept(const Executor1& ex,
      typename enable_if<
        is_executor<Executor1>::value
          || execution::is_executor<Executor1>::value
      >::type* = 0)
  {
    asio::error_code ec;
    typename Protocol::socket::template
      rebind_executor<Executor1>::other peer(ex);
    impl_.get_service().accept(impl_.get_implementation(), peer, 0, ec);
    asio::detail::throw_error(ec, "accept");
    return peer;
  }


  template <typename ExecutionContext>
  typename Protocol::socket::template rebind_executor<
      typename ExecutionContext::executor_type>::other
  accept(ExecutionContext& context,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
  {
    asio::error_code ec;
    typename Protocol::socket::template rebind_executor<
        typename ExecutionContext::executor_type>::other peer(context);
    impl_.get_service().accept(impl_.get_implementation(), peer, 0, ec);
    asio::detail::throw_error(ec, "accept");
    return peer;
  }


  template <typename Executor1>
  typename Protocol::socket::template rebind_executor<Executor1>::other
  accept(const Executor1& ex, asio::error_code& ec,
      typename enable_if<
        is_executor<Executor1>::value
          || execution::is_executor<Executor1>::value
      >::type* = 0)
  {
    typename Protocol::socket::template
      rebind_executor<Executor1>::other peer(ex);
    impl_.get_service().accept(impl_.get_implementation(), peer, 0, ec);
    return peer;
  }


  template <typename ExecutionContext>
  typename Protocol::socket::template rebind_executor<
      typename ExecutionContext::executor_type>::other
  accept(ExecutionContext& context, asio::error_code& ec,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
  {
    typename Protocol::socket::template rebind_executor<
        typename ExecutionContext::executor_type>::other peer(context);
    impl_.get_service().accept(impl_.get_implementation(), peer, 0, ec);
    return peer;
  }


  template <typename Executor1,
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          Executor1>::other)) MoveAcceptHandler
            ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(MoveAcceptHandler,
      void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          Executor1>::other))
  async_accept(const Executor1& ex,
      ASIO_MOVE_ARG(MoveAcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
      typename enable_if<
        is_executor<Executor1>::value
          || execution::is_executor<Executor1>::value
      >::type* = 0)
  {
    typedef typename Protocol::socket::template rebind_executor<
      Executor1>::other other_socket_type;

    return async_initiate<MoveAcceptHandler,
      void (asio::error_code, other_socket_type)>(
        initiate_async_move_accept(this), handler,
        ex, static_cast<endpoint_type*>(0),
        static_cast<other_socket_type*>(0));
  }


  template <typename ExecutionContext,
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          typename ExecutionContext::executor_type>::other)) MoveAcceptHandler
            ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(MoveAcceptHandler,
      void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          typename ExecutionContext::executor_type>::other))
  async_accept(ExecutionContext& context,
      ASIO_MOVE_ARG(MoveAcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
  {
    typedef typename Protocol::socket::template rebind_executor<
      typename ExecutionContext::executor_type>::other other_socket_type;

    return async_initiate<MoveAcceptHandler,
      void (asio::error_code, other_socket_type)>(
        initiate_async_move_accept(this), handler,
        context.get_executor(), static_cast<endpoint_type*>(0),
        static_cast<other_socket_type*>(0));
  }


  typename Protocol::socket::template rebind_executor<executor_type>::other
  accept(endpoint_type& peer_endpoint)
  {
    asio::error_code ec;
    typename Protocol::socket::template rebind_executor<
      executor_type>::other peer(impl_.get_executor());
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    asio::detail::throw_error(ec, "accept");
    return peer;
  }


  typename Protocol::socket::template rebind_executor<executor_type>::other
  accept(endpoint_type& peer_endpoint, asio::error_code& ec)
  {
    typename Protocol::socket::template rebind_executor<
      executor_type>::other peer(impl_.get_executor());
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    return peer;
  }


  template <
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          executor_type>::other)) MoveAcceptHandler
            ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(MoveAcceptHandler,
      void (asio::error_code,
        typename Protocol::socket::template
          rebind_executor<executor_type>::other))
  async_accept(endpoint_type& peer_endpoint,
      ASIO_MOVE_ARG(MoveAcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type))
  {
    return async_initiate<MoveAcceptHandler,
      void (asio::error_code, typename Protocol::socket::template
        rebind_executor<executor_type>::other)>(
          initiate_async_move_accept(this), handler,
          impl_.get_executor(), &peer_endpoint,
          static_cast<typename Protocol::socket::template
            rebind_executor<executor_type>::other*>(0));
  }


  template <typename Executor1>
  typename Protocol::socket::template rebind_executor<Executor1>::other
  accept(const Executor1& ex, endpoint_type& peer_endpoint,
      typename enable_if<
        is_executor<Executor1>::value
          || execution::is_executor<Executor1>::value
      >::type* = 0)
  {
    asio::error_code ec;
    typename Protocol::socket::template
        rebind_executor<Executor1>::other peer(ex);
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    asio::detail::throw_error(ec, "accept");
    return peer;
  }


  template <typename ExecutionContext>
  typename Protocol::socket::template rebind_executor<
      typename ExecutionContext::executor_type>::other
  accept(ExecutionContext& context, endpoint_type& peer_endpoint,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
  {
    asio::error_code ec;
    typename Protocol::socket::template rebind_executor<
        typename ExecutionContext::executor_type>::other peer(context);
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    asio::detail::throw_error(ec, "accept");
    return peer;
  }


  template <typename Executor1>
  typename Protocol::socket::template rebind_executor<Executor1>::other
  accept(const executor_type& ex,
      endpoint_type& peer_endpoint, asio::error_code& ec,
      typename enable_if<
        is_executor<Executor1>::value
          || execution::is_executor<Executor1>::value
      >::type* = 0)
  {
    typename Protocol::socket::template
      rebind_executor<Executor1>::other peer(ex);
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    return peer;
  }


  template <typename ExecutionContext>
  typename Protocol::socket::template rebind_executor<
      typename ExecutionContext::executor_type>::other
  accept(ExecutionContext& context,
      endpoint_type& peer_endpoint, asio::error_code& ec,
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
  {
    typename Protocol::socket::template rebind_executor<
        typename ExecutionContext::executor_type>::other peer(context);
    impl_.get_service().accept(impl_.get_implementation(),
        peer, &peer_endpoint, ec);
    return peer;
  }


  template <typename Executor1,
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          Executor1>::other)) MoveAcceptHandler
            ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(MoveAcceptHandler,
      void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          Executor1>::other))
  async_accept(const Executor1& ex, endpoint_type& peer_endpoint,
      ASIO_MOVE_ARG(MoveAcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
      typename enable_if<
        is_executor<Executor1>::value
          || execution::is_executor<Executor1>::value
      >::type* = 0)
  {
    typedef typename Protocol::socket::template rebind_executor<
      Executor1>::other other_socket_type;

    return async_initiate<MoveAcceptHandler,
      void (asio::error_code, other_socket_type)>(
        initiate_async_move_accept(this), handler,
        ex, &peer_endpoint,
        static_cast<other_socket_type*>(0));
  }


  template <typename ExecutionContext,
      ASIO_COMPLETION_TOKEN_FOR(void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          typename ExecutionContext::executor_type>::other)) MoveAcceptHandler
            ASIO_DEFAULT_COMPLETION_TOKEN_TYPE(executor_type)>
  ASIO_INITFN_AUTO_RESULT_TYPE(MoveAcceptHandler,
      void (asio::error_code,
        typename Protocol::socket::template rebind_executor<
          typename ExecutionContext::executor_type>::other))
  async_accept(ExecutionContext& context,
      endpoint_type& peer_endpoint,
      ASIO_MOVE_ARG(MoveAcceptHandler) handler
        ASIO_DEFAULT_COMPLETION_TOKEN(executor_type),
      typename enable_if<
        is_convertible<ExecutionContext&, execution_context&>::value
      >::type* = 0)
  {
    typedef typename Protocol::socket::template rebind_executor<
      typename ExecutionContext::executor_type>::other other_socket_type;

    return async_initiate<MoveAcceptHandler,
      void (asio::error_code, other_socket_type)>(
        initiate_async_move_accept(this), handler,
        context.get_executor(), &peer_endpoint,
        static_cast<other_socket_type*>(0));
  }
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)

private:
  // Disallow copying and assignment.
  basic_socket_acceptor(const basic_socket_acceptor&) ASIO_DELETED;
  basic_socket_acceptor& operator=(
      const basic_socket_acceptor&) ASIO_DELETED;

  class initiate_async_wait
  {
  public:
    typedef Executor executor_type;

    explicit initiate_async_wait(basic_socket_acceptor* self)
      : self_(self)
    {
    }

    executor_type get_executor() const ASIO_NOEXCEPT
    {
      return self_->get_executor();
    }

    template <typename WaitHandler>
    void operator()(ASIO_MOVE_ARG(WaitHandler) handler, wait_type w) const
    {
      // If you get an error on the following line it means that your handler
      // does not meet the documented type requirements for a WaitHandler.
      ASIO_WAIT_HANDLER_CHECK(WaitHandler, handler) type_check;

      detail::non_const_lvalue<WaitHandler> handler2(handler);
      self_->impl_.get_service().async_wait(
          self_->impl_.get_implementation(), w,
          handler2.value, self_->impl_.get_executor());
    }

  private:
    basic_socket_acceptor* self_;
  };

  class initiate_async_accept
  {
  public:
    typedef Executor executor_type;

    explicit initiate_async_accept(basic_socket_acceptor* self)
      : self_(self)
    {
    }

    executor_type get_executor() const ASIO_NOEXCEPT
    {
      return self_->get_executor();
    }

    template <typename AcceptHandler, typename Protocol1, typename Executor1>
    void operator()(ASIO_MOVE_ARG(AcceptHandler) handler,
        basic_socket<Protocol1, Executor1>* peer,
        endpoint_type* peer_endpoint) const
    {
      // If you get an error on the following line it means that your handler
      // does not meet the documented type requirements for a AcceptHandler.
      ASIO_ACCEPT_HANDLER_CHECK(AcceptHandler, handler) type_check;

      detail::non_const_lvalue<AcceptHandler> handler2(handler);
      self_->impl_.get_service().async_accept(
          self_->impl_.get_implementation(), *peer, peer_endpoint,
          handler2.value, self_->impl_.get_executor());
    }

  private:
    basic_socket_acceptor* self_;
  };

  class initiate_async_move_accept
  {
  public:
    typedef Executor executor_type;

    explicit initiate_async_move_accept(basic_socket_acceptor* self)
      : self_(self)
    {
    }

    executor_type get_executor() const ASIO_NOEXCEPT
    {
      return self_->get_executor();
    }

    template <typename MoveAcceptHandler, typename Executor1, typename Socket>
    void operator()(ASIO_MOVE_ARG(MoveAcceptHandler) handler,
        const Executor1& peer_ex, endpoint_type* peer_endpoint, Socket*) const
    {
      // If you get an error on the following line it means that your handler
      // does not meet the documented type requirements for a MoveAcceptHandler.
      ASIO_MOVE_ACCEPT_HANDLER_CHECK(
          MoveAcceptHandler, handler, Socket) type_check;

      detail::non_const_lvalue<MoveAcceptHandler> handler2(handler);
      self_->impl_.get_service().async_move_accept(
          self_->impl_.get_implementation(), peer_ex, peer_endpoint,
          handler2.value, self_->impl_.get_executor());
    }

  private:
    basic_socket_acceptor* self_;
  };

#if defined(ASIO_WINDOWS_RUNTIME)
  detail::io_object_impl<
    detail::null_socket_service<Protocol>, Executor> impl_;
#elif defined(ASIO_HAS_IOCP)
  detail::io_object_impl<
    detail::win_iocp_socket_service<Protocol>, Executor> impl_;
#else
  detail::io_object_impl<
    detail::reactive_socket_service<Protocol>, Executor> impl_;
#endif
};

} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_BASIC_SOCKET_ACCEPTOR_HPP