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                    socket descriptor - int(POSIX) orSOCKET(Windows) | 
                    For TCP: ip::tcp::socket,
                    ip::tcp::acceptor
                   
                    For UDP: ip::udp::socket
                   
                    basic_socket,
                    basic_stream_socket,
                    basic_datagram_socket,
                    basic_raw_socket
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                    in_addr,in6_addr | 
                    ip::address,
                    ip::address_v4,
                    ip::address_v6
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                    sockaddr_in,sockaddr_in6 | 
                    For TCP: ip::tcp::endpoint
                   
                    For UDP: ip::udp::endpoint
                   
                    ip::basic_endpoint
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                    accept() | 
                    For TCP: ip::tcp::acceptor::accept()
                   
                    basic_socket_acceptor::accept()
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                    bind() | 
                    For TCP: ip::tcp::acceptor::bind(),
                    ip::tcp::socket::bind()
                   
                    For UDP: ip::udp::socket::bind()
                   
                    basic_socket::bind()
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                    close() | 
                    For TCP: ip::tcp::acceptor::close(),
                    ip::tcp::socket::close()
                   
                    For UDP: ip::udp::socket::close()
                   
                    basic_socket::close()
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                    connect() | 
                    For TCP: ip::tcp::socket::connect()
                   
                    For UDP: ip::udp::socket::connect()
                   
                    basic_socket::connect()
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                    getaddrinfo(),gethostbyaddr(),gethostbyname(),getnameinfo(),getservbyname(),getservbyport() | 
                    For TCP: ip::tcp::resolver::resolve(),
                    ip::tcp::resolver::async_resolve()
                   
                    For UDP: ip::udp::resolver::resolve(),
                    ip::udp::resolver::async_resolve()
                   
                    ip::basic_resolver::resolve(),
                    ip::basic_resolver::async_resolve()
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                    gethostname() | 
                    ip::host_name()
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                    getpeername() | 
                    For TCP: ip::tcp::socket::remote_endpoint()
                   
                    For UDP: ip::udp::socket::remote_endpoint()
                   
                    basic_socket::remote_endpoint()
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                    getsockname() | 
                    For TCP: ip::tcp::acceptor::local_endpoint(),
                    ip::tcp::socket::local_endpoint()
                   
                    For UDP: ip::udp::socket::local_endpoint()
                   
                    basic_socket::local_endpoint()
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                    getsockopt() | 
                    For TCP: ip::tcp::acceptor::get_option(),
                    ip::tcp::socket::get_option()
                   
                    For UDP: ip::udp::socket::get_option()
                   
                    basic_socket::get_option()
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                    inet_addr(),inet_aton(),inet_pton() | 
                    ip::address::from_string(),
                    ip::address_v4::from_string(),
                    ip_address_v6::from_string()
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                    inet_ntoa(),inet_ntop() | 
                    ip::address::to_string(),
                    ip::address_v4::to_string(),
                    ip_address_v6::to_string()
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                    ioctl() | 
                    For TCP: ip::tcp::socket::io_control()
                   
                    For UDP: ip::udp::socket::io_control()
                   
                    basic_socket::io_control()
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                    listen() | 
                    For TCP: ip::tcp::acceptor::listen()
                   
                    basic_socket_acceptor::listen()
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                    poll(),select(),pselect() | 
                    io_service::run(),
                    io_service::run_one(),
                    io_service::poll(),
                    io_service::poll_one()
                   
                    Note: in conjunction with asynchronous operations.
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                    readv(),recv(),read() | 
                    For TCP: ip::tcp::socket::read_some(),
                    ip::tcp::socket::async_read_some(),
                    ip::tcp::socket::receive(),
                    ip::tcp::socket::async_receive()
                   
                    For UDP: ip::udp::socket::receive(),
                    ip::udp::socket::async_receive()
                   
                    basic_stream_socket::read_some(),
                    basic_stream_socket::async_read_some(),
                    basic_stream_socket::receive(),
                    basic_stream_socket::async_receive(),
                    basic_datagram_socket::receive(),
                    basic_datagram_socket::async_receive()
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                    recvfrom() | 
                    For UDP: ip::udp::socket::receive_from(),
                    ip::udp::socket::async_receive_from()
                   
                    basic_datagram_socket::receive_from(),
                    basic_datagram_socket::async_receive_from()
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                    send(),write(),writev() | 
                    For TCP: ip::tcp::socket::write_some(),
                    ip::tcp::socket::async_write_some(),
                    ip::tcp::socket::send(),
                    ip::tcp::socket::async_send()
                   
                    For UDP: ip::udp::socket::send(),
                    ip::udp::socket::async_send()
                   
                    basic_stream_socket::write_some(),
                    basic_stream_socket::async_write_some(),
                    basic_stream_socket::send(),
                    basic_stream_socket::async_send(),
                    basic_datagram_socket::send(),
                    basic_datagram_socket::async_send()
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                    sendto() | 
                    For UDP: ip::udp::socket::send_to(),
                    ip::udp::socket::async_send_to()
                   
                    basic_datagram_socket::send_to(),
                    basic_datagram_socket::async_send_to()
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                    setsockopt() | 
                    For TCP: ip::tcp::acceptor::set_option(),
                    ip::tcp::socket::set_option()
                   
                    For UDP: ip::udp::socket::set_option()
                   
                    basic_socket::set_option()
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                    shutdown() | 
                    For TCP: ip::tcp::socket::shutdown()
                   
                    For UDP: ip::udp::socket::shutdown()
                   
                    basic_socket::shutdown()
                   | 
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                    sockatmark() | 
                    For TCP: ip::tcp::socket::at_mark()
                   
                    basic_socket::at_mark()
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                    socket() | 
                    For TCP: ip::tcp::acceptor::open(),
                    ip::tcp::socket::open()
                   
                    For UDP: ip::udp::socket::open()
                   
                    basic_socket::open()
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                    socketpair() | 
                    local::connect_pair()
                   
                    Note: POSIX operating systems only.
                   |