irb(main):001:0> require 'Qt'
=> true
irb(main):002:0> qsd = Qt::SocketDevice.new
=> #<Qt::SocketDevice:0x2aaaabbafec0>
irb(main):003:0> qha = Qt::HostAddress.new
=> #<Qt::HostAddress:0x2aaaabba4688>
irb(main):004:0> qha.setAddress('127.0.0.1')
=> true
irb(main):005:0> qha
=> #<Qt::HostAddress:0x2aaaabba4688>
irb(main):006:0> qha.toString
=> "127.0.0.1"
irb(main):007:0> qsd.bind(qha, 0)
NoMethodError: undefined method `bind' for #<Qt::SocketDevice:0x2aaaabbafec0>
        from (irb):7:in `method_missing'
        from (irb):7
        from :0
irb(main):008:0> qsd.connect(qha, 0)
NoMethodError: undefined method `connect' for #<Qt::SocketDevice:0x2aaaabbafec0>
        from (irb):8:in `method_missing'
        from (irb):8
        from :0
irb(main):009:0>       Qt.debug_level = Qt::DebugLevel::High
=> 2
irb(main):010:0> qsd.bind(qha, 0)
classname    == QSocketDevice
:: method == bind
-> methodIds == [9579]
candidate list:
        bool QSocketDevice::bind(const QHostAddress&, Q_UINT16)  (9579)
matching => 9579
      const QHostAddress& (QHostAddress)
      Q_UINT16 (i)
match => 9579 score: -98
Possible prototypes:
        void QSocketDevice::setAddressReusable(bool)
        enum QSocketDevice::InternalError
        enum QSocketDevice::ConnectionRefused
        int QSocketDevice::socket() const
        QIODevice::Offset QSocketDevice::size() const
        QSocketDevice::Error QSocketDevice::error() const
        bool QSocketDevice::bind(const QHostAddress&, Q_UINT16)
        bool QSocketDevice::atEnd() const
        int QSocketDevice::accept()
        enum QSocketDevice::Datagram
        void QSocketDevice::setBlocking(bool)
        int QSocketDevice::sendBufferSize() const
        QSocketDevice::Protocol QSocketDevice::protocol() const
        void QSocketDevice::close()
        void QSocketDevice::setSocket(int, QSocketDevice::Type)
        QSocketDevice* QSocketDevice::QSocketDevice(QSocketDevice::Type, QSocketDevice::Protocol, int)
        QSocketDevice::Type QSocketDevice::type() const
        bool QSocketDevice::open(int)
        bool QSocketDevice::connect(const QHostAddress&, Q_UINT16)
        enum QSocketDevice::Stream
        QSocketDevice* QSocketDevice::QSocketDevice(int, QSocketDevice::Type)
        enum QSocketDevice::NoFiles
        Q_LONG QSocketDevice::readBlock(char*, Q_ULONG)
        int QSocketDevice::putch(int)
        Q_UINT16 QSocketDevice::port() const
        enum QSocketDevice::IPv4
        void QSocketDevice::~QSocketDevice()
        int QSocketDevice::ungetch(int)
        void QSocketDevice::setReceiveBufferSize(uint)
        bool QSocketDevice::at(QIODevice::Offset)
        Q_LONG QSocketDevice::writeBlock(const char*, Q_ULONG)
        void QSocketDevice::setSendBufferSize(uint)
        Q_UINT16 QSocketDevice::peerPort() const
        QHostAddress QSocketDevice::peerAddress() const
        bool QSocketDevice::listen(int)
        bool QSocketDevice::isValid() const
        enum QSocketDevice::NoError
        enum QSocketDevice::IPv6
        Q_LONG QSocketDevice::writeBlock(const char*, Q_ULONG, const QHostAddress&, Q_UINT16)
        void QSocketDevice::setError(QSocketDevice::Error)
        int QSocketDevice::receiveBufferSize() const
        void QSocketDevice::flush()
        Q_LONG QSocketDevice::bytesAvailable() const
        QIODevice::Offset QSocketDevice::at() const
        enum QSocketDevice::UnknownError
        QSocketDevice* QSocketDevice::QSocketDevice()
        enum QSocketDevice::NoResources
        Q_LONG QSocketDevice::waitForMore(int, bool*) const
        Q_LONG QSocketDevice::waitForMore(int) const
        int QSocketDevice::getch()
        bool QSocketDevice::addressReusable() const
        QHostAddress QSocketDevice::address() const
        enum QSocketDevice::Inaccessible
        enum QSocketDevice::Bug
        bool QSocketDevice::blocking() const
        enum QSocketDevice::Unknown
        QSocketDevice* QSocketDevice::QSocketDevice(QSocketDevice::Type)
        enum QSocketDevice::NetworkFailure
        enum QSocketDevice::Impossible
        enum QSocketDevice::AlreadyBound
setCurrentMethod()
NoMethodError: undefined method `bind' for #<Qt::SocketDevice:0x2aaaabbafec0>
        from (irb):10:in `method_missing'
        from (irb):10
        from :0
irb(main):011:0> Q_UINT16
NameError: uninitialized constant Q_UINT16
        from (irb):11
        from :0