All Classes

QAbstractAnimation	The QAbstractAnimation class is the base of all animations.
QAbstractAxis	The QAbstractAxis class is the base class of the axes of a chart.
QAbstractBarSeries	The QAbstractBarSeries class is the base class of the bar series.
QAbstractButton	The QAbstractButton class is the abstract base class of button widgets.
QAbstractEventDispatcher	The QAbstractEventDispatcher class provides an interface to manage Nt's event queue.
QAbstractEventDispatcher::TimerInfo	The TimerInfo struct describes a timer that is registered with an event dispatcher.
QAbstractHttpServer	The QAbstractHttpServer class is the base of HTTP servers: it accepts connections and parses requests.
QAbstractItemDelegate	The QAbstractItemDelegate class is used to display and edit data items from a model.
QAbstractItemModel	The QAbstractItemModel class provides the abstract interface for item model classes.
QAbstractItemView	The QAbstractItemView class provides the basic functionality for item view classes.
QAbstractListModel	The QAbstractListModel class provides an abstract model that can be subclassed to create one-dimensional list models.
QAbstractProxyModel	The QAbstractProxyModel class provides a base class for proxy item models that can do sorting, filtering or other data processing tasks.
QAbstractScrollArea	The QAbstractScrollArea class is the base class of widgets that scroll their contents.
QAbstractSeries	The QAbstractSeries class is the base class of the data series of a chart.
QAbstractSlider	The QAbstractSlider class is the base of the widgets that pick an integer value from a range.
QAbstractSocket	The QAbstractSocket class is the base class of QTcpSocket and QUdpSocket.
QAbstractSpinBox	The QAbstractSpinBox class is the base of the widgets that show a value in a text with two buttons that step it.
QAbstractTableModel	The QAbstractTableModel class provides an abstract model that can be subclassed to create table models.
QAbstractTextDocumentLayout	The QAbstractTextDocumentLayout class is an abstract base class used to implement custom layouts for QTextDocuments.
QAction	The QAction class describes something that a user can do, which a menu, a tool button and a shortcut share.
QActionEvent	The QActionEvent class provides an event that is sent when an action of a widget is added, removed or changed.
QActionGroup	The QActionGroup class groups actions together.
QAdoptSharedDataTag	The QAdoptSharedDataTag struct tags a QSharedDataPointer constructor that adopts data.
QAnimationGroup	The QAnimationGroup class is an abstract base class for groups of animations.
QAnyStringView	The QAnyStringView class provides a unified view on Latin-1, UTF-8 or UTF-16 strings.
QApplication	The QApplication class manages the GUI application's control flow and main settings.
QApplicationStatic	The QApplicationStatic class holds a global object that lives as long as the application object.
QAreaSeries	The QAreaSeries class fills the area between two lines, or below one.
QArgument	The QArgument class is a template helper that holds an argument of type `T`.
QAssocConstIterator	The QAssocConstIterator class provides the Java-style const iterator behind QMapIterator, QMultiMapIterator and QHashIterator.
QAssocMutableIterator	The QAssocMutableIterator class provides the Java-style non-const iterator behind QMutableMapIterator, QMutableMultiMapIterator and QMutableHashIterator.
QAssociativeIterable	The QAssociativeIterable class is an iterable interface for an associative container in a QVariant.
QAssociativeIterable::const_iterator	The const_iterator class is a read-only iterator over a QAssociativeIterable.
QAtomicInteger	The QAtomicInteger class provides platform-independent atomic operations on integers.
QAtomicPointer	The QAtomicPointer class is a template class that provides platform-independent atomic operations on pointers.
QAtomicScopedValueRollback	The QAtomicScopedValueRollback class resets an atomic variable to its previous value on destruction.
QBEInteger	The QBEInteger class provides an integer that is stored in big-endian byte order.
QBackingStore	The QBackingStore class provides the backing store for a QWindow.
QBarCategoryAxis	The QBarCategoryAxis class is an axis of named categories, as bar charts have.
QBarSeries	The QBarSeries class draws its sets as vertical bars side by side.
QBarSet	The QBarSet class is one set of values of a bar series, drawn as bars of one color.
QBasicTimer	The QBasicTimer class provides timer events for objects.
QBitArray	The QBitArray class provides an array of bits.
QBitRef	The QBitRef class is an internal helper for the QBitArray class.
QBoxLayout	The QBoxLayout class lines up child widgets horizontally or vertically.
QBrush	The QBrush class defines the fill pattern of shapes drawn by QPainter.
QBuffer	The QBuffer class provides a QIODevice interface for a QByteArray.
QButtonGroup	The QButtonGroup class organizes buttons that belong together, such as a choice of radio buttons.
QByteArray	The QByteArray class provides an array of bytes.
QByteArray::FromBase64Result	The QByteArray::FromBase64Result class holds the result of QByteArray::fromBase64Encoding().
QByteArrayList	The QByteArrayList class provides a list of byte arrays.
QByteArrayMatcher	The QByteArrayMatcher class holds a sequence of bytes that can be quickly matched in a byte array.
QByteArrayView	The QByteArrayView class provides a view on an array of bytes with a read-only subset of the QByteArray API.
QCache	The QCache class is a template class that provides a cache.
QCalendar	The QCalendar class describes calendar systems.
QCalendar::YearMonthDay	The YearMonthDay class holds the year, month and day of a date in a calendar.
QCalendarWidget	The QCalendarWidget class shows a month and lets the user pick a date.
QCborArray	The QCborArray class is used to hold an array of CBOR elements.
QCborArray::ConstIterator	The ConstIterator class is the iterator of QCborArray that reads elements.
QCborArray::Iterator	The Iterator class is the iterator of QCborArray that can change elements.
QCborError	The QCborError class holds the error condition found while parsing or validating a CBOR stream.
QCborMap	The QCborMap class is used to hold an associative container representable in CBOR.
QCborMap::ConstIterator	The ConstIterator class is the iterator of QCborMap that reads pairs.
QCborMap::Iterator	The Iterator class is the iterator of QCborMap that can change values.
QCborParserError	The QCborParserError class is used by QCborValue to report a parsing error.
QCborStreamReader	The QCborStreamReader class is a simple CBOR stream decoder, operating on either a QByteArray or a QIODevice.
QCborStreamReader::StringResult	The StringResult class holds a chunk of a string that QCborStreamReader read.
QCborStreamWriter	The QCborStreamWriter class is a simple CBOR encoder operating on a one-way stream.
QCborValue	The QCborValue class encapsulates a value in CBOR.
QCborValueConstRef	The QCborValueConstRef class is a reference to a value in a QCborArray or QCborMap that cannot be changed.
QCborValueRef	The QCborValueRef class is a reference to a value in a QCborArray or QCborMap.
QChar	The QChar class provides a 16-bit Unicode code unit.
QChart	The QChart class holds the series, axes, legend and title of a chart, and draws them.
QChartView	The QChartView class is a widget that shows a chart.
QCheckBox	The QCheckBox class provides a checkbox with a text label.
QChildEvent	The QChildEvent class contains event parameters for child object events.
QChronoTimer	The QChronoTimer class provides repetitive and single-shot timers with intervals given as std::chrono durations.
QCloseEvent	The QCloseEvent class contains parameters that describe a close event.
QCollator	The QCollator class compares strings according to a localized collation algorithm.
QCollatorSortKey	The QCollatorSortKey class can be used to speed up string collation.
QColor	The QColor class provides colors based on RGB values.
QColorDialog	The QColorDialog class lets the user choose a color.
QComboBox	The QComboBox class is a button that drops down a list of items to choose from.
QCommandLineOption	The QCommandLineOption class defines a possible command-line option.
QCommandLineParser	The QCommandLineParser class provides a means for handling the command line options.
QCommandLinkButton	The QCommandLinkButton class provides a large flat button with an arrow, a title and a description.
QCompleter	The QCompleter class completes what the user types from a list of words.
QConcatenateTablesProxyModel	The QConcatenateTablesProxyModel class proxies multiple source models, concatenating their rows.
QConicalGradient	The QConicalGradient class changes color around a center.
QContiguousCache	The QContiguousCache class is a template class that provides an efficient cache for a contiguous range of indexes.
QCoreApplication	The QCoreApplication class provides an event loop for console applications.
QCryptographicHash	The QCryptographicHash class provides a way to generate cryptographic hashes.
QCursor	The QCursor class provides a mouse cursor with one of the standard shapes.
QDBus	The QDBus namespace contains the call modes of Nt D-Bus.
QDBusAbstractAdaptor	The QDBusAbstractAdaptor class is the base class of D-Bus adaptor classes.
QDBusAbstractInterface	The QDBusAbstractInterface class is the base class for all D-Bus interfaces in the Nt D-Bus binding, allowing access to remote interfaces.
QDBusArgument	The QDBusArgument class is used to marshall and demarshall D-Bus arguments.
QDBusConnection	The QDBusConnection class represents a connection to the D-Bus bus daemon.
QDBusConnectionInterface	The QDBusConnectionInterface class provides access to the D-Bus bus daemon service.
QDBusContext	The QDBusContext class allows slots to determine the D-Bus context of the calls.
QDBusError	The QDBusError class represents an error received from the D-Bus bus or from remote applications found on it.
QDBusInterface	The QDBusInterface class is a proxy for interfaces on remote objects.
QDBusMessage	The QDBusMessage class represents one message sent or received over the D-Bus bus.
QDBusMetaType	The QDBusMetaType class allows you to register types for use with D-Bus.
QDBusObjectPath	The QDBusObjectPath class enables the programmer to identify the OBJECT_PATH type provided by the D-Bus typesystem.
QDBusPendingCall	The QDBusPendingCall class refers to one pending asynchronous call.
QDBusPendingCallWatcher	The QDBusPendingCallWatcher class provides a convenient way of waiting for asynchronous replies.
QDBusPendingReply	The QDBusPendingReply class contains the reply to an asynchronous method call.
QDBusReply	The QDBusReply class stores the reply for a method call to a remote object.
QDBusServer	The QDBusServer class provides peer-to-peer communication between processes on the same computer.
QDBusServiceWatcher	The QDBusServiceWatcher class allows the user to watch for a bus service change.
QDBusSignature	The QDBusSignature class enables the programmer to identify the SIGNATURE type provided by the D-Bus typesystem.
QDBusUnixFileDescriptor	The QDBusUnixFileDescriptor class holds one Unix file descriptor.
QDBusVariant	The QDBusVariant class enables the programmer to identify the variant type provided by the D-Bus typesystem.
QDBusVirtualObject	The QDBusVirtualObject class is used to handle several D-Bus paths with one class.
QDataStream	The QDataStream class provides serialization of binary data to a QIODevice.
QDate	The QDate class provides date functions.
QDateEdit	The QDateEdit class lets the user edit a date.
QDateTime	The QDateTime class provides date and time functions.
QDateTimeAxis	The QDateTimeAxis class is an axis of dates and times.
QDateTimeEdit	The QDateTimeEdit class lets the user edit a date and a time.
QDeadlineTimer	The QDeadlineTimer class marks a deadline in the future.
QDebug	The QDebug class provides an output stream for debugging information.
QDebugStateSaver	The QDebugStateSaver class saves and restores the formatting state of a QDebug stream.
QDial	The QDial class provides a round knob that picks a value from a range.
QDialog	The QDialog class is the base class of dialog windows.
QDialogButtonBox	The QDialogButtonBox class lays out the buttons of a dialog in the order of the platform.
QDir	The QDir class provides access to directory structures and their contents.
QDirIterator	The QDirIterator class provides an iterator for directory entries.
QDirListing	The QDirListing class provides an STL-style iterator for directory entries.
QDirListing::DirEntry	The DirEntry class describes one entry of a QDirListing.
QDirListing::const_iterator	The const_iterator class is the input iterator of a QDirListing.
QDirListing::sentinel	The sentinel class marks the end of a QDirListing.
QDockWidget	The QDockWidget class provides a panel that sits at a side of a QMainWindow or floats as a window.
QDoubleSpinBox	The QDoubleSpinBox class lets the user pick a floating-point number by typing it or stepping with two buttons.
QDynamicPropertyChangeEvent	The QDynamicPropertyChangeEvent class contains event parameters for dynamic property changes.
QEasingCurve	The QEasingCurve class provides easing curves for controlling animation.
QElapsedTimer	The QElapsedTimer class provides a fast way to calculate elapsed times.
QEnableSharedFromThis	The QEnableSharedFromThis class lets an object create shared pointers to itself.
QEnterEvent	The QEnterEvent class contains parameters that describe an enter event.
QErrorMessage	The QErrorMessage class shows error messages that the user can choose not to see again.
QEvent	The QEvent class is the base class of all event classes.
QEventLoop	The QEventLoop class provides a means of entering and leaving an event loop.
QEventLoopLocker	The QEventLoopLocker class provides a means to quit an event loop when it is no longer needed.
QException	The QException class provides a base class for exceptions that can transferred across threads.
QExplicitlySharedDataPointer	The QExplicitlySharedDataPointer class represents a pointer to an explicitly shared object.
QExposeEvent	The QExposeEvent class contains event parameters for expose events.
QFile	The QFile class provides an interface for reading from and writing to files.
QFileDevice	The QFileDevice class is the base class of devices that read and write files.
QFileDialog	The QFileDialog class lets the user choose files or a directory.
QFileInfo	The QFileInfo class provides information about a file's name, location, type and metadata.
QFileSelector	The QFileSelector class provides a convenient way of selecting file variants.
QFileSystemWatcher	The QFileSystemWatcher class provides an interface for monitoring files and directories for modifications.
QFlag	The QFlag class is a helper data type for QFlags.
QFlags	The QFlags class stores OR combinations of enum values in a type-safe way.
QFocusEvent	The QFocusEvent class contains event parameters for widget and window focus events.
QFocusFrame	The QFocusFrame class draws a frame around a widget, outside it.
QFont	The QFont class specifies a font used for drawing text.
QFontComboBox	The QFontComboBox class lets the user choose a font family from a list.
QFontDialog	The QFontDialog class lets the user choose a font.
QFontMetrics	The QFontMetrics class provides font metrics information.
QFormLayout	The QFormLayout class lays out a form of labels and fields.
QFrame	The QFrame class is the base class of widgets that can have a frame.
QFuture	The QFuture class represents the result of an asynchronous computation.
QFutureInterface	The QFutureInterface class allows the compution to report its state and results to a QFuture.
QFutureInterfaceBase	The QFutureInterfaceBase class is the non-template base of QFutureInterface.
QFutureSynchronizer	The QFutureSynchronizer class is a convenience class that simplifies QFuture synchronization.
QFutureWatcher	The QFutureWatcher class allows monitoring a QFuture using signals and slots.
QFutureWatcherBase	The QFutureWatcherBase class is the base of QFutureWatcher, and holds its signals and slots.
QGenericArgument	The QGenericArgument class is an internal helper class for marshalling arguments.
QGenericReturnArgument	The QGenericReturnArgument class is an internal helper class for marshalling return values.
QGlobalStatic	The QGlobalStatic class is used to implement a global static object.
QGpioLine	The QGpioLine class reads or drives one general-purpose I/O line.
QGradient	The QGradient class is the base of the gradients that brushes fill with.
QGridLayout	The QGridLayout class lays out widgets in a grid of rows and columns.
QGroupBox	The QGroupBox class is a frame with a title that groups other widgets.
QGuiApplication	The QGuiApplication class manages the GUI application's control flow and main settings.
QHBoxLayout	The QHBoxLayout class lines up widgets horizontally.
QHash	The QHash class is a template class that provides a hash-table-based dictionary.
QHash::TryEmplaceResult	The QHash::TryEmplaceResult struct is the result of QHash::tryEmplace() and its relatives.
QHeaderView	The QHeaderView class provides the row or column headers of a table.
QHelpEvent	The QHelpEvent class asks a widget for the help it has at a position, such as a tool tip.
QHideEvent	The QHideEvent class provides an event that is sent when a window is hidden.
QHorizontalBarSeries	The QHorizontalBarSeries class draws its sets as horizontal bars side by side.
QHorizontalPercentBarSeries	The QHorizontalPercentBarSeries class draws its sets as shares of each category, horizontally.
QHorizontalStackedBarSeries	The QHorizontalStackedBarSeries class stacks its sets in horizontal bars.
QHostAddress	The QHostAddress class provides an IP address.
QHostInfo	The QHostInfo class provides host name lookup.
QHttpHeaders	The QHttpHeaders class holds the header fields of an HTTP message.
QHttpServer	The QHttpServer class is an HTTP server that answers requests with routes.
QHttpServerRequest	The QHttpServerRequest class holds a request that a QAbstractHttpServer received.
QHttpServerResponder	The QHttpServerResponder class writes the response to one request.
QHttpServerResponse	The QHttpServerResponse class holds a complete response: a status code, header fields and a body.
QHttpServerRouterRule	The QHttpServerRouterRule class is a rule that QHttpServer::route() added.
QHttpServerWebSocketUpgradeResponse	The QHttpServerWebSocketUpgradeResponse class is the verdict of a verifier on a WebSocket upgrade request.
QIODevice	The QIODevice class is the abstract base class of all I/O devices.
QIODeviceBase	The QIODeviceBase class provides the open mode flags shared by I/O devices.
QIPv6Address	The QIPv6Address class stores an IPv6 address in a 16-byte array.
QIdentityProxyModel	The QIdentityProxyModel class proxies its source model unmodified.
QImage	The QImage class provides a hardware-independent image of 32-bit pixels.
QInputDialog	The QInputDialog class asks the user for a single value: a text, an item of a list, or a number.
QInputEvent	The QInputEvent class is the base class for events that describe user input.
QItemSelection	The QItemSelection class manages information about selected items in a model.
QItemSelectionModel	The QItemSelectionModel class keeps track of a view's selected items.
QItemSelectionRange	The QItemSelectionRange class manages information about a range of selected items in a model.
QJSEngine	The QJSEngine class runs JavaScript programs.
QJSValue	The QJSValue class holds a value of a JavaScript engine.
QJSValueIterator	The QJSValueIterator class iterates over the enumerable own properties of an object.
QJsonArray	The QJsonArray class encapsulates a JSON array.
QJsonArray::const_iterator	The QJsonArray::const_iterator class is an STL-style const iterator for QJsonArray.
QJsonArray::iterator	The QJsonArray::iterator class is an STL-style non-const iterator for QJsonArray.
QJsonDocument	The QJsonDocument class provides a way to read and write JSON documents.
QJsonObject	The QJsonObject class encapsulates a JSON object.
QJsonObject::const_iterator	The QJsonObject::const_iterator class is an STL-style const iterator for QJsonObject.
QJsonObject::iterator	The QJsonObject::iterator class is an STL-style non-const iterator for QJsonObject.
QJsonParseError	The QJsonParseError struct is used to report errors during JSON parsing.
QJsonValue	The QJsonValue class encapsulates a value in JSON.
QJsonValueConstRef	The QJsonValueConstRef class is a read-only reference to a value inside an array or object.
QJsonValueRef	The QJsonValueRef class is a helper class for QJsonArray and QJsonObject.
QKeyEvent	The QKeyEvent class describes a key event.
QKeySequence	The QKeySequence class encapsulates a key combination used by a shortcut.
QKeySequenceEdit	The QKeySequenceEdit class lets the user enter a key sequence, such as a shortcut.
QKeyValueIterator	The QKeyValueIterator class is an iterator over the key and value pairs of an associative container.
QKeyValueIterator::pointer
QLCDNumber	The QLCDNumber class shows a number with digits that look like those of a calculator.
QLEInteger	The QLEInteger class provides an integer that is stored in little-endian byte order.
QLabel	The QLabel class displays text.
QLatin1Char	The QLatin1Char class provides an 8-bit ASCII/Latin-1 character.
QLatin1StringMatcher	The QLatin1StringMatcher class searches for a Latin-1 pattern in Latin-1 and UTF-16 text.
QLatin1StringView	The QLatin1StringView class provides a thin wrapper around a US-ASCII/Latin-1 encoded string literal.
QLayout	The QLayout class is the base class of geometry managers.
QLayoutItem	The QLayoutItem class provides an abstract item that a QLayout manipulates.
QLegend	The QLegend class is the legend of a chart.
QLibrary	The QLibrary class loads shared libraries at runtime.
QLibraryInfo	The QLibraryInfo class reports how the Nt library was built.
QLine	The QLine class provides a two-dimensional vector using integer precision.
QLineEdit	The QLineEdit class is a one-line text editor.
QLineF	The QLineF class provides a two-dimensional vector using floating point precision.
QLineSeries	The QLineSeries class draws its points joined by straight lines.
QLinearGradient	The QLinearGradient class changes color along a line.
QList	The QList class is a template class that provides a dynamic array.
QListIterator	The QListIterator class provides a Java-style const iterator for QList.
QListWidget	The QListWidget class provides a list of items, one on each row.
QListWidgetItem	The QListWidgetItem class is a row of a QListWidget.
QLocalServer	The QLocalServer class accepts connections from other processes on the same machine.
QLocalSocket	The QLocalSocket class provides a local stream socket for talking to another process on the same machine.
QLocale	The QLocale class converts between numbers, dates and their string representations in various languages.
QLockFile	The QLockFile class provides locking between processes using a file.
QLogValueAxis	The QLogValueAxis class is an axis with a logarithmic scale.
QLoggingCategory	The QLoggingCategory class represents a category, or 'area', in the logging infrastructure.
QMainWindow	The QMainWindow class provides the main window of an application.
QMap	The QMap class is a template class that provides an ordered associative container.
QMargins	The QMargins class defines the four margins of a rectangle.
QMarginsF	The QMarginsF class defines the four margins of a rectangle using floating point precision.
QMaskGenerator	The QMaskGenerator class is the base of generators of the masking keys that WebSocket clients use.
QMdiArea	The QMdiArea class provides an area in which sub-windows are shown, for an application with many documents.
QMdiSubWindow	The QMdiSubWindow class is a window inside a QMdiArea.
QMenu	The QMenu class provides a menu: a list of actions to choose from.
QMenuBar	The QMenuBar class provides a row of menu titles, usually at the top of a window.
QMessageAuthenticationCode	The QMessageAuthenticationCode class provides a way to generate hash-based message authentication codes.
QMessageBox	The QMessageBox class shows a message and asks the user to answer with a button.
QMessageLogContext	The QMessageLogContext class carries information about the origin of a log message.
QMessageLogger	The QMessageLogger class generates log messages.
QMetaClassInfo	The QMetaClassInfo class provides additional information about a class.
QMetaEnum	The QMetaEnum class provides meta-data about an enumerator.
QMetaMethod	The QMetaMethod class provides meta-data about a member function.
QMetaObject	The QMetaObject class contains meta-information about Nt objects.
QMetaObject::Connection	The Connection class represents a handle to a signal-slot connection.
QMetaProperty	The QMetaProperty class provides meta-data about a property.
QMetaType	The QMetaType class manages named types in the meta-object system.
QMetaTypeId	The QMetaTypeId class is the trait that `Q_DECLARE_METATYPE()` specializes.
QMimeData	The QMimeData class provides a container for data that records information about its MIME type.
QMimeDatabase	The QMimeDatabase class maintains a database of MIME types.
QMimeType	The QMimeType class describes types of file or data, represented by a MIME type string.
QModelIndex	The QModelIndex class is used to locate data in a data model.
QMouseEvent	The QMouseEvent class contains parameters that describe a mouse event.
QMoveEvent	The QMoveEvent class contains event parameters for move events.
QMultiHash	The QMultiHash class is a template class that provides a hash-table-based multi-valued dictionary.
QMultiMap	The QMultiMap class is a template class that provides an ordered associative container with multiple values per key.
QMutableListIterator	The QMutableListIterator class provides a Java-style non-const iterator for QList.
QMutableSetIterator	The QMutableSetIterator class provides a Java-style non-const iterator for QSet.
QMutex	The QMutex class provides access serialization between threads.
QMutexLocker	The QMutexLocker class is a convenience class that simplifies locking and unlocking mutexes.
QNetworkAccessManager	The QNetworkAccessManager class sends HTTP requests and returns the replies.
QNetworkAddressEntry	The QNetworkAddressEntry class stores one IP address of a network interface, with its netmask and broadcast address.
QNetworkDatagram	The QNetworkDatagram class represents a UDP datagram.
QNetworkInterface	The QNetworkInterface class lists the host's network interfaces and their addresses.
QNetworkReply	The QNetworkReply class holds the response to a QNetworkAccessManager request.
QNetworkRequest	The QNetworkRequest class describes a network request: a URL plus headers and transfer settings.
QNoDebug	The QNoDebug class is a stream that discards everything written to it.
QObject	The QObject class is the base class of all Nt objects that use signals and slots.
QObjectCleanupHandler	The QObjectCleanupHandler class watches the lifetime of multiple QObjects.
QOffscreenSurface	The QOffscreenSurface class represents an offscreen surface in the underlying platform.
QOpenGLContext	The QOpenGLContext class represents a native OpenGL context, which renders with OpenGL on a QSurface.
QOpenGLFramebufferObject	The QOpenGLFramebufferObject class encapsulates an OpenGL framebuffer object.
QOpenGLFramebufferObjectFormat	The QOpenGLFramebufferObjectFormat class specifies the format of an OpenGL framebuffer object.
QOpenGLFunctions	The QOpenGLFunctions class provides the OpenGL ES 2.0 API on desktop OpenGL and OpenGL ES alike.
QOpenGLPaintDevice	The QOpenGLPaintDevice class enables painting to an OpenGL context using QPainter.
QOpenGLWindow	The QOpenGLWindow class is a convenience subclass of QWindow to perform OpenGL painting.
QOperatingSystemVersion	The QOperatingSystemVersion class provides information about the operating system version.
QOverload	The QOverload struct helps to select an overloaded member function.
QPaintDevice	The QPaintDevice class is the base class of objects that QPainter can paint on.
QPaintDeviceWindow	The QPaintDeviceWindow class is the base class for windows that are paint devices.
QPaintEngine	The QPaintEngine class defines how a QPainter draws on a particular kind of paint device.
QPaintEngineState	The QPaintEngineState class describes the state a QPainter hands to its paint engine.
QPaintEvent	The QPaintEvent class contains event parameters for paint events.
QPainter	The QPainter class performs low-level painting on widgets and other paint devices.
QPainterPath	The QPainterPath class is a shape made of lines and curves, for QPainter to fill and stroke.
QPainterPath::Element	The QPainterPath::Element class is one point of a path.
QPalette	The QPalette class contains color groups for each widget state.
QParallelAnimationGroup	The QParallelAnimationGroup class provides a parallel group of animations.
QPartialOrdering	The QPartialOrdering class represents the result of a comparison that allows for unordered results.
QPauseAnimation	The QPauseAnimation class provides a pause for QSequentialAnimationGroup.
QPen	The QPen class defines how QPainter draws lines and outlines.
QPercentBarSeries	The QPercentBarSeries class draws its sets as shares of each category.
QPersistentModelIndex	The QPersistentModelIndex class is used to locate data in a data model, and stays valid when the model changes.
QPieSeries	The QPieSeries class draws its slices as a pie or a donut.
QPieSlice	The QPieSlice class is one slice of a pie series.
QPixmap	The QPixmap class is an image to paint and to show, such as a splash screen or a picture in a label.
QPlainTextEdit	The QPlainTextEdit class is an editor for text of many lines.
QPoint	The QPoint class defines a point in the plane using integer precision.
QPointF	The QPointF class defines a point in the plane using floating point precision.
QPointer	The QPointer class is a template class that provides guarded pointers to QObject.
QPolygon	The QPolygon class is a list of points with integer coordinates.
QPolygonF	The QPolygonF class is a list of points with real coordinates.
QProcess	The QProcess class is used to start external programs and to communicate with them.
QProcessEnvironment	The QProcessEnvironment class holds the environment variables that can be passed to a program.
QProgressBar	The QProgressBar class shows how far an operation has come.
QProgressDialog	The QProgressDialog class shows the progress of a long task and lets the user cancel it.
QPromise	The QPromise class provides a way to store computation results to be accessed by QFuture.
QPropertyAnimation	The QPropertyAnimation class animates Qt properties.
QPushButton	The QPushButton class provides a command button.
QQmlApplicationEngine	The QQmlApplicationEngine class loads the main QML document of an application.
QQmlComponent	The QQmlComponent class makes objects from a QML document.
QQmlContext	The QQmlContext class is a scope of names for the expressions of a QML component.
QQmlContext::PropertyPair	A name and a value, for setContextProperties().
QQmlEngine	The QQmlEngine class makes objects from QML documents.
QQmlError	The QQmlError class describes an error in a QML document.
QQmlListProperty	The QQmlListProperty class is a list of objects that QML documents fill.
QQmlParserStatus	The QQmlParserStatus class tells an object when QML starts and finishes making it.
QQueue	The QQueue class is a template class that provides a queue.
QRadialGradient	The QRadialGradient class changes color in circles from a focal point.
QRadioButton	The QRadioButton class provides a radio button with a text label.
QRandomGenerator	The QRandomGenerator class allows one to obtain random values from a high-quality Random Number Generator.
QRandomGenerator64	The QRandomGenerator64 class allows one to obtain 64-bit random values from a high-quality Random Number Generator.
QRasterWindow	The QRasterWindow class is a convenience class for using QPainter on a QWindow.
QReadLocker	The QReadLocker class is a convenience class that simplifies locking and unlocking read-write locks for read access.
QReadWriteLock	The QReadWriteLock class provides read-write locking.
QRect	The QRect class defines a rectangle in the plane using integer precision.
QRectF	The QRectF class defines a rectangle in the plane using floating point precision.
QRecursiveMutex	The QRecursiveMutex class provides access serialization between threads.
QRegion	The QRegion class specifies a clip region for a painter.
QRegularExpression	The QRegularExpression class provides pattern matching using regular expressions.
QRegularExpressionMatch	The QRegularExpressionMatch class provides the results of matching a QRegularExpression against a string.
QRegularExpressionMatchIterator	The QRegularExpressionMatchIterator class provides an iterator on the results of a global match of a QRegularExpression against a string.
QRegularExpressionMatchIterator::RangeIterator	The RangeIterator class lets a range-based for loop walk over the matches.
QRegularExpressionMatchIterator::Sentinel	The Sentinel class marks the end of the matches in a range-based for loop.
QResizeEvent	The QResizeEvent class contains event parameters for resize events.
QResource	The QResource class provides an interface for reading directly from resources.
QReturnArgument	The QReturnArgument class is a template helper that holds a return value of type `T`.
QRubberBand	The QRubberBand class draws a rectangle or a line that shows a selection or a new position.
QRunnable	The QRunnable class is the base class for all runnable objects.
QSaveFile	The QSaveFile class provides an interface for safely writing to files.
QScatterSeries	The QScatterSeries class draws a marker at each of its points.
QScopeGuard	The QScopeGuard class calls a function when it goes out of scope.
QScopedArrayPointer	The QScopedArrayPointer class stores a pointer to a dynamically allocated array and deletes it on destruction.
QScopedPointer	The QScopedPointer class stores a pointer to a dynamically allocated object and deletes it on destruction.
QScopedPointerArrayDeleter	The QScopedPointerArrayDeleter struct is the cleanup handler of QScopedArrayPointer.
QScopedPointerDeleter	The QScopedPointerDeleter struct is the default cleanup handler of QScopedPointer.
QScopedValueRollback	The QScopedValueRollback class resets a variable to its previous value on destruction.
QScreen	The QScreen class is used to query screen properties.
QScrollArea	The QScrollArea class provides a scrolling view of another widget.
QScrollBar	The QScrollBar class provides a bar that scrolls the contents of a widget.
QSemaphore	The QSemaphore class provides a general counting semaphore.
QSemaphoreReleaser	The QSemaphoreReleaser class provides exception-safe deferral of a QSemaphore::release() call.
QSequentialAnimationGroup	The QSequentialAnimationGroup class provides a sequential group of animations.
QSequentialIterable	The QSequentialIterable class is an iterable interface for a container in a QVariant.
QSequentialIterable::const_iterator	The const_iterator class is a read-only iterator over a QSequentialIterable.
QSerialPort	The QSerialPort class provides access to a serial port.
QSerialPortInfo	The QSerialPortInfo class describes a serial port on the system.
QSet	The QSet class is a template class that provides a hash-table-based set.
QSetIterator	The QSetIterator class provides a Java-style const iterator for QSet.
QSettings	The QSettings class provides persistent platform-independent application settings.
QSharedData	The QSharedData class is a base class for shared data objects.
QSharedDataPointer	The QSharedDataPointer class represents a pointer to an implicitly shared object.
QSharedMemory	The QSharedMemory class provides access to a shared memory segment.
QSharedPointer	The QSharedPointer class holds a strong reference to a shared pointer.
QShowEvent	The QShowEvent class provides an event that is sent when a window is shown.
QSignalBlocker	The QSignalBlocker class exception-safely wraps QObject::blockSignals().
QSignalMapper	The QSignalMapper class bundles signals from identifiable senders.
QSignalSpy	The QSignalSpy class records the emissions of a signal.
QSize	The QSize class defines the size of a two-dimensional object using integer point precision.
QSizeF	The QSizeF class defines the size of a two-dimensional object using floating point precision.
QSizeGrip	The QSizeGrip class provides a corner handle for resizing a window.
QSizePolicy	The QSizePolicy class is a layout attribute describing horizontal and vertical resizing policy.
QSlider	The QSlider class provides a slider that picks a value from a range.
QSocketDescriptor	The QSocketDescriptor class wraps a native socket or file descriptor.
QSocketNotifier	The QSocketNotifier class provides a way to watch activity on a file descriptor.
QSortFilterProxyModel	The QSortFilterProxyModel class provides support for sorting and filtering data passed between another model and a view.
QSpacerItem	The QSpacerItem class provides blank space in a layout.
QSpan	The QSpan class provides a non-owning view of a contiguous sequence of elements.
QSpinBox	The QSpinBox class lets the user pick an integer by typing it or stepping with two buttons.
QSplashScreen	The QSplashScreen class shows a picture while the application starts.
QSplineSeries	The QSplineSeries class draws a smooth curve through its points.
QSplitter	The QSplitter class lets the user change the sizes of the widgets in it by dragging the bars between them.
QSql	The QSql namespace holds identifiers that are used throughout Nt SQL.
QSqlDatabase	The QSqlDatabase class handles a connection to a database.
QSqlDriver	The QSqlDriver class is an abstract base class for accessing specific SQL databases.
QSqlDriverCreator	The QSqlDriverCreator class is a template class that provides a SQL driver factory for a specific driver type.
QSqlDriverCreatorBase	The QSqlDriverCreatorBase class is the base class for SQL driver factories.
QSqlError	The QSqlError class provides SQL database error information.
QSqlField	The QSqlField class manipulates the fields of SQL database tables and views.
QSqlIndex	The QSqlIndex class provides functions to manipulate and describe database indexes.
QSqlQuery	The QSqlQuery class provides a means of executing and manipulating SQL statements.
QSqlQueryModel	The QSqlQueryModel class provides a read-only data model for SQL result sets.
QSqlRecord	The QSqlRecord class encapsulates a database record.
QSqlRelation	The QSqlRelation class stores information about an SQL foreign key.
QSqlRelationalTableModel	The QSqlRelationalTableModel class provides an editable data model for a single database table, with foreign key support.
QSqlResult	The QSqlResult class provides an abstract interface for accessing data from specific SQL databases.
QSqlTableModel	The QSqlTableModel class provides an editable data model for a single database table.
QSsl	The QSsl namespace holds enums shared by the TLS classes.
QSslCertificate	The QSslCertificate class holds an X.509 certificate.
QSslCipher	The QSslCipher class describes the cipher of a connection.
QSslConfiguration	The QSslConfiguration class holds the settings of a TLS connection.
QSslError	The QSslError class describes a problem found while verifying a peer.
QSslKey	The QSslKey class holds a public or private key.
QSslServer	The QSslServer class accepts TLS connections.
QSslSocket	The QSslSocket class provides an encrypted TCP connection using TLS.
QStack	The QStack class is a template class that provides a stack.
QStackedBarSeries	The QStackedBarSeries class stacks its sets in vertical bars.
QStackedLayout	The QStackedLayout class lays out widgets so that only one of them is visible at a time.
QStackedWidget	The QStackedWidget class is a stack of widgets of which only one is visible at a time.
QStandardPaths	The QStandardPaths class provides methods for accessing standard paths.
QStaticByteArrayMatcher	The QStaticByteArrayMatcher class is a QByteArrayMatcher whose pattern is known when the program is compiled.
QStatusBar	The QStatusBar class is a bar for messages and small widgets at the bottom of a window.
QStorageInfo	The QStorageInfo class provides information about currently mounted storage and drives.
QString	The QString class provides a Unicode character string.
QStringConverter	The QStringConverter class provides a base class for encoding and decoding text.
QStringConverterBase	The QStringConverterBase class provides the flags shared by the string converters.
QStringDecoder	The QStringDecoder class decodes bytes into a QString.
QStringEncoder	The QStringEncoder class encodes QString data into bytes.
QStringList	The QStringList class provides a list of strings.
QStringListModel	The QStringListModel class provides a model that supplies strings to views.
QStringMatcher	The QStringMatcher class holds a sequence of characters that can be quickly matched in a Unicode string.
QStringTokenizer	The QStringTokenizer class splits strings into tokens along given separators.
QStringTokenizer::iterator	The iterator class iterates over the tokens of a QStringTokenizer.
QStringTokenizer::sentinel	The sentinel class marks the end of a QStringTokenizer.
QStringView	The QStringView class provides a unified view on UTF-16 strings with a read-only subset of the QString API.
QStyle	The QStyle class is an abstract base class that encapsulates the look and feel of a GUI.
QStyleFactory	The QStyleFactory class creates QStyle objects.
QStyleHints	The QStyleHints class contains platform specific hints and settings.
QStyleOption	The QStyleOption class stores the parameters that QStyle functions use to draw.
QStyleOptionButton	The QStyleOptionButton class describes the parameters for drawing buttons.
QStyleOptionComboBox	The QStyleOptionComboBox class describes the parameters for drawing a combo box.
QStyleOptionFrame	The QStyleOptionFrame class describes the parameters for drawing a frame.
QStyleOptionGroupBox	The QStyleOptionGroupBox class describes the parameters for drawing a group box.
QStyleOptionHeader	The QStyleOptionHeader class describes the parameters for drawing one section of a header.
QStyleOptionMenuItem	The QStyleOptionMenuItem class describes the parameters for drawing an entry of a menu, or a title of a menu bar.
QStyleOptionProgressBar	The QStyleOptionProgressBar class describes the parameters for drawing a progress bar.
QStyleOptionSlider	The QStyleOptionSlider class describes the parameters for drawing a slider.
QStyleOptionSpinBox	The QStyleOptionSpinBox class describes the parameters for drawing a spin box.
QStyleOptionTab	The QStyleOptionTab class describes the parameters for drawing a tab of a tab bar.
QStyleOptionViewItem	The QStyleOptionViewItem class describes how an item of an item view is drawn.
QStyledItemDelegate	The QStyledItemDelegate class provides display and editing facilities for data items from a model.
QSurface	The QSurface class is an abstraction of renderable surfaces.
QSurfaceFormat	The QSurfaceFormat class represents the format of a QSurface.
QSvgGenerator	The QSvgGenerator class is a paint device that writes what is painted on it as an SVG document.
QSvgRenderer	The QSvgRenderer class draws the contents of SVG files with a QPainter.
QSvgWidget	The QSvgWidget class is a widget that shows the contents of an SVG file.
QSysInfo	The QSysInfo class provides information about the system.
QSystemSemaphore	The QSystemSemaphore class provides a general counting system semaphore.
QTabBar	The QTabBar class provides a row of tabs.
QTabWidget	The QTabWidget class is a stack of pages with a row of tabs to choose the page.
QTableWidget	The QTableWidget class provides a table of items.
QTableWidgetItem	The QTableWidgetItem class is a cell of a QTableWidget.
QTcpServer	The QTcpServer class provides a TCP-based server.
QTcpSocket	The QTcpSocket class provides a TCP socket.
QTemplatedMetaMethodReturnArgument	The QTemplatedMetaMethodReturnArgument class refers to the variable that receives the result of QMetaObject::invokeMethod().
QTemporaryDir	The QTemporaryDir class creates a unique directory for temporary use.
QTemporaryFile	The QTemporaryFile class is an I/O device that operates on temporary files.
QTest	The QTest namespace holds the functions behind Nt Test.
QTestData	The QTestData class is a row of test data under construction.
QTestEventLoop	The QTestEventLoop class runs an event loop in a test, with a timeout.
QTextBlock	The QTextBlock class provides a container for text fragments in a QTextDocument.
QTextBlockFormat	The QTextBlockFormat class provides formatting information for blocks of text in a QTextDocument.
QTextBoundaryFinder	The QTextBoundaryFinder class provides a way of finding Unicode text boundaries in a string.
QTextBrowser	The QTextBrowser class shows documents that the user can go back and forward through.
QTextCharFormat	The QTextCharFormat class provides formatting information for characters in a QTextDocument.
QTextCursor	The QTextCursor class is a position in the text of a QPlainTextEdit, with a selection, which can move and change the text.
QTextDocument	The QTextDocument class holds formatted text.
QTextEdit	The QTextEdit class shows rich text, and edits plain text.
QTextFormat	The QTextFormat class provides formatting information for a QTextDocument.
QTextLayout	The QTextLayout class is used to lay out and render text.
QTextLayout::FormatRange	The QTextLayout::FormatRange structure is used to apply extra formatting information for a specified area in the text layout's content.
QTextLine	The QTextLine class represents a line of text inside a QTextLayout.
QTextListFormat	The QTextListFormat class provides formatting information for lists in a QTextDocument.
QTextOption	The QTextOption class provides a description of general rich text properties.
QTextStream	The QTextStream class provides a convenient interface for reading and writing text.
QTextStreamManipulator	The QTextStreamManipulator class holds a deferred QTextStream setter call.
QThread	The QThread class provides a platform-independent way to manage threads.
QThreadPool	The QThreadPool class manages a collection of threads.
QThreadStorage	The QThreadStorage class provides per-thread data storage.
QTime	The QTime class provides clock time functions.
QTimeEdit	The QTimeEdit class lets the user edit a time.
QTimeLine	The QTimeLine class provides a timeline for controlling animations.
QTimeZone	The QTimeZone class identifies how a time representation relates to UTC.
QTimeZone::OffsetData	The OffsetData class describes the offsets of a zone at an instant.
QTimer	The QTimer class provides repetitive and single-shot timers.
QTimerEvent	The QTimerEvent class contains parameters that describe a timer event.
QToolBar	The QToolBar class provides a bar of buttons for actions.
QToolBox	The QToolBox class provides a column of items, one of which shows its widget at a time.
QToolButton	The QToolButton class is a small button for a command, usually with a short text or an arrow.
QToolTip	The QToolTip class shows a text in a small label next to the mouse.
QTransform	The QTransform class is a 2D transformation of the coordinate system.
QTranslator	The QTranslator class provides internationalization support for text output.
QTransposeProxyModel	The QTransposeProxyModel class provides a proxy that swaps the rows and columns of its source model.
QTreeView	The QTreeView class provides a default model/view implementation of a tree view.
QTreeWidget	The QTreeWidget class provides a tree view that uses a predefined tree model.
QTreeWidgetItem	The QTreeWidgetItem class provides an item for use with the QTreeWidget convenience class.
QTypeInfo	The QTypeInfo class describes how a type may be stored by a container.
QTypeRevision	The QTypeRevision class contains a QML type revision.
QUdpSocket	The QUdpSocket class provides a UDP socket.
QUnhandledException	The QUnhandledException class represents an unhandled exception in a worker thread.
QUrl	The QUrl class parses, builds and resolves URLs.
QUrlQuery	The QUrlQuery class reads and builds the key-value pairs of a URL query.
QUtf8StringView	The QUtf8StringView class provides a unified view on UTF-8 strings with a read-only subset of the QString API.
QUuid	The QUuid class stores a Universally Unique Identifier (UUID).
QUuid::Id128Bytes	The QUuid::Id128Bytes union holds the 16 bytes of a UUID.
QVBoxLayout	The QVBoxLayout class lines up widgets vertically.
QValueAxis	The QValueAxis class is an axis of real numbers.
QVarLengthArray	The QVarLengthArray class provides a low-level variable-length array.
QVariant	The QVariant class acts like a union for the most common Nt data types.
QVariantAnimation	The QVariantAnimation class provides a base class for animations.
QVersionNumber	The QVersionNumber class contains a version number with an arbitrary number of segments.
QWaitCondition	The QWaitCondition class provides a condition variable for synchronizing threads.
QWeakPointer	The QWeakPointer class holds a weak reference to a shared pointer.
QWebSocket	The QWebSocket class is a WebSocket connection, as a client or as one end accepted by a server.
QWebSocketCorsAuthenticator	The QWebSocketCorsAuthenticator class decides whether a WebSocket client's origin is accepted.
QWebSocketHandshakeOptions	The QWebSocketHandshakeOptions class holds options of a WebSocket client's opening handshake.
QWebSocketProtocol	The QWebSocketProtocol namespace holds the versions and close codes of the WebSocket protocol.
QWebSocketServer	The QWebSocketServer class accepts WebSocket connections.
QWheelEvent	The QWheelEvent class contains parameters that describe a wheel event.
QWidget	The QWidget class is the base class of all user interface objects.
QWidgetAction	The QWidgetAction class is an action that a widget stands for in a tool bar.
QWidgetItem	The QWidgetItem class is a layout item that represents a widget.
QWindow	The QWindow class represents a window in the underlying windowing system.
QWizard	The QWizard class leads the user through a task in a sequence of pages.
QWizardPage	The QWizardPage class is a page of a QWizard.
QWriteLocker	The QWriteLocker class is a convenience class that simplifies locking and unlocking read-write locks for write access.
QXYSeries	The QXYSeries class is the base class of series of points: lines, splines and scatter plots.
QXmlStreamAttribute	The QXmlStreamAttribute class represents a single XML attribute.
QXmlStreamAttributes	The QXmlStreamAttributes class represents a vector of QXmlStreamAttribute.
QXmlStreamEntityDeclaration	The QXmlStreamEntityDeclaration class represents a DTD entity declaration.
QXmlStreamEntityResolver	The QXmlStreamEntityResolver class provides an entity resolver for a QXmlStreamReader.
QXmlStreamNamespaceDeclaration	The QXmlStreamNamespaceDeclaration class represents a namespace declaration.
QXmlStreamNotationDeclaration	The QXmlStreamNotationDeclaration class represents a DTD notation declaration.
QXmlStreamReader	The QXmlStreamReader class provides a fast parser for reading well-formed XML.
QXmlStreamWriter	The QXmlStreamWriter class provides an XML writer with a simple streaming API.
Qt	The Qt namespace contains miscellaneous identifiers used throughout Nt.
QtConcurrent	The QtConcurrent namespace provides high-level APIs that make it possible to write multi-threaded programs without using low-level threading primitives.
QtConcurrent::QTaskBuilder	The QTaskBuilder class is used for adjusting the parameters of a task before it is started.
QtFM	The QtFM namespace holds Nt FM: an FM synthesiser for game sound effects.
QtFM::AudioOutput	The AudioOutput class is the interface of a sound output that an Engine renders into.
QtFM::Chip	The Chip class gives register-level access to a chip core that an Engine runs.
QtFM::ChipCore	The ChipCore class is the interface of a chip emulation core.
QtFM::Engine	The Engine class plays patches in real time, or renders them offline.
QtFM::EngineConfig	The EngineConfig struct holds the settings of an Engine, fixed when it is constructed.
QtFM::FmChip	The FmChip type holds the chips that FmSound::chip names, as `FmChip.OPL2`.
QtFM::FmEngine	The FmEngine singleton is the engine that every Nt FM QML type plays through.
QtFM::FmMusic	The FmMusic type plays chip music: VGM, VGZ, DRO and IMF files.
QtFM::FmPatch	The FmPatch singleton makes patches: generated, parsed or mutated.
QtFM::FmPatchValue	The FmPatchValue type holds one patch in QML, as FmPatch makes it.
QtFM::FmSequence	The FmSequence type plays notes on a tempo grid, for jingles.
QtFM::FmSound	The FmSound type is one sound effect: a patch, and how it plays.
QtFM::FmSoundBank	The FmSoundBank type loads a bank of patches, by name.
QtFM::MidiFile	The MidiFile class reads the notes of a Standard MIDI File.
QtFM::MidiFile::Control	The Control struct is a change of a channel's level, pan or pitch bend.
QtFM::MidiFile::Note	The Note struct is one note of a MidiFile.
QtFM::MidiPlayer	The MidiPlayer class plays a MidiFile on an Engine with FM instruments.
QtFM::MusicPlayer	The MusicPlayer class plays chip music from register logs.
QtFM::Patch	The Patch class holds one complete, self-describing sound.
QtFM::PatchBank	The PatchBank class holds a named set of patches, such as all the sounds of a game.
QtFM::PlayOptions	The PlayOptions struct holds how Engine::play() plays a patch.
QtFM::Sequence	The Sequence class holds timed notes on a tempo grid, for jingles and short cues.
QtFM::Sequence::Note	The Note struct is one note of a Sequence.
QtFM::VoiceHandle	The VoiceHandle class controls a voice that Engine::play() started.
QtFuture	The QtFuture namespace holds helpers for QFuture, such as QtFuture::Launch.
QtFuture::WhenAnyResult	The WhenAnyResult struct is the result of whenAny() on a range of futures.
QtSvg	The QtSvg namespace holds the options of the SVG classes.
q20	The q20 namespace holds C++20 library facilities for use from C++17.
qfloat16	The qfloat16 class provides 16-bit floating point support.