Qt Core C++ Classes

Provides core non-GUI functionality. More...

Namespaces

Qt	Contains miscellaneous identifiers used throughout the Qt library
Qt::Literals	Inline namespace declares literal operators for Qt types
Qt::Literals::StringLiterals	Declares string literal operators for Qt types
QtFuture	Contains miscellaneous identifiers used by the QFuture class
QtLiterals	Declares literal operators for Qt types

Classes

QAbstractAnimation	The base of all animations
QAbstractEventDispatcher	Interface to manage Qt's event queue
QAbstractEventDispatcher::TimerInfo
QAbstractItemModel	The abstract interface for item model classes
QAbstractListModel	Abstract model that can be subclassed to create one-dimensional list models
QAbstractNativeEventFilter	Interface for receiving native events, such as MSG or XCB event structs
QAbstractProxyModel	Base class for proxy item models that can do sorting, filtering or other data processing tasks
QAbstractTableModel	Abstract model that can be subclassed to create table models
QAdoptSharedDataTag	Helper tag class
QAnimationGroup	Abstract base class for groups of animations
QAnyStringView	Unified view on Latin-1, UTF-8, or UTF-16 strings with a read-only subset of the QString API
QAssociativeIterable	Iterable interface for an associative container in a QVariant
QAtomicInt	Platform-independent atomic operations on int
QAtomicInteger	Platform-independent atomic operations on integers
QAtomicPointer	Template class that provides platform-independent atomic operations on pointers
QBEInteger	Platform-independent big-endian integers
QBaseIterator
QBasicTimer	Timer events for objects
QBindable	Wrapper class around binding-enabled properties. It allows type-safe operations while abstracting the differences between the various property classes away
QBitArray	Array of bits
QBluetoothPermission	Access Bluetooth peripherals
QBuffer	QIODevice interface for a QByteArray
QByteArray	Array of bytes
QByteArray::FromBase64Result	QByteArray::FromBase64Result class holds the result of a call to QByteArray::fromBase64Encoding
QByteArrayList	List of byte arrays
QByteArrayMatcher	Holds a sequence of bytes that can be quickly matched in a byte array
QByteArrayView	View on an array of bytes with a read-only subset of the QByteArray API
QCache	Template class that provides a cache
QCalendar	Describes calendar systems
QCalendar::SystemId
QCalendarPermission	Access the user's calendar
QCameraPermission	Access the camera for taking pictures or videos
QCborArray	Used to hold an array of CBOR elements
QCborError	Holds the error condition found while parsing or validating a CBOR stream
QCborMap	Used to hold an associative container representable in CBOR
QCborMap::ConstIterator	QCborMap::ConstIterator class provides an STL-style const iterator for QCborMap
QCborMap::Iterator	QCborMap::Iterator class provides an STL-style non-const iterator for QCborMap
QCborParserError	Used by QCborValue to report a parsing error
QCborStreamReader	Simple CBOR stream decoder, operating on either a QByteArray or QIODevice
QCborStreamReader::StringResult
QCborStreamWriter	Simple CBOR encoder operating on a one-way stream
QCborValue	Encapsulates a value in CBOR
QChar	16-bit Unicode character
QChildEvent	Contains event parameters for child object events
QCollator	Compares strings according to a localized collation algorithm
QCollatorSortKey	Can be used to speed up string collation
QCommandLineOption	Defines a possible command-line option
QCommandLineParser	Means for handling the command line options
QConcatenateTablesProxyModel	Proxies multiple source models, concatenating their rows
QConstIterator	Allows iteration over a container in a QVariant
QContactsPermission	Access the user's contacts
QContiguousCache	Template class that provides a contiguous cache
QCoreApplication	Event loop for Qt applications without UI
QCryptographicHash	Way to generate cryptographic hashes
QDataStream	Serialization of binary data to a QIODevice
QDate	Date functions
QDateTime	Date and time functions
QDeadlineTimer	Marks a deadline in the future
QDebug	Output stream for debugging information
QDebugStateSaver	Convenience class for custom QDebug operators
QDir	Access to directory structures and their contents
QDirIterator	Iterator for directory entrylists
QDynamicPropertyChangeEvent	Contains event parameters for dynamic property change events
QEasingCurve	Easing curves for controlling animation
QElapsedTimer	Fast way to calculate elapsed times
QEnableSharedFromThis	A base class that allows obtaining a QSharedPointer for an object already managed by a shared pointer
QEvent	The base class of all event classes. Event objects contain event parameters
QEventLoop	Means of entering and leaving an event loop
QEventLoopLocker	Means to quit an event loop when it is no longer needed
QException	Base class for exceptions that can be transferred across threads
QExplicitlySharedDataPointer	Represents a pointer to an explicitly shared object
QFile	Interface for reading from and writing to files
QFileDevice	Interface for reading from and writing to open files
QFileInfo	System-independent file information
QFileSelector	Convenient way of selecting file variants
QFileSystemWatcher	Interface for monitoring files and directories for modifications
QFlag	Helper data type for QFlags
QFlags	Type-safe way of storing OR-combinations of enum values
QFuture	Represents the result of an asynchronous computation
QFutureIterator	Java-style const iterator for QFuture
QFutureSynchronizer	Convenience class that simplifies QFuture synchronization
QFutureWatcher	Allows monitoring a QFuture using signals and slots
QGenericArgument	Internal helper class for marshalling arguments
QGenericReturnArgument	Internal helper class for marshalling arguments
QGlobalStatic	Used to implement a global static object
QGregorianCalendar	Implements the Gregorian calendar
QHash	Template class that provides a hash-table-based dictionary
QHashIterator	Java-style const iterator for QHash and QMultiHash
QHashSeed
QIODevice	The base interface class of all I/O devices in Qt
QIODeviceBase	Base class for QIODevice that provides flags describing the mode in which a device is opened
QIdentityProxyModel	Proxies its source model unmodified
QItemSelection	Manages information about selected items in a model
QItemSelectionModel	Keeps track of a view's selected items
QItemSelectionRange	Manages information about a range of selected items in a model
QIterable	Template class that is the base class for QSequentialIterable and QAssociativeIterable
QIterator	Template class that allows iteration over a container in a QVariant
QJalaliCalendar	Jalali (Hijri Shamsi) calendar system implementation
QJniEnvironment	Access to the JNI Environment (JNIEnv)
QJniObject	A convenience wrapper around the Java Native Interface (JNI)
QJsonArray	Encapsulates a JSON array
QJsonDocument	Way to read and write JSON documents
QJsonObject	Encapsulates a JSON object
QJsonParseError	Used to report errors during JSON parsing
QJsonValue	Encapsulates a value in JSON
QJulianCalendar	Julian calendar system implementation
QKeyCombination	Stores a combination of a key with optional modifiers
QKeyValueIterator	Iterator over the key/value pairs of an associative container
QLEInteger	Platform-independent little-endian integers
QLatin1Char	8-bit ASCII/Latin-1 character
QLatin1String	The same as QLatin1StringView
QLatin1StringMatcher	Optimized search for substring in Latin-1 text
QLatin1StringView	Thin wrapper around a US-ASCII/Latin-1 encoded string literal
QLibrary	Loads shared libraries at runtime
QLibraryInfo	Information about the Qt library
QLine	Two-dimensional vector using integer precision
QLineF	Two-dimensional vector using floating point precision
QList	Template class that provides a dynamic array
QListIterator	Java-style const iterator for QList and QQueue
QLocale	Converts between numbers and their string representations in various languages
QLocationPermission	Access the user's location
QLockFile	Locking between processes using a file
QLoggingCategory	Represents a category, or 'area' in the logging infrastructure
QMap	Template class that provides an associative array
QMapIterator	Java-style const iterator for QMap
QMargins	Defines the four margins of a rectangle
QMarginsF	Defines the four margins of a rectangle
QMessageAuthenticationCode	Way to generate hash-based message authentication codes
QMessageLogContext	Additional information about a log message
QMessageLogger	Generates log messages
QMetaClassInfo	Additional information about a class
QMetaEnum	Meta-data about an enumerator
QMetaMethod	Meta-data about a member function
QMetaObject	Contains meta-information about Qt objects
QMetaObject::Connection
QMetaProperty	Meta-data about a property
QMetaSequence	Allows type erased access to sequential containers
QMetaType	Manages named types in the meta-object system
QMicrophonePermission	Access the microphone for monitoring or recording sound
QMilankovicCalendar	Milanković calendar system implementation
QMimeData	Container for data that records information about its MIME type
QMimeDatabase	Maintains a database of MIME types
QMimeType	Describes types of file or data, represented by a MIME type string
QModelIndex	Used to locate data in a data model
QModelRoleData	Holds a role and the data associated to that role
QModelRoleDataSpan	Span over QModelRoleData objects
QMultiHash	Convenience QHash subclass that provides multi-valued hashes
QMultiMap	Template class that provides an associative array with multiple equivalent keys
QMultiMap::key_iterator	QMultiMap::key_iterator class provides an STL-style const iterator for QMultiMap keys
QMultiMapIterator	Java-style const iterator for QMultiMap. QMultiMap has both Java-style iterators and STL-style iterators. STL-style iterators are more efficient and should be preferred
QMutableHashIterator	Java-style non-const iterator for QHash and QMultiHash
QMutableListIterator	Java-style non-const iterator for QList, QQueue and QStack
QMutableMapIterator	Java-style non-const iterator for QMap
QMutableMultiMapIterator	Java-style non-const iterator for QMultiMap
QMutableSetIterator	Java-style non-const iterator for QSet
QMutex	Access serialization between threads
QMutexLocker	Convenience class that simplifies locking and unlocking mutexes
QNativeInterface::QAndroidApplication	Native interface to a core application on Android
QObject	The base class of all Qt objects
QObjectBindableProperty	Template class that enables automatic property bindings for property data stored in QObject derived classes
QObjectCleanupHandler	Watches the lifetime of multiple QObjects
QObjectComputedProperty	Template class to help port old properties to the bindable property system
QOperatingSystemVersion	Information about the operating system version
QParallelAnimationGroup	Parallel group of animations
QPartialOrdering	Represents the result of a comparison that allows for unordered results
QPauseAnimation	Pause for QSequentialAnimationGroup
QPermission	An opaque wrapper of a typed permission
QPersistentModelIndex	Used to locate data in a data model
QPluginLoader	Loads a plugin at run-time
QPoint	Defines a point in the plane using integer precision
QPointF	Defines a point in the plane using floating point precision
QPointer	Template class that provides guarded pointers to QObject
QProcess	Used to start external programs and to communicate with them
QProcess::CreateProcessArguments
QProcessEnvironment	Holds the environment variables that can be passed to a program
QPromise	Way to store computation results to be accessed by QFuture
QProperty	Template class that enables automatic property bindings
QPropertyAnimation	Animates Qt properties
QPropertyBindingError
QPropertyChangeHandler	Controls the lifecycle of change callback installed on a QProperty
QPropertyData	Helper class for properties with automatic property bindings
QPropertyNotifier	Controls the lifecycle of change callback installed on a QProperty
QQueue	Generic container that provides a queue
QRandomGenerator	Allows one to obtain random values from a high-quality Random Number Generator
QRandomGenerator64	Allows one to obtain 64-bit random values from a high-quality, seed-less Random Number Generator
QReadLocker	Convenience class that simplifies locking and unlocking read-write locks for read access
QReadWriteLock	Read-write locking
QRect	Defines a rectangle in the plane using integer precision
QRectF	Defines a finite rectangle in the plane using floating point precision
QRecursiveMutex	Access serialization between threads
QRegularExpression	Pattern matching using regular expressions
QRegularExpressionMatch	The results of a matching a QRegularExpression against a string
QRegularExpressionMatchIterator	Iterator on the results of a global match of a QRegularExpression object against a string
QResource	Interface for reading directly from resources
QRomanCalendar	Shared base for calendars based on the ancient Roman calendar
QRunnable	The base class for all runnable objects
QSaveFile	Interface for safely writing to files
QScopeGuard	Provides a scope guard for calling a function at the end of a scope
QScopedArrayPointer	Stores a pointer to a dynamically allocated array of objects, and deletes it upon destruction
QScopedPointer	Stores a pointer to a dynamically allocated object, and deletes it upon destruction
QScopedValueRollback	Resets a variable to its previous value on destruction
QSemaphore	General counting semaphore
QSemaphoreReleaser	Exception-safe deferral of a QSemaphore::release() call
QSequentialAnimationGroup	Sequential group of animations
QSequentialIterable	Iterable interface for a container in a QVariant
QSet	Template class that provides a hash-table-based set
QSet::const_iterator	QSet::const_iterator class provides an STL-style const iterator for QSet
QSet::iterator	QSet::iterator class provides an STL-style non-const iterator for QSet
QSetIterator	Java-style const iterator for QSet
QSettings	Persistent platform-independent application settings
QSharedData	Base class for shared data objects
QSharedDataPointer	Represents a pointer to an implicitly shared object
QSharedMemory	Access to a shared memory segment
QSharedPointer	Holds a strong reference to a shared pointer
QSignalBlocker	Exception-safe wrapper around QObject::blockSignals()
QSignalMapper	Bundles signals from identifiable senders
QSize	Defines the size of a two-dimensional object using integer point precision
QSizeF	Defines the size of a two-dimensional object using floating point precision
QSocketNotifier	Support for monitoring activity on a file descriptor
QSortFilterProxyModel	Support for sorting and filtering data passed between another model and a view
QStack	Template class that provides a stack
QStandardPaths	Methods for accessing standard paths
QStaticByteArrayMatcher	Compile-time version of QByteArrayMatcher
QStaticPlugin	Struct containing a reference to a static plugin instance together with its meta data
QStorageInfo	Provides information about currently mounted storage and drives
QString	Unicode character string
QStringConverter	Base class for encoding and decoding text
QStringDecoder	State-based decoder for text
QStringEncoder	State-based encoder for text
QStringList	List of strings
QStringListModel	Model that supplies strings to views
QStringMatcher	Holds a sequence of characters that can be quickly matched in a Unicode string
QStringTokenizer	Splits strings into tokens along given separators
QStringView	Unified view on UTF-16 strings with a read-only subset of the QString API
QSysInfo	Information about the system
QSystemSemaphore	General counting system semaphore
QTaggedIterator	Template class that wraps an iterator and exposes standard iterator traits
QTemporaryDir	Creates a unique directory for temporary use
QTemporaryFile	I/O device that operates on temporary files
QTextBoundaryFinder	Way of finding Unicode text boundaries in a string
QTextStream	Convenient interface for reading and writing text
QThread	Platform-independent way to manage threads
QThreadPool	Manages a collection of QThreads
QThreadStorage	Per-thread data storage
QTime	Clock time functions
QTimeLine	Timeline for controlling animations
QTimeZone	Identifies how a time representation relates to UTC
QTimeZone::OffsetData
QTimer	Repetitive and single-shot timers
QTimerEvent	Contains parameters that describe a timer event
QTranslator	Internationalization support for text output
QTransposeProxyModel	This proxy transposes the source model
QTypeRevision	Contains a lightweight representation of a version number with two 8-bit segments, major and minor, either of which can be unknown
QUnhandledException	Represents an unhandled exception in a Qt Concurrent worker thread
QUntypedBindable	Uniform interface over bindable properties like QProperty\<T\> and QObjectBindableProperty of any type T
QUrl	Convenient interface for working with URLs
QUrlQuery	Way to manipulate a key-value pairs in a URL's query
QUtf8StringView	Unified view on UTF-8 strings with a read-only subset of the QString API
QUuid	Stores a Universally Unique Identifier (UUID)
QVarLengthArray	Low-level variable-length array
QVariant	Acts like a union for the most common Qt data types
QVariantAnimation	Base class for animations
QVariantConstPointer	Emulated const pointer to QVariant based on a pointer
QVariantPointer	Template class that emulates a pointer to QVariant based on a pointer
QVariantRef	Acts as a non-const reference to a QVariant
QVector	Alias for QList
QVersionNumber	Contains a version number with an arbitrary number of segments
QWaitCondition	Condition variable for synchronizing threads
QWeakPointer	Holds a weak reference to a shared pointer
QWinEventNotifier	Support for the Windows Wait functions
QWriteLocker	Convenience class that simplifies locking and unlocking read-write locks for write access
QXmlStreamAttribute	Represents a single XML attribute
QXmlStreamAttributes	Represents a vector of QXmlStreamAttribute
QXmlStreamEntityDeclaration	Represents a DTD entity declaration
QXmlStreamEntityResolver	Entity resolver for a QXmlStreamReader
QXmlStreamNamespaceDeclaration	Represents a namespace declaration
QXmlStreamNotationDeclaration	Represents a DTD notation declaration
QXmlStreamReader	Fast parser for reading well-formed XML via a simple streaming API
QXmlStreamWriter	XML writer with a simple streaming API
QtFuture::WhenAnyResult	QtFuture::WhenAnyResult is used to represent the result of QtFuture::whenAny()
qfloat16	Provides 16-bit floating point support

Detailed Description

All other Qt modules rely on this module.

The Qt Core page contains information about how to use the module.

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