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# Miscellaneous Classes

These classes are useful classes not fitting into any other category.

QCoreSettings | Persistent platform-independent application settings
QCoreVariant | Acts like a union for the most common Qt data types
QDoubleValidator | Range checking of floating-point numbers
QErrorMessage | Error message display dialog
QExplicitlySharedDataPointer | Internal class supporting shared data objects
QIntValidator | Validator that ensures a string contains a valid integer within a specified range
QKeySequence | Encapsulates a key sequence as used by shortcuts
QMacMime | Maps open-standard MIME to Mac flavors
QMimeSource | Abstraction of objects which provide formatted data of a certain MIME type
QProcess | Used to start external programs and to communicate with them
QRegExp | Pattern matching using regular expressions
QRegExpValidator | Used to check a string against a regular expression
QRubberBand | Rectangle or line that can indicate a selection or a boundary
QSettings | Persistent platform-indendent GUI application settings
QSharedData | Base class for shared data objects
QSharedDataPointer | Pointer to a shared data object
QSignal | Can be used to send signals for classes that do not inherit QObject
QSplashScreen | Splash screen that can be shown during application startup
QUrl | Convenient interface for working with URLs
QUrlInfo | Stores information about URLs
QUuid | Defines a Universally Unique Identifier (UUID)
QValidator | Validation of input text
QVariant | Acts like a union for the most common Qt data types
QWindowsMime | Maps open-standard MIME to Window Clipboard formats
Qt