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