- This enum type defines what happens to the aspect ratio when scaling an rectangle. 
- This enum describes the types of connection that can be used with signals. 
- The QByteArray class provides an array of bytes. 
- The QColor class provides colors based on RGB, HSL, HSV or CMYK values. 
- The QDate class provides date functions. 
- The QDateTime class provides date and time functions. 
- The QHash class is a template class that provides a hash-table-based dictionary. 
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⚠ Warning: The QImage API in CXX-Qt-lib is not yet complete and subject to change. 
- The QList class is a template class that provides a dynamic array. 
- The QMap class is a template class that provides an associative array. 
- The QMargins class defines the four margins of a rectangle. 
- The QMarginsF class defines the four margins of a rectangle. 
- Represents a handle to a signal-slot (or signal-functor) connection. 
- The QModelIndex class is used to locate data in a data model. 
- The QPersistentModelIndex class is used to locate data in a data model. 
- The QPoint struct defines a point in the plane using integer precision. 
- The QPointF struct defines a point in the plane using floating point precision. 
- The QRect struct defines a rectangle in the plane using integer precision. 
- The QRectF struct defines a rectangle in the plane using floating point precision. 
- The QSet class is a template class that provides a hash-table-based set. 
- The QSize struct defines the size of a two-dimensional object using integer point precision. 
- The QSizeF class defines the size of a two-dimensional object using floating point precision. 
- The QString class provides a Unicode character string. 
- The QStringList class provides a list of strings. 
- The QTime class provides clock time functions. 
- The QTimeZone class converts between UTC and local time in a specific time zone. 
- The QUrl class provides a convenient interface for working with URLs. 
- The QVariant class acts like a union for the most common Qt data types. 
- The QVector class is a template class that provides a dynamic array. 
- The QVector2D class represents a vector or vertex in 2D space. 
- The QVector3D class represents a vector or vertex in 3D space. 
- The QVector4D class represents a vector or vertex in 4D space.