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# Implicitly and Explicitly Shared Classes

These classes are normally-heavy classes which in Qt have been optimized by the use of reference counter and common data so they can be passed around.

The only important effect is that the classes listed here can be passed around as arguments efficiently, even though they may seem heavyweight.

QBitArray | Array of bits
QBitmap | Monochrome (1-bit depth) pixmaps
QBrush | Defines the fill pattern of shapes drawn by a QPainter
QCString | Abstraction of the classic C zero-terminated char array (char *)
QCursor | Mouse cursor with an arbitrary shape
QFont | Font used for drawing text
QFontInfo | General information about fonts
QFontMetrics | Font metrics information
QIconSet | Set of icons with different styles and sizes
QImage | Hardware-independent pixmap representation with direct access to the pixel data
QMap | Value-based template class that provides a dictionary
QPair | Value-based template class that provides a pair of elements
QPalette | Color groups for each widget state
QPen | Defines how a QPainter should draw lines and outlines of shapes
QPicture | Paint device that records and replays QPainter commands
QPixmap | Off-screen, pixel-based paint device
QPointArray | Array of points
QRegExp | Pattern matching using regular expressions
QString | Abstraction of Unicode text and the classic C null-terminated char array
QStringList | List of strings
QValueList | Value-based template class that provides doubly linked lists
QValueStack | Value-based template class that provides a stack
QValueVector | Value-based template class that provides a dynamic array