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# Non-GUI Classes

The non-GUI classes are general-purpose collection and string classes that may be used independently of the GUI classes.

In particular, these classes do not depend on QApplication at all, and so can be used in non-GUI programs.

QBitArray | Array of bits
QByteArray | Array of bytes
QByteArrayMatcher | Holds a sequence of bytes that can be quickly matched in a byte array
QCache | Template class that provides a cache
QCryptographicHash | Way to generate cryptographic hashes
QFlags | Type-safe way of storing OR-combinations of enum values
QHash | Template class that provides a hash-table-based dictionary
QLinkedList | Template class that provides linked lists
QList | Template class that provides lists
QMap | Template class that provides a skip-list-based dictionary
QMultiHash | Convenience QHash subclass that provides multi-valued hashes
QMultiMap | Convenience QMap subclass that provides multi-valued maps
QPair | Template class that stores a pair of items
QQueue | Generic container that provides a queue
QRegExp | Pattern matching using regular expressions
QSet | Template class that provides a hash-table-based set
QStack | Template class that provides a stack
QString | Unicode character string
QStringList | List of strings
QStringMatcher | Holds a sequence of characters that can be quickly matched in a Unicode string
QStringRef | Thin wrapper around QString substrings
QVarLengthArray | Low-level variable-length array
QVector | Template class that provides a dynamic array