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