Qlist

Qlist, commonly written as QList in Qt documentation, is a generic container class in the Qt framework. It stores a list of elements of a given type and provides random access, dynamic resizing, and a rich set of manipulation operations. As part of the QtCore module, QList is used to hold items in a simple, indexable sequence, suitable for temporary collections, model data, or UI item lists. The class supports copy-on-write semantics to optimize efficiency when lists are passed by value.

The API includes standard accessors and mutators: size() or isEmpty(), at(int) and operator[] for element access, first() and last(), and iterator support through begin() and end(). Elements can be added with append(), prepend(), and insert(int, const T&); removal can be performed with removeAt(int), removeOne(const T&), removeAll(const T&), and clear(). Other helpers include indexOf(const T&), lastIndexOf(const T&), and contains(const T&).

Performance and usage notes: QList is designed for typical list-like workloads and integrates with Qt's implicit sharing to minimize copies. For modern Qt development, QVector is often recommended for value types or performance-critical code, while QList remains convenient for legacy code and for types that benefit from its API. Qt documentation and examples continue to use QList for compatibility, though its internal implementation has evolved across Qt versions.