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The Converter class, in the eponymous example, had a null member variable that wasn't a nullptr - it pointed to an instance of NullConverter - so that other converters could test whether a Converter * they'd been passed was null (in the sense of pointing to a NullConverter). This, however, was susceptible to misreading - I misread one such comparison as a nullptr check and thus thought it redundant with an earlier actual nullptr check. To spare future readers similar confusion, replace the public static member variable with a protected (since only other derived classes need it) static predicate, to at least give the reader a clue that this is using the word null in a class-specific sense. Pick-to: 6.5 Task-number: QTBUG-111228 Change-Id: I1e4f494b303d1bf90107f8c6fa3a4a22f6d81b90 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> (cherry picked from commit 0b1670134b43ba390f35b52d2458e4269a804de3) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
Qt is supplied with a number of example applications that have been written to provide developers with examples of the Qt API in use, highlight good programming practice, and showcase features found in each of Qt's core technologies. Documentation for examples can be found in the Examples section of the Qt documentation.