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| author | Kai Köhne <kai.koehne@qt.io> | 2021-06-14 15:43:27 +0200 |
|---|---|---|
| committer | Qt Cherry-pick Bot <cherrypick_bot@qt-project.org> | 2021-06-21 08:36:57 +0000 |
| commit | 7be133d0f5b85ad87313bdb48e50aa1fdc76efd1 (patch) | |
| tree | 2f70330c83ae072477d75f674439cac8ca35024d /src | |
| parent | c7115a50a75155f60ccf595ee10c76fc814e9051 (diff) | |
Porting Guide: Mention that also QSet is affected by stability of references
QSet is internally implemented by a QHash. Therefore the change in
reference stability affects QSet, too.
Change-Id: If1879d5a027211bca0beeff16ffbc77f2f4fce26
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
(cherry picked from commit c2c15666b76516e5edfbe2a51226740b5a0bb4d3)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/corelib/doc/src/qt6-changes.qdoc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/corelib/doc/src/qt6-changes.qdoc b/src/corelib/doc/src/qt6-changes.qdoc index 8b8a330d03..11763a58cb 100644 --- a/src/corelib/doc/src/qt6-changes.qdoc +++ b/src/corelib/doc/src/qt6-changes.qdoc @@ -70,12 +70,12 @@ \section3 Stability of References - The implementation of QHash and QMultiHash in Qt 6 got changed from + The implementation of QHash, QMultiHash and QSet in Qt 6 got changed from a node based approach to a two stage lookup table. This design allows to keep the memory overhead of a hash instance very small, while at the same time giving good performance. - One behavioral change to note is that the new QHash implementation + One behavioral change to note is that the new implementation will not provide stable references to elements in the hash when the table needs to grow, or when entries are removed. Applications that rely on such stability might now run into undefined behavior. |