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| author | Kai Koehne <kai.koehne@theqtcompany.com> | 2015-06-26 16:57:32 +0200 |
|---|---|---|
| committer | Kai Koehne <kai.koehne@theqtcompany.com> | 2015-07-01 12:13:28 +0000 |
| commit | 04b9f865619770770899ba228b7b6503d990e2f1 (patch) | |
| tree | 5ee6dfc11ecfaa28843972642463219584a953f6 /src/corelib/doc | |
| parent | 5a3fe3e97aa6cae4c5db54b7b2958b82a94310c4 (diff) | |
Doc: Give advice on foreach vs range-based for
Task-number: QTBUG-41636
Change-Id: I28c1424e7f4c1c4da596bcae66283b60f471a8ee
Reviewed-by: Martin Smith <martin.smith@digia.com>
Diffstat (limited to 'src/corelib/doc')
| -rw-r--r-- | src/corelib/doc/src/containers.qdoc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/corelib/doc/src/containers.qdoc b/src/corelib/doc/src/containers.qdoc index 1979c45e17..f8d0d3eb05 100644 --- a/src/corelib/doc/src/containers.qdoc +++ b/src/corelib/doc/src/containers.qdoc @@ -601,6 +601,13 @@ container. It only affects the copy, which is probably not what you want. + An alternative to Qt's \c foreach loop is the range-based \c for that is + part of C++ 11 and newer. However, keep in mind that the range-based + \c for might force a Qt container to \l{Implicit Sharing}{detach}, whereas + \c foreach would not. But using \c foreach always copies the container, + which is usually not cheap for STL containers. If in doubt, prefer + \c foreach for Qt containers, and range based \c for for STL ones. + In addition to \c foreach, Qt also provides a \c forever pseudo-keyword for infinite loops: |