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Diffstat (limited to 'src/corelib/doc/src/containers.qdoc')
| -rw-r--r-- | src/corelib/doc/src/containers.qdoc | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/corelib/doc/src/containers.qdoc b/src/corelib/doc/src/containers.qdoc index ff2df9c020..fa26409d83 100644 --- a/src/corelib/doc/src/containers.qdoc +++ b/src/corelib/doc/src/containers.qdoc @@ -533,10 +533,18 @@ This problem doesn't occur with functions that return a const or non-const reference to a container. + \section3 Implicit sharing iterator problem + \l{Implicit sharing} has another consequence on STL-style - iterators: You must not take a copy of a container while - non-const iterators are active on that container. Java-style - iterators don't suffer from that limitation. + iterators: you should avoid copying a container while + iterators are active on that container. The iterators + point to an internal structure, and if you copy a container + you should be very careful with your iterators. E.g: + + \snippet code/doc_src_containers.cpp 24 + + The above example only shows a problem with QVector, but + the problem exists for all the implicitly shared Qt containers. \keyword foreach \section1 The foreach Keyword |