diff options
Diffstat (limited to 'doc/src/frameworks-technologies')
| -rw-r--r-- | doc/src/frameworks-technologies/containers.qdoc | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/src/frameworks-technologies/containers.qdoc b/doc/src/frameworks-technologies/containers.qdoc index 86920fd..505b65c 100644 --- a/doc/src/frameworks-technologies/containers.qdoc +++ b/doc/src/frameworks-technologies/containers.qdoc @@ -612,11 +612,14 @@ Qt automatically takes a copy of the container when it enters a \c foreach loop. If you modify the container as you are - iterating, that won't affect the loop. (If you don't modify the + iterating, that won't affect the loop. (If you do not modify the container, the copy still takes place, but thanks to \l{implicit - sharing} copying a container is very fast.) Similarly, declaring - the variable to be a non-const reference, in order to modify the - current item in the list will not work either. + sharing} copying a container is very fast.) + + Since foreach creates a copy of the container, using a non-const + reference for the variable does not allow you to modify the original + container. It only affects the copy, which is probably not what you + want. In addition to \c foreach, Qt also provides a \c forever pseudo-keyword for infinite loops: |