const_iterator Class
Class const_iterator is declared in class QJsonArray.The QJsonArray::const_iterator class provides an STL-style const iterator for QJsonArray. More...
Public Types
typedef | iterator_category |
Detailed Description
QJsonArray::const_iterator allows you to iterate over a QJsonArray. If you want to modify the QJsonArray as you iterate over it, use QJsonArray::iterator instead. It is generally a good practice to use QJsonArray::const_iterator on a non-const QJsonArray as well, unless you need to change the QJsonArray through the iterator. Const iterators are slightly faster and improves code readability.
The default QJsonArray::const_iterator constructor creates an uninitialized iterator. You must initialize it using a QJsonArray function like QJsonArray::constBegin(), QJsonArray::constEnd(), or QJsonArray::insert() before you can start iterating.
Most QJsonArray functions accept an integer index rather than an iterator. For that reason, iterators are rarely useful in connection with QJsonArray. One place where STL-style iterators do make sense is as arguments to generic algorithms.
Multiple iterators can be used on the same array. However, be aware that any non-const function call performed on the QJsonArray will render all existing iterators undefined.
See also QJsonArray::iterator.