qmapiterator

QMapIterator is a class in Qt that provides a way to iterate through the key-value pairs of a QMap container. It allows you to access the keys and values of a QMap in a sequential manner, making it easy to perform operations on each element of the container.

To use QMapIterator, you first need to create a QMap container and populate it with key-value pairs. You can then create an instance of QMapIterator and initialize it with the QMap container. You can then use the hasNext() method to check if there are more elements to iterate through, and the next() method to get the next key-value pair.

Here is an example of using QMapIterator to iterate through a QMap container:

QMap<QString, int> map;
map.insert("A", 1);
map.insert("B", 2);
map.insert("C", 3);

QMapIterator<QString, int> i(map);
while (i.hasNext()) {
    i.next();
    qDebug() << i.key() << ": " << i.value();
}

This code creates a QMap container with three key-value pairs, and then creates a QMapIterator instance to iterate through the container. The while loop uses the hasNext() method to check if there are more elements to iterate through, and the next() method to get the next key-value pair. The key() and value() methods are used to access the key and value of each element. The output of this code will be:

"A": 1
"B": 2
"C": 3