QMutableHashIterator Class

QHash<int, QWidget *> hash;
...
QMutableHashIterator<QString, QWidget *> i(hash);
while (i.hasNext()) {
    i.next();
    qDebug() << i.key() << ": " << i.value();
}

QMutableHashIterator<int, QWidget *> i(hash);
i.toBack();
while (i.hasPrevious()) {
    i.previous();
    qDebug() << i.key() << ": " << i.value();
}

QMutableHashIterator<int, QWidget *> i(hash);
while (i.findNext(widget)) {
    qDebug() << "Found widget " << widget << " under key "
             << i.key();
}

QMutableHashIterator<QString, QString> i(hash);
while (i.hasNext()) {
    i.next();
    if (i.key() == i.value())
        i.remove();
}

Member Function Documentation

void QMutableHashIterator::setValue(const T &value)

Replaces the value of the last item that was jumped over using one of the traversal functions with value.

The traversal functions are next(), previous(), findNext(), and findPrevious().

See also key(), value(), and remove().

void QMutableHashIterator::remove()

Removes the last item that was jumped over using one of the traversal functions (next(), previous(), findNext(), findPrevious()).

See also setValue().

bool QMutableHashIterator::findPrevious(const T &value)

Searches for value starting from the current iterator position backward. Returns true if a (key, value) pair with value value is found; otherwise returns false.

After the call, if value was found, the iterator is positioned just before the matching item; otherwise, the iterator is positioned at the front of the container.

See also findNext().

bool QMutableHashIterator::findNext(const T &value)

Searches for value starting from the current iterator position forward. Returns true if a (key, value) pair with value value is found; otherwise returns false.

After the call, if value was found, the iterator is positioned just after the matching item; otherwise, the iterator is positioned at the back of the container.

See also findPrevious().

const Key &QMutableHashIterator::key() const

Returns the key of the last item that was jumped over using one of the traversal functions (next(), previous(), findNext(), findPrevious()).

After a call to next() or findNext(), key() is equivalent to peekPrevious().key(). After a call to previous() or findPrevious(), key() is equivalent to peekNext().key().

See also value().

T &QMutableHashIterator::value()

This is an overloaded function.

Returns a non-const reference to the value of the last item that was jumped over using one of the traversal functions.

const T &QMutableHashIterator::value() const

Returns the value of the last item that was jumped over using one of the traversal functions (next(), previous(), findNext(), findPrevious()).

After a call to next() or findNext(), value() is equivalent to peekPrevious().value(). After a call to previous() or findPrevious(), value() is equivalent to peekNext().value().

See also key() and setValue().

QMutableHashIterator::Item QMutableHashIterator::peekPrevious() const

Returns the previous item without moving the iterator.

Call key() on the return value to obtain the item's key, and value() to obtain the value.

Calling this function on an iterator located at the front of the container leads to undefined results.

See also hasPrevious(), previous(), and peekNext().

QMutableHashIterator::Item QMutableHashIterator::previous()

Returns the previous item and moves the iterator back by one position.

Call key() on the return value to obtain the item's key, and value() to obtain the value.

Calling this function on an iterator located at the front of the container leads to undefined results.

See also hasPrevious(), peekPrevious(), and next().

bool QMutableHashIterator::hasPrevious() const

Returns true if there is at least one item behind the iterator, i.e. the iterator is not at the front of the container; otherwise returns false.

See also hasNext() and previous().

QMutableHashIterator::Item QMutableHashIterator::peekNext() const

Returns a reference to the next item without moving the iterator.

Call key() on the return value to obtain the item's key, and value() to obtain the value.

Calling this function on an iterator located at the back of the container leads to undefined results.

See also hasNext(), next(), and peekPrevious().

QMutableHashIterator::Item QMutableHashIterator::next()

Returns the next item and advances the iterator by one position.

Call key() on the return value to obtain the item's key, and value() to obtain the value.

Calling this function on an iterator located at the back of the container leads to undefined results.

See also hasNext(), peekNext(), and previous().

bool QMutableHashIterator::hasNext() const

Returns true if there is at least one item ahead of the iterator, i.e. the iterator is not at the back of the container; otherwise returns false.

See also hasPrevious() and next().

void QMutableHashIterator::toBack()

Moves the iterator to the back of the container (after the last item).

See also toFront() and previous().

void QMutableHashIterator::toFront()

Moves the iterator to the front of the container (before the first item).

See also toBack() and next().

QMutableHashIterator<Key, T> &QMutableHashIterator::operator=(QHash<Key, T> &container)

Makes the iterator operate on hash. The iterator is set to be at the front of the hash (before the first item).

See also toFront() and toBack().

QMutableHashIterator::QMutableHashIterator(QHash<Key, T> &hash)

Constructs an iterator for traversing hash. The iterator is set to be at the front of the hash (before the first item).

See also operator=().