path: root/src/corelib/tools/qiterator.qdoc

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/*! 
    \class QListIterator
    \inmodule QtCore

    \brief The QListIterator class provides a Java-style const iterator for QList and QQueue.

    QList has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    An alternative to using iterators is to use index positions. Most
    QList member functions take an index as their first parameter,
    making it possible to access, modify, and remove items without
    using iterators.

    QListIterator\<T\> allows you to iterate over a QList\<T\> (or a
    QQueue\<T\>). If you want to modify the list as you iterate over
    it, use QMutableListIterator\<T\> instead.

    The QListIterator constructor takes a QList as argument. After
    construction, the iterator is located at the very beginning of
    the list (before the first item). Here's how to iterate over all
    the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 0

    The next() function returns the next item in the list and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, and returns the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 1

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    Multiple iterators can be used on the same list. If the list is
    modified while a QListIterator is active, the QListIterator will
    continue iterating over the original list, ignoring the modified
    copy.

    \sa QMutableListIterator, QList::const_iterator
*/

/*! 
    \class QLinkedListIterator
    \inmodule QtCore

    \brief The QLinkedListIterator class provides a Java-style const iterator for QLinkedList.

    QLinkedList has both \l{Java-style iterators} and
    \l{STL-style iterators}. The Java-style iterators are more
    high-level and easier to use than the STL-style iterators; on the
    other hand, they are slightly less efficient.

    QLinkedListIterator\<T\> allows you to iterate over a
    QLinkedList\<T\>. If you want to modify the list as you iterate
    over it, use QMutableLinkedListIterator\<T\> instead.

    The QLinkedListIterator constructor takes a QLinkedList as
    argument. After construction, the iterator is located at the very
    beginning of the list (before the first item). Here's how to
    iterate over all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 2

    The next() function returns the next item in the list and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, and returns the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 3

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    Multiple iterators can be used on the same list. If the list is
    modified while a QLinkedListIterator is active, the
    QLinkedListIterator will continue iterating over the original
    list, ignoring the modified copy.

    \sa QMutableLinkedListIterator, QLinkedList::const_iterator
*/

/*! 
    \class QVectorIterator
    \inmodule QtCore
    \brief The QVectorIterator class provides a Java-style const iterator for QVector and QStack.

    QVector has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    An alternative to using iterators is to use index positions. Most
    QVector member functions take an index as their first parameter,
    making it possible to access, insert, and remove items without
    using iterators.

    QVectorIterator\<T\> allows you to iterate over a QVector\<T\>
    (or a QStack\<T\>). If you want to modify the vector as you
    iterate over it, use QMutableVectorIterator\<T\> instead.

    The QVectorIterator constructor takes a QVector as argument.
    After construction, the iterator is located at the very beginning
    of the vector (before the first item). Here's how to iterate over
    all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 4

    The next() function returns the next item in the vector and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, returning the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 5

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    Multiple iterators can be used on the same vector. If the vector
    is modified while a QVectorIterator is active, the QVectorIterator
    will continue iterating over the original vector, ignoring the
    modified copy.

    \sa QMutableVectorIterator, QVector::const_iterator
*/

/*! 
    \class QSetIterator
    \inmodule QtCore
    \brief The QSetIterator class provides a Java-style const iterator for QSet.

    QSet supports both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    QSetIterator\<T\> allows you to iterate over a QSet\<T\>. If you
    want to modify the set as you iterate over it, use
    QMutableSetIterator\<T\> instead.

    The constructor takes a QSet as argument. After construction, the
    iterator is located at the very beginning of the set (before
    the first item). Here's how to iterate over all the elements
    sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 6

    The next() function returns the next item in the set and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, returning the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 7

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    Multiple iterators can be used on the same set. If the set
    is modified while a QSetIterator is active, the QSetIterator
    will continue iterating over the original set, ignoring the
    modified copy.

    \sa QMutableSetIterator, QSet::const_iterator
*/

/*! 
    \class QMutableListIterator
    \inmodule QtCore

    \brief The QMutableListIterator class provides a Java-style non-const iterator for QList and QQueue.

    QList has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    An alternative to using iterators is to use index positions. Most
    QList member functions take an index as their first parameter,
    making it possible to access, insert, and remove items without
    using iterators.

    QMutableListIterator\<T\> allows you to iterate over a QList\<T\>
    (or a QQueue\<T\>) and modify the list. If you don't want to
    modify the list (or have a const QList), use the slightly faster
    QListIterator\<T\> instead.

    The QMutableListIterator constructor takes a QList as argument.
    After construction, the iterator is located at the very beginning
    of the list (before the first item). Here's how to iterate over
    all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 8

    The next() function returns the next item in the list and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, returning the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 9

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    If you want to remove items as you iterate over the list, use
    remove(). If you want to modify the value of an item, use
    setValue(). If you want to insert a new item in the list, use
    insert().

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 10

    The example traverses a list, replacing negative numbers with
    their absolute values, and eliminating zeroes.

    Only one mutable iterator can be active on a given list at any
    time. Furthermore, no changes should be done directly to the list
    while the iterator is active (as opposed to through the
    iterator), since this could invalidate the iterator and lead to
    undefined behavior.

    \sa QListIterator, QList::iterator
*/

/*! 
    \class QMutableLinkedListIterator
    \inmodule QtCore

    \brief The QMutableLinkedListIterator class provides a Java-style non-const iterator for QLinkedList.

    QLinkedList has both \l{Java-style iterators} and
    \l{STL-style iterators}. The Java-style iterators are more
    high-level and easier to use than the STL-style iterators; on the
    other hand, they are slightly less efficient.

    QMutableLinkedListIterator\<T\> allows you to iterate over a
    QLinkedList\<T\> and modify the list. If you don't want to modify
    the list (or have a const QLinkedList), use the slightly faster
    QLinkedListIterator\<T\> instead.

    The QMutableLinkedListIterator constructor takes a QLinkedList as
    argument. After construction, the iterator is located at the very
    beginning of the list (before the first item). Here's how to
    iterate over all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 11

    The next() function returns the next item in the list and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, returning the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 12

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    If you want to remove items as you iterate over the list, use
    remove(). If you want to modify the value of an item, use
    setValue(). If you want to insert a new item in the list, use
    insert().

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 13

    The example traverses a list, replacing negative numbers with
    their absolute values, and eliminating zeroes.

    Only one mutable iterator can be active on a given list at any
    time. Furthermore, no changes should be done directly to the list
    while the iterator is active (as opposed to through the
    iterator), since this could invalidate the iterator and lead to
    undefined behavior.

    \sa QLinkedListIterator, QLinkedList::iterator
*/

/*! 
    \class QMutableVectorIterator
    \inmodule QtCore

    \brief The QMutableVectorIterator class provides a Java-style non-const iterator for QVector and QStack.

    QVector has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    An alternative to using iterators is to use index positions. Most
    QVector member functions take an index as their first parameter,
    making it possible to access, insert, and remove items without
    using iterators.

    QMutableVectorIterator\<T\> allows you to iterate over a
    QVector\<T\> and modify the vector. If you don't want to modify
    the vector (or have a const QVector), use the slightly faster
    QVectorIterator\<T\> instead.

    The QMutableVectorIterator constructor takes a QVector as
    argument. After construction, the iterator is located at the very
    beginning of the list (before the first item). Here's how to
    iterate over all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 14

    The next() function returns the next item in the vector and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, returning the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 15

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop.

    If you want to remove items as you iterate over the vector, use
    remove(). If you want to modify the value of an item, use
    setValue(). If you want to insert a new item in the vector, use
    insert().

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 16

    The example traverses a vector, replacing negative numbers with
    their absolute values, and eliminating zeroes.

    Only one mutable iterator can be active on a given vector at any
    time. Furthermore, no changes should be done directly to the
    vector while the iterator is active (as opposed to through the
    iterator), since this could invalidate the iterator and lead to
    undefined behavior.

    \sa QVectorIterator, QVector::iterator
*/

/*! 
    \class QMutableSetIterator
    \inmodule QtCore
    \since 4.2

    \brief The QMutableSetIterator class provides a Java-style non-const iterator for QSet.

    QSet has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    QMutableSetIterator\<T\> allows you to iterate over a QSet\<T\>
    and remove items from the set as you iterate. If you don't want
    to modify the set (or have a const QSet), use the slightly faster
    QSetIterator\<T\> instead.

    The QMutableSetIterator constructor takes a QSet as argument.
    After construction, the iterator is located at the very beginning
    of the set (before the first item). Here's how to iterate over
    all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 17

    The next() function returns the next item in the set and
    advances the iterator. Unlike STL-style iterators, Java-style
    iterators point \e between items rather than directly \e at
    items. The first call to next() advances the iterator to the
    position between the first and second item, and returns the first
    item; the second call to next() advances the iterator to the
    position between the second and third item, returning the second
    item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 18

    If you want to remove items as you iterate over the set, use
    remove().

    Only one mutable iterator can be active on a given set at any
    time. Furthermore, no changes should be done directly to the set
    while the iterator is active (as opposed to through the
    iterator), since this could invalidate the iterator and lead to
    undefined behavior.

    \sa QSetIterator, QSet::iterator
*/

/*!
    \fn QListIterator::QListIterator(const QList<T> &list)
    \fn QLinkedListIterator::QLinkedListIterator(const QLinkedList<T> &list)
    \fn QMutableListIterator::QMutableListIterator(QList<T> &list)
    \fn QMutableLinkedListIterator::QMutableLinkedListIterator(QLinkedList<T> &list)

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

    \sa operator=()
*/

/*!
    \fn QVectorIterator::QVectorIterator(const QVector<T> &vector)
    \fn QMutableVectorIterator::QMutableVectorIterator(QVector<T> &vector)

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

    \sa operator=()
*/

/*!
    \fn QSetIterator::QSetIterator(const QSet<T> &set)
    \fn QMutableSetIterator::QMutableSetIterator(QSet<T> &set)

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

    \sa operator=()
*/

/*!
    \fn QMutableListIterator::~QMutableListIterator()
    \fn QMutableLinkedListIterator::~QMutableLinkedListIterator()
    \fn QMutableVectorIterator::~QMutableVectorIterator()
    \fn QMutableSetIterator::~QMutableSetIterator()

    Destroys the iterator.

    \sa operator=()
*/

/*! \fn QMutableListIterator &QMutableListIterator::operator=(QList<T> &list)
    \fn QMutableLinkedListIterator &QMutableLinkedListIterator::operator=(QLinkedList<T> &list)
    \fn QListIterator &QListIterator::operator=(const QList<T> &list)
    \fn QLinkedListIterator &QLinkedListIterator::operator=(const QLinkedList<T> &list)

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

    \sa toFront(), toBack()
*/

/*! \fn QVectorIterator &QVectorIterator::operator=(const QVector<T> &vector)
    \fn QMutableVectorIterator &QMutableVectorIterator::operator=(QVector<T> &vector)

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

    \sa toFront(), toBack()
*/

/*! \fn QSetIterator &QSetIterator::operator=(const QSet<T> &set)
    \fn QMutableSetIterator &QMutableSetIterator::operator=(QSet<T> &set)

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

    \sa toFront(), toBack()
*/

/*! \fn void QListIterator::toFront()
    \fn void QLinkedListIterator::toFront()
    \fn void QVectorIterator::toFront()
    \fn void QSetIterator::toFront()
    \fn void QMutableListIterator::toFront()
    \fn void QMutableLinkedListIterator::toFront()
    \fn void QMutableVectorIterator::toFront()
    \fn void QMutableSetIterator::toFront()

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

    \sa toBack(), next()
*/

/*! \fn void QListIterator::toBack()
    \fn void QLinkedListIterator::toBack()
    \fn void QVectorIterator::toBack()
    \fn void QSetIterator::toBack()
    \fn void QMutableListIterator::toBack()
    \fn void QMutableLinkedListIterator::toBack()
    \fn void QMutableVectorIterator::toBack()
    \fn void QMutableSetIterator::toBack()

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

    \sa toFront(), previous()
*/

/*! \fn bool QListIterator::hasNext() const
    \fn bool QLinkedListIterator::hasNext() const
    \fn bool QVectorIterator::hasNext() const
    \fn bool QSetIterator::hasNext() const
    \fn bool QMutableListIterator::hasNext() const
    \fn bool QMutableLinkedListIterator::hasNext() const
    \fn bool QMutableVectorIterator::hasNext() const
    \fn bool QMutableSetIterator::hasNext() const

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

    \sa hasPrevious(), next()
*/

/*! \fn const T &QListIterator::next()
    \fn const T &QLinkedListIterator::next()
    \fn const T &QVectorIterator::next()
    \fn const T &QSetIterator::next()
    \fn const T &QMutableSetIterator::next()

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

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

    \sa hasNext(), peekNext(), previous()
*/

/*! \fn T &QMutableListIterator::next()
    \fn T &QMutableLinkedListIterator::next()
    \fn T &QMutableVectorIterator::next()

    Returns a reference to the next item, and advances the iterator
    by one position.

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

    \sa hasNext(), peekNext(), previous()
*/

/*! \fn const T &QListIterator::peekNext() const
    \fn const T &QLinkedListIterator::peekNext() const
    \fn const T &QVectorIterator::peekNext() const
    \fn const T &QSetIterator::peekNext() const
    \fn const T &QMutableSetIterator::peekNext() const

    Returns the next item without moving the iterator.

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

    \sa hasNext(), next(), peekPrevious()
*/

/*! \fn T &QMutableListIterator::peekNext() const
    \fn T &QMutableLinkedListIterator::peekNext() const
    \fn T &QMutableVectorIterator::peekNext() const

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

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

    \sa hasNext(), next(), peekPrevious()
*/

/*! \fn bool QListIterator::hasPrevious() const
    \fn bool QLinkedListIterator::hasPrevious() const
    \fn bool QVectorIterator::hasPrevious() const
    \fn bool QSetIterator::hasPrevious() const
    \fn bool QMutableListIterator::hasPrevious() const
    \fn bool QMutableLinkedListIterator::hasPrevious() const
    \fn bool QMutableVectorIterator::hasPrevious() const
    \fn bool QMutableSetIterator::hasPrevious() const

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

    \sa hasNext(), previous()
*/

/*! \fn const T &QListIterator::previous()
    \fn const T &QLinkedListIterator::previous()
    \fn const T &QVectorIterator::previous()
    \fn const T &QSetIterator::previous()
    \fn const T &QMutableSetIterator::previous()

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

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

    \sa hasPrevious(), peekPrevious(), next()
*/

/*! \fn T &QMutableListIterator::previous()
    \fn T &QMutableLinkedListIterator::previous()
    \fn T &QMutableVectorIterator::previous()

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

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

    \sa hasPrevious(), peekPrevious(), next()
*/

/*! \fn const T &QListIterator::peekPrevious() const
    \fn const T &QLinkedListIterator::peekPrevious() const
    \fn const T &QVectorIterator::peekPrevious() const
    \fn const T &QSetIterator::peekPrevious() const
    \fn const T &QMutableSetIterator::peekPrevious() const

    Returns the previous item without moving the iterator.

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

    \sa hasPrevious(), previous(), peekNext()
*/

/*! \fn T &QMutableListIterator::peekPrevious() const
    \fn T &QMutableLinkedListIterator::peekPrevious() const
    \fn T &QMutableVectorIterator::peekPrevious() const

    Returns a reference to the previous item, without moving the iterator.

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

    \sa hasPrevious(), previous(), peekNext()
*/

/*! \fn bool QListIterator::findNext(const T &value)
    \fn bool QLinkedListIterator::findNext(const T &value)
    \fn bool QVectorIterator::findNext(const T &value)
    \fn bool QSetIterator::findNext(const T &value)
    \fn bool QMutableListIterator::findNext(const T &value)
    \fn bool QMutableLinkedListIterator::findNext(const T &value)
    \fn bool QMutableVectorIterator::findNext(const T &value)
    \fn bool QMutableSetIterator::findNext(const T &value)

    Searches for \a value starting from the current iterator position
    forward. Returns true if \a value is found; otherwise returns false.

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

    \sa findPrevious()
*/

/*! \fn bool QListIterator::findPrevious(const T &value)
    \fn bool QLinkedListIterator::findPrevious(const T &value)
    \fn bool QVectorIterator::findPrevious(const T &value)
    \fn bool QSetIterator::findPrevious(const T &value)
    \fn bool QMutableListIterator::findPrevious(const T &value)
    \fn bool QMutableLinkedListIterator::findPrevious(const T &value)
    \fn bool QMutableVectorIterator::findPrevious(const T &value)
    \fn bool QMutableSetIterator::findPrevious(const T &value)

    Searches for \a value starting from the current iterator position
    backward. Returns true if \a value is found; otherwise returns
    false.

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

    \sa findNext()
*/

/*! \fn void QMutableListIterator::remove()

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 19

    \sa insert(), setValue()
*/

/*! \fn void QMutableLinkedListIterator::remove()

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 20

    \sa insert(), setValue()
*/

/*! \fn void QMutableVectorIterator::remove()

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 21

    \sa insert(), setValue()
*/

/*! \fn void QMutableSetIterator::remove()

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 22

    \sa value()
*/

/*! \fn void QMutableListIterator::setValue(const T &value) const

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

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 23

    \sa value(), remove(), insert()
*/

/*! \fn void QMutableLinkedListIterator::setValue(const T &value) const

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

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 24

    \sa value(), remove(), insert()
*/

/*! \fn void QMutableVectorIterator::setValue(const T &value) const

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

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

    Example:
    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 25

    \sa value(), remove(), insert()
*/

/*! \fn const T &QMutableListIterator::value() const
    \fn const T &QMutableLinkedListIterator::value() const
    \fn const T &QMutableVectorIterator::value() const
    \fn const T &QMutableSetIterator::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(). After a call to previous() or findPrevious(), value() is
    equivalent to peekNext().
*/

/*!
    \fn T &QMutableListIterator::value()
    \fn T &QMutableLinkedListIterator::value()
    \fn T &QMutableVectorIterator::value()
    \overload

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

/*! \fn void QMutableListIterator::insert(const T &value)
    \fn void QMutableLinkedListIterator::insert(const T &value)
    \fn void QMutableVectorIterator::insert(const T &value)

    Inserts \a value at the current iterator position. After the
    call, the iterator is located just after the inserted item.

    \sa remove(), setValue()
*/

/*! 
    \class QMapIterator
    \inmodule QtCore

    \brief The QMapIterator class provides a Java-style const iterator for QMap and QMultiMap.

    QMap has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    QMapIterator\<Key, T\> allows you to iterate over a QMap (or a
    QMultiMap). If you want to modify the map as you iterate over
    it, use QMutableMapIterator instead.

    The QMapIterator constructor takes a QMap as argument. After
    construction, the iterator is located at the very beginning of
    the map (before the first item). Here's how to iterate over all
    the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 26

    The next() function returns the next item in the map and
    advances the iterator. The key() and value() functions return the
    key and value of the last item that was jumped over.

    Unlike STL-style iterators, Java-style iterators point \e between
    items rather than directly \e at items. The first call to next()
    advances the iterator to the position between the first and
    second item, and returns the first item; the second call to
    next() advances the iterator to the position between the second
    and third item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 27

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop. For example:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 28

    Multiple iterators can be used on the same map. If the map is
    modified while a QMapIterator is active, the QMapIterator will
    continue iterating over the original map, ignoring the modified
    copy.

    \sa QMutableMapIterator, QMap::const_iterator
*/

/*! 
    \class QHashIterator
    \inmodule QtCore

    \brief The QHashIterator class provides a Java-style const iterator for QHash and QMultiHash.

    QHash has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    QHashIterator\<Key, T\> allows you to iterate over a QHash (or a
    QMultiHash). If you want to modify the hash as you iterate over
    it, use QMutableHashIterator instead.

    The QHashIterator constructor takes a QHash as argument. After
    construction, the iterator is located at the very beginning of
    the hash (before the first item). Here's how to iterate over all
    the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 29

    The next() function returns the next item in the hash and
    advances the iterator. The key() and value() functions return the
    key and value of the last item that was jumped over.

    Unlike STL-style iterators, Java-style iterators point \e between
    items rather than directly \e at items. The first call to next()
    advances the iterator to the position between the first and
    second item, and returns the first item; the second call to
    next() advances the iterator to the position between the second
    and third item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 30

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop. For example:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 31

    Multiple iterators can be used on the same hash. If the hash is
    modified while a QHashIterator is active, the QHashIterator will
    continue iterating over the original hash, ignoring the modified
    copy.

    \sa QMutableHashIterator, QHash::const_iterator
*/

/*! 
    \class QMutableMapIterator
    \inmodule QtCore

    \brief The QMutableMapIterator class provides a Java-style non-const iterator for QMap and QMultiMap.

    QMap has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    QMutableMapIterator\<Key, T\> allows you to iterate over a QMap
    (or a QMultiMap) and modify the map. If you don't want to modify
    the map (or have a const QMap), use the slightly faster
    QMapIterator instead.

    The QMutableMapIterator constructor takes a QMap as argument.
    After construction, the iterator is located at the very beginning
    of the map (before the first item). Here's how to iterate over
    all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 32

    The next() function returns the next item in the map and
    advances the iterator. The key() and value() functions return the
    key and value of the last item that was jumped over.

    Unlike STL-style iterators, Java-style iterators point \e between
    items rather than directly \e at items. The first call to next()
    advances the iterator to the position between the first and
    second item, and returns the first item; the second call to
    next() advances the iterator to the position between the second
    and third item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 33

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop. For example:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 34

    If you want to remove items as you iterate over the map, use
    remove(). If you want to modify the value of an item, use
    setValue().

    Example:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 35

    The example removes all (key, value) pairs where the key and the
    value are the same.

    Only one mutable iterator can be active on a given map at any
    time. Furthermore, no changes should be done directly to the map
    while the iterator is active (as opposed to through the
    iterator), since this could invalidate the iterator and lead to
    undefined behavior.

    \sa QMapIterator, QMap::iterator
*/

/*! 
    \class QMutableHashIterator
    \inmodule QtCore

    \brief The QMutableHashIterator class provides a Java-style non-const iterator for QHash and QMultiHash.

    QHash has both \l{Java-style iterators} and \l{STL-style
    iterators}. The Java-style iterators are more high-level and
    easier to use than the STL-style iterators; on the other hand,
    they are slightly less efficient.

    QMutableHashIterator\<Key, T\> allows you to iterate over a QHash
    (or a QMultiHash) and modify the hash. If you don't want to modify
    the hash (or have a const QHash), use the slightly faster
    QHashIterator instead.

    The QMutableHashIterator constructor takes a QHash as argument.
    After construction, the iterator is located at the very beginning
    of the hash (before the first item). Here's how to iterate over
    all the elements sequentially:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 36

    The next() function returns the next item in the hash and
    advances the iterator. The key() and value() functions return the
    key and value of the last item that was jumped over.

    Unlike STL-style iterators, Java-style iterators point \e between
    items rather than directly \e at items. The first call to next()
    advances the iterator to the position between the first and
    second item, and returns the first item; the second call to
    next() advances the iterator to the position between the second
    and third item; and so on.

    \img javaiterators1.png

    Here's how to iterate over the elements in reverse order:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 37

    If you want to find all occurrences of a particular value, use
    findNext() or findPrevious() in a loop. For example:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 38

    If you want to remove items as you iterate over the hash, use
    remove(). If you want to modify the value of an item, use
    setValue().

    Example:

    \snippet doc/src/snippets/code/doc_src_qiterator.cpp 39

    The example removes all (key, value) pairs where the key and the
    value are the same.

    Only one mutable iterator can be active on a given hash at any
    time. Furthermore, no changes should be done directly to the hash
    while the iterator is active (as opposed to through the
    iterator), since this could invalidate the iterator and lead to
    undefined behavior.

    \sa QHashIterator, QHash::iterator
*/

/*! \fn QMapIterator::QMapIterator(const QMap<Key, T> &map)
    \fn QMutableMapIterator::QMutableMapIterator(QMap<Key, T> &map)

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

    \sa operator=()
*/

/*! \fn QHashIterator::QHashIterator(const QHash<Key, T> &hash)
    \fn QMutableHashIterator::QMutableHashIterator(QHash<Key, T> &hash)

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

    \sa operator=()
*/

/*!
    \fn QMutableMapIterator::~QMutableMapIterator()
    \fn QMutableHashIterator::~QMutableHashIterator()

    Destroys the iterator.

    \sa operator=()
*/

/*! \fn QMapIterator &QMapIterator::operator=(const QMap<Key, T> &map)
    \fn QMutableMapIterator &QMutableMapIterator::operator=(QMap<Key, T> &map)

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

    \sa toFront(), toBack()
*/

/*! \fn QHashIterator &QHashIterator::operator=(const QHash<Key, T> &hash)
    \fn QMutableHashIterator &QMutableHashIterator::operator=(QHash<Key, T> &hash)

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

    \sa toFront(), toBack()
*/

/*! \fn void QMapIterator::toFront()
    \fn void QHashIterator::toFront()
    \fn void QMutableMapIterator::toFront()
    \fn void QMutableHashIterator::toFront()

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

    \sa toBack(), next()
*/

/*! \fn void QMapIterator::toBack()
    \fn void QHashIterator::toBack()
    \fn void QMutableMapIterator::toBack()
    \fn void QMutableHashIterator::toBack()

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

    \sa toFront(), previous()
*/

/*! \fn bool QMapIterator::hasNext() const
    \fn bool QHashIterator::hasNext() const
    \fn bool QMutableMapIterator::hasNext() const
    \fn bool QMutableHashIterator::hasNext() const

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

    \sa hasPrevious(), next()
*/

/*! \fn QMapIterator::Item QMapIterator::next()
    \fn QHashIterator::Item QHashIterator::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.

    \sa hasNext(), peekNext(), previous()
*/

/*! \fn QMutableMapIterator::Item QMutableMapIterator::next()
    \fn 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.

    \sa hasNext(), peekNext(), previous()
*/

/*! \fn QMapIterator::Item QMapIterator::peekNext() const
    \fn QHashIterator::Item QHashIterator::peekNext() const

    Returns 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.

    \sa hasNext(), next(), peekPrevious()
*/

/*! \fn QMutableMapIterator::Item QMutableMapIterator::peekNext() const
    \fn 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.

    \sa hasNext(), next(), peekPrevious()
*/

/*! \fn bool QMapIterator::hasPrevious() const
    \fn bool QHashIterator::hasPrevious() const
    \fn bool QMutableMapIterator::hasPrevious() const
    \fn bool QMutableHashIterator::hasPrevious() const

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

    \sa hasNext(), previous()
*/

/*! \fn QMapIterator::Item QMapIterator::previous()
    \fn QHashIterator::Item QHashIterator::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.

    \sa hasPrevious(), peekPrevious(), next()
*/

/*! \fn QMutableMapIterator::Item QMutableMapIterator::previous()
    \fn 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.

    \sa hasPrevious(), peekPrevious(), next()
*/

/*! \fn QMapIterator::Item QMapIterator::peekPrevious() const
    \fn QHashIterator::Item QHashIterator::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.

    \sa hasPrevious(), previous(), peekNext()
*/

/*! \fn QMutableMapIterator::Item QMutableMapIterator::peekPrevious() const
    \fn 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.

    \sa hasPrevious(), previous(), peekNext()
*/

/*! \fn const T &QMapIterator::value() const
    \fn const T &QHashIterator::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().

    \sa key()
*/

/*!
    \fn const T &QMutableMapIterator::value() const
    \fn 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().

    \sa key(), setValue()
*/

/*!
    \fn T &QMutableMapIterator::value()
    \fn T &QMutableHashIterator::value()
    \overload

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

/*! \fn const Key &QMapIterator::key() const
    \fn const Key &QHashIterator::key() const
    \fn const Key &QMutableMapIterator::key() const
    \fn 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().

    \sa value()
*/

/*! \fn bool QMapIterator::findNext(const T &value)
    \fn bool QHashIterator::findNext(const T &value)
    \fn bool QMutableMapIterator::findNext(const T &value)
    \fn bool QMutableHashIterator::findNext(const T &value)

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

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

    \sa findPrevious()
*/

/*! \fn bool QMapIterator::findPrevious(const T &value)
    \fn bool QHashIterator::findPrevious(const T &value)
    \fn bool QMutableMapIterator::findPrevious(const T &value)
    \fn bool QMutableHashIterator::findPrevious(const T &value)

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

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

    \sa findNext()
*/

/*! \fn void QMutableMapIterator::remove()
    \fn void QMutableHashIterator::remove()

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

    \sa setValue()
*/

/*! \fn void QMutableMapIterator::setValue(const T &value)
    \fn void QMutableHashIterator::setValue(const T &value)

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

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

    \sa key(), value(), remove()
*/