qmap.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

    \sa value()
*/

/*!
    \fn bool QMap::iterator::operator==(const iterator &other) const
    \fn bool QMap::iterator::operator==(const const_iterator &other) const

    Returns true if \a other points to the same item as this
    iterator; otherwise returns false.

    \sa operator!=()
*/

/*!
    \fn bool QMap::iterator::operator!=(const iterator &other) const
    \fn bool QMap::iterator::operator!=(const const_iterator &other) const

    Returns true if \a other points to a different item than this
    iterator; otherwise returns false.

    \sa operator==()
*/

/*! \fn QMap::iterator QMap::iterator::operator++()

    The prefix ++ operator (\c{++i}) advances the iterator to the
    next item in the map and returns an iterator to the new current
    item.

    Calling this function on QMap::end() leads to undefined results.

    \sa operator--()
*/

/*! \fn QMap::iterator QMap::iterator::operator++(int)

    \overload

    The postfix ++ operator (\c{i++}) advances the iterator to the
    next item in the map and returns an iterator to the previously
    current item.
*/

/*! \fn QMap::iterator QMap::iterator::operator--()

    The prefix -- operator (\c{--i}) makes the preceding item
    current and returns an iterator pointing to the new current item.

    Calling this function on QMap::begin() leads to undefined
    results.

    \sa operator++()
*/

/*! \fn QMap::iterator QMap::iterator::operator--(int)

    \overload

    The prefix -- operator (\c{--i}) makes the preceding item
    current and returns an iterator pointing to the previously
    current item.
*/

/*! \fn QMap::iterator QMap::iterator::operator+(int j) const

    Returns an iterator to the item at \a j positions forward from
    this iterator. (If \a j is negative, the iterator goes backward.)

    This operation can be slow for large \a j values.

    \sa operator-()

*/

/*! \fn QMap::iterator QMap::iterator::operator-(int j) const

    Returns an iterator to the item at \a j positions backward from
    this iterator. (If \a j is negative, the iterator goes forward.)

    This operation can be slow for large \a j values.

    \sa operator+()
*/

/*! \fn QMap::iterator &QMap::iterator::operator+=(int j)

    Advances the iterator by \a j items. (If \a j is negative, the
    iterator goes backward.)

    \sa operator-=(), operator+()
*/

/*! \fn QMap::iterator &QMap::iterator::operator-=(int j)

    Makes the iterator go back by \a j items. (If \a j is negative,
    the iterator goes forward.)

    \sa operator+=(), operator-()
*/

/*! \class QMap::const_iterator
    \brief The QMap::const_iterator class provides an STL-style const iterator for QMap and QMultiMap.

    QMap features both \l{STL-style iterators} and \l{Java-style
    iterators}. The STL-style iterators are more low-level and more
    cumbersome to use; on the other hand, they are slightly faster
    and, for developers who already know STL, have the advantage of
    familiarity.

    QMap\<Key, T\>::const_iterator allows you to iterate over a QMap
    (or a QMultiMap). If you want to modify the QMap as you iterate
    over it, you must use QMap::iterator instead. It is generally
    good practice to use QMap::const_iterator on a non-const QMap as
    well, unless you need to change the QMap through the iterator.
    Const iterators are slightly faster, and can improve code
    readability.

    The default QMap::const_iterator constructor creates an
    uninitialized iterator. You must initialize it using a QMap
    function like QMap::constBegin(), QMap::constEnd(), or
    QMap::find() before you can start iterating. Here's a typical
    loop that prints all the (key, value) pairs stored in a map:

    \code
        QMap<QString, int> map;
        map.insert("January", 1);
        map.insert("February", 2);
        ...
        map.insert("December", 12);

        QMap<QString, int>::const_iterator i;
        for (i = map.constBegin(); i != map.constEnd(); ++i)
            cout << i.key() << ": " << i.value() << endl;
    \endcode

    Unlike QHash, which stores its items in an arbitrary order, QMap
    stores its items ordered by key. Items that share the same key
    (because they were inserted using QMap::insertMulti()) will
    appear consecutively, from the most recently to the least
    recently inserted value.

    Multiple iterators can be used on the same map. If you add items
    to the map, existing iterators will remain valid. If you remove
    items from the map, iterators that point to the removed items
    will become dangling iterators.

    \sa QMap::iterator, QMapIterator
*/

/*! \fn QMap::const_iterator::operator QMapData::Node *() const

    \internal
*/

/*! \typedef QMap::const_iterator::difference_type

    \internal
*/

/*! \typedef QMap::const_iterator::iterator_category

    \internal
*/

/*! \typedef QMap::const_iterator::pointer

    \internal
*/

/*! \typedef QMap::const_iterator::reference

    \internal
*/

/*! \typedef QMap::const_iterator::value_type

    \internal
*/

/*! \fn QMap::const_iterator::const_iterator()

    Constructs an uninitialized iterator.

    Functions like key(), value(), and operator++() must not be
    called on an uninitialized iterator. Use operator=() to assign a
    value to it before using it.

    \sa QMap::constBegin() QMap::constEnd()
*/

/*! \fn QMap::const_iterator::const_iterator(QMapData::Node *node)

    \internal
*/

/*! \fn QMap::const_iterator::const_iterator(const iterator &other)

    Constructs a copy of \a other.
*/

/*! \fn const Key &QMap::const_iterator::key() const

    Returns the current item's key.

    \sa value()
*/

/*! \fn const T &QMap::const_iterator::value() const

    Returns the current item's value.

    \sa key(), operator*()
*/

/*! \fn const T &QMap::const_iterator::operator*() const

    Returns the current item's value.

    Same as value().

    \sa key()
*/

/*! \fn const T *QMap::const_iterator::operator->() const

    Returns a pointer to the current item's value.

    \sa value()
*/

/*! \fn bool QMap::const_iterator::operator==(const const_iterator &other) const

    Returns true if \a other points to the same item as this
    iterator; otherwise returns false.

    \sa operator!=()
*/

/*! \fn bool QMap::const_iterator::operator!=(const const_iterator &other) const

    Returns true if \a other points to a different item than this
    iterator; otherwise returns false.

    \sa operator==()
*/

/*! \fn QMap::const_iterator QMap::const_iterator::operator++()

    The prefix ++ operator (\c{++i}) advances the iterator to the
    next item in the map and returns an iterator to the new current
    item.

    Calling this function on QMap::end() leads to undefined results.

    \sa operator--()
*/

/*! \fn QMap::const_iterator QMap::const_iterator::operator++(int)

    \overload

    The postfix ++ operator (\c{i++}) advances the iterator to the
    next item in the map and returns an iterator to the previously
    current item.
*/

/*! \fn QMap::const_iterator &QMap::const_iterator::operator--()

    The prefix -- operator (\c{--i}) makes the preceding item
    current and returns an iterator pointing to the new current item.

    Calling this function on QMap::begin() leads to undefined
    results.

    \sa operator++()
*/

/*! \fn QMap::const_iterator QMap::const_iterator::operator--(int)

    \overload

    The postfix -- operator (\c{i--}) makes the preceding item
    current and returns an iterator pointing to the previously
    current item.
*/

/*! \fn QMap::const_iterator QMap::const_iterator::operator+(int j) const

    Returns an iterator to the item at \a j positions forward from
    this iterator. (If \a j is negative, the iterator goes backward.)

    This operation can be slow for large \a j values.

    \sa operator-()
*/

/*! \fn QMap::const_iterator QMap::const_iterator::operator-(int j) const

    Returns an iterator to the item at \a j positions backward from
    this iterator. (If \a j is negative, the iterator goes forward.)

    This operation can be slow for large \a j values.

    \sa operator+()
*/

/*! \fn QMap::const_iterator &QMap::const_iterator::operator+=(int j)

    Advances the iterator by \a j items. (If \a j is negative, the
    iterator goes backward.)

    This operation can be slow for large \a j values.

    \sa operator-=(), operator+()
*/

/*! \fn QMap::const_iterator &QMap::const_iterator::operator-=(int j)

    Makes the iterator go back by \a j items. (If \a j is negative,
    the iterator goes forward.)

    This operation can be slow for large \a j values.

    \sa operator+=(), operator-()
*/

/*! \fn QDataStream &operator<<(QDataStream &out, const QMap<Key, T> &map)
    \relates QMap

    Writes the map \a map to stream \a out.

    This function requires the key and value types to implement \c
    operator<<().

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

/*! \fn QDataStream &operator>>(QDataStream &in, QMap<Key, T> &map)
    \relates QMap

    Reads a map from stream \a in into \a map.

    This function requires the key and value types to implement \c
    operator>>().

    \sa \link datastreamformat.html Format of the QDataStream operators \endlink
*/

/*! \class QMultiMap
    \brief The QMultiMap class is a convenience QMap subclass that provides multi-valued maps.

    \ingroup tools
    \ingroup shared
    \mainclass
    \reentrant

    QMultiMap\<Key, T\> is one of Qt's generic \l{container classes}.
    It inherits QMap and extends it with a few convenience functions
    that make it more suitable than QMap for storing multi-valued
    maps. A multi-valued map is a map that allows multiple values
    with the same key; QMap normally doesn't allow that, unless you
    call QMap::insertMulti().

    Because QMultiMap inherits QMap, all of QMap's functionality also
    applies to QMultiMap. For example, you can use isEmpty() to test
    whether the map is empty, and you can traverse a QMultiMap using
    QMap's iterator classes (for example, QMapIterator). But in
    addition, it provides an insert() function that corresponds to
    QMap::insertMulti(), and a replace() function that corresponds to
    QMap::insert(). It also provides convenient operator+() and
    operator+=().

    Example:
    \code
        QMultiMap<QString, int> map1, map2, map3;

        map1.insert("plenty", 100);
        map1.insert("plenty", 2000);
        // map1.size() == 2

        map2.insert("plenty", 5000);
        // map2.size() == 1

        map3 = map1 + map2;
        // map3.size() == 3
    \endcode

    Unlike QMap, QMultiMap provides no operator[]. Use value() or
    replace() if you want to access the most recently inserted item
    with a certain key.

    If you want to retrieve all the values for a single key, you can
    use values(const Key &key), which returns a QList<T>:

    \code
        QList<int> values = map.values("plenty");
        for (int i = 0; i < values.size(); ++i)
            cout << values.at(i) << endl;
    \endcode

    The items that share the same key are available from most
    recently to least recently inserted.

    If you prefer the STL-style iterators, you can call find() to get
    the iterator for the first item with a key and iterate from
    there:

    \code
        QMultiMap<QString, int>::iterator i = map.find("plenty");
        while (i != map.end() && i.key() == "plenty") {
            cout << i.value() << endl;
            ++i;
        }
    \endcode

    QMultiMap's key and value data types must be \l{assignable data
    types}. This covers most data types you are likely to encounter,
    but the compiler won't let you, for example, store a QWidget as a
    value; instead, store a QWidget *. In addition, QMultiMap's key type
    must provide operator<(). See the QMap documentation for details.

    \sa QMap, QMapIterator, QMutableMapIterator, QMultiHash
*/

/*! \fn QMultiMap::QMultiMap()

    Constructs an empty map.
*/

/*! \fn QMultiMap::QMultiMap(const QMap<Key, T> &other)

    Constructs a copy of \a other (which can be a QMap or a
    QMultiMap).

    \sa operator=()
*/

/*! \fn QMultiMap::iterator QMultiMap::replace(const Key &key, const T &value)

    Inserts a new item with the key \a key and a value of \a value.

    If there is already an item with the key \a key, that item's value
    is replaced with \a value.

    If there are multiple items with the key \a key, the most
    recently inserted item's value is replaced with \a value.

    \sa insert()
*/

/*! \fn QMultiMap::iterator QMultiMap::insert(const Key &key, const T &value)

    Inserts a new item with the key \a key and a value of \a value.

    If there is already an item with the same key in the map, this
    function will simply create a new one. (This behavior is
    different from replace(), which overwrites the value of an
    existing item.)

    \sa replace()
*/

/*! \fn QMultiMap &QMultiMap::operator+=(const QMultiMap &other)

    Inserts all the items in the \a other map into this map and
    returns a reference to this map.

    \sa insert(), operator+()
*/

/*! \fn QMultiMap QMultiMap::operator+(const QMultiMap &other) const

    Returns a map that contains all the items in this map in
    addition to all the items in \a other. If a key is common to both
    maps, the resulting map will contain the key multiple times.

    \sa operator+=()
*/

/*!
    \fn T &QMap::iterator::data() const

    Use value() instead.
*/

/*!
    \fn const T &QMap::const_iterator::data() const

    Use value() instead.
*/

/*!
    \fn iterator QMap::remove(iterator it)

    Use erase(\a it) instead.
*/

/*!
    \fn void QMap::erase(const Key &key)

    Use remove(\a key) instead.
*/

/*!
    \fn iterator QMap::insert(const Key &key, const T &value, bool overwrite);

    Use the two-argument insert() overload instead. If you don't want
    to overwrite, call contains() beforehand.

    \oldcode
        QMap<QString, int> map;
        ...
        map.insert("delay", 30000, false);
    \newcode
        QMap<QString, int> map;
        ...
        if (!map.contains("delay"))
            map.insert("delay", 30000);
    \endcode
*/

/*!
    \fn iterator QMap::replace(const Key &key, const T &value)

    Use remove() then insert().
*/