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-/****************************************************************************
-**
-** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
-** Contact: Nokia Corporation (qt-info@nokia.com)
-**
-** This file is part of the documentation of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** No Commercial Usage
-** This file contains pre-release code and may not be distributed.
-** You may use this file in accordance with the terms and conditions
-** contained in the either Technology Preview License Agreement or the
-** Beta Release License Agreement.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Nokia gives you certain
-** additional rights. These rights are described in the Nokia Qt LGPL
-** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
-** package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file. Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-** If you are unsure which license is appropriate for your use, please
-** contact the sales department at http://qt.nokia.com/contact.
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-/*!
- \class Q3ValueList
- \brief The Q3ValueList class is a value-based template class that
- provides lists.
- \compat
-
- Q3ValueList is a Qt implementation of an STL-like list container.
- It can be used in your application if the standard \c list is not
- available for your target platforms.
-
- Q3ValueList\<T\> defines a template instance to create a list of
- values that all have the class T. Note that Q3ValueList does not
- store pointers to the members of the list; it holds a copy of
- every member. This is why these kinds of classes are called "value
- based"; Q3PtrList and Q3Dict are "pointer based".
-
- Q3ValueList contains and manages a collection of objects of type T
- and provides iterators that allow the contained objects to be
- addressed. Q3ValueList owns the contained items. For more relaxed
- ownership semantics, see Q3PtrCollection and friends which are
- pointer-based containers.
-
- Some classes cannot be used within a Q3ValueList, for example, all
- classes derived from QObject and thus all classes that implement
- widgets. Only values can be used in a Q3ValueList. To qualify as a
- value the class must provide:
- \list
- \i a copy constructor;
- \i an assignment operator;
- \i a default constructor, i.e. a constructor that does not take any arguments.
- \endlist
-
- Note that C++ defaults to field-by-field assignment operators and
- copy constructors if no explicit version is supplied. In many
- cases this is sufficient.
-
- In addition, some compilers (e.g. Sun CC) might require that the
- class provides an equality operator (operator==()).
-
- Q3ValueList's function naming is consistent with the other Qt
- classes (e.g. count(), isEmpty()). Q3ValueList also provides extra
- functions for compatibility with STL algorithms, such as size()
- and empty(). Programmers already familiar with the STL \c list may
- prefer to use the STL-compatible functions.
-
- Example:
- \snippet doc/src/snippets/code/doc_src_q3valuelist.qdoc 0
-
-
- Notice that the latest changes to Mary's salary did not affect the
- value in the list because the list created a copy of Mary's entry.
-
- There are several ways to find items in the list. The begin() and
- end() functions return iterators to the beginning and end of the
- list. The advantage of getting an iterator is that you can move
- forward or backward from this position by
- incrementing/decrementing the iterator. The iterator returned by
- end() points to the item which is one \e past the last item in the
- container. The past-the-end iterator is still associated with the
- list it belongs to, however it is \e not dereferenceable;
- operator*() will not return a well-defined value. If the list is
- empty(), the iterator returned by begin() will equal the iterator
- returned by end().
-
- It is safe to have multiple iterators a the list at the same
- time. If some member of the list is removed, only iterators
- pointing to the removed member become invalid. Inserting into the
- list does not invalidate any iterator. For convenience, the
- function last() returns a reference to the last item in the list,
- and first() returns a reference to the first item. If the
- list is empty(), both last() and first() have undefined behavior
- (your application will crash or do unpredictable things). Use
- last() and first() with caution, for example:
-
- \snippet doc/src/snippets/code/doc_src_q3valuelist.qdoc 1
-
- Because Q3ValueList is value-based there is no need to be careful
- about deleting items in the list. The list holds its own copies
- and will free them if the corresponding member or the list itself
- is deleted. You can force the list to free all of its items with
- clear().
-
- Q3ValueList is shared implicitly, which means it can be copied in
- constant time, i.e. O(1). If multiple Q3ValueList instances share
- the same data and one needs to modify its contents, this modifying
- instance makes a copy and modifies its private copy; therefore it
- does not affect the other instances; this takes O(n) time. This is
- often called "copy on write". If a Q3ValueList is being used in a
- multi-threaded program, you must protect all access to the list.
- See \l QMutex.
-
- There are several ways to insert items into the list. The
- prepend() and append() functions insert items at the beginning and
- the end of the list respectively. The insert() function comes in
- several flavors and can be used to add one or more items at
- specific positions within the list.
-
- Items can also be removed from the list in several ways. There
- are several variants of the remove() function, which removes a
- specific item from the list. The remove() function will find and
- remove items according to a specific item value.
-
- \sa Q3ValueListIterator
-*/
-
-/*! \typedef Q3ValueList::iterator
- The list's iterator type, Q3ValueListIterator. */
-/*! \typedef Q3ValueList::const_iterator
- The list's const iterator type, Q3ValueListConstIterator. */
-/*! \typedef Q3ValueList::value_type
- The type of the object stored in the list, T. */
-/*! \typedef Q3ValueList::pointer
- The pointer to T type. */
-/*! \typedef Q3ValueList::const_pointer
- The const pointer to T type. */
-/*! \typedef Q3ValueList::reference
- The reference to T type. */
-/*! \typedef Q3ValueList::const_reference
- The const reference to T type. */
-/*! \typedef Q3ValueList::size_type
- An unsigned integral type, used to represent various sizes. */
-/*! \typedef Q3ValueList::difference_type
- \internal
-*/
-/*!
- \fn Q3ValueList::Q3ValueList()
-
- Constructs an empty list.
-*/
-
-/*!
- \fn Q3ValueList::Q3ValueList( const Q3ValueList<T>& l )
- \fn Q3ValueList::Q3ValueList( const QList<T>& l )
- \fn Q3ValueList::Q3ValueList( const QLinkedList<T>& l )
-
- Constructs a copy of \a l.
-*/
-
-/*!
- \fn Q3ValueList::Q3ValueList( const std::list<T>& l )
-
- Contructs a copy of \a l.
-
- This constructor is provided for compatibility with STL
- containers.
-*/
-
-/*!
- \fn Q3ValueList::~Q3ValueList()
-
- Destroys the list. References to the values in the list and all
- iterators of this list become invalidated. Note that it is
- impossible for an iterator to check whether or not it is valid:
- Q3ValueList is highly tuned for performance, not for error
- checking.
-*/
-
-/*!
- \fn bool Q3ValueList::operator== ( const Q3ValueList<T>& l ) const
-
- Compares both lists.
-
- Returns TRUE if this list and \a l are equal; otherwise returns
- FALSE.
-*/
-
-/*!
- \fn bool Q3ValueList::operator== ( const std::list<T>& l ) const
-
- \overload
-
- Returns TRUE if this list and \a l are equal; otherwise returns
- FALSE.
-
- This operator is provided for compatibility with STL containers.
-*/
-
-/*!
- \fn Q3ValueList<T>& Q3ValueList::operator= ( const Q3ValueList<T>& l )
-
- Assigns \a l to this list and returns a reference to this list.
-
- All iterators of the current list become invalidated by this
- operation. The cost of such an assignment is O(1) since Q3ValueList
- is implicitly shared.
-*/
-
-/*!
- \fn Q3ValueList<T>& Q3ValueList::operator= ( const QList<T>& l )
-
- Assigns \a l to this list and returns a reference to this list.
-
- All iterators of the current list become invalidated by this
- operation.
-*/
-
-/*!
- \fn Q3ValueList<T>& Q3ValueList::operator= ( const std::list<T>& l )
-
- \overload
-
- Assigns the contents of \a l to the list.
-
- All iterators of the current list become invalidated by this
- operation.
-*/
-
-/*!
- \fn bool Q3ValueList::operator!= ( const Q3ValueList<T>& l ) const
-
- Compares both lists.
-
- Returns TRUE if this list and \a l are unequal; otherwise returns
- FALSE.
-*/
-
-/*!
- \fn iterator Q3ValueList::insert( typename Q3ValueList<T>::Iterator it, const T& x )
-
- Inserts the value \a x in front of the item pointed to by the
- iterator, \a it.
-
- Returns an iterator pointing at the inserted item.
-
- \sa append(), prepend()
-*/
-
-/*!
- \fn uint Q3ValueList::remove( const T& x )
-
- \overload
-
- Removes all items that have value \a x and returns the number of
- removed items.
-*/
-
-/*!
- \fn QDataStream& operator>>( QDataStream& s, Q3ValueList<T>& l )
-
- \relates Q3ValueList
-
- Reads a list, \a l, from the stream \a s. The type T stored in the
- list must implement the streaming operator.
-*/
-
-/*!
- \fn QDataStream& operator<<( QDataStream& s, const Q3ValueList<T>& l )
-
- \overload
- \relates Q3ValueList
-
- Writes a list, \a l, to the stream \a s. The type T stored in the
- list must implement the streaming operator.
-*/
-
-/*!
- \fn void Q3ValueList::insert( typename Q3ValueList<T>::Iterator pos,
- typename Q3ValueList<T>::size_type n, const T& x )
-
- \overload
-
- Inserts \a n copies of \a x before position \a pos.
-*/
-
-/*!
- \fn Q3ValueList<T>& Q3ValueList::operator<< ( const T& x )
-
- Adds the value \a x to the end of the list.
-
- Returns a reference to the list.
-*/
-
-/*!
- \fn const T& Q3ValueList::operator[] ( typename Q3ValueList<T>::size_type i ) const
-
- Returns a const reference to the item with index \a i in the list.
- It is up to you to check whether this item really exists. You can
- do that easily with the count() function. However this operator
- does not check whether \a i is in range and will deliver undefined
- results if it does not exist.
-
- \warning This function uses a linear search and can be extremely
- slow for large lists. Q3ValueList is not optimized for random item
- access. If you need random access use a different container, such
- as Q3ValueVector.
-*/
-
-/*!
- \fn T& Q3ValueList::operator[] ( typename Q3ValueList<T>::size_type i )
-
- \overload
-
- Returns a non-const reference to the item with index \a i.
-*/
-
-/*!
- \fn const_iterator Q3ValueList::at( typename Q3ValueList<T>::size_type i ) const
-
- Returns an iterator pointing to the item at position \a i in the
- list, or an undefined value if the index is out of range.
-
- \warning This function uses a linear search and can be extremely
- slow for large lists. Q3ValueList is not optimized for random item
- access. If you need random access use a different container, such
- as Q3ValueVector.
-*/
-
-/*!
- \fn iterator Q3ValueList::at( typename Q3ValueList<T>::size_type i )
-
- \overload
-
- Returns an iterator pointing to the item at position \a i in the
- list, or an undefined value if the index is out of range.
-
-*/
-
-/*!
- \fn iterator Q3ValueList::fromLast()
-
- \overload
-
- Returns an iterator to the last item in the list, or end() if
- there is no last item.
-
- Use the end() function instead. For example:
-
- \snippet doc/src/snippets/code/doc_src_q3valuelist.qdoc 2
-
-*/
-
-/*!
- \fn const_iterator Q3ValueList::fromLast() const
-
- Returns an iterator to the last item in the list, or end() if
- there is no last item.
-
- Use the end() function instead. For example:
-
- \snippet doc/src/snippets/code/doc_src_q3valuelist.qdoc 3
-
-*/
-
-/*!
- \fn Q3ValueList<T> Q3ValueList::operator+( const Q3ValueList<T>& l ) const
-
- Creates a new list and fills it with the items of this list. Then
- the items of \a l are appended. Returns the new list.
-*/
-
-/*!
- \fn Q3ValueList<T>& Q3ValueList::operator+= ( const Q3ValueList<T>& l )
-
- Appends the items of \a l to this list. Returns a reference to
- this list.
-*/
-
-/*!
- \fn Q3ValueList<T>& Q3ValueList::operator+= ( const T& x )
-
- \overload
-
- Appends the value \a x to the list. Returns a reference to the
- list.
-*/
-
-/*!
- \fn iterator Q3ValueList::append( const T& x )
-
- Inserts \a x at the end of the list.
-
- \sa insert(), prepend()
-*/
-
-/*!
- \fn iterator Q3ValueList::prepend( const T& x )
-
- Inserts \a x at the beginning of the list.
-
- \sa insert(), append()
-*/
-
-/*!
- \fn iterator Q3ValueList::remove( typename Q3ValueList<T>::Iterator it )
-
- Removes the item pointed to by \a it from the list. No iterators
- other than \a it or other iterators pointing at the same item as
- \a it are invalidated. Returns an iterator to the next item after
- \a it, or end() if there is no such item.
-
- \sa clear()
-*/
-
-/*!
- \fn uint Q3ValueList::contains( const T& x ) const
-
- Returns the number of occurrences of the value \a x in the list.
-*/
-
-/*!
- \class Q3ValueListIterator
- \brief The Q3ValueListIterator class provides an iterator for Q3ValueList.
- \compat
-
- An iterator is a class for accessing the items of a container
- class: a generalization of the index in an array. A pointer
- into a "const char *" and an index into an "int[]" are both
- iterators, and the general idea is to provide that functionality
- for any data structure.
-
- The Q3ValueListIterator class is an iterator for Q3ValueList
- instantiations. You can create the appropriate iterator type by
- using the \c iterator typedef provided by Q3ValueList.
-
- The only way to access the items in a Q3ValueList is to use an
- iterator.
-
- Example (see Q3ValueList for the complete code):
- \snippet doc/src/snippets/code/doc_src_q3valuelist.qdoc 4
-
- Q3ValueList is highly optimized for performance and memory usage.
- This means that you must be careful: Q3ValueList does not know
- about all its iterators and the iterators don't know to which list
- they belong. This makes things very fast, but if you're not
- careful, you can get spectacular bugs. Always make sure iterators
- are valid before dereferencing them or using them as parameters to
- generic algorithms in the STL.
-
- Using an invalid iterator is undefined (your application will
- probably crash). Many Qt functions return const value lists; to
- iterate over these you should make a copy and iterate over the
- copy.
-
- For every Iterator there is a ConstIterator. When accessing a
- Q3ValueList in a const environment or if the reference or pointer
- to the list is itself const, then you must use the ConstIterator.
- Its semantics are the same as the Iterator, but it only returns
- const references.
-
- \sa Q3ValueList, Q3ValueListConstIterator
-*/
-
-/*!
- \fn Q3ValueListIterator::Q3ValueListIterator()
-
- Constructs an unitialized iterator.
-*/
-
-/*!
- \fn Q3ValueListIterator::Q3ValueListIterator(const Q3ValueListIterator &o)
- \fn Q3ValueListIterator::Q3ValueListIterator(const typename QLinkedList<T>::iterator &o)
-
- Constucts a copy of iterator \a o.
-*/
-
-/*!
- \class Q3ValueListConstIterator
- \brief The Q3ValueListConstIterator class provides a const iterator
- for Q3ValueList.
- \compat
-
- In contrast to Q3ValueListIterator, this class is used to iterate
- over a const list. It does not allow modification of the values of
- the list since that would break const semantics.
-
- You can create the appropriate const iterator type by using the \c
- const_iterator typedef provided by Q3ValueList.
-
- For more information on Q3ValueList iterators, see
- Q3ValueListIterator.
-
- \sa Q3ValueListIterator, Q3ValueList
-*/
-
-/*!
- \fn Q3ValueListConstIterator::Q3ValueListConstIterator()
-
- Constructs an unitialized iterator.
-*/
-
-/*!
- \fn Q3ValueListConstIterator::Q3ValueListConstIterator(const Q3ValueListConstIterator &o)
- \fn Q3ValueListConstIterator::Q3ValueListConstIterator(const typename QLinkedList<T>::const_iterator &o)
- \fn Q3ValueListConstIterator::Q3ValueListConstIterator(const typename QLinkedList<T>::iterator &o)
-
- Constructs a copy of iterator \a o.
-*/
-
-/*!
- \typedef Q3ValueList::Iterator
-
- This iterator is an instantiation of Q3ValueListIterator for the
- same type as this Q3ValueList. In other words, if you instantiate
- Q3ValueList<int>, Iterator is a Q3ValueListIterator<int>. Several
- member function use it, such as Q3ValueList::begin(), which returns
- an iterator pointing to the first item in the list.
-
- Functionally, this is almost the same as ConstIterator. The only
- difference is that you cannot use ConstIterator for non-const
- operations, and that the compiler can often generate better code
- if you use ConstIterator.
-
- \sa Q3ValueListIterator ConstIterator
-*/
-
-/*!
- \typedef Q3ValueList::ConstIterator
-
- This iterator is an instantiation of Q3ValueListConstIterator for
- the same type as this Q3ValueList. In other words, if you
- instantiate Q3ValueList<int>, ConstIterator is a
- Q3ValueListConstIterator<int>. Several member function use it, such
- as Q3ValueList::begin(), which returns an iterator pointing to the
- first item in the list.
-
- Functionally, this is almost the same as Iterator. The only
- difference is you cannot use ConstIterator for non-const
- operations, and that the compiler can often generate better code
- if you use ConstIterator.
-
- \sa Q3ValueListIterator Iterator
-*/
-
-/*!
- \fn Q3ValueList::operator QList<T>() const
-
- Automatically converts a Q3ValueList<T> into a QList<T>.
-*/