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RedHat 9 (Linux i386) - man page for qptrlistiterator (redhat section 3qt)

QPtrListIterator(3qt)							    QPtrListIterator(3qt)

NAME
       QPtrListIterator - Iterator for QPtrList collections

SYNOPSIS
       #include <qptrlist.h>

       Inherited by QStrListIterator.

   Public Members
       QPtrListIterator ( const QPtrList<type> & list )
       ~QPtrListIterator ()
       uint count () const
       bool isEmpty () const
       bool atFirst () const
       bool atLast () const
       type * toFirst ()
       type * toLast ()
       operator type * () const
       type * operator* ()
       type * current () const
       type * operator() ()
       type * operator++ ()
       type * operator+= ( uint jump )
       type * operator-- ()
       type * operator-= ( uint jump )
       QPtrListIterator<type> & operator= ( const QPtrListIterator<type> & it )

DESCRIPTION
       The QPtrListIterator class provides an iterator for QPtrList collections.

       Define a template instance QPtrListIterator<X> to create a list iterator that operates on
       QPtrList<X> (list of X*).

       The following example is similar to the example in the QPtrList class documentation, but
       it uses QPtrListIterator. The class Employee is defined there.

	   QPtrList<Employee> list;
	   list.append( new Employee("John", "Doe", 50000) );
	   list.append( new Employee("Jane", "Williams", 80000) );
	   list.append( new Employee("Tom", "Jones", 60000) );
	   QPtrListIterator<Employee> it( list );
	   Employee *employee;
	   while ( (employee = it.current()) != 0 ) {
	       ++it;
	       cout << employee->surname().latin1() << ", " <<
		       employee->forename().latin1() << " earns " <<
		       employee->salary() << endl;
	   }

       The output is

	   Doe, John earns 50000
	   Williams, Jane earns 80000
	   Jones, Tom earns 60000

       Using a list iterator is a more robust way of traversing the list than using the QPtrList
       member functions first(), next(), current(), etc., as many iterators can traverse the same
       list independently.

       An iterator has its own current list item and can get the next and previous list items. It
       doesn't modify the list in any way.

       When an item is removed from the list, all iterators that point to that item are updated
       to point to QPtrList::current() instead to avoid dangling references.

       See also QPtrList, Collection Classes, and Non-GUI Classes.

MEMBER FUNCTION DOCUMENTATION
QPtrListIterator::QPtrListIterator ( const QPtrList<type> & list )
       Constructs an iterator for list. The current iterator item is set to point on the first
       item in the list.

QPtrListIterator::~QPtrListIterator ()
       Destroys the iterator.

bool QPtrListIterator::atFirst () const
       Returns TRUE if the current iterator item is the first list item; otherwise returns FALSE.

       See also toFirst() and atLast().

bool QPtrListIterator::atLast () const
       Returns TRUE if the current iterator item is the last list item; otherwise returns FALSE.

       See also toLast() and atFirst().

uint QPtrListIterator::count () const
       Returns the number of items in the list this iterator operates on.

       See also isEmpty().

       Example: customlayout/card.cpp.

type * QPtrListIterator::current () const
       Returns a pointer to the current iterator item. If the iterator is positioned before the
       first item in the list or after the last item in the list, 0 is returned.

       Examples:

bool QPtrListIterator::isEmpty () const
       Returns TRUE if the list is empty; otherwise returns FALSE.

       See also count().

QPtrListIterator::operator type * () const
       Cast operator. Returns a pointer to the current iterator item. Same as current().

type * QPtrListIterator::operator() ()
       Makes the succeeding item current and returns the original current item.

       If the current iterator item was the last item in the list or if it was 0, 0 is returned.

type * QPtrListIterator::operator* ()
       Asterisk operator. Returns a pointer to the current iterator item. Same as current().

type * QPtrListIterator::operator++ ()
       Prefix ++ makes the succeeding item current and returns the new current item.

       If the current iterator item was the last item in the list or if it was 0, 0 is returned.

type * QPtrListIterator::operator+= ( uint jump )
       Sets the current item to the item jump positions after the current item and returns a
       pointer to that item.

       If that item is beyond the last item or if the list is empty, it sets the current item to
       0 and returns 0

type * QPtrListIterator::operator-- ()
       Prefix - makes the preceding item current and returns the new current item.

       If the current iterator item was the first item in the list or if it was 0, 0 is returned.

type * QPtrListIterator::operator-= ( uint jump )
       Returns the item jump positions before the current item or 0 if it is beyond the first
       item. Makes this the current item.

QPtrListIterator<;type> & QPtrListIterator::operator= ( const QPtrListIterator<type> & it )
       Assignment. Makes a copy of the iterator it and returns a reference to this iterator.

type * QPtrListIterator::toFirst ()
       Sets the current iterator item to point to the first list item and returns a pointer to
       the item. Sets the current item to 0 and returns 0 if the list is empty.

       See also toLast() and atFirst().

type * QPtrListIterator::toLast ()
       Sets the current iterator item to point to the last list item and returns a pointer to the
       item. Sets the current item to 0 and returns 0 if the list is empty.

       See also toFirst() and atLast().

SEE ALSO
       http://doc.trolltech.com/qptrlistiterator.html http://www.trolltech.com/faq/tech.html

COPYRIGHT
       Copyright 1992-2001 Trolltech AS, http://www.trolltech.com.  See the license file included
       in the distribution for a complete license statement.

AUTHOR
       Generated automatically from the source code.

BUGS
       If you find a bug in Qt, please report it as described in
       http://doc.trolltech.com/bughowto.html.	Good bug reports help us to help you. Thank you.

       The definitive Qt documentation is provided in HTML format; it is located at
       $QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
       provided as a convenience for those users who prefer man pages, although this format is
       not officially supported by Trolltech.

       If you find errors in this manual page, please report them to qt-bugs@trolltech.com.
       Please include the name of the manual page (qptrlistiterator.3qt) and the Qt version
       (3.1.1).

Trolltech AS				 9 December 2002		    QPtrListIterator(3qt)


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