Inherited by QObjectListIterator and QStrListIterator.
.PP
.SS "Public Members"
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.BI "\fBQPtrListIterator\fR ( const QPtrList<type> & list )"
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.BI "\fB~QPtrListIterator\fR ()"
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.BI "uint \fBcount\fR () const"
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.BI "bool \fBisEmpty\fR () const"
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.BI "bool \fBatFirst\fR () const"
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.BI "bool \fBatLast\fR () const"
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.BI "type * \fBtoFirst\fR ()"
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.BI "type * \fBtoLast\fR ()"
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.BI "\fBoperator type *\fR () const"
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.BI "type * \fBoperator*\fR ()"
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.BI "type * \fBcurrent\fR () const"
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.BI "type * \fBoperator()\fR ()"
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.BI "type * \fBoperator++\fR ()"
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.BI "type * \fBoperator+=\fR ( uint jump )"
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.BI "type * \fBoperator--\fR ()"
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.BI "type * \fBoperator-=\fR ( uint jump )"
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.BI "QPtrListIterator<type> & \fBoperator=\fR ( const QPtrListIterator<type> & it )"
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.SH DESCRIPTION
The QPtrListIterator class provides an iterator for QPtrList collections.
.PP
Define a template instance QPtrListIterator<X> to create a list iterator that operates on QPtrList<X> (list of X*).
.PP
The following example is similar to the example in the QPtrList class documentation, but it uses QPtrListIterator. The class Employee is defined there.
.PP
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QPtrList<Employee> list;
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list.append( new Employee("John", "Doe", 50000) );
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list.append( new Employee("Jane", "Williams", 80000) );
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list.append( new Employee("Tom", "Jones", 60000) );
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QPtrListIterator<Employee> it( list );
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Employee *employee;
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while ( (employee = it.current()) != 0 ) {
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++it;
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cout << employee->surname().latin1() << ", " <<
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employee->forename().latin1() << " earns " <<
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employee->salary() << endl;
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}
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.fi
.PP
The output is
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Doe, John earns 50000
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Williams, Jane earns 80000
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Jones, Tom earns 60000
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.fi
.PP
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.
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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.
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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.
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See also QPtrList, Collection Classes, and Non-GUI Classes.
.SH MEMBER FUNCTION DOCUMENTATION
.SH "QPtrListIterator::QPtrListIterator ( const QPtrList<type> & list )"
Constructs an iterator for \fIlist\fR. The current iterator item is set to point on the first item in the \fIlist\fR.
.SH "QPtrListIterator::~QPtrListIterator ()"
Destroys the iterator.
.SH "bool QPtrListIterator::atFirst () const"
Returns TRUE if the current iterator item is the first list item; otherwise returns FALSE.
.PP
See also toFirst() and atLast().
.SH "bool QPtrListIterator::atLast () const"
Returns TRUE if the current iterator item is the last list item; otherwise returns FALSE.
.PP
See also toLast() and atFirst().
.SH "uint QPtrListIterator::count () const"
Returns the number of items in the list this iterator operates on.
.PP
See also isEmpty().
.PP
Example: customlayout/card.cpp.
.SH "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.
.PP
Examples:
.)l canvas/canvas.cpp, customlayout/card.cpp, and customlayout/flow.cpp.
.SH "bool QPtrListIterator::isEmpty () const"
Returns TRUE if the list is empty; otherwise returns FALSE.
.PP
See also count().
.SH "QPtrListIterator::operator type * () const"
Cast operator. Returns a pointer to the current iterator item. Same as current().
.SH "type * QPtrListIterator::operator() ()"
Makes the succeeding item current and returns the original current item.
.PP
If the current iterator item was the last item in the list or if it was 0, 0 is returned.
.SH "type * QPtrListIterator::operator* ()"
Asterisk operator. Returns a pointer to the current iterator item. Same as current().
.SH "type * QPtrListIterator::operator++ ()"
Prefix ++ makes the succeeding item current and returns the new current item.
.PP
If the current iterator item was the last item in the list or if it was 0, 0 is returned.
Returns the item \fIjump\fR positions before the current item or 0 if it is beyond the first item. Makes this the current item.
.SH "QPtrListIterator<type> & QPtrListIterator::operator= ( const QPtrListIterator<type> & it )"
Assignment. Makes a copy of the iterator \fIit\fR and returns a reference to this iterator.
.SH "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.
.PP
See also toLast() and atFirst().
.SH "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.
