qptrdictiterator.3qt - Man Page

#include <qptrdict.h>

The QPtrDictIterator class provides an iterator for QPtrDict collections.

QPtrDictIterator is implemented as a template class. Define a template instance QPtrDictIterator<X> to create a dictionary iterator that operates on QPtrDict<X> (dictionary of X*).

Example:

    QPtrDict<char> fields;
    QLineEdit *le1 = new QLineEdit( this );
    le1->setText( "Simpson" );
    QLineEdit *le2 = new QLineEdit( this );
    le2->setText( "Homer" );
    QLineEdit *le3 = new QLineEdit( this );
    le3->setText( "45" );
    fields.insert( le1, "Surname" );
    fields.insert( le2, "Forename" );
    fields.insert( le3, "Age" );
    QPtrDictIterator<char> it( fields );
    for( ; it.current(); ++it ) {
        QLineEdit *le = (QLineEdit)it.currentKey();
        cout << it.current() << ": " << le->text() << endl;
    }
    cout << endl;
    // Output (random order):
    //  Forename: Homer
    //  Age: 45
    //  Surname: Simpson

In the example we insert some line edits into a dictionary, associating a string with each. We then iterate over the dictionary printing the associated strings.

Multiple iterators may independently traverse the same dictionary. A QPtrDict knows about all the iterators that are operating on the dictionary. When an item is removed from the dictionary, QPtrDict updates all iterators that refer the removed item to point to the next item in the traversing order.

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

Constructs an iterator for dict. The current iterator item is set to point on the first item in the dict.

Destroys the iterator.

Returns the number of items in the dictionary this iterator operates on.

See also isEmpty().

Returns a pointer to the current iterator item's value.

Returns the current iterator item's key.

Returns TRUE if the dictionary is empty; otherwise returns FALSE.

See also count().

Cast operator. Returns a pointer to the current iterator item. Same as current().

Makes the succeeding item current and returns the original current item.

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

Prefix ++ makes the succeeding item current and returns the new current item.

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

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 dictionary is empty, it sets the current item to 0 and returns 0.

Sets the current iterator item to point to the first item in the dictionary and returns a pointer to the item. If the dictionary is empty, it sets the current item to 0 and returns 0.

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The man page QPtrDictIterator.3qt(3) is an alias of qptrdictiterator.3qt(3).