Classes - Annotated - Tree - Functions - Home - Structure

QAsciiDictIterator Class Reference

The QAsciiDictIterator class provides an iterator for QAsciiDict collections. More...

#include <qasciidict.h>

Inherits QGDictIterator.

List of all member functions.

Public Members

QAsciiDictIterator ( const QAsciiDict<type> & dict )
~QAsciiDictIterator ()
uint count () const
bool isEmpty () const
type* toFirst ()
operator type* ()const
type* current () const
const char* currentKey () const
type* operator ()
type* operator++ ()
type* operator+= ( uint jump )

Detailed Description

The QAsciiDictIterator class provides an iterator for QAsciiDict collections.

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

Example:

    #include <qasciidict.h>
    #include <stdio.h>

    void main()
    {
      // Creates a dictionary that maps char* ==> char* (case insensitive)
        QAsciiDict<char> dict( 17, FALSE );

        dict.insert( "France", "Paris" );
        dict.insert( "Russia", "Moscow" );
        dict.insert( "Norway", "Oslo" );

        QAsciiDictIterator<char> it( dict ); // iterator for dict

        while ( it.current() ) {
            printf( "%s -> %s\n", it.currentKey(), it.current() );
            ++it;
        }
    }

Program output:

        Russia -> Moscow
        Norway -> Oslo
        France -> Paris

Note that the traversal order is arbitrary, you are not guaranteed the order above.

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

See also QAsciiDict and Collection Classes

Member Function Documentation

QAsciiDictIterator::QAsciiDictIterator ( const QAsciiDict<type> & dict )

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

QAsciiDictIterator::~QAsciiDictIterator ()

Destroys the iterator.

QAsciiDictIterator::operator type * () const

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

uint QAsciiDictIterator::count () const

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

type * QAsciiDictIterator::current () const

Returns a pointer to the current iterator item.

const char * QAsciiDictIterator::currentKey () const

Returns a pointer to the key for the current iterator item.

bool QAsciiDictIterator::isEmpty () const

Returns TRUE if the dictionary is empty, i.e. count() == 0, otherwise FALSE.

type * QAsciiDictIterator::operator() ()

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 null, null is returned.

type * QAsciiDictIterator::operator++ ()

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 null, null is returned.

type * QAsciiDictIterator::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 dictionary is empty, it sets the current item to null and returns null.

type * QAsciiDictIterator::toFirst ()

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 null and returns null.

Search the documentation, FAQ, qt-interest archive and more (uses www.trolltech.com):

Trademarks

Qt version 2.2.1