Q3DictIterator Class Reference
[Qt3Support module]

Detailed Description

The Q3DictIterator class provides an iterator for Q3Dict collections.

Q3DictIterator is implemented as a template class. Define a template instance Q3DictIterator<X> to create a dictionary iterator that operates on Q3Dict<X> (dictionary of X*).

The traversal order is arbitrary; when we speak of the "first", "last" and "next" item we are talking in terms of this arbitrary order.

Multiple iterators may independently traverse the same dictionary. A Q3Dict knows about all the iterators that are operating on the dictionary. When an item is removed from the dictionary, Q3Dict updates all iterators that are referring to the removed item to point to the next item in the (arbitrary) traversal order.

Example:

 Q3Dict<QLineEdit> fields;
 fields.insert( "forename", new QLineEdit( this ) );
 fields.insert( "surname", new QLineEdit( this ) );
 fields.insert( "age", new QLineEdit( this ) );

 fields["forename"]->setText( "Homer" );
 fields["surname"]->setText( "Simpson" );
 fields["age"]->setText( "45" );

 Q3DictIterator<QLineEdit> it( fields );
 for( ; it.current(); ++it )
     cout << it.currentKey() << ": " << it.current()->text() << endl;
 cout << endl;

 // Output (random order):
 //      age: 45
 //      surname: Simpson
 //      forename: Homer

In the example we insert some pointers to line edits into a dictionary, then iterate over the dictionary printing the strings associated with the line edits.

See also Q3Dict.

Member Function Documentation