RWIterator

Module:  Essential Tools Module   Group:  RWCollectable Classes

Does not inherit

• Local Index
• Synopsis
• Description
• Persistence
• Public Virtual Functions

Members

findNext()

key()

operator()

reset()

#include <rw/iterator.h>
typedef RWIterator Iterator;  // "Smalltalk" typedef

Class RWIterator is an abstract base class for iterators used by the Smalltalk-like collection classes. The class contains virtual functions for positioning and resetting the iterator. They are all pure virtual functions, meaning that deriving classes must supply a definition. The descriptions below are intended to be generic -- all inheriting iterators generally follow the described pattern.

None

virtual RWCollectable*
findNext(const RWCollectable* target) = 0;

Moves the iterator forward to the next item which "matches" the object pointed to by target and returns it or nil if no item was found. For most collections, an item "matches" the target if either isEqual() or compareTo() indicate equivalence, whichever is appropriate for the actual collection type. However, when an iterator is used with an "identity collection" (i.e., RWIdentitySet and RWIdentityDictionary), it looks for an item with the same address (i.e., "is identical to").

virtual RWCollectable*
key() const = 0;

Returns the item at the current iterator position.

virtual RWCollectable*
operator()() = 0;

Advances the iterator and returns the next item, or rwnil if the end of the collection has been reached.

virtual void
reset() = 0;

Resets the iterator to the state it had immediately after construction.

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