Other Functions Shared by All RWCollections
There are several other functions that are shared by all classes that inherit from
RWCollection. Note that these are
not virtual functions.
Class Conversions
The following functions allow any collection class to be converted into an
RWBag,
RWSet,
RWOrdered, or a
SortedCollection (that is, an
RWBinaryTree):
RWBag asBag() const;
RWSet asSet() const;
RWOrdered asOrderedCollection() const;
RWBinaryTree asSortedCollection() const
Note that since these functions mimic similar Smalltalk methods, they return a copy of the new collection by value. For large collections, this can be very expensive. Consider using operator+=() instead.
Inserting and Removing Other Collections
You can use these functions to respectively insert or remove the contents of their argument.
void operator+=(const RWCollection&);
void operator-=(const RWCollection&);
Selection
The function select():
typedef bool (*RWtestCollectable)(const RWCollectable*,
const void*);
RWCollection* select(RWtestCollectable tst, void*);
evaluates the function pointed to by tst for each item in the collection. It inserts those items for which the function returns true into a new collection of the same type as self and returns a pointer to it. This new collection is allocated off the heap, so you are responsible for deleting it when done.