HP Integrity NonStop J-Series - Manual (Page 27)

persistence, internationalization, and other issues, and a number of implementation classes that
implement these interfaces. Although public, the implementation classes act like private classes.
They are not designed to be used, and are therefore not documented.
Some Tools.h++ classes are further categorized as collection classes, or collections. A central
feature of Tools.h++, the collection classes fall into three groups:
Template-based collection classes, called collection class templates, or just templates, for
short; ●
Generic collection classes; ●
Smalltalk-like collection classes. ●
Regardless of their implementation, collection classes generally follow the Smalltalk naming
conventions and semantical model: SortedCollection, Dictionaries, Bags, Sets, and so on. They
use similar interfaces, allowing them to be interchanged easily. The template-based and generic
collections will hold any kind of object; the Smalltalk-like collections require that all collected
items inherit from
RWCollectable .
Choosing which collection classes to use in your programs is not a trivial task. We have added
an appendix called Choosing a Collection to help you decide which class is the best for your
purposes.
Table 2 at the end of this chapter gives the class hierarchy of all the public Tools.h++ classes.
In addition to these public classes, Tools.h++ contains other classes for its own internal use.