2,246 papers · page 110 of 113
We are currently designing a class modification methodology for GemStone. We describe the current status of the design. We choose from two basic approaches and then introduce those aspects of GemStone necessary for an understanding of the paper. After defining a set of invariants…
The relation as a semantic construct in an object-oriented language clearly expresses associations and constraints among objects which would otherwise be buried in implementation code. The externalization of references between objects permits a symmetric, non-redundant conceptual…
Though Ada and Modula-2 are not object-oriented languages, an object-oriented viewpoint is crucial for effective use of their module facilities. It is therefore instructive to compare the capabilities of a modular language such as Ada with an archetypal object-oriented language s…
This paper compares two approaches to meeting the data handling requirements of Intermedia, a hypermedia sysfem developed at fhe institute for Research in information and Scholarship at Brown Universify. Intermedia, though wriffen using an object-oriented programming language, re…
Inheritance and delegation are alternate methods for incremental definition and sharing. It has commonly been believed that delegation provides a more powerful model. This paper demonstrates that there is a “natural” model of inheritance which captures all of the properties of de…
The type system of a programming language system PL/LL is described. PL is a simple object oriented programming language and LL is a language for composing PL modules into programs. The goals of the PL/LL system are to enable the programming of efficient object-oriented computati…
Self is a new object-oriented language for exploratory programming based on a small number of simple and concrete ideas: prototypes, slots, and behavior. Prototypes combine inheritance and instantiation to provide a framework that is simpler and more flexible than most object-ori…
The design space of object-based languages is characterized in terms of objects, classes, inheritance, data abstraction, strong typing, concurrency, and persistence. Language classes (paradigms) associated with interesting subsets of these features are identified and language des…
ConcurrentSmalltalk is an object-oriented concurrent programming language/system which has been running since late 1985. ConcurrentSmalltalk has the following features:
Ida is an object-oriented framework for interactive data graphics. It can be used for independent data examination or integrated into application user interfaces. Ida's model of graphics is composed of five basic elements: Presentations, Assemblies, Data Sources, Data Displays, a…
This paper describes the design of an algebra system Views implemented in Smalltalk. Views contains facilities for dynamic creation and manipulation of computational domains, for viewing these domains as various categories such as groups, rings, or fields, and for expressing algo…
The Flamingo Window Management System is based on a remote method invocation mechanism that provides separate processes running in a heterogeneous, distributed computing environment with complete access to Flamingo's objects and methods. This object-oriented interface has made Fl…
We discuss a recent attempt at providing a more efficient compilation system for the Smalltalk-80™ language than currently exists. The approach is unique in that it attempts to work within the existing semantics of the language. A type declaration and inference mechanism is devel…
QUICKTALK is a dialect of Smalltalk-80 that can be compiled directly into native machine code, instead of virtual machine bytecodes. The dialect includes “hints” on the class of method arguments, instance variables, and class variables. We designed the dialect to describe primiti…
Virtual Instruments1 is an experimental programming environment for developing electronic test and measurement (T&M) applications. Intended users are test engineers, who are not programmers, but computer literate domain specialists. Unlike traditional programming environments, th…
Emerald is an object-based language for the construction of distributed applications. The principal features of Emerald include a uniform object model appropriate for programming both private local objects and shared remote objects, and a type system that permits multiple user-de…
We describe an object-oriented architecture for intelligent tutoring systems. The architecture is oriented around objects that represent the various knowledge elements that are to be taught by the tutor. Each of these knowledge elements, called bites, inherits both a knowledge or…