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Ralph Johnson, Erich Gamma, John Vlissides, Richard Helm
Capturing a wealth of experience about the design of object-oriented software, four top-notch designers present a catalog of simple and succinct solutions to commonly occurring design problems. Previously undocumented, these 23 patterns allow designers to create more flexible, elegant, and ultimately reusable designs without having to rediscover the design solutions themselves. The authors begin by describing what patterns are and how they can help you design object-oriented software. They then go on to systematically name, explain, evaluate, and catalog recurring designs in object-oriented systems. With Design Patterns as your guide, you will learn how these important patterns fit into the software development process, and how you can leverage them to solve your own design problems most efficiently. Each pattern describes the circumstances in which it is applicable, when it can be applied in view of other design constraints, and the consequences and trade-offs of using the pattern within a larger design. All patterns are compiled from real systems and are based on real-world examples. Each pattern also includes code that demonstrates how it may be implemented in object-oriented programming languages like C++ or Smalltalk. 0201633612B07092001
Gregor Kiczales, Jim Des Rivières, Daniel Gureasko Bobrow
The CLOS metaobject protocol is an elegant, high-performance extension to the CommonLisp Object System. The authors, who developed the metaobject protocol and who were among the group that developed CLOS, introduce this new approach to programming language design, describe its evolution and design principles, and present a formal specification of a metaobject protocol for CLOS.Kiczales, des Rivières, and Bobrow show that the "art of metaobject protocol design" lies in creating a synthetic combination of object-oriented and reflective techniques that can be applied under existing software engineering considerations to yield a new approach to programming language design that meets a broad set of design criteria.One of the major benefits of including the metaobject protocol in programming languages is that it allows users to adjust the language to better suit their needs. Metaobject protocols also disprove the adage that adding more flexibility to a programming language reduces its performance. In presenting the principles of metaobject protocols, the authors work with actual code for a simplified implementation of CLOS and its metaobject protocol, providing an opportunity for the reader to gain hands-on experience with the design process. They also include a number of exercises that address important concerns and open issues.Gregor Kiczales and Jim des Rivières, are Members of the Research Staff, and Daniel Bobrow is a Research Fellow, in the System Sciences Laboratory at Xerox Palo Alto Research Center.
Patrick Henry Winston
The Knowledge You Need Each section adds new capabilities to a short, yet representative Smalltalk program. One such program displays the calorie content of a food selected by a button click. As you see the program evolve, you learn how to experiment using the workspace and the transcript, benefit from procedure abstraction, define classes that inherit instance variables and methods, benefit from data abstraction, design classes and class hierarchies, store values in class variables, store values in dictionaries, work with arrays and collections, use time-sorted collections in simulations, work with dates and times, program defensively, exchange software, create points and rectangles, draw lines and display text in windows, connect display elements, display list boxes, menus, and file dialog windows, develop a graphical user interface using a GUI builder, work with an industrial-strength smalltalk, work with the model-viewer-controler paradigm, and much, much more. Winstons proven approach * Based on extensive teaching experience * Features easily digested segments * Illustrates ideas via short, yet complete, programs * Answers your natural questions in a natural order * Stresses p