TOOL (Tiny Object Oriented Language) is an easily-embedded, object-Oriented, C++-like-language interpreter. The language, and indeed a significant part of the core of the TOOL engine, is based on the BOB project, a work that was originally developed by David Betz covered in previously published issues of Dr. Dobb s Journal.
ET++ is a portable and homogenous object-Oriented class library integrating user
interface building blocks, basic data structures, and high level application framework
components. ET++ eases the building of highly interactive applications with consistent
user interfaces following the direct manipulation principle. The ET++ class library is
implemented in C++ and can be used on several operating systems and window system
platforms. Since its initial conception the class library has been continuously
redesigned and improved. It started with an architecture which was close to MacApp.
During several iterations a new and unique architecture evolved. A byproduct of the
ET++ project is a set of tools, which were designed to support the exploration of ET++
applications at run-time.
設計模式一書引用的主要參考例程，一個跨平臺的應用框架，基于C++實現，是學習面向對象的經典源碼.
object-Oriented languages
define objects (types of things) that know how to perform methods (specific actions).
Functional languages treat programming problems like mathematical relationships.
Ruby is flexible, meaning that you can program in any of these styles however, it is
primarily object oriented, with some strong functional influence. This book focuses
slightly more on the functional aspects of Ruby than some other books.
