How did CLU revolutionize programming? This paper introduces the groundbreaking abstraction mechanisms in the CLU programming language, designed to enhance program construction. It emphasizes the use of procedural, control, and data abstractions. Unlike conventional languages that primarily support procedural abstractions through procedures or subroutines, CLU offers novel linguistic tools that foster data and control abstractions. The paper illustrates the utility of these three types of abstractions with programming examples, demonstrating how CLU programs can effectively utilize and implement them. It delves into the implementation of abstractions, detailing how programs are written to maximize their potential. The authors explore how CLU streamlines program development and simplifies code management. The discussion also covers the CLU library, highlighting its support for incremental program development and the complete type checking performed at compile time. This library allows developers to expand programs gradually, ensuring reliability and preventing errors. The study significantly impacts software engineering, providing valuable insights into creating more robust and efficient programming languages.
Published in Communications of the ACM, a leading journal in computer science, this paper on CLU's abstraction mechanisms directly addresses the journal's focus on advancements in programming languages and software engineering. The paper's exploration of data and control abstractions aligns with the journal's interest in promoting innovative approaches to software development, solidifying its significance within the ACM community.