Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cecil is a pure object-oriented programming language that was developed by Craig Chambers at the University of Washington in 1992 to be part of the Vortex project there. Cecil has many similarities to other object-oriented languages, most notably Objective-C, Modula-3, and Self. The main goals of the project were extensibility, orthogonality, efficiency, and ease-of-use. The language supports multiple dispatch and multimethods, dynamic inheritance, and optional static type checking. Unlike most other OOP systems, Cecil allows subtyping and code inheritance to be used separately, allowing run-time or external extension of object classes or instances. Like Objective-C, all object services in Cecil are invoked by message passing, and the language supports run-time class identification.

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