Cecil is a pure

object-oriented Object-oriented programming (OOP) is a programming paradigm based on the concept of " objects", which can contain data and code. The data is in the form of fields (often known as attributes or ''properties''), and the code is in the form of ...

programming language A programming language is a system of notation for writing computer programs. Most programming languages are text-based formal languages, but they may also be graphical. They are a kind of computer language. The description of a programming l ...

that was developed by Craig Chambers at the

University of Washington The University of Washington (UW, simply Washington, or informally U-Dub) is a public research university in Seattle, Washington. Founded in 1861, Washington is one of the oldest universities on the West Coast; it was established in Seat ...

in 1992 to be part of the Vortex project there. Cecil has many similarities to other object-oriented languages, most notably

Objective-C Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. Originally developed by Brad Cox and Tom Love in the early 1980s, it was selected by NeXT for its N ...

, Modula-3, and

Self The self is an individual as the object of that individual’s own reflective consciousness. Since the ''self'' is a reference by a subject to the same subject, this reference is necessarily subjective. The sense of having a self—or ''selfhood ...

. The main goals of the project were

extensibility Extensibility is a software engineering and systems design principle that provides for future growth. Extensibility is a measure of the ability to extend a system and the level of effort required to implement the extension. Extensions can be th ...

, orthogonality, efficiency, and ease-of-use. The language supports multiple dispatch and multimethods, dynamic

inheritance Inheritance is the practice of receiving private property, titles, debts, entitlements, privileges, rights, and obligations upon the death of an individual. The rules of inheritance differ among societies and have changed over time. Offici ...

, and optional

static type checking In computer programming, a type system is a logical system comprising a set of rules that assigns a property called a type to every "term" (a word, phrase, or other set of symbols). Usually the terms are various constructs of a computer progra ...

. 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 In computer science, message passing is a technique for invoking behavior (i.e., running a program) on a computer. The invoking program sends a message to a process (which may be an actor or object) and relies on that process and its supporti ...

, and the language supports run-time class identification. These features allow Cecil to support dynamic,

exploratory programming Exploratory programming, as opposed to implementation (programming), is an important part of the software engineering cycle: when a domain is not very well understood or open-ended, or it's not clear what algorithms and data structures might be nee ...

styles. Parameterized types and methods (

generics Generic or generics may refer to: In business * Generic term, a common name used for a range or class of similar things not protected by trademark * Generic brand, a brand for a product that does not have an associated brand or trademark, other ...

polymorphism Polymorphism, polymorphic, polymorph, polymorphous, or polymorphy may refer to: Computing * Polymorphism (computer science), the ability in programming to present the same programming interface for differing underlying forms * Ad hoc polymorphis ...

), garbage collection, and

delegation Delegation is the assignment of authority to another person (normally from a manager to a subordinate) to carry out specific activities. It is the process of distributing and entrusting work to another person,Schermerhorn, J., Davidson, P., Poole ...

are also supported. Cecil also supports a module mechanism for isolating independent libraries or packages. Cecil does not presently support threads or any other form of concurrency. A standard library for Cecil is also available and includes various collection, utility, system, I/O, and GUI classes. The Diesel language was the successor of Cecil. There was also an assembler type language known as CESIL (Computer Education in Schools Instructional Language) used in the late-1970s developed by ICL. It was quite similar to the later language MASM.

References

External links

UW Cecil Group: Home
Official webpage

Dynamically typed programming languages Object-oriented programming languages Prototype-based programming languages {{compu-lang-stub