CLASP

Computer Language for AeronauticS and Programming

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class

<programming> The prototype for an object in an object-oriented language; analogous to a derived type in a procedural language. A class may also be considered to be a set of objects which share a common structure and behaviour. The structure of a class is determined by the class variables which represent the state of an object of that class and the behaviour is given by a set of methods associated with the class.

Classes are related in a class hierarchy. One class may be a specialisation (a "subclass") of another (one of its "superclasses") or it may be composed of other classes or it may use other classes in a client-server relationship. A class may be an abstract class or a concrete class.

See also signature.

<programming> See type class.

<networking> One of three types of Internet addresses distinguished by their most significant bits.

<language> A language developed by the Andrew Project. It was one of the first attempts to add object-oriented features to C.

Last updated: 1995-05-01

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Class 5 switch

<communications> The lowest designation used in AT&T's hierarchical General Toll Switching Plan, developed in 1929.

Last updated: 2013-09-14

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class hierarchy

<programming> A set of classes and their interrelationships.

One class may be a specialisation (a "subclass" or "derived class") of another which is one of its "superclasses" or "base classes".

When a method is invoked on an object it is first looked for in the object's class, then the superclass of that class, and so on up the hierarchy until it is found. Thus a class need only define those methods which are specific to it, and inherits methods from all its superclasses.

See also: multiple inheritance.

Last updated: 1997-08-06

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classic

<jargon> An adjective used before or after a noun to describe the original version of something, especially if the original is considered to be better.

Examples include "Star Trek Classic" - the original TV series as opposed to the films, ST The Next Generation or any of the other spin-offs and follow-ups; or "PC Classic" - IBM's ISA-bus computers as opposed to the PS/2 series.

Last updated: 1996-10-27

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Classic-Ada

<language> An object-oriented extension to Ada, said to be like Smalltalk. It is implemented as an Ada preprocessor.

Last updated: 1994-12-05

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classical logic

<logic> Non-intuitionistic logic.

Last updated: 1995-04-13

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Classic C

K&R C

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Classless Inter-Domain Routing

<networking> (CIDR) /sid*r/ A technique that summarises a block of Internet addresses in a routing table as an address in dotted decimal notation followed by a forward slash and a two-digit decimal number giving the number of leading one bits in the subnet mask. For example, 123.123.123.0/24 specifies a subnet mask of 11111111.11111111.11111111.00000000 (binary), implying the block of addresses 123.123.123.0 through 123.123.123.255.

CIDR is "classless" because it is not limited to the subnet masks specified by Internet address classes A, B and C.

According to RFC 1519, CIDR was implemented to distribute Internet address space more efficiently and to provide a mechanism for IP route aggregation. This in turn reduces the number of entries in IP routing tables, enabling faster, more efficient routing, e.g. using routing protocols such as OSPF. CIDR is supported by BGP4.

See also RFC 1467, RFC 1518, RFC 1520.

Last updated: 2006-01-26

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class library

<programming> A library of reusable classes for use with an object-oriented programming system.

Last updated: 1994-12-05

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class method

<programming> A kind of method, available in some object-oriented programming languages, that operates on the class as a whole, as opposed to an object method that operates on an object that is an instance of the class.

A typical example of a class method would be one that keeps a count of the number of objects of that class that have been created.

Last updated: 2000-03-22

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Class Oriented Ring Associated Language

<language> (CORAL) A language developed by L.G. Roberts at MIT in 1964 for graphical display and systems programming on the TX-2. It used "rings" (circular lists) from Sketchpad.

["Graphical Communication and Control Languages", L.B. Roberts, Information System Sciences: Proc Second Congress, 1965].

[Sammet 1969, p.462].

Last updated: 1994-11-30

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Class-Relation Method

<programming> A design technique based on the concepts of object-oriented programming and the Entity-Relationship model from the French company Softeam.

Last updated: 1994-12-05

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