abstract class

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abstract class

(programming)
In object-oriented programming, a class designed only as a parent from which sub-classes may be derived, but which is not itself suitable for instantiation. Often used to "abstract out" incomplete sets of features which may then be shared by a group of sibling sub-classes which add different variations of the missing pieces.

abstract class

Also called an "abstract superclass," in object technology, it is a class created as a master structure. No objects of an abstract class are created, rather subclasses of the abstract class are defined with their own variations, and the subclasses are used to create the actual objects.
References in periodicals archive ?
IP can enable an abstract type of redundancy that is just not possible with any other technology.
Formally, if there are n implementing classes of a super type and the n extracted typstates parts are Mr = ([Q.sub.1], E, [S.sub.1], [[lambda].sub.1], [S.sub.1], [F.sub.1]), ..., [M.sub.n] = ([Q.sub.n], E, [[delta].sub.n], [[lambda].sub.n], [S.sub.n], [F.sub.n]), we define the protocol of the abstract type M = (Q, [SIGMA], [delta], [lambda], S, F),where
First, we introduce the abstract type Element representing all the elements in the repository: data, resources, properties and statements.
Soon, however, he began to focus in his paintings on the composition and structure of the individual coloured surfaces, and in 1963 this line of development culminated in compositions of a geometrically abstract type in the form of colour structures of abstracted signs.
Consider a host-provided interface for an abstract type of file handles, fh, that includes operations to create and use them (Figure 1).
This section introduces, step by step, an abstract type to support interaction, called a monad.
Beethoven's music is, inter alia, an expression of romanticism and no abstract type pre-dating the foundation of the world can have that expressive character.
In a class, we can specify types: build-in types, abstract type (sorts), and compound types (x for Cartesian Product, -set for Set, * for List, [??] for Maps, Records, Variants).
If the member functions needed for the abstract type are nonvirtual member functions, introducing an abstract superclass is not possible either, since it would modify the behavior.
Because Ada is so supportive of abstract type definitions, it was relatively easy to produce an Ada language binding.
[1] According to the Tate Museum, biomorphic--derived from the Greek words "bios," which means life, and "morphe," which means form--was initially used during the 1930s "to describe the imagery in the more abstract types of surrealist painting and sculpture" (http://www.tate.org.uk/art/art-terms/b/biomorphic).
The plot is schematic and the characters--even the principal figure, Santiago the shepherd boy--are abstract types. The narrative takes place in identifiable places (Andalusia, Tangier, the pyramids of Egypt), but they are not realized with even a minimum degree of particularity, and the time frame is vaguely preindustrial (there are undifferentiated castles and the Moors have been expelled from the Iberian peninsula).