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Abstract type: In programming languages, an abstract type is a type in a nominative type system which cannot be instantiated directly. Abstract types are also known as existential types. An abstract type may provide no implementation, or an incomplete implementation. Often, abstract types will have one or more implementations provided separately, for example, in the form of concrete subclasses which can be instantiated. It may include abstract methods or abstract properties that are shared by its subtypes.
Printed dictionaries and other books with definitions for Abstract type
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Language and Standard Libraries by Tucker S. Taft, Robert A. Duff, Randall L. Brukardt, Erhard Ploedereder
An abstract type is a tagged type intended for use as a parent type for type extensions, but which is not allowed to have objects of its own.
Legality Rules An abstract type is a specific type that has the reserved word abstract in its declaration.
Ada for Software Engineers (2009)
by Mordechai Ben-Ari
Frequently, an abstract type is declared as a null record. The abstract primitive subprograms serve as ancestors of the concrete primitive subprograms that will be declared upon derivation. §3.9.3 1 An abstract type is a tagged type intended for ...
Programming in Ada 2012 (2014)
by John Barnes
Abstract type An abstract type is a tagged type intended for use as an ancestor of other types, but which is not allowed to have objects of its own. Access type An access type has values that designate aliased objects. Access types correspond ...
International Standard ISO/IEC 8652/2012 (E) by S. Tucker Taft, Robert A. Duff, Randall L. Brukardt, Erhard Ploedereder, Pascal Leroy, Edmond Schonberg
An abstract type is a tagged type intended for use as an ancestor of other types, but which is not allowed to have objects of its own. An abstract subprogram is a subprogram that has no body, but is intended to be overridden at some point when ...
International Standard ISO/IEC 8652:1995 (E) by Tucker S. Taft, Robert A. Duff
Legality Rules An abstract type is a specific type that has the reserved word abstract in its declaration. Only a tagged type is allowed to be declared abstract. A subprogram declared by an abstract_subprogram_declaration (see 6.1) is an ...
Dictionary of E-Business (2003)
A Definitive Guide to Technology and Business Terms by Francis Botto
abstract type A definition in a property list that gives characteristics of documents. Accelerator 1. A graphics card offering high-speed operation and optimised for GUIs like X-Windows, Windows and OS/ 2.
by Dieter Wunderlich
Implicit in the distinction of these types is the claim that they can neither be reduced to each other nor regarded as subtypes of a more comprehensive or abstract type. Only the positional type could in some sense be related to the accusative ...
by Khosrow-Pour, Mehdi
By applying IT1_abstract_type rule we obtain the abstract type field.
For Information and Communication Technologies and Related Areas by J. Vlietstra
AT&T Wireless Services ATU Analog Trunk Unit ATU Analysis and Transformation Unit ATV Account Transfer Voucher ATW Accumulator Track Write a-type abstract type AU Access | Adder Unit AU Adaptive|Administrative Unit AU Additional ...
Language Typology and Syntactic Description: Volume 3, Grammatical Categories and the Lexicon (2007)
by Timothy Shopen
Unexpressed subjects In apparently all languages with action nominalizations, it is possible to leave the subject unexpressed, the nominalization then referring to an abstract type of activity or state, as in English ( 175). (175) a.
by Ian Chilvers
an obvious social purpose: they thought that 'fine art' could make an important contribution to society by being spiritually uplifting and they conceived a purely abstract type of sculpture that used industrial materials such as plastic and glass.
by Norbert M. Seel
The abstraction of unlocking all doors by using a key describes an even more abstract type of behavior. The more abstract the description of a subject of learning is, the more problems of misunderstanding may occur. Take as an example: ...
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