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  1. Transactions on Programming Languages and Systems (TOPLAS)
  2. ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 10
  3. Issue 2, April 1988
  4. Type extensions
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ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 38
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 37
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 36
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 35
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 34
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 33
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 32
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 31
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 30
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 29
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 28
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 27
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 26
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 25
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 24
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 23
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 22
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 21
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 20
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 19
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 18
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 17
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 16
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 15
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 14
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 13
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 12
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 11
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 10
Issue 4, Oct 1988
Issue 3, July 1988
Issue 2, April 1988
An Ada package for dimensional analysis
Type extensions
Abstract interaction tools: a language for user interface management systems
ACE: an automatic complexity evaluator
Control predicates are better than dummy variables for reasoning about program control
Efficient and correct execution of parallel programs that share memory
Simple, efficient, asynchronous parallel algorithms for maximization
On the (non-) relationship between SLR(1) and NQLALR(1) grammars
Issue 1, Jan 1988
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 9
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 8
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 7
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 6
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 5
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 4
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 3
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 2
ACM Transactions on Programming Languages and Systems (TOPLAS) : Volume 1

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Type extensions

Content Provider ACM Digital Library
Author Wirth, N.
Copyright Year 1988
Abstract Software systems represent a hierarchy of modules. Client modules contain sets of procedures that extend the capabilities of imported modules. This concept of extension is here applied to data types. Extended types are related to their ancestor in terms of a hierarchy. Variables of an extended type are compatible with variables of the ancestor type. This scheme is expressed by three language constructs only: the declaration of extended record types, the type test, and the type guard. The facility of extended types, which closely resembles the class concept, is defined in rigorous and concise terms, and an efficient implementation is presented.
Starting Page 204
Ending Page 214
Page Count 11
File Format PDF
ISSN 01640925
e-ISSN 15584593
DOI 10.1145/42190.46167
Volume Number 10
Issue Number 2
Journal ACM Transactions on Programming Languages and Systems (TOPLAS)
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 1988-04-01
Publisher Place New York
Access Restriction One Nation One Subscription (ONOS)
Content Type Text
Resource Type Article
Subject Software
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