Open AccessType Abstraction Rules for References: A Comparison of Four which have Achieved Notoriety
Author(s) -
Jr O'Toole,
W. James
Publication year - 1991
Publication title -
citeseer x (the pennsylvania state university)
Language(s) - English
Resource type - Reports
DOI - 10.21236/ada240076
Subject(s) - abstraction , computer science , programming language , information retrieval , epistemology , philosophy
: I present four type abstraction rules which have been introduced by various authors to permit polymorphic type safety in the presence of mutable data. Each of the type abstraction rules is discussed in the context of the language in which is was introduced, and the various abstraction rules are compared.
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