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Private row types: Abstracting the unnamed. (English) Zbl 1168.68351
Kobayashi, Naoki (ed.), Programming languages and systems. 4th Asian symposium, APLAS 2006, Sydney, Australia, November 8–10, 2006. Proceedings. Berlin: Springer (ISBN 978-3-540-48937-5/pbk). Lecture Notes in Computer Science 4279, 44-60 (2006).
Summary: In addition to traditional record and variant types, Objective Caml has structurally polymorphic types, for objects and polymorphic variants. These types allow new forms of polymorphic programming, but they have a limitation when used in combination with modules: there is no way to abstract their polymorphism in a signature. Private row types remedy this situation: they are manifest types whose “row-variable” is left abstract, so that an implementation may instantiate it freely. They have useful applications even in the absence of functors. Combined with recursive modules, they provide an original solution to the expression problem.
For the entire collection see [Zbl 1133.68007].
MSC:
68N18 Functional programming and lambda calculus
68N15 Theory of programming languages
Software:
OCaml
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