Expression problem: Difference between revisions

Revision as of 05:42, 5 October 2023

Revision as of 07:43, 5 October 2023

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{{Short description|Data abstraction problem in programming languages}}

The '''expression problem''' is a challenging problem in [[programming language]]s that concerns the extensibility and modularity of statically typed data abstractions. The goal is to define a data abstraction that is extensible both in its representations and its behaviors, where one can add new representations and new behaviors to the data abstraction, without recompiling existing code, and while retaining static type safety (e.g., no casts). The statement of the problem exposes deficiencies in [[programming paradigm]]s and [[programming language]]s, and {{as of|2023|lc=y}} is still considered unsolved,{{cn|date=October 2023}} although there are many proposed solutions.{{cn|reason=feels misleading as if there is some buzz of research interest or activity, whereas in fact most of the references are from 30 years ago|date=October 2023}}

== History ==