This article explores how to encode guarded methods in OCaml using type equality witnesses, since OCaml's syntax doesn't natively support attaching constraints to individual methods. It demonstrates the technique by extending a list class with a guarded flatten method that only applies to lists of lists.
Background
OCaml is a statically-typed functional programming language with strong object-oriented support. The article addresses a common OOP pattern where method-level constraints are desired but not directly supported by the language's type system.
- Source
- Lobsters
- Published
- Aug 2, 2026 at 09:03 PM
- Score
- 6.0 / 10