mcintyre321/OneOf

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

4054 stars · 164 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

OneOf is a C# library providing F#-style discriminated unions via a generic OneOf<T0,...,Tn> type with exhaustive compile-time matching. It lets methods return strongly typed alternative outcomes without exceptions or base-class hierarchies.

Use cases

• return multiple typed results from a c# method
• avoid exceptions for control flow
• implement option/maybe types in c#
• exhaustive compile-time checked switch handling
• model success or error outcomes with strong types

When to choose

• you write C# and want F#-like discriminated unions
• you want method signatures that force callers to handle every outcome
• you want to replace exception-based control flow with typed error values

When to avoid

• you work outside the .NET ecosystem
• your team prefers traditional polymorphism or exception handling
• you need runtime-open unions with dynamically extensible cases

Facets

library · maturity active

type-system error-handling programming-languages developer-tools dotnet cross-platform discriminated-unions csharp result-types pattern-matching functional-programming

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