DevThe Registerabout 5 hours ago
C# 15 preview brings union types, closed hierarchies
4 min read
Microsoft previewed C# 15, launching in November, with union types, closed hierarchies, and expanded unsafe keyword semantics. Union types unify custom data types into a single compiler-verified contract, improving pattern matching and reducing boilerplate. Closed hierarchies restrict inheritance to the same assembly, blocking third-party subtypes.
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