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Exposing Discriminaed Unions from F# to C#
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| using System; | |
| using FsLibrary; | |
| namespace CsConsumer | |
| { | |
| public static class Program | |
| { | |
| public static void Main(string[] _) | |
| { | |
| var msg = Vsn.DefaultScheme.Either( | |
| unknown: () => "Unknown", | |
| serial: rev => $"r{rev}", | |
| semantic: (m, n, p) => $"v{m}.{n}.{p}" | |
| ) | |
| Console.WriteLine(msg); | |
| } | |
| } | |
| } |
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| namespace FsLibrary | |
| type Vsn = { | |
| Scheme : VsnScheme | |
| Suffix : string option | |
| } with | |
| static member DefaultSchema = VsnScheme.Unknown | |
| and VsnScheme = | |
| | Unknown | |
| | Serial of revision : uint64 | |
| | Semantic of major : byte * minor : byte * patch : byte | |
| // it's often useful to group the "C#-facing" API into separate components | |
| [<Extension>] | |
| type VsnExtensions = | |
| [<Extension>] | |
| static member Either | |
| ( | |
| scheme : VsnScheme, | |
| unknown : Func<'T>, | |
| serial : Func<uint64, 'T>, | |
| semantic : FromSemanticVsn<'T> // in addition to common delegates, using named delegates is also an option | |
| ) = | |
| // null checks elided for clarity | |
| match me with | |
| | Unknown -> unknown.Invoke() | |
| | Serial revision -> serial.Invoke(revision) | |
| | Semantic (m, n, p) -> semantic.Invoke(m, n, p) | |
| and FromSemanicVsn<'T> = delegate of (byte * byte * byte) -> 'T |
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