In F#, given
type MyType = A | B | C | D | E | F | G
How do I randomly define an instance of MyType?
Select a random number, then pattern match that number with different branches returning a different instant?
This ought to work:
let randInst< t>() =
let cases = Reflection.FSharpType.GetUnionCases(typeof< t>)
let index = System.Random().Next(cases.Length)
let case = cases.[index]
Reflection.FSharpValue.MakeUnion(case, [||]) :?> t
This code assumes that the union cases are all nullary and that the type you re using is actually a union type, but it would be easy to explicitly check those assumptions and throw meaningful exceptions if desired.
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