Created
January 29, 2012 11:08
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obj list型のxsをtのlistにするコード(tはSystem.Typeオブジェクト)
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| open Microsoft.FSharp.Reflection | |
| let listType = typedefof<list<_>>.MakeGenericType([| t |]) | |
| let cases = FSharpType.GetUnionCases(listType) | |
| let nil, cons = cases.[0], cases.[1] | |
| let lst = FSharpValue.MakeUnion(nil, [||]) | |
| let consR x xs = | |
| ref (FSharpValue.MakeUnion(cons, [| x; !xs |])) | |
| !(List.foldBack consR xs (ref lst)) |> unbox |
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