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February 16, 2020 13:27
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F#: SRTP + AP
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| let inline (|HasLength|) x = | |
| fun () -> (^a: (member Length: int) fst x) | |
| let inline (|HasMethod|) x = | |
| fun () -> (^a: (member Method: int with get) snd x) | |
| let inline length (HasLength f1 & HasMethod f2) = | |
| let a = f1() | |
| let b = f2() | |
| a + b | |
| type IMethod = | |
| abstract member Method : int with get | |
| let o = | |
| { new IMethod with member x.Method = 1 } | |
| printfn "%A" (length ([1], o)) |
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