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34 lines
680 B
Idris
34 lines
680 B
Idris
import Data.So
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record Newtype where
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constructor
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MkNewtype
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wrapped : Double
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FromDouble Newtype where
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fromDouble = MkNewtype
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Show Newtype where
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showPrec p (MkNewtype v) = showCon p "MkNewtype" $ showArg v
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record InUnit where
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constructor MkInUnit
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value : Double
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0 inBounds : So (0 <= value && value <= 1)
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Show InUnit where
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showPrec p (MkInUnit v _) = showCon p "MkInUnit" $ showArg v ++ " _"
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namespace InUnit
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public export
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fromDouble : (v : Double)
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-> {auto 0 prf : So (0 <= v && v <= 1)}
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-> InUnit
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fromDouble v = MkInUnit v prf
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main : IO ()
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main = do printLn $ the InUnit 0.25
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printLn $ the Newtype 123.456
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