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Extract unitless quantities #71

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Extract unitless quantities #71

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3 changes: 3 additions & 0 deletions units-test/Tests/Compile/Quantity.hs
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Expand Up @@ -25,6 +25,9 @@ force1 = 10 % Joule
force2 = fromQuantity force1
force3 = toQuantity force1

ratio :: Double
ratio = extract $ len2 |/| len3

newtype MyTime = MyTime { getTime :: Double } -- measured in seconds

instance Quantity MyTime where
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2 changes: 1 addition & 1 deletion units/Data/Metrology/Poly.hs
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Expand Up @@ -80,7 +80,7 @@ module Data.Metrology.Poly (
Canonical,

-- * Numbers, the only built-in unit
Dimensionless(..), Number(..), Count, quantity,
Dimensionless(..), Number(..), Count, quantity, extract,

-- * LCSUs (locally coherent system of units)
MkLCSU, LCSU(DefaultLCSU), DefaultUnitOfDim,
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4 changes: 4 additions & 0 deletions units/Data/Metrology/Qu.hs
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Expand Up @@ -94,6 +94,10 @@ type MkQu_ULN unit = Qu (DimFactorsOf (DimOfUnit unit))
quantity :: n -> Qu '[] l n
quantity = Qu

-- | Extract a untless dimensioned quantity.
extract :: Qu '[] l n -> n
extract = coerce

---------------------------------------
-- Multiplicative operations
---------------------------------------
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2 changes: 1 addition & 1 deletion units/Data/Metrology/Vector.hs
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Expand Up @@ -75,7 +75,7 @@ module Data.Metrology.Vector (
Canonical,

-- * Numbers, the only built-in unit
Dimensionless(..), Number(..), Count, quantity,
Dimensionless(..), Number(..), Count, quantity, extract,

-- * LCSUs (locally coherent system of units)
MkLCSU, LCSU(DefaultLCSU), DefaultUnitOfDim,
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