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test zero to 8 instead of 10 places, workaround for rounding error affecting a real-world transaction

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Simon Michael 2010-05-25 22:17:54 +00:00
parent d52283f314
commit 4120a874d8
1 changed files with 2 additions and 1 deletions
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hledger-lib/Hledger/Data/Amount.hs
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@ -150,7 +150,8 @@ isZeroAmount = null . filter (`elem` "123456789") . showAmountWithoutPrice
-- | Is this amount "really" zero, regardless of the display precision ? -- | Is this amount "really" zero, regardless of the display precision ?
-- Since we are using floating point, for now just test to some high precision. -- Since we are using floating point, for now just test to some high precision.
isReallyZeroAmount :: Amount -> Bool isReallyZeroAmount :: Amount -> Bool
isReallyZeroAmount = null . filter (`elem` "123456789") . printf "%.10f" . quantity isReallyZeroAmount = null . filter (`elem` "123456789") . printf ("%."++show zeroprecision++"f") . quantity
where zeroprecision = 8
-- | Access a mixed amount's components. -- | Access a mixed amount's components.
amounts :: MixedAmount -> [Amount] amounts :: MixedAmount -> [Amount]