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Add the ByteSize measure #490

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db6a46d
measures: remove Eq superclass
nfrisby Jul 3, 2024
0b2d44b
measures: add Bounded deriver
nfrisby Jul 3, 2024
f054c2d
measures: add ByteSize
nfrisby Jul 3, 2024
8defee1
measures: update CHANGELOG.md
nfrisby Jul 3, 2024
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9 changes: 7 additions & 2 deletions measures/CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,8 +1,13 @@
# Changelog for `measures`

## 0.1.0.3
## 0.2.0.0

*
* Removed `Eq` superclass from `Measure`. I now see some types can not and/or
should not provide it.

* Added a `Bounded` instance for `Measure` instances.

* Added the `ByteSize` measure.

## 0.1.0.2

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6 changes: 6 additions & 0 deletions measures/measures.cabal
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Expand Up @@ -29,10 +29,16 @@ library

exposed-modules:
Data.Measure
Data.Measure.ByteSize
Data.Measure.Class

build-depends: base
, base-deriving-via
, cardano-binary
, cardano-strict-containers
, deepseq
, nothunks
, quiet

test-suite test
hs-source-dirs: test
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10 changes: 5 additions & 5 deletions measures/src/Data/Measure.hs
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Expand Up @@ -32,21 +32,21 @@ infix 4 <=, >=
--
-- It's only true if every component on the left is @<=@ the corresponding
-- component on the right.
(<=) :: Measure a => a -> a -> Prelude.Bool
(<=) :: (Prelude.Eq a, Measure a) => a -> a -> Prelude.Bool
x <= y = x Prelude.== min x y

-- | The partial order induced by 'max'
--
-- It's only true if every component on the left is @>=@ the corresponding
-- component on the right.
(>=) :: Measure a => a -> a -> Prelude.Bool
(>=) :: (Prelude.Eq a, Measure a) => a -> a -> Prelude.Bool
x >= y = x Prelude.== max x y

-- | Split a list once a prefix fills up the given capacity
--
-- Note that this just splits the given list; it does not attempt anything
-- clever like bin-packing etc.
splitAt :: Measure a => (e -> a) -> a -> [e] -> ([e], [e])
splitAt :: (Prelude.Eq a, Measure a) => (e -> a) -> a -> [e] -> ([e], [e])
splitAt measure limit =
go zero []
where
Expand All @@ -60,7 +60,7 @@ splitAt measure limit =
tot' = plus tot (measure e)

-- | @fst . 'splitAt' measure limit@, but non-strict
take :: Measure a => (e -> a) -> a -> [e] -> [e]
take :: (Prelude.Eq a, Measure a) => (e -> a) -> a -> [e] -> [e]
take measure limit =
go zero
where
Expand All @@ -74,7 +74,7 @@ take measure limit =
tot' = plus tot (measure e)

-- | @snd . 'splitAt' measure limit@, with a bit less allocation
drop :: Measure a => (e -> a) -> a -> [e] -> [e]
drop :: (Prelude.Eq a, Measure a) => (e -> a) -> a -> [e] -> [e]
drop measure limit =
go zero
where
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