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Add eqSomeTypeRep

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This commit is contained in:
Anupam Jain 2021-04-22 17:38:16 +05:30
parent caa61a0882
commit 583a5340ef
1 changed files with 7 additions and 1 deletions
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8
src/Data/Typeable.purs
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@ -15,6 +15,7 @@ module Data.Typeable
, SomeTypeRep(..)
, wrapSomeTypeRep
, unwrapSomeTypeRep
, eqSomeTypeRep
, ProxyT, proxyT
, class TagT, tagT
) where
@ -83,13 +84,18 @@ typeRepFromVal _ = typeRep
-- | Unindexed typereps
data SomeTypeRep = SomeTypeRep (Exists TypeRep)
-- | Wrap a TypeRep into a SomeTypeRep
wrapSomeTypeRep :: forall a. TypeRep a -> SomeTypeRep
wrapSomeTypeRep t = SomeTypeRep (mkExists t)
-- | Unwrap a TypeRep
-- | Extract a TypeRep from a SomeTypeRep
unwrapSomeTypeRep :: forall r. SomeTypeRep -> (forall a. TypeRep a -> r) -> r
unwrapSomeTypeRep (SomeTypeRep e) f = e # runExists f
-- | Compare unindexed typereps
eqSomeTypeRep :: SomeTypeRep -> SomeTypeRep -> Boolean
eqSomeTypeRep s1 s2 = unwrapSomeTypeRep s1 \t1 -> unwrapSomeTypeRep s2 \t2 -> eqTypeRep t1 t2
-- MACHINERY + INSTANCES
foreign import typeRepDefault0 :: forall a. TagT a => TypeRep a