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Define a Foldable instance for Term.

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This commit is contained in:
Rob Rix 2017-09-09 12:02:11 +01:00
parent a358be60cc
commit ce02539dab
1 changed files with 3 additions and 0 deletions
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src/Term.hs
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@ -74,6 +74,9 @@ instance Functor f => Comonad (Term f) where
instance Functor f => Functor (Term f) where
fmap f = go where go (Term (a :< r)) = Term (f a :< fmap go r)
instance Foldable f => Foldable (Term f) where
foldMap f = go where go (Term (a :< r)) = f a `mappend` foldMap go r
instance Functor f => ComonadCofree f (Term f) where
unwrap (Term (_ :< as)) = as
{-# INLINE unwrap #-}