2 files changed, 22 insertions, 0 deletions
diff --git a/src/Data/Array/Nested/Shaped/Base.hs b/src/Data/Array/Nested/Shaped/Base.hs
index 74c231d..8f41455 100644
--- a/src/Data/Array/Nested/Shaped/Base.hs
+++ b/src/Data/Array/Nested/Shaped/Base.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE FlexibleContexts #-}
@@ -49,13 +50,18 @@ import Data.Array.Strided.Arith
 -- 'Shaped' is a newtype around a 'Mixed' of 'Just's.
 type Shaped :: [Nat] -> Type -> Type
 newtype Shaped sh a = Shaped (Mixed (MapJust sh) a)
+#ifdef OXAR_DEFAULT_SHOW_INSTANCES
+deriving instance Show (Mixed (MapJust sh) a) => Show (Shaped sh a)
+#endif
 deriving instance Eq (Mixed (MapJust sh) a) => Eq (Shaped sh a)
 deriving instance Ord (Mixed (MapJust sh) a) => Ord (Shaped sh a)
 
+#ifndef OXAR_DEFAULT_SHOW_INSTANCES
 instance (Show a, Elt a) => Show (Shaped n a) where
   showsPrec d arr@(Shaped marr) =
     let sh = show (shsToList (sshape arr))
     in showsMixedArray ("sfromListLinear " ++ sh) ("sreplicate " ++ sh) d marr
+#endif
 
 instance Elt a => NFData (Shaped sh a) where
   rnf (Shaped arr) = rnf arr
@@ -63,6 +69,9 @@ instance Elt a => NFData (Shaped sh a) where
 -- just unwrap the newtype and defer to the general instance for nested arrays
 newtype instance Mixed sh (Shaped sh' a) = M_Shaped (Mixed sh (Mixed (MapJust sh') a))
   deriving (Generic)
+#ifdef OXAR_DEFAULT_SHOW_INSTANCES
+deriving instance Show (Mixed sh (Mixed (MapJust sh') a)) => Show (Mixed sh (Shaped sh' a))
+#endif
 
 deriving instance Eq (Mixed sh (Mixed (MapJust sh') a)) => Eq (Mixed sh (Shaped sh' a))
 
diff --git a/src/Data/Array/Nested/Shaped/Shape.hs b/src/Data/Array/Nested/Shaped/Shape.hs
index 092465f..59a7d61 100644
--- a/src/Data/Array/Nested/Shaped/Shape.hs
+++ b/src/Data/Array/Nested/Shaped/Shape.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveFoldable #-}
 {-# LANGUAGE DeriveFunctor #-}
@@ -58,8 +59,12 @@ deriving instance (forall n. Eq (f n)) => Eq (ListS sh f)
 deriving instance (forall n. Ord (f n)) => Ord (ListS sh f)
 infixr 3 ::$
 
+#ifdef OXAR_DEFAULT_SHOW_INSTANCES
+deriving instance (forall n. Show (f n)) => Show (ListS sh f)
+#else
 instance (forall n. Show (f n)) => Show (ListS sh f) where
   showsPrec _ = listsShow shows
+#endif
 
 instance (forall m. NFData (f m)) => NFData (ListS n f) where
   rnf ZS = ()
@@ -201,8 +206,12 @@ infixr 3 :.$
 
 type IIxS sh = IxS sh Int
 
+#ifdef OXAR_DEFAULT_SHOW_INSTANCES
+deriving instance Show i => Show (IxS sh i)
+#else
 instance Show i => Show (IxS sh i) where
   showsPrec _ (IxS l) = listsShow (\(Const i) -> shows i) l
+#endif
 
 instance Functor (IxS sh) where
   fmap f (IxS l) = IxS (listsFmap (Const . f . getConst) l)
@@ -280,8 +289,12 @@ infixr 3 :$$
 
 {-# COMPLETE ZSS, (:$$) #-}
 
+#ifdef OXAR_DEFAULT_SHOW_INSTANCES
+deriving instance Show (ShS sh)
+#else
 instance Show (ShS sh) where
   showsPrec _ (ShS l) = listsShow (shows . fromSNat) l
+#endif
 
 instance NFData (ShS sh) where
   rnf (ShS ZS) = ()