Fix bug in outerproducts for tensormaps

Author: romeric

Fastor/tensor_algebra/outerproduct.h

@@ -98,7 +98,7 @@ dyadic(const AbstractTensor<Derived0,DIM0> &a, const AbstractTensor<Derived1,DIM
 // }
 
 template<typename AbstractTensorType0, typename AbstractTensorType1, typename ... AbstractTensorTypes,
-    enable_if_t_<is_greater_equal_v_<sizeof...(AbstractTensorTypes),1>,bool> >
+    enable_if_t_<is_greater_equal_v_<sizeof...(AbstractTensorTypes),1>,bool> = false >
 FASTOR_INLINE
 auto
 outer(const AbstractTensorType0& a, const AbstractTensorType1& b, const AbstractTensorTypes& ... rest)
@@ -108,7 +108,7 @@ outer(const AbstractTensorType0& a, const AbstractTensorType1& b, const Abstract
 }
 
 template<typename AbstractTensorType0, typename AbstractTensorType1, typename ... AbstractTensorTypes,
-    enable_if_t_<is_greater_equal_v_<sizeof...(AbstractTensorTypes),1>,bool> >
+    enable_if_t_<is_greater_equal_v_<sizeof...(AbstractTensorTypes),1>,bool> = false >
 FASTOR_INLINE
 auto
 dyadic(const AbstractTensorType0& a, const AbstractTensorType1& b, const AbstractTensorTypes& ... rest)