From 2112a3641aa50dbcf3dd6dd05258fe9d616fd0d1 Mon Sep 17 00:00:00 2001
From: Simon Giraudot <simon.giraudot@geometryfactory.com>
Date: Thu, 12 Mar 2020 10:37:23 +0100
Subject: [PATCH] Add missing inheritance to
 Eigen::NumTraits<CGAL::Sqrt_extension<...> >

---
 Number_types/include/CGAL/Sqrt_extension/Eigen_NumTraits.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Number_types/include/CGAL/Sqrt_extension/Eigen_NumTraits.h b/Number_types/include/CGAL/Sqrt_extension/Eigen_NumTraits.h
index b51e888839a..5725578ec46 100644
--- a/Number_types/include/CGAL/Sqrt_extension/Eigen_NumTraits.h
+++ b/Number_types/include/CGAL/Sqrt_extension/Eigen_NumTraits.h
@@ -14,10 +14,15 @@
 #ifndef CGAL_SQRT_EXTENSION_EIGEN_NUMTRAITS_H
 #define CGAL_SQRT_EXTENSION_EIGEN_NUMTRAITS_H
 
+#ifdef CGAL_EIGEN3_ENABLED
+
+#include <Eigen/src/Core/NumTraits.h>
+
 namespace Eigen {
   template<class> struct NumTraits;
   template <class NT,class ROOT, class ACDE_TAG, class FP_TAG>
   struct NumTraits<CGAL::Sqrt_extension<NT, ROOT, ACDE_TAG, FP_TAG> >
+    : GenericNumTraits<CGAL::Sqrt_extension<NT, ROOT, ACDE_TAG, FP_TAG> >
   {
     typedef CGAL::Sqrt_extension<NT, ROOT, ACDE_TAG, FP_TAG> Real;
     typedef Real NonInteger;
@@ -38,4 +43,6 @@ namespace Eigen {
   };
 }
 
+#endif // CGAL_EIGEN3_ENABLED
+
 #endif