From ed00df445dcbca77c44175b5811e2d7ca20d1605 Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <rmlarsen@google.com>
Date: Thu, 9 Jul 2020 19:52:44 +0000
Subject: Guard operator<< by EIGEN_NO_IO.

---
 Eigen/src/Geometry/Quaternion.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'Eigen/src/Geometry')

diff --git a/Eigen/src/Geometry/Quaternion.h b/Eigen/src/Geometry/Quaternion.h
index bebfca422..61f6d0a2b 100644
--- a/Eigen/src/Geometry/Quaternion.h
+++ b/Eigen/src/Geometry/Quaternion.h
@@ -211,10 +211,12 @@ class QuaternionBase : public RotationBase<Derived, 3>
   }
   #endif
 
+#ifndef EIGEN_NO_IO
   friend std::ostream& operator<<(std::ostream& s, const QuaternionBase<Derived>& q) {
     s << q.x() << "i + " << q.y() << "j + " << q.z() << "k" << " + " << q.w();
     return s;
   }
+#endif
 
 #ifdef EIGEN_QUATERNIONBASE_PLUGIN
 # include EIGEN_QUATERNIONBASE_PLUGIN
-- 
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