From f8976fdbe0f87f6b2e3e09191ed0f268cc38d8e3 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 2 Sep 2015 21:39:49 +0200
Subject: [PATCH] Make evaluators non-copyable. This guarantee that evaluators
 storing temporaries do not introduce unwanted copy overhead.

---
 Eigen/src/Core/CoreEvaluators.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Eigen/src/Core/CoreEvaluators.h b/Eigen/src/Core/CoreEvaluators.h
index 1541f940e..9b6a442e5 100644
--- a/Eigen/src/Core/CoreEvaluators.h
+++ b/Eigen/src/Core/CoreEvaluators.h
@@ -96,7 +96,7 @@ struct evaluator<const T>
 // ---------- base class for all evaluators ----------
 
 template<typename ExpressionType>
-struct evaluator_base
+struct evaluator_base : public noncopyable
 {
   // TODO Check whether nestedType is really needed:
   //      As long as evaluator are non-copyable, there is no reason to make it different.