From fbe18d550780195dc18feb896c35a98b111bd190 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 9 Dec 2015 15:47:32 +0100
Subject: Forbid the creation of SparseCompressedBase object

---
 Eigen/src/SparseCore/SparseCompressedBase.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'Eigen/src/SparseCore')

diff --git a/Eigen/src/SparseCore/SparseCompressedBase.h b/Eigen/src/SparseCore/SparseCompressedBase.h
index fb795a0ed..c223e4f42 100644
--- a/Eigen/src/SparseCore/SparseCompressedBase.h
+++ b/Eigen/src/SparseCore/SparseCompressedBase.h
@@ -95,7 +95,12 @@ class SparseCompressedBase
     
     /** \returns whether \c *this is in compressed form. */
     inline bool isCompressed() const { return innerNonZeroPtr()==0; }
-  
+
+  protected:
+    /** Default constructor. Do nothing. */
+    SparseCompressedBase() {}
+  private:
+    template<typename OtherDerived> explicit SparseCompressedBase(const SparseCompressedBase<OtherDerived>&);
 };
 
 template<typename Derived>
-- 
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