From f8bfe1061398f03b97a6313dd85dffc41454ee64 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Sun, 6 Nov 2016 15:20:30 +0100
Subject: [PATCH] Add missing friend declaration

---
 Eigen/src/SparseCore/SparseMatrix.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Eigen/src/SparseCore/SparseMatrix.h b/Eigen/src/SparseCore/SparseMatrix.h
index 64ca5fc44..ec650b270 100644
--- a/Eigen/src/SparseCore/SparseMatrix.h
+++ b/Eigen/src/SparseCore/SparseMatrix.h
@@ -94,6 +94,7 @@ class SparseMatrix
 {
     typedef SparseCompressedBase<SparseMatrix> Base;
     using Base::convert_index;
+    friend class SparseVector<_Scalar,0,_Index>;
   public:
     using Base::isCompressed;
     using Base::nonZeros;