From 131db3c552304e1fa2c9438ec71a99ef32eea54e Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 7 Oct 2015 16:37:46 +0200
Subject: [PATCH] Fix return by value versus ref typo in IncompleteCholesky

---
 unsupported/Eigen/src/IterativeSolvers/IncompleteCholesky.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unsupported/Eigen/src/IterativeSolvers/IncompleteCholesky.h b/unsupported/Eigen/src/IterativeSolvers/IncompleteCholesky.h
index 388e6bfaa..29617f2ca 100644
--- a/unsupported/Eigen/src/IterativeSolvers/IncompleteCholesky.h
+++ b/unsupported/Eigen/src/IterativeSolvers/IncompleteCholesky.h
@@ -125,7 +125,7 @@ class IncompleteCholesky : public SparseSolverBase<IncompleteCholesky<Scalar,_Up
     const VectorRx& scalingS() const { return m_scale; }
 
     /** \returns the fill-in reducing permutation P (can be empty for a natural ordering) */
-    const PermutationType permutationP() const { return m_perm; }
+    const PermutationType& permutationP() const { return m_perm; }
 
   protected:
     FactorType m_L;              // The lower part stored in CSC