From cfe315476f3633d2c9481a56bf6791a25f79f597 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Mon, 28 Sep 2015 15:51:00 +0200
Subject: [PATCH] Add PlainObjectBase copy ctor from PlainObjectBase and
 DenseBase objects. (manual backport from default branch, fix segfault when
 creating PlainObjectBase object, though such an usage is not recommended at
 all)

---
 Eigen/src/Core/PlainObjectBase.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Eigen/src/Core/PlainObjectBase.h b/Eigen/src/Core/PlainObjectBase.h
index 8a3e4545a..ffd3a0601 100644
--- a/Eigen/src/Core/PlainObjectBase.h
+++ b/Eigen/src/Core/PlainObjectBase.h
@@ -437,6 +437,22 @@ class PlainObjectBase : public internal::dense_xpr_base<Derived>::type
     }
 #endif
 
+    /** Copy constructor */
+    EIGEN_STRONG_INLINE PlainObjectBase(const PlainObjectBase& other)
+      : m_storage()
+    {
+      _check_template_params();
+      lazyAssign(other);
+    }
+
+    template<typename OtherDerived>
+    EIGEN_STRONG_INLINE PlainObjectBase(const DenseBase<OtherDerived> &other)
+      : m_storage()
+    {
+      _check_template_params();
+      lazyAssign(other);
+    }
+
     EIGEN_STRONG_INLINE PlainObjectBase(Index a_size, Index nbRows, Index nbCols)
       : m_storage(a_size, nbRows, nbCols)
     {