bug #890, add a more general routine to check that two dense object reference to the same data

1 files changed, 30 insertions, 0 deletions

diff --git a/test/is_same_dense.cpp b/test/is_same_dense.cpp
new file mode 100644
index 000000000..318ba8717
--- /dev/null
+++ b/test/is_same_dense.cpp
@@ -0,0 +1,30 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2015 Gael Guennebaud <gael.guennebaud@inria.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla
+// Public License v. 2.0. If a copy of the MPL was not distributed
+// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include "main.h"
+
+void test_is_same_dense()
+{
+  MatrixXd m1(10,10);
+  Ref<MatrixXd> ref_m1(m1);
+  Ref<const MatrixXd> const_ref_m1(m1);
+  VERIFY(is_same_dense(m1,m1));
+  VERIFY(is_same_dense(m1,ref_m1));
+  VERIFY(is_same_dense(const_ref_m1,m1));
+  VERIFY(is_same_dense(const_ref_m1,ref_m1));
+  
+  VERIFY(is_same_dense(m1.block(0,0,m1.rows(),m1.cols()),m1));
+  VERIFY(!is_same_dense(m1.row(0),m1.col(0)));
+  
+  Ref<const MatrixXd> const_ref_m1_row(m1.row(1));
+  VERIFY(!is_same_dense(m1.row(1),const_ref_m1_row));
+  
+  Ref<const MatrixXd> const_ref_m1_col(m1.col(1));
+  VERIFY(is_same_dense(m1.col(1),const_ref_m1_col));
+}