From fb1ee04087f6d5cfe9009941c1a1eb25b3133a04 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Fri, 9 Jun 2017 13:13:03 +0200
Subject: bug #1410: fix lvalue propagation of Array/Matrix-Wrapper with a
 const nested expression.

---
 test/array_for_matrix.cpp | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'test/array_for_matrix.cpp')

diff --git a/test/array_for_matrix.cpp b/test/array_for_matrix.cpp
index c1501947b..b8721391f 100644
--- a/test/array_for_matrix.cpp
+++ b/test/array_for_matrix.cpp
@@ -235,12 +235,31 @@ template<typename MatrixTraits> void resize(const MatrixTraits& t)
   VERIFY(a1.size()==cols);
 }
 
+template<int>
 void regression_bug_654()
 {
   ArrayXf a = RowVectorXf(3);
   VectorXf v = Array<float,1,Dynamic>(3);
 }
 
+// Check propagation of LvalueBit through Array/Matrix-Wrapper
+template<int>
+void regrrssion_bug_1410()
+{
+  const Matrix4i M;
+  const Array4i A;
+  ArrayWrapper<const Matrix4i> MA = M.array();
+  MA.row(0);
+  MatrixWrapper<const Array4i> AM = A.matrix();
+  AM.row(0);
+
+  VERIFY((internal::traits<ArrayWrapper<const Matrix4i> >::Flags&LvalueBit)==0);
+  VERIFY((internal::traits<MatrixWrapper<const Array4i> >::Flags&LvalueBit)==0);
+
+  VERIFY((internal::traits<ArrayWrapper<Matrix4i> >::Flags&LvalueBit)==LvalueBit);
+  VERIFY((internal::traits<MatrixWrapper<Array4i> >::Flags&LvalueBit)==LvalueBit);
+}
+
 void test_array_for_matrix()
 {
   for(int i = 0; i < g_repeat; i++) {
@@ -280,5 +299,6 @@ void test_array_for_matrix()
     CALL_SUBTEST_5( resize(MatrixXf(internal::random<int>(1,EIGEN_TEST_MAX_SIZE), internal::random<int>(1,EIGEN_TEST_MAX_SIZE))) );
     CALL_SUBTEST_6( resize(MatrixXi(internal::random<int>(1,EIGEN_TEST_MAX_SIZE), internal::random<int>(1,EIGEN_TEST_MAX_SIZE))) );
   }
-  CALL_SUBTEST_6( regression_bug_654() );
+  CALL_SUBTEST_6( regression_bug_654<0>() );
+  CALL_SUBTEST_6( regrrssion_bug_1410<0>() );
 }
-- 
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