From 93d8d0e1b528aa0f89075b38132da14b2d814cd6 Mon Sep 17 00:00:00 2001
From: Benoit Jacob <jacob.benoit.1@gmail.com>
Date: Wed, 9 Jun 2010 20:50:18 -0400
Subject: [PATCH] add unit test for bug #132

---
 test/CMakeLists.txt |  1 +
 test/bug_132.cpp    | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100644 test/bug_132.cpp

diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 93588ee8e..bac3f4877 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -236,6 +236,7 @@ if(NOT EIGEN_DEFAULT_TO_ROW_MAJOR)
 endif()
 ei_add_test(swap)
 ei_add_test(visitor)
+ei_add_test(bug_132)
 
 ei_add_test(prec_inverse_4x4 ${EI_OFLAG})
 
diff --git a/test/bug_132.cpp b/test/bug_132.cpp
new file mode 100644
index 000000000..aa9bf2c28
--- /dev/null
+++ b/test/bug_132.cpp
@@ -0,0 +1,41 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra. Eigen itself is part of the KDE project.
+//
+// Copyright (C) 2010 Benoit Jacob <jacob.benoit.1@gmail.com>
+//
+// Eigen is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 3 of the License, or (at your option) any later version.
+//
+// Alternatively, you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of
+// the License, or (at your option) any later version.
+//
+// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License and a copy of the GNU General Public License along with
+// Eigen. If not, see <http://www.gnu.org/licenses/>.
+
+#include "main.h"
+
+void test_bug_132() {
+  enum { size = 100 };
+  MatrixXd A(size, size);
+  VectorXd b(size), c(size);
+  {
+    VectorXd y = A.transpose() * (b-c);  // bug 132: infinite recursion in coeffRef
+    VectorXd z = (b-c).transpose() * A;  // bug 132: infinite recursion in coeffRef
+  }
+
+  // the following ones weren't failing, but let's include them for completeness:
+  {
+    VectorXd y = A * (b-c);
+    VectorXd z = (b-c).transpose() * A.transpose();
+  }
+}