From 0fe6b7d687430fd1fe2d390da2f09fcb8ddc8093 Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Thu, 17 Jan 2019 18:27:25 +0100
Subject: Make nestByValue works again (broken since 3.3) and add unit tests.

---
 test/nestbyvalue.cpp | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 test/nestbyvalue.cpp

(limited to 'test/nestbyvalue.cpp')

diff --git a/test/nestbyvalue.cpp b/test/nestbyvalue.cpp
new file mode 100644
index 000000000..c5356bc24
--- /dev/null
+++ b/test/nestbyvalue.cpp
@@ -0,0 +1,37 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2019 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/.
+
+#define TEST_ENABLE_TEMPORARY_TRACKING
+
+#include "main.h"
+
+typedef NestByValue<MatrixXd> CpyMatrixXd;
+typedef CwiseBinaryOp<internal::scalar_sum_op<double,double>,const CpyMatrixXd,const CpyMatrixXd> XprType;
+
+XprType get_xpr_with_temps(const MatrixXd& a)
+{
+  MatrixXd t1 = a.rowwise().reverse();
+  MatrixXd t2 = a+a;
+  return t1.nestByValue() + t2.nestByValue();
+}
+
+EIGEN_DECLARE_TEST(nestbyvalue)
+{
+  for(int i = 0; i < g_repeat; i++) {
+    Index rows = internal::random<Index>(1,EIGEN_TEST_MAX_SIZE);
+    Index cols = internal::random<Index>(1,EIGEN_TEST_MAX_SIZE);
+    MatrixXd a = MatrixXd(rows,cols);
+    nb_temporaries = 0;
+    XprType x = get_xpr_with_temps(a);
+    VERIFY_IS_EQUAL(nb_temporaries,6);
+    MatrixXd b = x;
+    VERIFY_IS_EQUAL(nb_temporaries,6+1);
+    VERIFY_IS_APPROX(b, a.rowwise().reverse().eval() + (a+a).eval());
+  }
+}
-- 
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