From 1e9664b14737d016fabbdb72327aeda6a06bf623 Mon Sep 17 00:00:00 2001
From: Christoph Hertzberg <chtz@informatik.uni-bremen.de>
Date: Fri, 20 Dec 2019 18:10:22 +0100
Subject: Bug #1796: Make matrix squareroot usable for Map and Ref types

---
 unsupported/test/matrix_function.cpp | 38 ++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'unsupported/test')

diff --git a/unsupported/test/matrix_function.cpp b/unsupported/test/matrix_function.cpp
index 2049b8ba0..6d753737d 100644
--- a/unsupported/test/matrix_function.cpp
+++ b/unsupported/test/matrix_function.cpp
@@ -177,6 +177,39 @@ void testMatrixType(const MatrixType& m)
   }
 }
 
+template<typename MatrixType>
+void testMapRef(const MatrixType& A)
+{
+  // Test if passing Ref and Map objects is possible
+  // (Regression test for Bug #1796)
+  Index size = A.rows();
+  MatrixType X; X.setRandom(size, size);
+  MatrixType Y(size,size);
+  Ref<      MatrixType> R(Y);
+  Ref<const MatrixType> Rc(X);
+  Map<      MatrixType> M(Y.data(), size, size);
+  Map<const MatrixType> Mc(X.data(), size, size);
+
+  X = X*X; // make sure sqrt is possible
+  Y = X.sqrt();
+  R = Rc.sqrt();
+  M = Mc.sqrt();
+  Y = X.exp();
+  R = Rc.exp();
+  M = Mc.exp();
+  X = Y; // make sure log is possible
+  Y = X.log();
+  R = Rc.log();
+  M = Mc.log();
+
+  Y = X.cos() + Rc.cos() + Mc.cos();
+  Y = X.sin() + Rc.sin() + Mc.sin();
+
+  Y = X.cosh() + Rc.cosh() + Mc.cosh();
+  Y = X.sinh() + Rc.sinh() + Mc.sinh();
+}
+
+
 EIGEN_DECLARE_TEST(matrix_function)
 {
   CALL_SUBTEST_1(testMatrixType(Matrix<float,1,1>()));
@@ -186,4 +219,9 @@ EIGEN_DECLARE_TEST(matrix_function)
   CALL_SUBTEST_5(testMatrixType(Matrix<double,5,5,RowMajor>()));
   CALL_SUBTEST_6(testMatrixType(Matrix4cd()));
   CALL_SUBTEST_7(testMatrixType(MatrixXd(13,13)));
+
+  CALL_SUBTEST_1(testMapRef(Matrix<float,1,1>()));
+  CALL_SUBTEST_2(testMapRef(Matrix3cf()));
+  CALL_SUBTEST_3(testMapRef(MatrixXf(8,8)));
+  CALL_SUBTEST_7(testMapRef(MatrixXd(13,13)));
 }
-- 
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