From 2195822df64c34eacc411043a197ce701ae6b135 Mon Sep 17 00:00:00 2001
From: Godeffroy Valet <godeffroy.valet@m4x.org>
Date: Sat, 25 Jul 2015 11:58:36 +0200
Subject: Allowed tensor contraction operation with an empty array of dimension
 pairs, which performs a tensor product.

---
 unsupported/test/cxx11_tensor_contraction.cpp | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

(limited to 'unsupported/test/cxx11_tensor_contraction.cpp')

diff --git a/unsupported/test/cxx11_tensor_contraction.cpp b/unsupported/test/cxx11_tensor_contraction.cpp
index f4acdc504..b0d52c6cf 100644
--- a/unsupported/test/cxx11_tensor_contraction.cpp
+++ b/unsupported/test/cxx11_tensor_contraction.cpp
@@ -448,6 +448,31 @@ static void test_small_blocking_factors()
   }
 }
 
+template<int DataLayout>
+static void test_tensor_product()
+{
+  Tensor<float, 2, DataLayout> mat1(2, 3);
+  Tensor<float, 2, DataLayout> mat2(4, 1);
+  mat1.setRandom();
+  mat2.setRandom();
+
+  Tensor<float, 4, DataLayout> result = mat1.contract(mat2, Eigen::array<DimPair, 0>{{}});
+
+  VERIFY_IS_EQUAL(result.dimension(0), 2);
+  VERIFY_IS_EQUAL(result.dimension(1), 3);
+  VERIFY_IS_EQUAL(result.dimension(2), 4);
+  VERIFY_IS_EQUAL(result.dimension(3), 1);
+  for (int i = 0; i < result.dimension(0); ++i) {
+    for (int j = 0; j < result.dimension(1); ++j) {
+      for (int k = 0; k < result.dimension(2); ++k) {
+        for (int l = 0; l < result.dimension(3); ++l) {
+			VERIFY_IS_APPROX(result(i, j, k, l), mat1(i, j) * mat2(k, l) );
+        }
+      }
+    }
+  }
+}
+
 
 void test_cxx11_tensor_contraction()
 {
@@ -477,4 +502,6 @@ void test_cxx11_tensor_contraction()
   CALL_SUBTEST(test_tensor_vector<RowMajor>());
   CALL_SUBTEST(test_small_blocking_factors<ColMajor>());
   CALL_SUBTEST(test_small_blocking_factors<RowMajor>());
+  CALL_SUBTEST(test_tensor_product<ColMajor>());
+  CALL_SUBTEST(test_tensor_product<RowMajor>());
 }
-- 
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