From 70fc3f66aa3ec5c15243dc46d5e0286ad9dfb3c9 Mon Sep 17 00:00:00 2001
From: "Jonathan M. Waldrop" <relik107@gmail.com>
Date: Fri, 15 Nov 2024 14:00:28 -0600
Subject: [PATCH] row major eigen backend

---
 include/tensorwrapper/backends/eigen.hpp            | 2 +-
 tests/cxx/unit_tests/tensorwrapper/buffer/eigen.cpp | 5 +++--
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/tensorwrapper/backends/eigen.hpp b/include/tensorwrapper/backends/eigen.hpp
index c61da781..e3d95395 100644
--- a/include/tensorwrapper/backends/eigen.hpp
+++ b/include/tensorwrapper/backends/eigen.hpp
@@ -25,7 +25,7 @@ namespace tensorwrapper::eigen {
 #ifdef TENSORWRAPPER_HAS_EIGEN
 
 template<typename FloatType, unsigned short Rank>
-using data_type = Eigen::Tensor<FloatType, int(Rank)>;
+using data_type = Eigen::Tensor<FloatType, int(Rank), Eigen::RowMajor>;
 
 #else
 
diff --git a/tests/cxx/unit_tests/tensorwrapper/buffer/eigen.cpp b/tests/cxx/unit_tests/tensorwrapper/buffer/eigen.cpp
index cd884ffa..73572c8e 100644
--- a/tests/cxx/unit_tests/tensorwrapper/buffer/eigen.cpp
+++ b/tests/cxx/unit_tests/tensorwrapper/buffer/eigen.cpp
@@ -26,8 +26,9 @@ namespace {
 
 template<typename FloatType, typename LHSType, typename RHSType>
 bool compare_eigen(const LHSType& lhs, const RHSType& rhs) {
-    auto d                        = lhs - rhs;
-    Eigen::Tensor<FloatType, 0> r = d.sum();
+    using r_type = Eigen::Tensor<FloatType, 0, Eigen::RowMajor>;
+    auto d       = lhs - rhs;
+    r_type r     = d.sum();
 
     return (r() == 0.0);
 }