core: handle RowMajor case for Eigen::Ref

Author: jcarpent

include/eigenpy/numpy-allocator.hpp

@@ -70,8 +70,11 @@ struct NumpyAllocator<Eigen::Ref<MatType, Options, Stride> > {
 
     if (NumpyType::sharedMemory()) {
       const int Scalar_type_code = Register::getTypeCode<Scalar>();
-      Eigen::DenseIndex inner_stride = mat.innerStride(),
-                        outer_stride = mat.outerStride();
+
+      Eigen::DenseIndex inner_stride = MatType::IsRowMajor ? mat.outerStride()
+                                                           : mat.innerStride(),
+                        outer_stride = MatType::IsRowMajor ? mat.innerStride()
+                                                           : mat.outerStride();
 
       const int elsize = call_PyArray_DescrFromType(Scalar_type_code)->elsize;
       npy_intp strides[2] = {elsize * inner_stride, elsize * outer_stride};
@@ -131,8 +134,11 @@ struct NumpyAllocator<const Eigen::Ref<const MatType, Options, Stride> > {
 
     if (NumpyType::sharedMemory()) {
       const int Scalar_type_code = Register::getTypeCode<Scalar>();
-      Eigen::DenseIndex inner_stride = mat.innerStride(),
-                        outer_stride = mat.outerStride();
+
+      Eigen::DenseIndex inner_stride = MatType::IsRowMajor ? mat.outerStride()
+                                                           : mat.innerStride(),
+                        outer_stride = MatType::IsRowMajor ? mat.innerStride()
+                                                           : mat.outerStride();
 
       const int elsize = call_PyArray_DescrFromType(Scalar_type_code)->elsize;
       npy_intp strides[2] = {elsize * inner_stride, elsize * outer_stride};