numpy-allocator: extend row vector fix to const<EigenRef>

include/eigenpy/numpy-allocator.hpp

@@ -135,10 +135,11 @@ struct NumpyAllocator<const Eigen::Ref<const MatType, Options, Stride> > {
     if (NumpyType::sharedMemory()) {
       const int Scalar_type_code = Register::getTypeCode<Scalar>();
 
-      Eigen::DenseIndex inner_stride = MatType::IsRowMajor ? mat.outerStride()
-                                                           : mat.innerStride(),
-                        outer_stride = MatType::IsRowMajor ? mat.innerStride()
-                                                           : mat.outerStride();
+      const bool reverse_strides = MatType::IsRowMajor || (mat.rows() == 1);
+      Eigen::DenseIndex inner_stride = reverse_strides ? mat.outerStride()
+                                                       : mat.innerStride(),
+                        outer_stride = reverse_strides ? mat.innerStride()
+                                                       : mat.outerStride();
 
       const int elsize = call_PyArray_DescrFromType(Scalar_type_code)->elsize;
       npy_intp strides[2] = {elsize * inner_stride, elsize * outer_stride};