checkfields

template <class FieldType,
          class = std::enable_if_t<
              arma::is_Col<typename FieldType::object_type>::value ||
              arma::is_Mat_only<typename FieldType::object_type>::value>>
// Check the values of two field types
inline void CheckFields(const FieldType& a,
                          const FieldType& b)
{
  BOOST_REQUIRE_EQUAL(a.n_rows, b.n_rows);
  BOOST_REQUIRE_EQUAL(a.n_cols, b.n_cols);

  for (size_t i = 0; i < a.n_elem; ++i)
    for(size_t j = 0; j < a[i].n_elem; ++j)
      BOOST_REQUIRE_EQUAL(a[i][j], b[i][j]);
}