[linalg.tags.order]

The storage order tags describe the order of elements in an mdspan with layout_blas_packed ([linalg.layout.packed]) layout.

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struct column_major_t {
  explicit column_major_t() = default;
};
inline constexpr column_major_t column_major{};

struct row_major_t {
  explicit row_major_t() = default;
};
inline constexpr row_major_t row_major{};

column_major_t indicates a column-major order, and row_major_t indicates a row-major order.