[linalg.conjtransposed]

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  template<class ElementType, class Extents, class Layout, class Accessor>
    constexpr auto conjugate_transposed(mdspan<ElementType, Extents, Layout, Accessor> a);

[Example 1: void test_conjugate_transposed(mdspan<complex<double>, extents<size_t, 3, 4> a) { const auto num_rows = a.extent(0); const auto num_cols = a.extent(1); auto a_ct = conjugate_transposed(a); assert(num_rows == a_ct.extent(1); assert(num_cols == a_ct.extent(0); assert(a.stride(0) == a_ct.stride(1); assert(a.stride(1) == a_ct.stride(0); for (size_t row = 0; row < num_rows; ++row) { for (size_t col = 0; col < num_rows; ++col) { assert(a[row, col] == conj(a_ct[col, row]); } } auto a_ct_ct = conjugate_transposed(a_ct); assert(num_rows == a_ct_ct.extent(0); assert(num_cols == a_ct_ct.extent(1); assert(a.stride(0) == a_ct_ct.stride(0); assert(a.stride(1) == a_ct_ct.stride(1); for (size_t row = 0; row < num_rows; ++row) { for (size_t col = 0; col < num_rows; ++col) { assert(a[row, col] == a_ct_ct[row, col]); assert(conj(a_ct[col, row]) == a_ct_ct[row, col]); } } } — end example]