23 Containers library [containers]

23.7 Views [views]

23.7.3 Multidimensional access [views.multidim]

23.7.3.4 Layout mapping [mdspan.layout]

23.7.3.4.4 Layout mapping policies [mdspan.layout.policy.overview]

namespace std { struct layout_left { template<class Extents> class mapping; }; struct layout_right { template<class Extents> class mapping; }; struct layout_stride { template<class Extents> class mapping; }; template<size_t PaddingValue> struct layout_left_padded { template<class Extents> class mapping; }; template<size_t PaddingValue> struct layout_right_padded { template<class Extents> class mapping; }; }

Each of layout_left, layout_right, and layout_stride, as well as each specialization of layout_left_padded and layout_right_padded, meets the layout mapping policy requirements and is a trivially copyable type.

Furthermore, is_trivially_default_constructible_v<T> is true for any such type T.