[mdspan.layout.leftpad.expo] (original) (raw)

23 Containers library [containers]

23.7 Views [views]

23.7.3 Multidimensional access [views.multidim]

23.7.3.4 Layout mapping [mdspan.layout]

23.7.3.4.8 Class template layout_left_padded​::​mapping [mdspan.layout.leftpad]

23.7.3.4.8.2 Exposition-only members [mdspan.layout.leftpad.expo]

static constexpr size_t _static-padding-stride_ = _see below_;

The value is

• 0, if rank_ equals zero or one;
• otherwise, dynamic_extent, if padding_value or first-static-extent equalsdynamic_extent;
• otherwise, the size_t value which is_LEAST-MULTIPLE-AT-LEAST_(padding_value, first-static-extent).

index_type _stride-1_ = _static-padding-stride_;

Recommended practice: Implementations should not store this value if static-padding-stride is not dynamic_extent.

[Note 1:

Using extents<index_type, _static-padding-stride_> instead ofindex_type as the type of stride-1 would achieve this.

— _end note_]