tmp/tmpbl5t13uy/{from.md → to.md}
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| 1 |
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###### `layout_left` specialization of `submdspan_mapping` <a id="mdspan.sub.map.left">[[mdspan.sub.map.left]]</a>
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``` cpp
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template<class Extents>
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template<class... SliceSpecifiers>
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constexpr auto layout_left::mapping<Extents>::submdspan-mapping-impl(
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SliceSpecifiers... slices) const -> see below;
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```
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*Returns:*
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- `submdspan_mapping_result{*this, 0}`, if `Extents::rank() == 0` is
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`true`;
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- otherwise,
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`submdspan_mapping_result{layout_left::mapping(sub_ext), offset}`, if
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`SubExtents::rank() == 0` is `true`;
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- otherwise,
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`submdspan_mapping_result{layout_left::mapping(sub_ext), offset}`, if
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- for each k in the range \[`0`, `SubExtents::rank() - 1)`),
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`is_convertible_v<`Sₖ`, full_extent_t>` is `true`; and
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- for k equal to `SubExtents::rank() - 1`, Sₖ is a unit-stride slice
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for `mapping`;
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\[*Note 2*: If the above conditions are true, all Sₖ with k larger
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than `SubExtents::rank() - 1` are convertible to
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`index_type`. — *end note*]
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- otherwise,
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``` cpp
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submdspan_mapping_result{layout_left_padded<S_static>::mapping(sub_ext, stride(u + 1)),
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offset}
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```
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if for a value u for which u+1 is the smallest value p larger than
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zero for which Sₚ is a unit-stride slice for `mapping`, the following
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conditions are met:
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- S₀ is a unit-stride slice for `mapping`; and
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- for each k in the range \[u` + 1`, u` + SubExtents::rank() - 1`),
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`is_convertible_v<`Sₖ`, full_extent_t>` is `true`; and
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- for k equal to u` + SubExtents::rank() - 1`, Sₖ is a unit-stride
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slice for `mapping`;
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and where `S_static` is:
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- `dynamic_extent`, if `static_extent(`k`)` is `dynamic_extent` for
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any k in the range \[`0`, u` + 1`),
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- otherwise, the product of all values `static_extent(`k`)` for k in
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the range \[`0`, u` + 1`);
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- otherwise,
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``` cpp
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submdspan_mapping_result{layout_stride::mapping(sub_ext, sub_strides), offset}
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```
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