tmp/tmpzy4vcg90/{from.md → to.md}
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| 1 |
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###### Constructors <a id="mdspan.layout.left.cons">[[mdspan.layout.left.cons]]</a>
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``` cpp
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constexpr mapping(const extents_type& e) noexcept;
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```
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*Preconditions:* The size of the multidimensional index space `e` is
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representable as a value of type `index_type` [[basic.fundamental]].
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*Effects:* Direct-non-list-initializes *extents\_* with `e`.
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``` cpp
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template<class OtherExtents>
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constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
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mapping(const mapping<OtherExtents>& other) noexcept;
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```
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*Constraints:* `is_constructible_v<extents_type, OtherExtents>` is
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`true`.
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*Preconditions:* `other.required_span_size()` is representable as a
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value of type `index_type` [[basic.fundamental]].
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*Effects:* Direct-non-list-initializes *extents\_* with
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`other.extents()`.
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``` cpp
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template<class OtherExents>
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constexpr explicit(!is_convertible_v<OtherExtents, extents_type>)
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mapping(const layout_right::mapping<OtherExtents>& other) noexcept;
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```
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*Constraints:*
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- `extents_type::rank() <= 1` is `true`, and
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- `is_constructible_v<extents_type, OtherExtents>` is `true`.
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*Preconditions:* `other.required_span_size()` is representable as a
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value of type `index_type` [[basic.fundamental]].
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*Effects:* Direct-non-list-initializes *extents\_* with
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`other.extents()`.
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``` cpp
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template<class OtherExtents>
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constexpr explicit(extents_type::rank() > 0)
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mapping(const layout_stride::mapping<OtherExtents>& other);
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```
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*Constraints:* `is_constructible_v<extents_type, OtherExtents>` is
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`true`.
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*Preconditions:*
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- If `extents_type::rank() > 0` is `true`, then for all r in the range
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[0, `extents_type::rank()`), `other.stride(`r`)` equals
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`other.extents().`*`fwd-prod-of-extents`*`(`r`)`, and
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- `other.required_span_size()` is representable as a value of type
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`index_type` [[basic.fundamental]].
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*Effects:* Direct-non-list-initializes *extents\_* with
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`other.extents()`.
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