tmp/tmp84woc112/{from.md → to.md}
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| 1 |
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###### Observers <a id="mdspan.layout.stride.obs">[[mdspan.layout.stride.obs]]</a>
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``` cpp
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constexpr index_type required_span_size() const noexcept;
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```
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*Returns:* *`REQUIRED-SPAN-SIZE`*`(extents(), `*`strides_`*`)`.
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``` cpp
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template<class... Indices>
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constexpr index_type operator()(Indices... i) const noexcept;
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```
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*Constraints:*
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- `sizeof...(Indices) == `*`rank_`* is `true`,
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- `(is_convertible_v<Indices, index_type> && ...)` is `true`, and
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- `(is_nothrow_constructible_v<index_type, Indices> && ...)` is `true`.
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*Preconditions:* `extents_type::`*`index-cast`*`(i)` is a
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multidimensional index in *extents\_*[[mdspan.overview]].
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*Effects:* Let `P` be a parameter pack such that
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``` cpp
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is_same_v<index_sequence_for<Indices...>, index_sequence<P...>>
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```
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is `true`. Equivalent to:
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``` cpp
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return ((static_cast<index_type>(i) * stride(P)) + ... + 0);
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```
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``` cpp
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constexpr bool is_exhaustive() const noexcept;
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```
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*Returns:*
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- `true` if *rank\_* is 0.
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- Otherwise, `true` if there is a permutation P of the integers in the
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range [0, rank_) such that `stride(`p₀`)` equals 1, and `stride(`pᵢ`)`
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equals `stride(`pᵢ₋₁`) * extents().extent(`pᵢ₋₁`)` for i in the range
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[1, rank_), where pᵢ is the iᵗʰ element of P.
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- Otherwise, `false`.
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``` cpp
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template<class OtherMapping>
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friend constexpr bool operator==(const mapping& x, const OtherMapping& y) noexcept;
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```
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*Constraints:*
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- `layout-mapping-alike<OtherMapping>` is satisfied.
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- *`rank_`*` == OtherMapping::extents_type::rank()` is `true`.
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- `OtherMapping::is_always_strided()` is `true`.
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*Preconditions:* `OtherMapping` meets the layout mapping
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requirements [[mdspan.layout.policy.reqmts]].
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*Returns:* `true` if `x.extents() == y.extents()` is `true`,
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*`OFFSET`*`(y) == 0` is `true`, and each of
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`x.stride(`r`) == y.stride(`r`)` is `true` for r in the range
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[0, `x.extents().rank()`). Otherwise, `false`.
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