tmp/tmpwvdsfa6o/{from.md → to.md}
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| 1 |
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###### Observers <a id="mdspan.layout.left.obs">[[mdspan.layout.left.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:* `extents().`*`fwd-prod-of-extents`*`(extents_type::rank())`.
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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) == extents_type::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 index_type stride(rank_type i) const;
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```
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*Constraints:* `extents_type::rank() > 0` is `true`.
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*Preconditions:* `i < extents_type::rank()` is `true`.
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*Returns:* `extents().`*`fwd-prod-of-extents`*`(i)`.
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``` cpp
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template<class OtherExtents>
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friend constexpr bool operator==(const mapping& x, const mapping<OtherExtents>& y) noexcept;
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```
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*Constraints:* `extents_type::rank() == OtherExtents::rank()` is `true`.
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*Effects:* Equivalent to: `return x.extents() == y.extents();`
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