tmp/tmp3et2pvfz/{from.md → to.md}
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| 1 |
+
##### Constructors <a id="mdspan.extents.cons">[[mdspan.extents.cons]]</a>
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| 2 |
+
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| 3 |
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``` cpp
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+
template<class OtherIndexType, size_t... OtherExtents>
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| 5 |
+
constexpr explicit(see below)
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+
extents(const extents<OtherIndexType, OtherExtents...>& other) noexcept;
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| 7 |
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```
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+
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+
*Constraints:*
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- `sizeof...(OtherExtents) == rank()` is `true`.
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- `((OtherExtents == dynamic_extent || Extents == dynamic_extent || OtherExtents == Extents) && ...)`
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is `true`.
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*Preconditions:*
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- `other.extent(`r`)` equals Eᵣ for each r for which Eᵣ is a static
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extent, and
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- either
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- `sizeof...(OtherExtents)` is zero, or
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- `other.extent(`r`)` is representable as a value of type `index_type`
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for every rank index r of `other`.
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+
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*Ensures:* `*this == other` is `true`.
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+
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*Remarks:* The expression inside `explicit` is equivalent to:
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+
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``` cpp
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(((Extents != dynamic_extent) && (OtherExtents == dynamic_extent)) || ... ) ||
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| 30 |
+
(numeric_limits<index_type>::max() < numeric_limits<OtherIndexType>::max())
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| 31 |
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```
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+
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``` cpp
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template<class... OtherIndexTypes>
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constexpr explicit extents(OtherIndexTypes... exts) noexcept;
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```
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Let `N` be `sizeof...(OtherIndexTypes)`, and let `exts_arr` be
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`array<index_type, N>{static_cast<`
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`index_type>(std::move(exts))...}`.
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| 41 |
+
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*Constraints:*
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| 43 |
+
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- `(is_convertible_v<OtherIndexTypes, index_type> && ...)` is `true`,
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| 45 |
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- `(is_nothrow_constructible_v<index_type, OtherIndexTypes> && ...)` is
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| 46 |
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`true`, and
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- `N == rank_dynamic() || N == rank()` is `true`. \[*Note 1*: One can
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| 48 |
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construct `extents` from just dynamic extents, which are all the
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values getting stored, or from all the extents with a
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precondition. — *end note*]
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*Preconditions:*
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| 53 |
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| 54 |
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- If `N != rank_dynamic()` is `true`, `exts_arr[`r`]` equals Eᵣ for each
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| 55 |
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r for which Eᵣ is a static extent, and
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| 56 |
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- either
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- `sizeof...(exts) == 0` is `true`, or
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| 58 |
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- each element of `exts` is nonnegative and is representable as a
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value of type `index_type`.
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+
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*Ensures:* `*this == extents(exts_arr)` is `true`.
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| 62 |
+
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+
``` cpp
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| 64 |
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template<class OtherIndexType, size_t N>
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constexpr explicit(N != rank_dynamic())
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extents(span<OtherIndexType, N> exts) noexcept;
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| 67 |
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template<class OtherIndexType, size_t N>
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constexpr explicit(N != rank_dynamic())
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extents(const array<OtherIndexType, N>& exts) noexcept;
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```
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| 71 |
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*Constraints:*
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| 73 |
+
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- `is_convertible_v<const OtherIndexType&, index_type>` is `true`,
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| 75 |
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- `is_nothrow_constructible_v<index_type, const OtherIndexType&>` is
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| 76 |
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`true`, and
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| 77 |
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- `N == rank_dynamic() || N == rank()` is `true`.
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| 78 |
+
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| 79 |
+
*Preconditions:*
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| 80 |
+
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| 81 |
+
- If `N != rank_dynamic()` is `true`, `exts[`r`]` equals Eᵣ for each r
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| 82 |
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for which Eᵣ is a static extent, and
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| 83 |
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- either
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| 84 |
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- `N` is zero, or
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| 85 |
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- `exts[`r`]` is nonnegative and is representable as a value of type
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| 86 |
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`index_type` for every rank index r.
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| 87 |
+
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| 88 |
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*Effects:*
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| 89 |
+
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| 90 |
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- If `N` equals `dynamic_rank()`, for all d in the range
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| 91 |
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[0, `rank_dynamic()`), direct-non-list-initializes
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| 92 |
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*`dynamic-extents`*`[`d`]` with `as_const(exts[`d`])`.
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| 93 |
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- Otherwise, for all d in the range [0, `rank_dynamic()`),
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direct-non-list-initializes *`dynamic-extents`*`[`d`]` with
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| 95 |
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`as_const(exts[`*`dynamic-index-inv`*`(`d`)])`.
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| 96 |
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| 97 |
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``` cpp
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| 98 |
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template<class... Integrals>
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explicit extents(Integrals...) -> see below;
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| 100 |
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```
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*Constraints:* `(is_convertible_v<Integrals, size_t> && ...)` is `true`.
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| 103 |
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| 104 |
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*Remarks:* The deduced type is `dextents<size_t, sizeof...(Integrals)>`.
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| 105 |
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