tmp/tmp3g7w5ewf/{from.md → to.md}
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| 1 |
+
#### Subviews <a id="span.sub">[[span.sub]]</a>
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``` cpp
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template<size_t Count> constexpr span<element_type, Count> first() const;
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```
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+
*Mandates:* `Count <= Extent` is `true`.
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| 8 |
+
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*Preconditions:* `Count <= size()` is `true`.
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*Effects:* Equivalent to: `return R{data(), Count};` where `R` is the
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return type.
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``` cpp
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template<size_t Count> constexpr span<element_type, Count> last() const;
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```
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*Mandates:* `Count <= Extent` is `true`.
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*Preconditions:* `Count <= size()` is `true`.
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*Effects:* Equivalent to: `return R{data() + (size() - Count), Count};`
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where `R` is the return type.
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``` cpp
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template<size_t Offset, size_t Count = dynamic_extent>
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constexpr span<element_type, see below> subspan() const;
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```
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+
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| 30 |
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*Mandates:*
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+
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``` cpp
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Offset <= Extent && (Count == dynamic_extent || Count <= Extent - Offset)
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| 34 |
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```
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is `true`.
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| 37 |
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| 38 |
+
*Preconditions:*
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| 39 |
+
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| 40 |
+
``` cpp
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| 41 |
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Offset <= size() && (Count == dynamic_extent || Count <= size() - Offset)
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| 42 |
+
```
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| 43 |
+
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| 44 |
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is `true`.
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| 45 |
+
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| 46 |
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*Effects:* Equivalent to:
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| 47 |
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``` cpp
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return span<ElementType, see below>(
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| 50 |
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data() + Offset, Count != dynamic_extent ? Count : size() - Offset);
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| 51 |
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```
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*Remarks:* The second template argument of the returned `span` type is:
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``` cpp
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Count != dynamic_extent ? Count
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: (Extent != dynamic_extent ? Extent - Offset
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: dynamic_extent)
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```
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``` cpp
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constexpr span<element_type, dynamic_extent> first(size_type count) const;
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| 63 |
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```
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| 64 |
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| 65 |
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*Preconditions:* `count <= size()` is `true`.
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| 66 |
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*Effects:* Equivalent to: `return {data(), count};`
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| 68 |
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| 69 |
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``` cpp
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constexpr span<element_type, dynamic_extent> last(size_type count) const;
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| 71 |
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```
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| 72 |
+
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| 73 |
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*Preconditions:* `count <= size()` is `true`.
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| 74 |
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*Effects:* Equivalent to: `return {data() + (size() - count), count};`
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| 77 |
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``` cpp
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constexpr span<element_type, dynamic_extent> subspan(
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size_type offset, size_type count = dynamic_extent) const;
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| 80 |
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```
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| 81 |
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| 82 |
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*Preconditions:*
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| 84 |
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``` cpp
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offset <= size() && (count == dynamic_extent || count <= size() - offset)
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```
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| 87 |
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is `true`.
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| 89 |
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| 90 |
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*Effects:* Equivalent to:
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| 91 |
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| 92 |
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``` cpp
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| 93 |
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return {data() + offset, count == dynamic_extent ? size() - offset : count};
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| 94 |
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```
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| 95 |
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