tmp/tmpnzfdmjo_/{from.md → to.md}
RENAMED
|
@@ -0,0 +1,38 @@
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| 1 |
+
#### Swap <a id="expected.void.swap">[[expected.void.swap]]</a>
|
| 2 |
+
|
| 3 |
+
``` cpp
|
| 4 |
+
constexpr void swap(expected& rhs) noexcept(see below);
|
| 5 |
+
```
|
| 6 |
+
|
| 7 |
+
*Constraints:* `is_swappable_v<E>` is `true` and
|
| 8 |
+
`is_move_constructible_v<E>` is `true`.
|
| 9 |
+
|
| 10 |
+
*Effects:* See [[expected.void.swap]].
|
| 11 |
+
|
| 12 |
+
**Table: `swap(expected&)` effects** <a id="expected.void.swap">[expected.void.swap]</a>
|
| 13 |
+
|
| 14 |
+
| \topline | `this->has_value()` | `!this->has_value()` |
|
| 15 |
+
| -------- | ------------------- | -------------------- |
|
| 16 |
+
|
| 17 |
+
|
| 18 |
+
For the case where `rhs.value()` is `false` and `this->has_value()` is
|
| 19 |
+
`true`, equivalent to:
|
| 20 |
+
|
| 21 |
+
``` cpp
|
| 22 |
+
construct_at(addressof(unex), std::move(rhs.unex));
|
| 23 |
+
destroy_at(addressof(rhs.unex));
|
| 24 |
+
has_val = false;
|
| 25 |
+
rhs.has_val = true;
|
| 26 |
+
```
|
| 27 |
+
|
| 28 |
+
*Throws:* Any exception thrown by the expressions in the *Effects*.
|
| 29 |
+
|
| 30 |
+
*Remarks:* The exception specification is equivalent to
|
| 31 |
+
`is_nothrow_move_constructible_v<E> && is_nothrow_swappable_v<E>`.
|
| 32 |
+
|
| 33 |
+
``` cpp
|
| 34 |
+
friend constexpr void swap(expected& x, expected& y) noexcept(noexcept(x.swap(y)));
|
| 35 |
+
```
|
| 36 |
+
|
| 37 |
+
*Effects:* Equivalent to `x.swap(y)`.
|
| 38 |
+
|