[stopsource.cons] - C++17 → C++20

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+#### Constructors, copy, and assignment <a id="stopsource.cons">[[stopsource.cons]]</a>
+``` cpp
+stop_source();
+```
+*Effects:* Initialises `*this` to have ownership of a new stop state.
+*Ensures:* `stop_possible()` is `true` and `stop_requested()` is
+`false`.
+*Throws:* `bad_alloc` if memory could not be allocated for the stop
+state.
+``` cpp
+explicit stop_source(nostopstate_t) noexcept;
+```
+*Ensures:* `stop_possible()` is `false` and `stop_requested()` is
+`false`.
+[*Note 1*: No resources are allocated for the state. — *end note*]
+``` cpp
+stop_source(const stop_source& rhs) noexcept;
+```
+*Ensures:* `*this == rhs` is `true`.
+[*Note 2*: `*this` and `rhs` share the ownership of the same stop
+state, if any. — *end note*]
+``` cpp
+stop_source(stop_source&& rhs) noexcept;
+```
+*Ensures:* `*this` contains the value of `rhs` prior to the start of
+construction and `rhs.stop_possible()` is `false`.
+``` cpp
+~stop_source();
+```
+*Effects:* Releases ownership of the stop state, if any.
+``` cpp
+stop_source& operator=(const stop_source& rhs) noexcept;
+```
+*Effects:* Equivalent to: `stop_source(rhs).swap(*this)`.
+*Returns:* `*this`.
+``` cpp
+stop_source& operator=(stop_source&& rhs) noexcept;
+```
+*Effects:* Equivalent to: `stop_source(std::move(rhs)).swap(*this)`.
+*Returns:* `*this`.
+``` cpp
+void swap(stop_source& rhs) noexcept;
+```
+*Effects:* Exchanges the values of `*this` and `rhs`.

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