std::stop_source::stop_source

stop_source();	(1)	(since C++20)
explicit stop_source( std::nostopstate_t nss ) noexcept;	(2)	(since C++20)
stop_source( const stop_source& other ) noexcept;	(3)	(since C++20)
stop_source( stop_source&& other ) noexcept;	(4)	(since C++20)

Constructs a new stop_source object.

1) Constructs a stop_source with new stop-state.

2) Constructs an empty stop_source with no associated stop-state.

3) Copy constructor. Constructs a stop_source whose associated stop-state is the same as that of other.

4) Move constructor. Constructs a stop_source whose associated stop-state is the same as that of other; other is left empty.

nss	-	an `std::nostopstate_t` placeholder object to construct an empty `stop_source`
other	-	another `stop_source` object to construct this `stop_source` object with

1) stop_possible() is true and stop_requested() is false

2) stop_possible() and stop_requested() are both false

3) *this and other share the same associated stop-state and compare equal

4) *this has other's previously associated stop-state, and other.stop_possible() is false

1) std::bad_alloc if memory could not be allocated for the stop-state

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