[syncstream.syncbuf.assign]

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basic_syncbuf& operator=(basic_syncbuf&& rhs);

Effects: Calls emit() then move assigns from rhs.

After the move assignment *this has the observable state it would have had if it had been move constructed from rhs ([syncstream.syncbuf.cons]).

Postconditions:

(2.1)
rhs.get_wrapped() == nullptr is true.
(2.2)
this->get_allocator() == rhs.get_allocator() is true when allocator_traits<Allocator>::propagate_on_container_move_assignment::value is true; otherwise, the allocator is unchanged.

Remarks: This assignment operator disassociates rhs from its wrapped stream buffer, ensuring destruction of rhs produces no output.

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void swap(basic_syncbuf& other);

Preconditions: Either allocator_traits<Allocator>::propagate_on_container_swap::value is true or this->get_allocator() == other.get_allocator() is true.

Effects: Exchanges the state of *this and other.

31 Input/output library [input.output]

31.11 Synchronized output streams [syncstream]

31.11.2 Class template basic_syncbuf [syncstream.syncbuf]

31.11.2.3 Assignment and swap [syncstream.syncbuf.assign]