29 Input/output library [input.output]

29.10 Synchronized output streams [syncstream]

29.10.2 Class template basic_­syncbuf [syncstream.syncbuf]

29.10.2.3 Assignment and swap [syncstream.syncbuf.assign]

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basic_syncbuf& operator=(basic_syncbuf&& rhs) noexcept;
1
#
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]).
2
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Returns: *this.
3
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Postconditions:
  • (3.1)
    rhs.get_­wrapped() == nullptr is true.
  • (3.2)
    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.
4
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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) noexcept;
5
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Preconditions: Either allocator_­traits<Allocator>​::​propagate_­on_­container_­swap​::​value is true or this->get_­allocator() == other.get_­allocator() is true.
6
#
Effects: Exchanges the state of *this and other.