cppdraft_translate/cppdraft/syncstream/syncbuf/assign.md

[syncstream.syncbuf.assign]

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]

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basic_syncbuf& operator=(basic_syncbuf&& rhs);

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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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Postconditions:

• (2.1)

rhs.get_wrapped() == nullptr is true.

• (2.2)

this->get_allocator() == rhs.get_allocator() is true whenallocator_traits::propagate_on_container_move_assignment::value is true; otherwise, the allocator is unchanged.

3

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Returns: *this.

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);

5

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Preconditions: Eitherallocator_traits​::​propagate_on_container_swap​::​value is true orthis->get_allocator() == other.get_allocator() is true.

6

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Effects: Exchanges the state of *this and other.