[syncstream.syncbuf.members]

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bool emit();

Effects: Atomically transfers the associated output of *this to the stream buffer *wrapped, so that it appears in the output stream as a contiguous sequence of characters.

wrapped->pubsync() is called if and only if a call was made to sync() since the most recent call to emit(), if any.

Synchronization: All emit() calls transferring characters to the same stream buffer object appear to execute in a total order consistent with the “happens before” relation ([intro.races]), where each emit() call synchronizes with subsequent emit() calls in that total order.

Returns: true if all of the following conditions hold; otherwise false:

(4.1)
wrapped == nullptr is false.
(4.2)
All of the characters in the associated output were successfully transferred.
(4.3)
The call to wrapped->pubsync() (if any) succeeded.

Remarks: May call member functions of wrapped while holding a lock uniquely associated with wrapped.

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streambuf_type* get_wrapped() const noexcept;

Returns: wrapped.

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allocator_type get_allocator() const noexcept;

Returns: A copy of the allocator that was set in the constructor or assignment operator.

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void set_emit_on_sync(bool b) noexcept;

Effects: emit-on-sync = b.

31 Input/output library [input.output]

31.11 Synchronized output streams [syncstream]

31.11.2 Class template basic_syncbuf [syncstream.syncbuf]

31.11.2.4 Member functions [syncstream.syncbuf.members]