BloombergLP::bslstl::SyncBufBaseUtil::emitInternal

Atomically transfer any characters buffered by the specified syncBuf object to the wrapped stream buffer, so that it appears in the output stream as a contiguous sequence of characters. The wrapped stream buffer is flushed if and only if a call was made to sync since the most recent call to emit or construction. Return true if get_wrapped() != nullptr, and all of the characters in the associated output were successfully transferred, and the flush (if any) succeeded; return false otherwise. The behavior is undefined unless syncBuf is not null.