From cppreference.com
voidset_emit_on_sync(boolb)noexcept;Changes the current emit-on-sync policy.
The value false (the default) indicates that any flush will be postponed until a call to emit.
The value true makes flushes apply immediately.
Parameters
b - new value for the emit-on-sync policy Example
See also
[virtual]
synchronizes the buffers with the associated character sequence
(virtual protected member function of std::basic_streambuf<CharT,Traits>)
atomically transmits the entire internal buffer to the wrapped streambuf
(public member function)
(C++20)
controls whether a stream's
emits on flush
(function template)