From Cppreference
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| static bool sync_with_stdio( bool sync = true );
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Sets whether the standard std::cin, std::cout, std::cerr, std::clog, std::wcin, std::wcout, std::wcerr and std::wclog C++ streams are synchronized to the standard stdin, stdout, stderr and stdlog C streams after each input/output operation. If the synchronization is turned off, the C++ standard streams are allowed to act independently. In this case using both C and C++ standard streams at the same time leads to undefined behavior. If the synchronization is turned on, the performance of the C++ standard streams is degraded.
By default, the C++ streams are synchronized with the C streams.
[edit] Parameters
| sync
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the new synchronization setting
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[edit] Return value
synchronization state before the call to the function
[edit] Example