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    std::ios_base::sync_with_stdio

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    <tbody> </tbody>
    static bool sync_with_stdio( bool sync = true );

    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.

    For a standard stream str, synchronized with the C stream f, the following pairs of functions have identical effect:

    1) std::fputc(f, c) and str.rdbuf()->sputc(c)
    2) std::fgetc(f) and str.rdbuf()->sbumpc(c)
    3) std::ungetc(c, f) and str.rdbuf()->sputbackc(c) In practice, this means that the C++ and the C streams use the same buffer, and therefore, can be mixed freely. In addition, synchronized C++ streams are guaranteed to be thread-safe (individual characters output from multiple threads may interleave, but no data races occur)

    If the synchronization is turned off, the C++ standard streams are allowed to buffer their I/O independently, which may be considerably faster in some cases.

    By default, all eight standard C++ streams are synchronized with their respective C streams.

    It is implementation-defined if this function has any effect if called after some I/O occurred on the standard stream.

    Parametri

    sync - the new synchronization setting

    Valore di ritorno

    synchronization state before the call to the function

    Esempio

    #include <iostream>
#include <cstdio>
int main()
{
    std::cout.sync_with_stdio(false);
    std::cout << "a\n";
    std::printf("b\n");
    std::cout << "c\n";
}

    Output: 

    b
a
c

    Vedi anche
    scrive nel flusso di output standard di stdout
    (oggetto globale) C
    Original:
    writes to the standard C output stream stdout
    (oggetto globale)
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    [modifica]
    scrive nel flusso di errore standard di C stderr, unbuffered
    (oggetto globale)
    Original:
    writes to the standard C error stream stderr, unbuffered
    (oggetto globale)
    The text has been machine-translated via Google Translate.
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    [modifica]
    scrive allo standard stderr
    (oggetto globale) flusso di errore C
    Original:
    writes to the standard C error stream stderr
    (oggetto globale)
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    [modifica]