std::basic_ostream::flush – cppreference.com

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Writes uncommitted changes to the underlying output sequence.

If rdbuf() is a null pointer, does nothing

Otherwise, constructs a sentry object which checks the stream for errors and flushes the tie()'d output streams. If the sentry object returns false, does nothing (seit C++11)

Otherwise, calls rdbuf()->pubsync(). If the call returns -1, calls setstate(badbit).

Parameter

(None)

Original:

(none)

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Rückgabewert

*this

Ausnahmen

May throw std::ios_base::failure if exceptions()&badbit!=0.

Beispiel

#include <thread>
#include <iostream>
#include <chrono>
void f()
{
    std::cout << "Output from thread...";
    std::this_thread::sleep_for(std::chrono::seconds(2));
    std::cout << "...thread calls flush()\n";
    std::cout.flush();
}

int main()
{
    std::thread t1(f);
    std::this_thread::sleep_for(std::chrono::seconds(1));
    std::clog << "Output from main\n";
    t1.join();
}

Output:

Output from main
Output from thread.....thread calls flush()

Siehe auch


sync	synchronisiert mit dem zugrunde liegenden Speicher Original: synchronizes with the underlying storage device The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::basic_istream`) [edit]

flush	spült die Ausgabe-Stream Original: flushes the output stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)

endl	Ausgänge `'\n'` und spült den Ausgabe-Stream Original: outputs `'\n'` and flushes the output stream The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktions-Template)