std::basic_ostream<CharT,Traits>::flush
De cppreference.com
basic_ostream& flush();
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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 (desde C++11)
Otherwise, calls rdbuf()->pubsync(). If the call returns -1, calls setstate(badbit).
Parámetros
(Ninguno)
Original:
(none)
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Valor de retorno
*this
Excepciones
May throw std::ios_base::failure if exceptions()&badbit!=0.
Ejemplo
Ejecuta este código
#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();
}
Salida:
Output from main
Output from thread.....thread calls flush()