basic_ostream& flush(); |
Writes uncommitted changes to the underlying output sequence.
If rdbuf() is a null pointer, does nothing.
Otherwise, behaves as an UnformattedOutputFunction (since C++11). After constructing and checking the sentry object, calls rdbuf()->pubsync(). If the call returns -1, calls setstate(badbit).
Parameters
(none).
Return value
*this.
Exceptions
May throw std::ios_base::failure if exceptions()&badbit!=0.
Example
#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()
See also
| synchronizes with the underlying storage device (public member function of std::basic_istream) | |
| flushes the output stream (function template) | |
outputs '\n' and flushes the output stream (function template) |
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