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std::basic_ostream::flush

提供: cppreference.com
< cpp‎ | io‎ | basic ostream

 
 
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std::basic_ostream
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operator<<(std::basic_ostream)
 
basic_ostream& flush();

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 (C + + 11以来)

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

目次

[編集] パラメータ

(なし)
Original:
(none)
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[編集] 値を返します

*this

[編集] 例外

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

[編集]

#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()

[編集] も参照してください

基本となるストレージデバイスとの同期を行います
Original:
synchronizes with the underlying storage device
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(パブリックメンバ関数of std::basic_istream) [edit]
出力ストリームをフラッシュします
Original:
flushes the output stream
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(関数テンプレート)
出力'\n'と出力ストリームをフラッシュします
Original:
outputs '\n' and flushes the output stream
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(関数テンプレート)