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std::basic_ostream::flush

性病：基本[医]O流：：冲水

basic_ostream& flush(​​

将未提交的更改写入基础输出序列。

如果rdbuf%28%29是空指针，则不执行任何操作。

否则，作为UnformattedOutputFunction%28自C++11%29。在构造和检查哨兵对象之后，调用rdbuf()->pubsync().如果呼叫返回-1，电话setstate(badbit)...

参数

%280%29

返回值

*this...

例外

可抛std::ios_base::failure如果exceptions()&badbit!=0...

例

二次

#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(
}

二次

产出：

二次

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

二次

另见

syncsynchronizes with the underlying storage device (public member function of std::basic_istream)
flushflushes the output stream (function template)
endloutputs '\n' and flushes the output stream (function template)

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