std::basic_ostream::flush
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
sync | synchronizes with the underlying storage device (public member function of std::basic_istream) |
|---|---|
flush | flushes the output stream (function template) |
endl | outputs '\n' and flushes the output stream (function template) |
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