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std::future::wait

STD：：未来：等待

void wait() const;​(since C++11)

块，直到结果可用为止。valid() == true打完电话后。

如果valid()== false在调用此函数之前。

参数

%280%29

返回值

%280%29

例外

%280%29

注记

鼓励实现在下列情况下检测情况：valid == false在呼叫前抛出一个std::future_error错误条件为std::future_errc::no_state...

例

二次

#include <iostream>
#include <future>
#include <thread>
 
int fib(int n)
{
  if (n < 3) return 1;
  else return fib(n-1) + fib(n-2
}
 
int main()
{
    std::future<int> f1 = std::async(std::launch::async, [](){
        return fib(20
    }
    std::future<int> f2 = std::async(std::launch::async, [](){
        return fib(25
    }
 
    std::cout << "waiting...\n";
    f1.wait(
    f2.wait(
 
    std::cout << "f1: " << f1.get() << '\n';
    std::cout << "f2: " << f2.get() << '\n';
}

二次

产出：

二次

waiting...
f1: 6765
f2: 75025

二次

另见

wait_forwaits for the result, returns if it is not available for the specified timeout duration (public member function)
wait_untilwaits for the result, returns if it is not available until specified time point has been reached (public member function)

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