std::future::wait
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
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返回值
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例外
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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_for | waits for the result, returns if it is not available for the specified timeout duration (public member function) |
|---|---|
wait_until | waits for the result, returns if it is not available until specified time point has been reached (public member function) |
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