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我无法理解如何std::async存储任何异常，而不仅仅是从std::exception. 我玩弄下面的代码

#include <iostream>
#include <future>
#include <chrono>

void f()
{
    std::cout << "\t\tIn f() we throw an exception" << std::endl;
    throw 1; // throw an int
}

int main()
{
    std::future<void> fut = std::async(std::launch::async, f);
    std::cout << "Main thread sleeping 1s..." << std::endl;
    std::this_thread::sleep_for(std::chrono::seconds(1)); // sleep one second
    std::cout << "Main thread waking up" << std::endl;
    try
    {
        fut.get();
    }
    catch(...)
    {
        std::cout << "We caught an exception!" << std::endl;
        throw; // rethrow
    }
} …