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37 lines
874 B
37 lines
874 B
#include <chrono>
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#include <future>
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#include <iostream>
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#include <thread>
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using namespace std::chrono_literals;
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int main()
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{
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std::future<int> future = std::async(std::launch::async, []()
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{
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std::this_thread::sleep_for(3s);
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return 8;
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});
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std::cout << "waiting...\n";
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std::future_status status;
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do
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{
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status = future.wait_for(100ms);
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switch (status)
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{
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case std::future_status::deferred:
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std::cout << "deferred\n";
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break;
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case std::future_status::timeout:
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std::cout << "timeout\n";
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break;
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case std::future_status::ready:
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std::cout << "ready!\n";
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break;
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}
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}
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while (status != std::future_status::ready);
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std::cout << "result is " << future.get() << '\n';
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}
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