Method test_packaged_task

uspace/lib/cpp/src/__bits/test/future.cpp:280–314

    }

    void future_test::test_packaged_task()
    {
        std::packaged_task<int(int)> pt1{};
        test("default constructed packaged_task not valid", !pt1.valid());

        pt1 = std::packaged_task<int(int)>{
            [](int x){
                return x + 1;
            }
        };
        test("packaged_task default constructed and move assigned valid", pt1.valid());

        auto f1 = pt1.get_future();
        test("future from valid packaged_task valid", f1.valid());

        pt1(10);
        test_eq("result stored in future correct", f1.get(), 11);

        std::packaged_task<int()> pt2{
            [](){
                return 42;
            }
        };
        auto f2 = pt2.get_future();
        pt2();
        test_eq("no argument packaged_task return value correct", f2.get(), 42);

        pt2.reset();
        test_eq("reset causes refcount decrement", f2.__state()->refs(), 1);

        auto f3 = pt2.get_future();
        pt2();
        test_eq("invocation after reset returns correct value", f3.get(), 42);
        test("reset recreates state", (f2.__state() != f3.__state()));
    }

    void future_test::test_shared_future()
    {