迁移（未编译通过）。

task/main.cpp

@@ -0,0 +1,60 @@
+#include <future>
+#include <iostream>
+#include <thread>
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+// 1.Promise(生产者)和Future(消费者)
+void workTh1(std::promise<int> prom)
+{
+    std::this_thread::sleep_for(std::chrono::seconds(5));
+    prom.set_value(98);
+}
+
+void testTaskTh1()
+{
+    std::promise<int> prm;
+    auto fut = prm.get_future();
+
+    std::thread t(workTh1, std::move(prm));
+
+    std::cout << "准备打印内容..." << std::endl;
+    std::cout << fut.get() << std::endl;
+    std::cout << "打印内容结束..." << std::endl;
+
+    t.join();
+}
+
+// 2.std::packaged_task本质上是一个包装器, 包装可调用对象，内部使用了std::promise.
+int someFunc(int a, int b)
+{
+    std::this_thread::sleep_for(std::chrono::seconds(3));
+    return a + b;
+}
+
+void testTaskTh2()
+{
+    std::packaged_task<int(int, int)> pt(someFunc);
+    auto fut = pt.get_future();
+    std::thread t(std::move(pt), 33, 55);
+    t.join();
+    std::cout << __FUNCTION__ << " over, ret = " << fut.get() << std::endl;
+}
+
+// 3.异步运行任务（更高级的用法，不用关心开线程打包这种操作）
+void testTaskTh3()
+{
+    auto fut = std::async(std::launch::async, someFunc, 11, 22);
+    std::cout << __FUNCTION__ << " over, ret = " << fut.get() << std::endl;
+}
+
+int main()
+{
+#ifdef _WIN32
+    SetConsoleOutputCP(CP_UTF8);
+#endif
+    testTaskTh3();
+    return 0;
+}