future 是一个对象,可以从某个提供对象或函数中检索值,如果在不同线程中,则可以正确同步此访问。 “有效” future 对象,通过调用一下函数之一来构造: async promise::get_future packaged_task::get_future future 对象仅在他们有效时才有用。默认构造的 future 对象五项(除非移动分配一个有效的 future)。 在有效...
<future>:该头文件主要声明了 std::promise, std::package_task 两个 Provider 类,以及 std::future 和 std::shared_future 两个 Future 类,另外还有一些与之相关的类型和函数,std::async() 函数就声明在此头文件中。 #include <iostream> #include <utility> #include <thread> #include <chrono> #includ...
课课家教育提供async、future、packaged_task、promise视频教程,所属课程:C++基础到进阶视频教程,本节课 ,老师要讲解如下话题:(1)std::async、std::future创建后台任务并返回值(2)std:: packaged_task (3)std:: promise (4)小结
std::promise<int> p; std::future<int> f = p.get_future(); // can be copy std::shared_future<int> sf = f.share(); std::future<int> fu1 = std::async(std::launch::async, factorial, sf); std::future<int> fu2 = std::async(std::launch::async, factorial, sf); std::futu...
std::future<std::string> f = task.get_future(); std::thread t(std::move(task), std::string("package task test")); t.detach(); // 调用 f.get 返回结果, 但是须阻塞等到任务执行完成 std::cout << "main tid:" << std::this_thread::get_id() << ", result: " << f.get() ...
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该项目提供了基于 C++20 无栈协程(Lazy)、有栈协程(Uthread) 以及 Future/Promise 等异步组件，能够...
Compiler warning (level 3) C5231 the expression 'co_await promise.final_suspend()' must be non-throwing Compiler warning (level 1) C5232 in C++20 this comparison calls 'name' recursively Compiler warning (level 4, off) C5233 explicit lambda capture 'identifier' is not used Compiler warning...
Promis - The easiest Future and Promises framework in Swift. No magic. No boilerplate. Bluebird.swift - Promise/A+, Bluebird inspired, implementation in Swift 4. Promise - A Promise library for Swift, based partially on Javascript's A+ spec. promises - Google provides a synchronization constru...