int b){std::cout<<"In other thread."<<std::endl;returna+b;}intmain(){auto future_obj=std::async(CalculateSum,12,16);std::cout<<"In Main thread."<<std::endl;int res=future_obj.get();std::cout<<res<<std::endl;}
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...
用法:和std::async一样,也能够返回std::future,通过调用get_future方法。也可以通过future得到线程的返回值。 特点: 1,是个模板类,模板类型是个方法类型,比如double(int),有一个参数,类型是int,返回值类型是double。 std::promise<int> pro;//pro.get_future.get()的返回值为int类型 2,在std::promise<T>...
{ //async异步 std::future<int> result = std::async(std::launch::async,find_result_to_add); //std::future<decltype (find_result_to_add())> result = std::async(find_result_to_add); //auto result = std::async(find_result_to_add); // 推荐的写法用aoto do_other_things(); std...
五、std::promise<> 设计promise<>的目的: 在async()中,我们可以将async()的结果(正确的返回值/或异常)保存在一个future<>中,然后使用future<>.get()去获取,但是在thread中我们如何获取线程中可能产生的数据或者是异常呢? 标准库设计了一个promise<>,它是future<>的配对兄弟,二者配合使用,可以保存一个shared...
Just asynchronous patterns for promises. Latest version: 1.2.0, last published: 3 years ago. Start using asyncc-promise in your project by running `npm i asyncc-promise`. There is 1 other project in the npm registry using asyncc-promise.
var promise = getAsyncPromise("fileA.txt"); promise.then(function(result){ // then 获取文件内容成功时的处理 }).catch(function(error){ // catch 获取文件内容失败时的处理 }); 1. 2. 3. 4. 5. 6. 7. Promise本身是同步的立即执行函数, 当在executor中执行resolve或者reject的时候, 此时是异步...
用法:和std::async一样,也能够返回std::future,通过调用get_future方法。也可以通过future得到线程的返回值。 特点: 1,是个模板类,模板类型是个方法类型,比如double(int),有一个参数,类型是int,返回值类型是double。 std::packaged_task<double(int)>task(func);//func是个方法,有一个参数,类型是int,返回值...
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PromiseKit and Swift 5.5+ Async/Await As of Swift 5.5, the Swift language now offers support for built-in concurrency with async / await. See Async+ for a port of PromiseKit's most useful patterns to this new paradigm. Professionally Supported PromiseKit is Now Available TideLift gives software...