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等待完成异步操作(Waiting for completing of asynchronous operations)

 大家好！ 
 

 有一个io_service对象，方法run（）在线程池中工作。 有一组类，使用ip :: tcp :: socket进行异步写入。 我需要阻止这类类的析构函数，直到他的任务存在于io_service的队列中。 例如，添加方法join（）。 但是阻止析构函数的原因是什么？ 

HI all!
 

There is an io_service object, methods run() works in a thread pool. There are set of classes, which make async write using ip::tcp::socket. I need to block destructor of this kind of class, until his tasks live in the io_service's queue. In example, to add method join(). But what the reason to block the destructor?

原文：https://stackoverflow.com/questions/5389794
更新时间：2021-12-15 12:12

最满意答案

 这就是我所做的，实际上是在javascript中： 
 

function forall (obj, key, func) {
    if (func) func(obj, key);
    var item = obj[key];
    if (item instanceof Object || item instanceof Array) {
        for (var k in item) {
            forall(item, k, func);
        }
    }
}


forall(obj, key, function(obj, key) {
    console.log('object:'+ obj +'['+key+'] = '+ obj[key]);
});


This is what I've done, actually in javascript:
 

function forall (obj, key, func) {
    if (func) func(obj, key);
    var item = obj[key];
    if (item instanceof Object || item instanceof Array) {
        for (var k in item) {
            forall(item, k, func);
        }
    }
}


forall(obj, key, function(obj, key) {
    console.log('object:'+ obj +'['+key+'] = '+ obj[key]);
});

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