从boost :: asio :: io_service中删除所有处理程序，而不调用它们 [英] Remove all handlers from a boost::asio::io_service without calling them

问题描述

我想在重复使用之前，从IO_service中删除所有处理程序。这是可能吗？

I want to remove all handlers from an IO_service right before I reuse it. Is this possible?

我正在编写涉及 asio :: io_service 的单元测试。在每个测试用例之间，我想从全局 io_service 中清除处理程序。我认为 io_service :: reset 会那样，但它不。 reset（）只允许恢复 io_service 。所有的处理程序从最后一个测试用例仍然排队。

I'm writing unit tests that involve an asio::io_service. In between each test case I want to clear the handlers from the global io_service. I thought that io_service::reset would to that but it doesn't. reset() only allows the io_service to be resumed. All of the handlers from the last test case are still queued up.

我只需要这样做单元测试，所以任何疯狂的黑客都可以工作。

I only need to do this for unit testing so any crazy hack would work.

更多信息：

io_service 来自 deadline_timer 成员变量。 deadline_timer 是我测试的代码的一部分，所以我不能改变它的构造。我通过 deadline_timer 的 get_io_service io_service c>方法。

The io_service is from a deadline_timer member variable. The deadline_timer is part of the code I'm testing so I can't change how it's constructed. I get a hold of its io_service via the deadline_timer's get_io_service method.

推荐答案

好吧，我把我的大脑放在这里几天，并提出了一个可行的解决方案。这是所有黑客的母亲。

Well, I racked my brain on this for a few days and came up with a workable solution. It's the mother of all hacks.

void clear( boost::asio::io_service& service )
{
    service.stop();
    service.~io_service();
    new( &service ) boost::asio::io_service;
}

我不知道这对生产代码有多安全。但到目前为止，它似乎工作（没有segfaults，没有奇怪的行为）。

I'm not sure how safe this would be for productions code. But so far it seems to work (no segfaults, no weird behavior).

这篇关于从boost :: asio :: io_service中删除所有处理程序，而不调用它们的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！