充分利用一个boost ::线程成员函数的返回值？ [英] Getting return value from a boost::threaded member function?

问题描述

我有一个工人阶级像下面这样：

I have a worker class like the one below:

class Worker{
public:
  int Do(){
    int ret = 100;
    // do stuff
    return ret;
  }
}

这是为了用的boost ::线程执行和boost ::绑定，如：

It's intended to be executed with boost::thread and boost::bind, like:

Worker worker;
boost::function<int()> th_func = boost::bind(&Worker::Do, &worker);
boost::thread th(th_func);
th.join();

我的问题是，我怎么得到工人的返回值::做什么？

My question is, how do I get the return value of Worker::Do?

先谢谢了。

推荐答案

我不认为你可以得到的返回值。

I don't think you can get the return value.

相反，你可以将该值存储为工人中的一员：

Instead, you can store the value as a member of Worker:

class Worker{
public:
  void Do(){
    int ret = 100;
    // do stuff
    m_ReturnValue = ret;
  }
  int m_ReturnValue;
}

和使用它像这样：

Worker worker;
boost::function<void()> th_func = boost::bind(&Worker::Do, &worker);
boost::thread th(th_func);
th.join();
//do something with worker.m_ReturnValue

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