Re: [Boost-users] How to pass data to thread

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-10-02 06:21:13

Monica Gretzer wrote:

> Hi,
>    
>   I want to pass data to a thread function. My question is- what is wrong
>   with this code? The compiler error output is: "error: function returning
>   a function". In the code below I am trying to pass an int to the thread
>   function.
>    
>   // ------------- code: how to pass data to the thread ? ----------------
>   #include <boost/thread/thread.hpp>
> #include <boost/bind.hpp>
> #include <iostream>
> 
> using namespace std;
> 
> class TestThread
> {
> public:
>   void thread(int a);
>   void CreateThreads(void);
> };
> 
> void TestThread::thread(int a)
> {
>   cout << "I am thread " << a << endl;
> }
> 
> void TestThread::CreateThreads()
> {
>   boost::thread t1( boost::bind( &TestThread::thread, 10));
>   boost::thread t2( boost::bind( &TestThread::thread, 20));

The ::thread method is non-static, and you don't pass any object to bind.
You should have

   boost::bind (&TestThread::thread, some_object, 10)

HTH,
Volodya