[Boost-users] Thread example using a function object and using the return value

15 Aug 2008

      I would like to have a function object that I can use the return value
of its operator() function. Here is what I think best explains my
request

class Apple {
public:

	int operator()( int x )
	{
		int value = x * 2;
		return value;
	}
}

void main (int, char**)
{
	int thread_count = 2; // 2-Core cpu

	// Create a pool of Apple threads
	typedef boost::shared_ptrboost::thread Thread_Ptr_t;
	typedef std::list < Thread_Ptr_t > Thread_Pool_t;
	Thread_Pool_t m_thread_pool;

	// Create threads
	for ( int index = 0;
	      index < thread_count;
	      ++index )
	{
		Thread_Ptr_t new_thread_ptr ( new boost::thread ( boost::bind ( &Apple, _1, )( index ) ) );
		m_thread_pool.push_back ( new_thread_ptr );
	}

	// Wait for all threads to finish
	for ( Thread_Pool_t::iterator pos = m_thread_pool.begin();
	      pos != m_thread_pool.end();
	      ++pos )
	{
		(*pos)->join();
	}

}

Where is the point I should be catching return from the operator()
function? I want the thread to do work and then have the opportunity to
get some results from it. Is there a code example someone can show me?

Stephen

[Boost-users] Thread example using a function object and using the return value

Stephen Torri