Problem using boost::bind() with template functions having arguments

From:
 =?iso-8859-1?B?Tm9yZGz2dw==?= <per.nordlow@gmail.com>
Newsgroups:
comp.lang.c++
Date:
Thu, 16 Aug 2007 07:57:26 -0700
Message-ID:
<1187276246.191143.250600@g4g2000hsf.googlegroups.com>
Hey there, C++ Coders!

I am learning multi-threading with boost and have come up with the
following code example shown below.
This example implements a test of the producer-consumer design
pattern.
gcc-4.1.2 however complains with errors about my use of boost::bind().
Doesn't bind support this way of specifying a function and its
arguments or should I solve it in another way?

Many thanks in advance,
Per Nordl=F6w

=========== test_threadsafety.cpp begins ====
==========

#include "threadsafe_queue.hpp"
#include <iostream>

using std::cout;
using std::endl;

template <typename T>
void produce(threadsafe_queue<T> & q, uint n)
{
    for (uint i = 0; i < n; i++) {
    T x = i;
    q.push(x);
    cout << "i:" << i << " produced: " << x << endl;
    }
}

template <typename T>
void consume(threadsafe_queue<T> & q, uint n)
{
    for (uint i = 0; i < n; i++) {
    T x = q.wait_pop();
    cout << "i:" << i << " consumed: " << x << endl;
    }
}

int main()
{
    threadsafe_queue<float> q;
    boost::thread pt(boost::bind(produce<float>, q, 10));
    boost::thread ct(boost::bind(consume<float>, q, 10));
    pt.join();
    ct.join();
    return 0;
}

=========== test_threadsafety.cpp ends =====
=========

=========== threadsafe_queue.hpp begins =====
=========

#ifndef PNW__THREADSAFE_QUEUE_HPP
#define PNW__THREADSAFE_QUEUE_HPP

/***
 * @file threadsafe_queue.hpp
 * @brief Thread Safe wrapper on std:queue using Boost.
 */

#include <queue>
#include <iostream>

#include <boost/bind.hpp>
#include <boost/thread/thread.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>

template <typename T>
class threadsafe_queue
{
  std::queue<T> q; ///< Queue.
  boost::mutex m; ///< Mutex.
  boost::condition c; ///< Condition.
public:

  /***
   * Push @p value.
   */
  void push(const T & value) {
    boost::mutex::scoped_lock sl(m); // NOTE: lock mutex
    q.push(value);
  }

  /***
   * Try and pop into @p value, returning directly in any case.
   * @return true if pop was success, false otherwise.
   */
  bool try_pop(T & value) {
    boost::mutex::scoped_lock sl(m); // NOTE: lock mutex
    if (q.size()) {
      value = q.front();
      q.pop();
      return true;
    }
    return false;
  }

  /// Pop into @p value, while possibly waiting forever.
  T wait_pop() {
    boost::mutex::scoped_lock sl(m); // NOTE: lock mutex
    // wait until queue has at least on element()
    c.wait(sl, boost::bind(&std::queue<T>::size, q));
    T value = q.front();
    q.pop();
    return value;
  }
};

#endif

=========== threadsafe_queue.hpp ends =====
=========

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