[Boost-users] [shared_ptr] Using a custom delete function that is a class member function

Subject: [Boost-users] [shared_ptr] Using a custom delete function that is a class member function
From: Ryan McConnehey (mccorywork_at_[hidden])
Date: 2009-10-09 19:32:20

I have a class that provides a shared_ptr number.  At the end of the 
number's life cycle it should be placed back on a list of available 
numbers.  The shared_ptr's custom deleter function looks like what I 
need.  I'm able to get a free function to compile as the deleter just 
fine.  In trying to use a class member function as the custom deleter 
I've run into compile errors.  I'm not sure where I'm going wrong.  I 
know the custom deleter need to be copy constructible and I'm probably 
breaking some assumed requirement.  Any help on what I'm doing wrong 
would be appreciated. 

Ryan

class CTNGenerator {
public:
CTNGenerator(void) {
  m_AvailableCTNs.resize(20);
  unsigned short startValue = 15;

  for (ctns::iterator itor = m_AvailableCTNs.begin(); itor != 
m_AvailableCTNs.end(); ++itor) {
    //This compiles fine.
    boost::bind(boost::mem_fun(&CTNGenerator::makeCTNAvailable), this);
    //Placing the call as the custom delete function doesn't compile.
    *itor = bus(new unsigned short(startValue++), 
boost::bind(boost::mem_fun(&CTNGenerator::makeCTNAvailable, this)));
  }
}

private:
void CTNGenerator::makeCTNAvailable(unsigned short * ctn) {
   m_AvailableCTNs.push_back(boost::shared_ptr<unsigned short>(ctn));
}

private: 
  typedef boost::shared_ptr<unsigned short>  bus;
  typedef std::list<bus>                                   ctns;
  ctns                                                             
m_AvailableCTNs;
};