[Boost-users] boost::ref and boost:::function

From: misiu (misiu75_at_[hidden])
Date: 2007-03-12 04:48:33

Hello,

Could you please tell me how to compare two boost::function objects 
packet with boost::ref. I have container which has boost::function 
elements and to add elements is not a problem but to remove particular 
one I don't know how to do that (compare two boost:ref-s). The problem 
is shown in the code below.

Regards,
Bartek

//code

#include <iostream>
#include <list>
#include <boost/ref.hpp>
#include <boost/function.hpp>

struct test{
   int a;
   void operator() (int aa)
   {  a += aa; }
};

struct function_list {
   std::list<boost::function<void (int v)> > fun_list;

   void add(boost::function<void (int v)> fun)
   {
     fun_list.push_back(fun);
   }

   void remove(boost::function<void (int v)> fun)
   {
     std::list<boost::function<void (int v)> >::iterator iter;

     //HOW TO IMPLEMETN THIS FIND_IF?
     //std::find_if(fun_list.begin(), fun_list.end(), MISSING_PART);

     if(iter != fun_list.end())
       fun_list.erase(iter);
   }
};

int main(int argc, char **argv) {

   test a, b;
   function_list f;

   f.add(boost::ref(a));
   f.add(boost::ref(b));
   //DOES NOT WORK
   f.remove(boost::ref(a));
}