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From: Henrik Kuhn (henrik.kuhn_at_[hidden])
Date: 2001-11-21 09:55:32

Hi boosters,

I'm struggling with the boost::iterator_adaptors, in detail with the 
indirect_iterator stuff.
During my search in the boost group, George A. Heintzelman (message 
#18183) depicted nearly the same I need. The difference is I'm using 
shared pointers as the vector template argument.

I working with Borland C++ Builder 5.0 Update Pack 1 and on compiling 
the following code I get the error message: 
[C++ Error] compressed_pair.hpp(362): E2312 'base' is not an 
unambiguous base class of 'compressed_pair<shared_ptr<foo>*, 
indirect_iterator_policies>'

Is there something wrong towards my useage of the 
boost::indirect_iterator_pair_generator.

Regards,
Henrik

//--------------------------------------------------------------------
#include <iostream>
#include <boost/utility.hpp>
#include <boost/smart_ptr.hpp>
#include <vector>
#include <boost/iterator_adaptors.hpp>
#pragma hdrstop

//--------------------------------------------------------------------

class foo : boost::noncopyable
{
 public:
    foo(const int a_) : m_a(a_) {}

    int get() { return m_a; }

 private:
    int m_a;
};

#pragma argsused
int main(int argc, char* argv[])
{
  typedef boost::shared_ptr<foo>                foo_ptr_t;
  typedef std::vector<foo_ptr_t>                foo_ptr_vect_t;
  typedef foo_ptr_vect_t::iterator              vect_iterator;

  typedef boost::indirect_iterator_pair_generator<
        vect_iterator,
        foo, foo&, const foo&,
        std::random_access_iterator_tag,
        foo*,
        const foo*>                             pair_indirectors;
  typedef pair_indirectors::iterator            indirector;

  foo_ptr_vect_t v(4);

  for(std::size_t i=0; i<v.size(); ++i)
    v[i].swap( foo_ptr_t(new foo(i)) );

    
  // the following line produces an compiler error 
  indirector i(v.begin()),
//  indirector end(v.end());

//  while(i!=end)
//  {
//    std::cout << i->get() << '\n';
//    ++i;
//  }

  return 0;
}
//--------------------------------------------------------------------