//Purpose:
//  Test code based on:
/*
From: Antony Polukhin <antoshkka@gmail.com>
Newsgroups: gmane.comp.lib.boost.devel
Subject: Re: [variant] Please vote for behavior
Date: Wed, 30 Jan 2013 14:58:10 +0400
*/
//
#include <vector>
#include <iostream>

enum type_enum
{ type_scalar
, type_ptr
};

struct object_top
{
    virtual ~object_top()
    {
        std::cout<<"~base()\n";
    }
    virtual type_enum type_get()const
    =0;
};
struct object_scalar : public object_top
{
    type_enum type_get()const
    {
        return type_scalar;
    }
};

union my_union;

struct object_ptr : public object_top
{
    type_enum type_get()const
    {
        return type_ptr;
    }
    
    my_union*my_ptr;
    
    object_ptr(my_union*a_ptr)
    : my_ptr(a_ptr)
    {}    
};
union my_union {
    object_ptr p_;
    object_scalar s_;
    my_union()
    : s_(object_scalar())
    {}
    my_union(my_union*a_p)
    : p_(a_p)
    {}
};

  std::ostream&
operator<<
  ( std::ostream& sout
  , my_union const* u_ptr
  )
  {
      object_ptr const*op=&(u_ptr->p_);
      object_top const*top=op;
      unsigned i=0;
      type_enum te=top->type_get();
      sout<<"\n";
      char const*const indent="  ";
      sout<<indent<<":te["<<i<<"]="<<te<<"\n";
      for(++i; te == type_ptr; ++i)
      {
          u_ptr=op->my_ptr;
          op=&(u_ptr->p_);
          top=op;
          te=top->type_get();
          sout<<indent<<":te["<<i<<"]="<<te<<"\n";
      }
      return sout;
  }

int main()
{
    std::vector<my_union*> vec_us(0);
    std::cout<<"vec_us.size()="<<vec_us.size()<<"\n";
    unsigned i=0;
    my_union*pu=new my_union;
    vec_us.push_back(pu);
    std::cout<<"vec_us["<<i<<"]="<<vec_us[i]<<"\n";
    unsigned const n=3;
    for(++i; i<n; ++i)
    {
      pu=new my_union(vec_us[i-1]);
      vec_us.push_back(pu);
      std::cout<<"vec_us["<<i<<"]="<<vec_us[i]<<"\n";
    }
    std::cout<<"vec_us.size()="<<vec_us.size()<<"\n";
    return 0;
}