% xlC -qversion
C for AIX version 6.0.0.0radhas@peibm116:/remote/us01home5/radhas/test_prog% cat boost_ptr_vec.cpp 
#include <boost/ptr_container/ptr_vector.hpp>
#include <string>
#include <iostream>
using namespace std;
class animal : boost::noncopyable
{
public:
    virtual      ~animal()   {}
    virtual void eat()       = 0;
    virtual int  age() const = 0;
    // ...
  };
class mammal:public animal
{
public:
string name;
mammal(string set_name)
{
name=set_name;
}
void eat()
{
}
int  age() const
{
return 1;
}
};
class bird:public animal
{
public:
string name;
bird(string set_name)
{
name=set_name;
}
void eat()
{
}
int  age() const
{
return 1;
}
};

class zoo
{
    boost::ptr_vector<animal> the_animals;
public:

    void add_animal( animal* a )
    {
        the_animals.push_back( a );
    }
};

int main()
{
zoo the_zoo;
the_zoo.add_animal( new mammal("joe") );
the_zoo.add_animal( new bird("dodo") );
        
}