class BaseClass
{
};

class SomeClass1 : public BaseClass
{
};

class SomeClass2 : public BaseClass
{
};
// ...
class SomeClassN : public BaseClass
{
};

class ClassList
{
private:
    SomeClass1 m_obj1;
    SomeClass2 m_obj2;
    //...     
    SomeClassN m_objN;

    list<BaseClass*> m_list;    
};

S>class BaseClass
S>{
S>};

S>class SomeClass1 : public BaseClass
S>{
S>};

S>class SomeClass2 : public BaseClass
S>{
S>};
S>// ...
S>class SomeClassN : public BaseClass
S>{
S>};

S>class ClassList
S>{
S>private:
S>    SomeClass1 m_obj1;
S>    SomeClass2 m_obj2;
S>    //...     
S>    SomeClassN m_objN;

S>    list<BaseClass*> m_list;    
S>};
S>

ClassList::ClassList()
{
   m_list += &m_obj1, &m_obj2, &m_obj3 ....
}

class ClassList;

class BaseClass
{
public:
   BaseClass(ClassList* p)
   {
      // add this to list
   }
};

class SomeClass1 : public BaseClass
{
public:
   SomeClass1(ClassList *p): BaseClass(p)
   {
   }
};

class SomeClass2 : public BaseClass
{
public:
   SomeClass2(ClassList *p): BaseClass(p)
   {
   }
};

class SomeClass3 : public BaseClass
{
public:
   SomeClass3(ClassList *p): BaseClass(p)
   {
   }
};

class Devices
{
private:
   SomeClass1 m_obj1;
   SomeClass2 m_obj2;
   SomeClass3 m_obj3;    

public:
   Devices(ClassList* p):
      m_obj1(p), m_obj2(p), m_obj3(p) {}
};

class ClassList
{
private:
   char m_objects[sizeof(Devices)];

   list<BaseClass*> m_list;
public:
   ClassList()
   {
      Devices *p;
     
      p = new (m_objects) Devices(this);
   }
};

S>class ClassList
S>{
S>    list<BaseClass*> m_list;    
S>};
S>