#include <boost/mpl/vector.hpp>
#include <boost/mpl/push_front.hpp>
#include <boost/mpl/push_back.hpp>
#include <boost/mpl/replace.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/int.hpp>
#include <boost/mpl/assert.hpp>
 
class A{} ; class B{} ; class C{} ; class D{} ; class E{} ;
 
int main()
{
  using namespace boost ;
 
  typedef mpl::vector<A,B> seq_ab ;
  typedef mpl::push_front< seq_ab, C >::type seq_cab ;
  typedef mpl::push_back< seq_cab, D >::type seq_cabd ;
  typedef mpl::replace< seq_cabd, B, E >::type seq_caed ;
 
  BOOST_MPL_ASSERT(
   ( mpl::is_same< mpl::at< seq_caed, mpl::int_<2> >, E > ) ) ;
}

class base
{
   // blabla
};
 
class derived : public base
{
    // linked (derived) class
};

class A { 
 
};
class B {
A a;
};

#include <iostream>
 
namespace ClassSpace
{
	class a 
	{
	public:
	    a()	{ std::cout << "Created A\n";}
	    ~a(){ }
	};
	class b 
	{
	public:
	    b(){  std::cout << "Created B\n";}
	    ~b(){}
	};
}
 
int main()
{
	ClassSpace::a Ca;
	ClassSpace::b Cb;
	std::cin.get();
	return 0;
}