main.cpp

// g++ main.cpp -std=gnu++0x
#include <vector>
#include <memory> // shared_ptr

template <class T>
class Base
{
public:
	Base(T value)
	:m_value(value)
   	{}

	T value()
   	{
		return m_value;
	}

	void value(T new_value)
   	{
		m_value = new_value;
	}

protected:
	T m_value;
};

class Integer : public Base<int>
{
	Integer(int new_value)
	:Base<int>(new_value)
	{}
};

int main() {
	std::vector<std::shared_ptr<Base<auto> > > list;
	return list;
}