C++0x Lazy list (simple)

lazy.cpp

#include <functional>
template<typename T>
class LazyList 
{
public:
	typedef std::function<T(unsigned int, LazyList<T>*)> Generator;
 
	LazyList(Generator gen)
		: m_gen(gen)
	{
	}
 
	T operator [](unsigned int n) 
	{
		return m_gen(n, this);
	}
private:
	Generator m_gen;
};