Range loops - Writing safe

loop2.cpp

template<typename T>
struct range {
	range(const T &cont) : _b(cont.begin()), _e(cont.end()) {}
	range(typename T::const_iterator b, typename T::const_iterator e) : _b(b), _e(e) {}

	typename T::const_iterator &begin() { return _b; }
	typename T::const_iterator &end() { return _e; }

private:
	typename T::const_iterator _b, _e;
};