range for

range_for.cpp

class CashFlow {
	using CashMap = multimap<Cash::Date, Cash>;
	using const_iterator = multimap<Cash::Date, Cash>::const_iterator;
	multimap<Cash::Date, Cash> _flow;
	//...
};

template<typename T>
struct CashRange {
	using const_iterator = typename T::const_iterator;        
	const const_iterator begin() const { return _begin; }
	const const_iterator end() const { return _end; }
	//...
};