107   class IndexValue;  variable
109   typedef IndexValue value_type;
110   typedef typename vector<IndexValue>::iterator iterator;
111   typedef typename vector<IndexValue>::const_iterator const_iterator;
113   inline const IndexValue& iv(int i) const;
157   static bool less(const IndexValue& a, const IndexValue& b);
226   vector<IndexValue> dense_;
238 class SparseArray<Value>::IndexValue {
244   IndexValue() {}  in IndexValue()  function
245   IndexValue(int index, const Value& value) : second(value), index_(index) {}  in IndexValue()  function
259 const typename SparseArray<Value>::IndexValue&
446 template<typename Value> bool SparseArray<Value>::less(const IndexValue& a,  in less()
447                                                        const IndexValue& b) {  in less()