-template<typename KeyT, typename ValueT,
- typename KeyInfoT = DenseMapKeyInfo<KeyT>,
- typename ValueInfoT = DenseMapValueInfo<ValueT> >
+// Provide DenseMapInfo for all pairs whose members have info.
+template<typename T, typename U>
+struct DenseMapInfo<std::pair<T, U> > {
+ typedef std::pair<T, U> Pair;
+ typedef DenseMapInfo<T> FirstInfo;
+ typedef DenseMapInfo<U> SecondInfo;
+
+ static inline Pair getEmptyKey() {
+ return std::make_pair(FirstInfo::getEmptyKey(),
+ SecondInfo::getEmptyKey());
+ }
+ static inline Pair getTombstoneKey() {
+ return std::make_pair(FirstInfo::getTombstoneKey(),
+ SecondInfo::getEmptyKey());
+ }
+ static unsigned getHashValue(const Pair& PairVal) {
+ uint64_t key = (uint64_t)FirstInfo::getHashValue(PairVal.first) << 32
+ | (uint64_t)SecondInfo::getHashValue(PairVal.second);
+ key += ~(key << 32);
+ key ^= (key >> 22);
+ key += ~(key << 13);
+ key ^= (key >> 8);
+ key += (key << 3);
+ key ^= (key >> 15);
+ key += ~(key << 27);
+ key ^= (key >> 31);
+ return (unsigned)key;
+ }
+ static bool isEqual(const Pair& LHS, const Pair& RHS) { return LHS == RHS; }
+ static bool isPod() { return FirstInfo::isPod() && SecondInfo::isPod(); }
+};
+
+template<typename KeyT, typename ValueT,
+ typename KeyInfoT = DenseMapInfo<KeyT>,
+ typename ValueInfoT = DenseMapInfo<ValueT> >