[cfe-dev] DenseMapInfo pass by reference

[Loïc Joly via cfe-dev]

Hello,

Today, I discovered that all specializations of DenseMapInfo pass by 
const reference where I would have used pass by value. For instance:

template<> struct DenseMapInfo<char> {
   static inline char getEmptyKey() { return ~0; }
   static inline char getTombstoneKey() { return ~0 - 1; }
   static unsigned getHashValue(const char& Val) { return Val * 37U; }
   static bool isEqual(const char &LHS, const char &RHS) {
     return LHS == RHS;
   }
};

Do you know why?

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Loïc Joly