Merge pull request #80 from markcjeffrey/add-h3-destructor

[hash] Add destructor to H3HashFamily

src/hash.cpp

@@ -61,6 +61,10 @@ H3HashFamily::H3HashFamily(uint32_t numFunctions, uint32_t outputBits, uint64_t
     }
 }
 
+H3HashFamily::~H3HashFamily() {
+    gm_free(hMatrix);
+}
+
 /* NOTE: This is fairly well hand-optimized. Go to the commit logs to see the speedup of this function. Main things:
  * 1. resShift indicates how many bits of output are computed (64, 32, 16, or 8). With less than 64 bits, several rounds are folded at the end.
  * 2. The output folding does not mask, the output is expected to be masked by caller.

src/hash.h

@@ -39,11 +39,12 @@ class HashFamily : public GlobAlloc {
 
 class H3HashFamily : public HashFamily {
     private:
-        uint32_t numFuncs;
+        const uint32_t numFuncs;
         uint32_t resShift;
         uint64_t* hMatrix;
     public:
         H3HashFamily(uint32_t numFunctions, uint32_t outputBits, uint64_t randSeed = 123132127);
+        virtual ~H3HashFamily();
         uint64_t hash(uint32_t id, uint64_t val);
 };