[情報] Hash and Cache's reset()

[ric2k1 (Ric)]

Please note that if you may call the reset() function of cache or hash twice,
you may have double free error...

   void reset() { _numBuckets = 0; delete [] _buckets; }

Please change it to:

   void reset() {
      _numBuckets = 0;
      if (_buckets) delete [] _buckets;
      _buckets = 0;
   }

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