std::pair find_position()

in sparseconvnet/SCN/Metadata/sparsehash/internal/densehashtable.h [824:848]

• 23 lines of code
• 8 McCabe index (conditional complexity)

  std::pair<size_type, size_type> find_position(const key_type &key) const {
    size_type num_probes = 0;              // how many times we've probed
    const size_type bucket_count_minus_one = bucket_count() - 1;
    size_type bucknum = hash(key) & bucket_count_minus_one;
    size_type insert_pos = ILLEGAL_BUCKET; // where we would insert
    while ( 1 ) {                          // probe until something happens
      if ( test_empty(bucknum) ) {         // bucket is empty
        if ( insert_pos == ILLEGAL_BUCKET )   // found no prior place to insert
          return std::pair<size_type,size_type>(ILLEGAL_BUCKET, bucknum);
        else
          return std::pair<size_type,size_type>(ILLEGAL_BUCKET, insert_pos);

      } else if ( test_deleted(bucknum) ) {// keep searching, but mark to insert
        if ( insert_pos == ILLEGAL_BUCKET )
          insert_pos = bucknum;

      } else if ( equals(key, get_key(table[bucknum])) ) {
        return std::pair<size_type,size_type>(bucknum, ILLEGAL_BUCKET);
      }
      ++num_probes;                        // we're doing another probe
      bucknum = (bucknum + JUMP_(key, num_probes)) & bucket_count_minus_one;
      assert(num_probes < bucket_count()
             && "Hashtable is full: an error in key_equal<> or hash<>");
    }
  }