Method seek_to

src/test/common/ObjectContents.h:44–55

      return pos;
    }
    void seek_to(uint64_t _pos) {
      if (pos > _pos ||
	  (iter != parent->seeds.end() && _pos >= iter->first)) {
	iter = parent->seeds.upper_bound(_pos);
	--iter;
	current_state = iter->second;
	current_val = rand_r(&current_state);
	pos = iter->first;
	++iter;
      }
      while (pos < _pos) ++(*this);
    }

    void seek_to_first() {
      seek_to(0);