text: #pragma once
  #include "postal_region.h"
  #include <vector>
  #include <cmath>
  class util
  {
  public:
  	static double length(const address_metadata& adr, const address_metadata& centroid);
  	static double length(const address_metadata& adr, const double& x, const double& y);
  	static bool find_f(const std::vector<address_metadata>& arg_v, const address_metadata& arg_e, const int start, const int end);
  	static bool in_f(std::vector<int>& i_v, int subject);
  	static bool in_f(std::vector<address_metadata>& argv, const int s, const int end, address_metadata& argc);
  };