//Purpose:
//  Provide alternative to soa method suggested here:
//    http://lists.boost.org/Archives/boost/2016/10/231136.php
//===================================================
#include <array>
#include <tuple>
#include <string>
#include <iostream>
  template
  < std::size_t N  //array size
  , typename... T //array types
  >
  using soa_t=
    std::tuple
    < std::array<T,N>...
    >
    ;
int main()
{
  enum citizen
  { first_name
  , last_name
  , salary
  , age
  };
  std::size_t const n=5;//number of citizens
  soa_t<n,std::string,std::string,int,int> soa_citizens;
  int avg = 0;
  int t = 1;
  for( int salary: std::get<salary>(soa_citizens)) {
    avg += (salary  - avg) / t;
    ++t;
  }
  std::cout<<"avg="<<avg<<"\n";
  return 0;
}