kv.h

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#pragma once

#include <utility>
#include <string>
#include <vector>
#include <sstream>
#include <iterator>

class KV : public std::pair<std::string, std::string>
{
  template <typename T>
  static std::string make_list(bool first, const T& t)
  {
    std::stringstream s;
    if (!first)
      s << ";";
    s << t;
    return s.str();
  }

  template <typename T, typename... Ts>
  static std::string make_list(bool first, const T& t, Ts&&... list)
  {
    std::stringstream s;
    s << make_list(first, t);
    s << make_list(false, list...);
    return s.str();
  }

  static std::string make_list(bool first, std::vector<std::string> list)
  {
    std::stringstream s;
    std::copy(list.begin(), list.end() - 1, std::ostream_iterator<std::string>(s, ";"));
    s << list.back();

    return s.str();
  }

public:
  template <typename... Ts>
  KV(const std::string& k, const Ts&... list) : std::pair<std::string, std::string>(k, make_list(true, list...))
  {
  }
};