text: //
  // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
  //
  // Distributed under the Boost Software License, Version 1.0. (See accompanying
  // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  //
  // Official repository: https://github.com/cppalliance/json
  //
  
  #include <boost/json.hpp>
  
  using namespace boost::json;
  
  value&
  path( value& jv, std::size_t index)
  {
      array *arr;
      if(jv.is_null())
          arr = &jv.emplace_array();
      else
          arr = &jv.as_array();
      if(arr->size() <= index)
          arr->resize(index + 1);
      return (*arr)[index];
  }
  
  value&
  path( value& jv, string_view key )
  {
      object* obj;
      if(jv.is_null())
          obj = &jv.emplace_object();
      else
          obj = &jv.as_object();
      return (*obj)[key];
  }
  
  template<class Arg0, class Arg1, class... Args>
  value&
  path( value& jv, Arg0 const& arg0, Arg1 const& arg1, Args const&... args )
  {
      return path( path( jv, arg0 ), arg1, args... );
  }
  
  int
  main(int, char**)
  {
      value jv;
      path( jv, "user:config", "authority", "router", 0, "users" ) = 42;
      return EXIT_SUCCESS;
  }
  