inserting_extracting_raw_json.md

To parse/serialize raw JSON data, such as data from other libraries, one can use the json_raw mapping type. The type requirement for mapping to json_raw is constructable with a char const * and a std::size_t, along with supporting std::begin/std::end.

struct Foo {
  std::string bar;
  std::string raw_json;
};

namespace daw::json {
  template<>
  struct json_data_contract<Foo> {
    using type = json_member_list<
      json_link<"bar", std::string>, 
      json_raw<"raw_json", std::string>
    >;
  
    static auto to_json_data( Foo const & v ) {
      return std::forward_as_tuple( v.bar, v.raw_json );
    }
  };
}