Function to_string

include/jsoncons_ext/jsonpointer/jsonpointer.hpp:446–450

    using wjson_pointer = basic_json_pointer<wchar_t>;

    inline
    std::string to_string(const json_pointer& ptr)
    {
        return ptr.to_string();
    }

    inline
    std::wstring to_wstring(const wjson_pointer& ptr)