Function to_string

extern/json/json.hpp:13787–13795

@brief return a string representation of the JSON pointer @sa https://json.nlohmann.me/api/json_pointer/to_string/

    /// @brief return a string representation of the JSON pointer
    /// @sa https://json.nlohmann.me/api/json_pointer/to_string/
    string_t to_string() const
    {
        return std::accumulate(reference_tokens.begin(), reference_tokens.end(),
                               string_t{},
                               [](const string_t& a, const string_t& b)
        {
            return detail::concat(a, '/', detail::escape(b));
        });
    }

    /// @brief return a string representation of the JSON pointer
    /// @sa https://json.nlohmann.me/api/json_pointer/operator_string/