Function to_string

Source/external/json.hpp:13749–13757

@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/