Function swap

Source/external/json.hpp:22632–22645

@brief exchanges the values @sa https://json.nlohmann.me/api/basic_json/swap/

	/// @brief exchanges the values
	/// @sa https://json.nlohmann.me/api/basic_json/swap/
	void swap(reference other) noexcept (
		std::is_nothrow_move_constructible<value_t>::value&&
		std::is_nothrow_move_assignable<value_t>::value&&
		std::is_nothrow_move_constructible<json_value>::value&&
		std::is_nothrow_move_assignable<json_value>::value
	)
	{
		std::swap(m_type, other.m_type);
		std::swap(m_value, other.m_value);

		set_parents();
		other.set_parents();
		assert_invariant();
	}

	/// @brief exchanges the values
	/// @sa https://json.nlohmann.me/api/basic_json/swap/