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;;; -*- mode: lisp; coding: utf-8 -*-
;;; Toilet Lisp, a Common Lisp subset for the Étoilé runtime.
;;; Copyright (C) 2008 Matthias Andreas Benkard.
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(in-package #:common-lisp)
(export '(1+ 1- =))
(defun 1+ (n)
(etypecase n
(fixnum (add-fixnums n 1))
(integer (%1+ n))))
(defun 1- (n)
(etypecase n
(fixnum (subtract-fixnums n 1))
(integer (%1- n))))
(defun = (x y)
(etypecase x
(fixnum (etypecase y
(fixnum (fixnum-eq x y))
(integer nil)))
(integer (etypecase y
(fixnum nil)
(integer (%= x y))))))
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