Add prototypes of =, 1-, and 1+.

1 files changed, 41 insertions, 0 deletions

diff --git a/numbers.lisp b/numbers.lisp
new file mode 100644
index 0000000..2dd75b2
--- /dev/null
+++ b/numbers.lisp
@@ -0,0 +1,41 @@
+;;; -*- mode: lisp; coding: utf-8 -*-
+;;; Étoilisp/Mulklisp, 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))))))