X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=macros.lisp;h=d0ba63c629d8e698cc011c6072ce82c20e7d604d;hp=1239eb46b6d7d7cce32b073edc15d0d53a23efe8;hb=a5f8c5c91b2dc670e196147b08dafa0ca23259e4;hpb=be59b033c63cc2cb0e5d516f602f6e932b128a4c

diff --git a/macros.lisp b/macros.lisp
index 1239eb4..d0ba63c 100644
--- a/macros.lisp
+++ b/macros.lisp
@@ -147,6 +147,15 @@
      ,@body))
 
 
+(defmacro time-seconds (&body body)
+  (let ((t1 (gensym)))
+    `(let ((,t1 (get-internal-real-time)))
+       (values
+	(progn ,@body)
+	(coerce (/ (- (get-internal-real-time) ,t1)
+		   internal-time-units-per-second)
+		'double-float)))))
+  
 (defmacro time-iterations (n &body body)
   (let ((i (gensym))
 	(count (gensym)))
@@ -255,8 +264,16 @@
      (format t "~%~%")
      (values)))
 
-(defmacro defconst (symbol value &optional doc)
-   `(defconstant ,symbol (if (boundp ',symbol)
-                             (symbol-value ',symbol)
-                             ,value)
+(defmacro defconstant* (sym value &optional doc)
+  "Ensure VALUE is evaluated only once."
+   `(defconstant ,sym (if (boundp ',sym)
+			  (symbol-value ',sym)
+			  ,value)
      ,@(when doc (list doc))))
+
+(defmacro defvar-unbound (sym &optional (doc ""))
+    "defvar with a documentation string."
+    `(progn
+      (defvar ,sym)
+      (setf (documentation ',sym 'variable) ,doc)))
+