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[gacela.git] / src / gacela_misc.scm

diff --git a/src/gacela_misc.scm b/src/gacela_misc.scm
index b75a44eb1cf91a4d1c1158db9c754a5c06687b0a..42c8841f7e0bf132848a09eab5a5b315b1f91a58 100644 (file)
--- a/src/gacela_misc.scm
+++ b/src/gacela_misc.scm
@@ -15,8 +15,20 @@
 ;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+
+;;; Additional modules
+
+(use-modules (srfi srfi-1))
+
+
+;;; Functions
+
 (define (nearest-power-of-two n)
   (define (power p n)
     (cond ((> (* p 2) n) p)
          (else (power (* p 2) n))))
   (power 1 n))
+
+(define-macro (pushnew elem list)
+  `(cond ((not (find (lambda (e) (eq? e ,elem)) ,list))
+         (set! ,list (cons ,elem ,list)))))