1 files changed, 4 insertions, 0 deletions
diff --git a/common/cyclicint.h b/common/cyclicint.h
index 3b24399..7c06877 100644
--- a/common/cyclicint.h
+++ b/common/cyclicint.h
@@ -49,6 +49,10 @@ class CyclicInt {
 			return v;
 		}
 		
+		CyclicInt operator-() {
+			return -value;
+		}
+		
 		CyclicInt operator-(CyclicInt v) {
 			return value - v.value;
 		}