(svn r24528) -Fix: [NewGRF] RandomAction 84 should interpret register 100 as signed.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/vehicle_base.h b/src/vehicle_base.h
index 6c9ba195e..ab06695e2 100644
--- a/src/vehicle_base.h
+++ b/src/vehicle_base.h
@@ -534,6 +534,22 @@ public:
 	}
 
 	/**
+	 * Get the vehicle at offset \a n of this vehicle chain.
+	 * @param n Offset from the current vehicle.
+	 * @return The new vehicle or NULL if the offset is out-of-bounds.
+	 */
+	inline const Vehicle *Move(int n) const
+	{
+		const Vehicle *v = this;
+		if (n < 0) {
+			for (int i = 0; i != n && v != NULL; i--) v = v->Previous();
+		} else {
+			for (int i = 0; i != n && v != NULL; i++) v = v->Next();
+		}
+		return v;
+	}
+
+	/**
 	 * Get the first order of the vehicles order list.
 	 * @return first order of order list.
 	 */