From 9f2106ed94b78befe868f5fc260115131071c3d5 Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Sat, 18 Jul 2015 10:39:25 -0700
Subject: [PATCH] Advance rotor by `count` positions

Default value of parameter is 1
---
 Enigma/Rotor.swift | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Enigma/Rotor.swift b/Enigma/Rotor.swift
index 2516d76..d37a345 100644
--- a/Enigma/Rotor.swift
+++ b/Enigma/Rotor.swift
@@ -36,8 +36,8 @@ class Rotor {
         self.series = series
     }
 
-    func advance() {
-        position = position.successor() % Rotor.alphabet.count
+    func advance(count: Int = 1) {
+        position = (position + count) % Rotor.alphabet.count
     }
 
     func encode(c: Character) throws -> Character {