# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1489163218 -3600
# Node ID 85416087aa62d23e139ed11ed8d871eafbb4eeb6
# Parent  a0c610ee056232776060d12e6f69f15ab5166e97
Employed specific arithmetic methods for performance when getting new values.
Initialise xrangeiterator with only pertinent details, not xrange objects.

diff -r a0c610ee0562 -r 85416087aa62 lib/__builtins__/span.py
--- a/lib/__builtins__/span.py	Fri Mar 10 15:20:52 2017 +0100
+++ b/lib/__builtins__/span.py	Fri Mar 10 17:26:58 2017 +0100
@@ -79,20 +79,19 @@
 
         "Return an iterator, currently self."
 
-        return xrangeiterator(self)
+        return xrangeiterator(self.start, self.step, self.__len__())
 
 class xrangeiterator:
 
     "An iterator over an xrange."
 
-    def __init__(self, obj):
+    def __init__(self, start, step, count):
 
         "Initialise the iterator with the given 'obj'."
 
-        self.start = obj.start
-        self.count = obj.__len__()
-        self.step = obj.step
-        self.current = obj.start
+        self.current = start
+        self.step = step
+        self.count = count
 
     def next(self):
 
@@ -102,8 +101,8 @@
             raise StopIteration
 
         current = self.current
-        self.current += self.step
-        self.count -= 1
+        self.current = self.current.__add__(self.step)
+        self.count = self.count.__sub__(1)
         return current
 
 def range(start_or_end, end=None, step=1):