From ef024cf351c9b3b467434ae2a86b7d3e3c4bab9d Mon Sep 17 00:00:00 2001
From: Ben Jones <ben.d.jones@me.com>
Date: Thu, 25 Jun 2015 10:53:12 -0700
Subject: [PATCH] Change += and -= to use inPlace ops and += should be union

---
 Source/ConstraintAttributes.swift | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Source/ConstraintAttributes.swift b/Source/ConstraintAttributes.swift
index a16a04e..06b3dec 100644
--- a/Source/ConstraintAttributes.swift
+++ b/Source/ConstraintAttributes.swift
@@ -157,10 +157,10 @@ internal struct ConstraintAttributes: OptionSetType, BooleanType {
     }
 }
 internal func +=(inout left: ConstraintAttributes, right: ConstraintAttributes) {
-    left = left.intersect(right)
+    left.unionInPlace(right)
 }
 internal func -=(inout left: ConstraintAttributes, right: ConstraintAttributes) {
-    left = left.subtract(right)
+    left.subtractInPlace(right)
 }
 internal func ==(left: ConstraintAttributes, right: ConstraintAttributes) -> Bool {
     return left.rawValue == right.rawValue