From 36b209ff2eb60551c16fa3d637d1c375181d62e7 Mon Sep 17 00:00:00 2001
From: Gregory John Casamento <greg.casamento@gmail.com>
Date: Fri, 11 Oct 2019 01:59:46 -0400
Subject: [PATCH] Implement add and subtract methods

---
 Source/NSMeasurement.m | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Source/NSMeasurement.m b/Source/NSMeasurement.m
index 437022982..b3bfc79ca 100644
--- a/Source/NSMeasurement.m
+++ b/Source/NSMeasurement.m
@@ -105,7 +105,7 @@
   NSMeasurement *result = nil;
   double v = 0.0;
 
-  v = _doubleValue + [newMeasurement doubleValue];
+  v = _doubleValue - [newMeasurement doubleValue];
   result = [[NSMeasurement alloc] initWithDoubleValue: v unit: _unit];
   AUTORELEASE(result);