From ab9e61f0bc6ed09dae52f538dc6927c54b9216df Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 26 Jul 2015 19:57:58 +0300
Subject: [PATCH] Add negation operator and abs function for TimeDelta

---
 source/time/timedelta.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/time/timedelta.h b/source/time/timedelta.h
index c73529b..2ce6eeb 100644
--- a/source/time/timedelta.h
+++ b/source/time/timedelta.h
@@ -1,6 +1,7 @@
 #ifndef MSP_TIME_TIMEDELTA_H_
 #define MSP_TIME_TIMEDELTA_H_
 
+#include <cstdlib>
 #include <ctime>
 #include <msp/strings/lexicalcast.h>
 #include "rawtime.h"
@@ -32,6 +33,7 @@ public:
 	TimeDelta &operator+=(const TimeDelta &t) { usec += t.usec; return *this; }
 	TimeDelta operator-(const TimeDelta &t) const { return TimeDelta(usec-t.usec); }
 	TimeDelta &operator-=(const TimeDelta &t) { usec -= t.usec; return *this; }
+	TimeDelta operator-() const { return TimeDelta(-usec); }
 
 	template<typename T>
 	TimeDelta operator*(T a) const { return TimeDelta(RawTime(usec*a)); }
@@ -71,6 +73,9 @@ extern const TimeDelta hour;
 extern const TimeDelta day;
 extern const TimeDelta week;
 
+inline TimeDelta abs(const TimeDelta &t) { return t>=zero ? t : -t; }
+using std::abs;
+
 } // namespace Time
 } // namespace Msp
 
-- 
2.43.0