X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Ftime%2Ftimedelta.h;h=2ce6eeb4e9e42d3d48db4a6d908d0c18c480810c;hp=c73529b0e3f8a9c7ea60bdcc215ce105050643fc;hb=be8ea216d23bf36bdfb2d3e302638782575fc136;hpb=b4806214e905752617691f851717033fd3f266c2

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