X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Ftime%2Ftimedelta.h;h=1a4274ba3a35c05822ad6f18c43775cf02e592e4;hp=c73529b0e3f8a9c7ea60bdcc215ce105050643fc;hb=HEAD;hpb=b4806214e905752617691f851717033fd3f266c2

diff --git a/source/time/timedelta.h b/source/time/timedelta.h
index c73529b..2ff4bdd 100644
--- a/source/time/timedelta.h
+++ b/source/time/timedelta.h
@@ -1,7 +1,9 @@
 #ifndef MSP_TIME_TIMEDELTA_H_
 #define MSP_TIME_TIMEDELTA_H_
 
+#include <cstdlib>
 #include <ctime>
+#include <msp/core/mspcore_api.h>
 #include <msp/strings/lexicalcast.h>
 #include "rawtime.h"
 
@@ -11,18 +13,18 @@ namespace Time {
 /**
 Represents a quantity of time, such as five seconds.
 */
-class TimeDelta
+class MSPCORE_API TimeDelta
 {
 private:
-	RawTime usec;
+	RawTime usec = 0;
 
 public:
 	/** Constructs a zero TimeDelta. */
-	TimeDelta(): usec(0) { }
+	constexpr TimeDelta() = default;
 
 	/** Constructs a TimeDelta from a plain number.  The purpose of this is to
 	allow serialization together with the raw() function. */
-	explicit TimeDelta(RawTime u): usec(u) { }
+	explicit constexpr TimeDelta(RawTime u): usec(u) { }
 
 	/** Returns the raw number stored inside the TimeDelta.  This should only be used
 	for serialization and the result should not be interpreted in any way. */
@@ -32,6 +34,7 @@ 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)); }
@@ -52,24 +55,27 @@ public:
 	bool operator==(const TimeDelta &t) const { return usec==t.usec; }
 	bool operator!=(const TimeDelta &t) const { return usec!=t.usec; }
 
-	operator const void *() const { return usec ? this : 0; }
+	explicit operator bool() const { return usec; }
 };
 
 template<typename T>
 inline TimeDelta operator*(T a, const TimeDelta &t) { return t*a; }
 
-void operator<<(LexicalConverter &, const TimeDelta &);
+MSPCORE_API void operator<<(LexicalConverter &, const TimeDelta &);
 
 
 // Constants to be used in creation of TimeDeltas
-extern const TimeDelta zero;
-extern const TimeDelta usec;
-extern const TimeDelta msec;
-extern const TimeDelta sec;
-extern const TimeDelta min;
-extern const TimeDelta hour;
-extern const TimeDelta day;
-extern const TimeDelta week;
+constexpr TimeDelta zero(0);
+constexpr TimeDelta usec(1);
+constexpr TimeDelta msec(1000);
+constexpr TimeDelta sec(1000000);
+constexpr TimeDelta min(60*1000000);
+constexpr TimeDelta hour(3600*1000000LL);
+constexpr TimeDelta day(86400*1000000LL);
+constexpr TimeDelta week(7*86400*1000000LL);
+
+inline TimeDelta abs(const TimeDelta &t) { return t>=zero ? t : -t; }
+using std::abs;
 
 } // namespace Time
 } // namespace Msp