duration.cpp

00001 /*
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00034 
00035 #include <math.h>
00036 #include "ros/duration.h"
00037 
00038 namespace ros
00039 {
00040   void normalizeSecNSecSigned(int32_t &sec, int32_t &nsec)
00041   {
00042     int32_t nsec_part = nsec;
00043     int32_t sec_part = sec;
00044 
00045     while (nsec_part > 1000000000L)
00046     {
00047       nsec_part -= 1000000000L;
00048       ++sec_part;
00049     }
00050     while (nsec_part < 0)
00051     {
00052       nsec_part += 1000000000L;
00053       --sec_part;
00054     }
00055     sec = sec_part;
00056     nsec = nsec_part;
00057   }
00058 
00059   Duration& Duration::operator+=(const Duration &rhs)
00060   {
00061     sec += rhs.sec;
00062     nsec += rhs.nsec;
00063     normalizeSecNSecSigned(sec, nsec);
00064     return *this;
00065   }
00066 
00067   Duration& Duration::operator-=(const Duration &rhs){
00068     sec += -rhs.sec;
00069     nsec += -rhs.nsec;
00070     normalizeSecNSecSigned(sec, nsec);
00071     return *this;
00072   }
00073 
00074   Duration& Duration::operator*=(double scale){
00075     sec *= scale;
00076     nsec *= scale;
00077     normalizeSecNSecSigned(sec, nsec);
00078     return *this;
00079   }
00080 
00081 }