int IoDuration_compare(IoDuration *self, IoDuration *other)
{
if (ISDURATION(other))
{
return Duration_compare(DATA(self), DATA(other));
}
return IoObject_defaultCompare(self, other);
}
IO_METHOD(IoDate, subtract)
{
/*doc Date -(aDurationOrDate)
Return a new Date with the receiver's value minus an amount of time specified by aDuration to the receiver. Returns self.
*/
IoObject *v = IoMessage_locals_valueArgAt_(m, locals, 0);
if (ISDATE(v))
{
double d = Date_secondsSince_(DATA(self), DATA(v));
return IoDuration_newWithSeconds_(IOSTATE, d);
}
else if (ISDURATION(v))
{
IoDate *newDate = IOCLONE(self);
Date_subtractDuration_(DATA(newDate), IoDuration_duration(v));
return newDate;
}
IOASSERT(1, "Date or Duration argument required");
return IONIL(self);
}
IoDuration *IoMessage_locals_durationArgAt_(IoMessage *self, void *locals, int n)
{
IoObject *v = IoMessage_locals_valueArgAt_(self, (IoObject *)locals, n);
if (!ISDURATION(v)) IoMessage_locals_numberArgAt_errorForType_(self, (IoObject *)locals, n, "Duration");
return v;
}
