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TimeInterval.cpp
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TimeInterval.cpp
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#include "TimeInterval.h"
#include <iomanip>
TimeInterval::TimeInterval()
{
intervalDays = 0;
intervalSeconds = 0;
intervalMicroSeconds = 0;
}
TimeInterval::TimeInterval(long days, long seconds, long u_seconds)
{
intervalDays = days;
intervalSeconds = seconds;
intervalMicroSeconds = u_seconds;
this->normalize();
}
TimeInterval::~TimeInterval()
{
// Nothing to do...
}
void TimeInterval::setInterval(long days, long seconds, long u_seconds)
{
intervalDays = days;
intervalSeconds = seconds;
intervalMicroSeconds = u_seconds;
this->normalize();
}
TimeInterval TimeInterval::operator+(const TimeInterval &inc) const
{
TimeInterval result;
result.intervalDays = intervalDays + inc.intervalDays;
result.intervalSeconds = intervalSeconds + inc.intervalSeconds;
result.intervalMicroSeconds = intervalMicroSeconds + inc.intervalMicroSeconds;
// Normalize the resulting sum
result.normalize();
return result;
}
TimeInterval& TimeInterval::operator+=(const TimeInterval &inc)
{
*this = *this + inc;
return *this;
}
TimeInterval TimeInterval::operator-(const TimeInterval &dec) const
{
TimeInterval result;
result.intervalDays = intervalDays - dec.intervalDays;
result.intervalSeconds = intervalSeconds - dec.intervalSeconds;
result.intervalMicroSeconds = intervalMicroSeconds - dec.intervalMicroSeconds;
// Normalize the resulting difference
result.normalize();
return result;
}
TimeInterval& TimeInterval::operator-=(const TimeInterval &dec)
{
*this = *this - dec;
return *this;
}
TimeInterval TimeInterval::operator*(long n) const
{
TimeInterval result;
result.intervalDays = n * intervalDays;
result.intervalSeconds = n * intervalSeconds;
result.intervalMicroSeconds = n * intervalMicroSeconds;
// Normalize the resulting product
result.normalize();
return result;
}
TimeInterval operator*(long n, const TimeInterval &t)
{
return t * n;
}
TimeInterval& TimeInterval::operator*=(long n)
{
*this = *this * n;
return *this;
}
bool operator==(const TimeInterval &t1, const TimeInterval &t2)
{
return (t1.intervalDays == t2.intervalDays) &&
(t1.intervalSeconds == t2.intervalSeconds) &&
(t1.intervalMicroSeconds == t2.intervalMicroSeconds);
}
bool operator!=(const TimeInterval &t1, const TimeInterval &t2)
{
return !(t1 == t2);
}
bool operator<(const TimeInterval &t1, const TimeInterval &t2)
{
//
// The correctness of this comparison relies on the fact that the signs of
// each of the components of the interval are the same, and also that the number
// of microseconds is less than one second and the number of seconds is less
// than one day. We only need to find a difference in the most significant
// component (days > seconds > microseconds) to determine the result.
//
if (t1.intervalDays < t2.intervalDays) {
return true;
}
else if (t1.intervalDays == t2.intervalDays) {
if (t1.intervalSeconds < t2.intervalSeconds) {
return true;
}
else if (t1.intervalSeconds == t2.intervalSeconds) {
if (t1.intervalMicroSeconds < t2.intervalMicroSeconds) {
return true;
}
}
}
return false;
}
bool operator<=(const TimeInterval &t1, const TimeInterval &t2)
{
return !(t1 > t2);
}
bool operator>(const TimeInterval &t1, const TimeInterval &t2)
{
return (t2 < t1);
}
bool operator>=(const TimeInterval &t1, const TimeInterval &t2)
{
return !(t1 < t2);
}
std::ostream& operator<<(std::ostream &output, const TimeInterval &t)
{
//
// Printing the value of a TimeInterval is complicated by the separate storage
// of seconds and microseconds, which get printed together in the form X.XXXXXX s.
// When microseconds are negative, we don't need to print the "-" character in front,
// since it will be printed in front of the seconds (which may be zero).
//
if (t.intervalMicroSeconds >= 0) {
output << "[" << t.intervalDays << " days, "
<< t.intervalSeconds << "." << std::setw(6) << std::setfill('0') << t.intervalMicroSeconds << " s]";
}
else {
if (t.intervalSeconds == 0) {
output << "[" << t.intervalDays << " days, "
<< "-" << t.intervalSeconds << "." << std::setw(6) << std::setfill('0') << -t.intervalMicroSeconds << " s]";
}
else {
output << "[" << t.intervalDays << " days, "
<< t.intervalSeconds << "." << std::setw(6) << std::setfill('0') << -t.intervalMicroSeconds << " s]";
}
}
return output;
}
void TimeInterval::normalize()
{
long seconds;
long days;
//
// Roll microseconds beyond 999999 into seconds
//
seconds = intervalMicroSeconds / 1000000;
intervalMicroSeconds %= 1000000;
intervalSeconds += seconds;
//
// Roll seconds beyond 86399 into days
//
days = intervalSeconds / 86400;
intervalSeconds %= 86400;
intervalDays += days;
//
// Ensure that sign of all components is the same as the most significant
// non-zero component.
//
if (intervalDays < 0) {
if (intervalMicroSeconds > 0) {
intervalMicroSeconds -= 1000000;
intervalSeconds++;
}
if (intervalSeconds > 0) {
intervalSeconds -= 86400;
intervalDays++;
}
}
else if (intervalDays > 0) {
if (intervalMicroSeconds < 0) {
intervalMicroSeconds += 1000000;
intervalSeconds--;
}
if (intervalSeconds < 0) {
intervalSeconds += 86400;
intervalDays--;
}
}
else {
if (intervalSeconds < 0) {
if (intervalMicroSeconds > 0) {
intervalMicroSeconds -= 1000000;
intervalSeconds++;
}
}
else if (intervalSeconds > 0) {
if (intervalMicroSeconds < 0) {
intervalMicroSeconds += 1000000;
intervalSeconds--;
}
}
}
}