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Reimplement fromSecsSinceEpoch() using setSecsSinceEpoch()

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This avoids repeating the overflow-handling, which setSecsSinceEpoch()
does better in any case. Expand \sa linkage among related functions in
the process.

Change-Id: I929fca19d240b514c8167771a241ede5387bb418
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Edward Welbourne 2022-08-23 18:06:34 +02:00
parent 7833b604b6
commit 47bafe6253
1 changed files with 17 additions and 18 deletions
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35
src/corelib/time/qdatetime.cpp
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@ -3738,7 +3738,7 @@ void QDateTime::setTimeZone(const QTimeZone &toZone)
this object is not valid. However, for all valid dates, this function
returns a unique value.
\sa toSecsSinceEpoch(), setMSecsSinceEpoch()
\sa toSecsSinceEpoch(), setMSecsSinceEpoch(), fromMSecsSinceEpoch()
*/
qint64 QDateTime::toMSecsSinceEpoch() const
{
@ -3790,7 +3790,7 @@ qint64 QDateTime::toMSecsSinceEpoch() const
this object is not valid. However, for all valid dates, this function
returns a unique value.
\sa toMSecsSinceEpoch(), setSecsSinceEpoch()
\sa toMSecsSinceEpoch(), fromSecsSinceEpoch(), setSecsSinceEpoch()
*/
qint64 QDateTime::toSecsSinceEpoch() const
{
@ -3809,7 +3809,7 @@ qint64 QDateTime::toSecsSinceEpoch() const
(\c{std::numeric_limits<qint64>::min()}) to \a msecs will result in
undefined behavior.
\sa toMSecsSinceEpoch(), setSecsSinceEpoch()
\sa setSecsSinceEpoch(), toMSecsSinceEpoch(), fromMSecsSinceEpoch()
*/
void QDateTime::setMSecsSinceEpoch(qint64 msecs)
{
@ -3870,7 +3870,7 @@ void QDateTime::setMSecsSinceEpoch(qint64 msecs)
(Qt::UTC). On systems that do not support time zones this function
will behave as if local time were Qt::UTC.
\sa toSecsSinceEpoch(), setMSecsSinceEpoch()
\sa setMSecsSinceEpoch(), toSecsSinceEpoch(), fromSecsSinceEpoch()
*/
void QDateTime::setSecsSinceEpoch(qint64 secs)
{
@ -4792,7 +4792,7 @@ qint64 QDateTime::currentSecsSinceEpoch() noexcept
If \a spec is Qt::TimeZone then the spec will be set to Qt::LocalTime,
i.e. the current system time zone.
\sa toMSecsSinceEpoch(), setMSecsSinceEpoch()
\sa fromSecsSinceEpoch(), toMSecsSinceEpoch(), setMSecsSinceEpoch()
*/
QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int offsetSeconds)
{
@ -4820,15 +4820,14 @@ QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs, Qt::TimeSpec spec, int of
If \a spec is Qt::TimeZone then the spec will be set to Qt::LocalTime,
i.e. the current system time zone.
\sa toSecsSinceEpoch(), setSecsSinceEpoch()
\sa fromMSecsSinceEpoch(), toSecsSinceEpoch(), setSecsSinceEpoch()
*/
QDateTime QDateTime::fromSecsSinceEpoch(qint64 secs, Qt::TimeSpec spec, int offsetSeconds)
{
constexpr qint64 maxSeconds = std::numeric_limits<qint64>::max() / MSECS_PER_SEC;
constexpr qint64 minSeconds = std::numeric_limits<qint64>::min() / MSECS_PER_SEC;
if (secs > maxSeconds || secs < minSeconds)
return QDateTime(); // Would {und,ov}erflow
return fromMSecsSinceEpoch(secs * MSECS_PER_SEC, spec, offsetSeconds);
QDateTime dt;
QT_PREPEND_NAMESPACE(setTimeSpec(dt.d, spec, offsetSeconds));
dt.setSecsSinceEpoch(secs);
return dt;
}
#if QT_CONFIG(timezone)
@ -4839,7 +4838,7 @@ QDateTime QDateTime::fromSecsSinceEpoch(qint64 secs, Qt::TimeSpec spec, int offs
that have passed since 1970-01-01T00:00:00.000, Coordinated Universal
Time (Qt::UTC) and with the given \a timeZone.
\sa fromSecsSinceEpoch()
\sa fromSecsSinceEpoch(), toMSecsSinceEpoch(), setMSecsSinceEpoch()
*/
QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone)
{
@ -4857,15 +4856,15 @@ QDateTime QDateTime::fromMSecsSinceEpoch(qint64 msecs, const QTimeZone &timeZone
that have passed since 1970-01-01T00:00:00.000, Coordinated Universal
Time (Qt::UTC) and with the given \a timeZone.
\sa fromMSecsSinceEpoch()
\sa fromMSecsSinceEpoch(), toSecsSinceEpoch(), setSecsSinceEpoch()
*/
QDateTime QDateTime::fromSecsSinceEpoch(qint64 secs, const QTimeZone &timeZone)
{
constexpr qint64 maxSeconds = std::numeric_limits<qint64>::max() / MSECS_PER_SEC;
constexpr qint64 minSeconds = std::numeric_limits<qint64>::min() / MSECS_PER_SEC;
if (secs > maxSeconds || secs < minSeconds)
return QDateTime(); // Would {und,ov}erflow
return fromMSecsSinceEpoch(secs * MSECS_PER_SEC, timeZone);
QDateTime dt;
dt.setTimeZone(timeZone);
if (timeZone.isValid())
dt.setSecsSinceEpoch(secs);
return dt;
}
#endif