Break out calendar backend-from-enum as a static function
This lets the registry's populate() avoid recursing into constructors that are typically what (indirectly) called it. This, in turn, makes it possible to assert the constructor from enum gets what it expects. Pick-to: 5.15 Change-Id: I190f9dcfe405e3ee1c6a3f0926fa33cf9ddf64e0 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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@ -59,6 +59,8 @@
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QT_BEGIN_NAMESPACE
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static const QCalendarBackend *backendFromEnum(QCalendar::System system);
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namespace {
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struct CalendarName : public QString
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@ -131,8 +133,10 @@ struct Registry {
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if (populated)
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return;
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for (int i = 0; i <= int(QCalendar::System::Last); ++i)
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(void)QCalendar(QCalendar::System(i));
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for (int i = 0; i <= int(QCalendar::System::Last); ++i) {
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if (!byId[i])
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(void)backendFromEnum(QCalendar::System(i));
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}
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populated = true;
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}
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@ -142,6 +146,32 @@ struct Registry {
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Q_GLOBAL_STATIC(Registry, calendarRegistry);
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static const QCalendarBackend *backendFromEnum(QCalendar::System system)
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{
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switch (system) {
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case QCalendar::System::Gregorian:
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return new QGregorianCalendar;
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#ifndef QT_BOOTSTRAPPED
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case QCalendar::System::Julian:
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return new QJulianCalendar;
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case QCalendar::System::Milankovic:
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return new QMilankovicCalendar;
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#endif
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#if QT_CONFIG(jalalicalendar)
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case QCalendar::System::Jalali:
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return new QJalaliCalendar;
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#endif
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#if QT_CONFIG(islamiccivilcalendar)
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case QCalendar::System::IslamicCivil:
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return new QIslamicCivilCalendar;
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#else // When highest-numbered system isn't enabled, ensure we have a case for Last:
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case QCalendar::System::Last:
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#endif
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case QCalendar::System::User:
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Q_UNREACHABLE();
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}
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return nullptr;
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}
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/*!
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\since 5.14
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@ -169,7 +199,7 @@ Q_GLOBAL_STATIC(Registry, calendarRegistry);
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Most backends are pure code, with no data elements. Such backends should
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normally be implemented as singletons. For a backend to be added to the
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QCalendar::System \c enum, it should be such a singleton, with a case in
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QCalendar::fromEnum()'s switch statement to instantiate it.
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backendFromEnum()'s switch statement (above) to instantiate it.
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Non-singleton calendar backends should ensure that each instance is created
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with a distinct primary name. Later instances attempting to register with a
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@ -642,29 +672,7 @@ const QCalendarBackend *QCalendarBackend::fromEnum(QCalendar::System system)
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Q_ASSERT(calendarRegistry->byId.size() >= size_t(system));
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if (auto *c = calendarRegistry->byId[size_t(system)])
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return c;
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switch (system) {
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case QCalendar::System::Gregorian:
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return new QGregorianCalendar;
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#ifndef QT_BOOTSTRAPPED
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case QCalendar::System::Julian:
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return new QJulianCalendar;
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case QCalendar::System::Milankovic:
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return new QMilankovicCalendar;
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#endif
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#if QT_CONFIG(jalalicalendar)
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case QCalendar::System::Jalali:
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return new QJalaliCalendar;
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#endif
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#if QT_CONFIG(islamiccivilcalendar)
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case QCalendar::System::IslamicCivil:
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return new QIslamicCivilCalendar;
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#else // When highest-numbered system isn't enabled, ensure we have a case for Last:
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case QCalendar::System::Last:
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#endif
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case QCalendar::System::User:
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Q_UNREACHABLE();
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}
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return nullptr;
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return backendFromEnum(system);
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}
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/*!
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@ -737,7 +745,10 @@ QCalendar::QCalendar()
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}
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QCalendar::QCalendar(QCalendar::System system)
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: d(QCalendarBackend::fromEnum(system)) {}
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: d(QCalendarBackend::fromEnum(system))
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{
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Q_ASSERT(d);
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}
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QCalendar::QCalendar(QLatin1String name)
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: d(QCalendarBackend::fromName(name)) {}
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