The test was relying on the fact that, having written 1 byte to both
writeEnd1 and writeEnd2 (and ensured those bytes were written with
waitForBytesWritten()), both read ends would be activated by the next
event loop. It turns out that this was an unreliable assumption, because
the processing of that 1 byte on the second socket may not have happened
yet. So firm up by waiting that both read ends are readable before even
creating the QSocketNotifiers we will read on.
I'm not entirely sure what this test is attempting to test. Its
documentation says it's testing a QAbstractSocket condition, but the
read ends aren't QAbstractSocket (this test should have been in
tst_QAbstractSocket if so). It may be testing the condition that caused
that QAbstractSocket behavior, but that wouldn't be a good test.
Drive-by remove redundant flush()-after-waitForBytesWritten() calls.
Fixes: QTBUG-115154
Pick-to: 6.5 6.6
Change-Id: I61b74deaf2514644a24efffd17708f8071f707ed
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
The test hasn't failed on Windows for a long time, but regularly fails
on macOS in CI, so replace the entry accordingly.
Task-number: QTBUG-115154
Pick-to: 6.6
Change-Id: Ib89d15cb9edafad5dd71f6e3f830d03aaeb16331
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Add the boilerplate standalone test prelude to each test, so that they
can be opened with an IDE without the qt-cmake-standalone-test script,
but directly with qt-cmake or cmake.
Boilerplate was added using the following scripts:
https://git.qt.io/alcroito/cmake_refactor
Manual adjustments were made where the code was inserted in the wrong
location.
Task-number: QTBUG-93020
Change-Id: I28b6d3815c5f43d2c33ea65764f6f3f8f129eaf3
Reviewed-by: Amir Masoud Abdol <amir.abdol@qt.io>
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
`QVariant::convert` may lead to crash or produce garbage data when
attempting to convert a gadget between a pointer type and a value type,
for example from a variant holding a QLocale gadget to a QLocale*
pointer and vice versa. Similarly, `QVariant::view` may crash under the
same conditions.
The reason is that conversion is implemented through copy construction
assuming that both source and target types are either both pointers or
both values. If converting from pointer to value type, the result is
crash during destruction of the QVariant. If converting from value to
pointer type, the result is a QVariant holding a pointer to garbage
data (and possibly crash if pointer is dereferenced).
Similarly, if attempting to convert a pointer to a QObject derived type
to its value type, the system crashes, with a slightly different failure
mode. During `QVariant::convert`, a temporary `QVariant` of the target
type is created. Since objects that can not be copy constructed are
invalid for `QVariant`, the temporary is left empty without constructing
the target value. Then, when attempting to convert from a pointer type
to a value type, the temporary's destructor is incorrectly called on the
owned object. Since the owned object is never constructed, this leads to
a crash.
The proposed fix is to return false from `QMetaType::view`,
`QMetaType::canView`, `QMetaType::convert`, and `QMetaType::canConvert`
if the target type is of different 'pointedness' than the source type.
After this fix, converting and viewing gadgets and QObjects behaves the
same way as primitive types and core types, which already returned false
when converting between value type and pointer type.
Fixes: QTBUG-114797
Pick-to: 6.5 6.6
Change-Id: If5ad764a60f2f3c912070198073b28999d995f17
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Under some circumstances, MSVC seems to complain about SlotArgumentCount
being unused
qobject.h(210): warning C4189: 'SlotArgumentCount': local variable is
initialized but not referenced
note: see reference to function template instantiation
'QMetaObject::Connection QObject::connect<void(__cdecl QAction::* )(bool),
main::<lambda_1>>(const QAction *,Func1,
const QtPrivate::ContextTypeForFunctor<main::<lambda_1>,void>::ContextType *,
Func2 &&,Qt::ConnectionType)' being compiled
This is nonsense, as SlotArgumentCount is used in the next line, to
construct the list of signal arguments, but the workaround to declare
the variable as [[maybe_unused]] is trivial.
Add a connect statement to the test case that creates such a connection.
This does not produce any warning with or without the attribute (and if
it did, the build would fail for CI configuratinos setting -Werror).
Pick-to: 6.6
Fixes: QTBUG-114781
Change-Id: I4ee6f7d57c2836ef3dd9741d037d48181af2cdec
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
This is in line with how QMetaType handles QMetaTypeInterface*. You can
retrieve a const pointer to it.
Pick-to: 6.6
Task-number: QTBUG-113690
Change-Id: Iaf3c10603dc6049a5553987c90006807867abc0d
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
QObjectPrivate::getPropertyAdaptorSlotObject called
connectionsForSignal.
Calling this function is only safe after it has been ensured beforehand that the vector has size > signalIndex. As getPropertyAdaptorSlotObject
is not supposed to modify the vector, it does not resize the vector and it could consequently end up with an out-of-bounds read.
To avoid that issue, we instead first check if the vector can
potentially contain an entry for the signal. If not, we simply return
nullptr, and avoid the call to connectionsForSignal.
The issue and its fix can be verified by running the modified
tst_qproperty test with ASAN enabled. The test is modified in the
following way:
- We first create a signal connection to a dummy slot. Otherwise,
connections.loadRelaxed() would return a nullptr, and the problematic
code would never be reached.
- We add enough signals to ensure that the fooChanged signal will
actually be out of reach (which means >= 8 signals, as the initial
capacity of the vector is 8)
Running the test without ASAN will most likely not result in a failure,
as then the out-of-bounds read will simply read garbage, and the most
likely result is that the cast below will fail.
Pick-to: 6.6 6.5
Change-Id: I18a3c4f52769c2b6491a685abb84f6fcfb44e4d8
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
If we have a rvalue reference to an unshared QVariant, we can avoid
potentially expensive copies, and use move semantics instead.
[ChangeLog][QtCore][QVariant] Added rvalue QVariant overloads of qvariant_cast<T>() and QVariant::value<T>().
[ChangeLog][Potentially Source-Incompatible Changes][QVariant] It is no
longer possible to take the address of a specialization of
qvariant_cast; consider using a lambda function instead.
Change-Id: Ifc74991eadcc31387b755c45484224a3200bb0ba
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
QDeferredDeleteEvent has the loopLevel field, which is a sum of
scope and loop levels found at posting. In sendPostedEvents however,
it is impossible to only use this information to find delete events
posted before the outermost loop (which should be handled by any loop)
based solely on this information, as the scope level essentialy removes
the information on loop level.
Break the loopLevel in two, storing both loop and scope levels in
QDeferredDeleteEvent, so that we can check whether an event was posted
before the outermost event loop (for which we need to compare only the
loop level).
QDeferredDeleteEvent was also made private as it should - it is an
implementation detail that wasn't hidden properly.
Change-Id: I0a607a0bd3a2deb5024acad67f740dbf4338574c
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>
Extract Method fromStdVariantImpl() to share the otherwise
more-or-less identical implementation between the two overloads.
Don't use a constrained template version of fromStdVariantImpl() as
fromStdVariant(), because the constraint would have to be very complex
to continue allowing subclasses of std::variant to be passed.
As a drive-by, mark the valueless_by_exception() path Q_UNLIKELY.
[ChangeLog][QtCore][QVariant] Added overload of fromStdVariant()
taking rvalue std::variant<>s.
Fixes: QTBUG-114134
Change-Id: Ia1c7ae93ab421e6689dc9f2d8d0c2295b23cbbf6
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
When passing an rvalue-reference to QVariant, there is no reason to make
a copy if the type is moveable. Moreover, we know that the pointer which
we construct from the object passed to fromValue non-null. We make use
of both facts by parametrizing custom_construct on
non-nullness and availability of a move-ctor, and then dispatching to
the suitable template.
We need to keep the const T& overload, as otherwise code which
explicitly specializes fromValue and passes a const lvalue to it would
stop to compile.
[ChangeLog][QtCore][QVariant] Added fromValue() overload taking rvalues.
Change-Id: I44fb757d516ef364fe7967bc103b3f98278b4919
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
[ChangeLog][QtCore][QVariant] Implemented in-place construction for
QVariant. The constructor taking std::in_place_type<Type> constructs
an object of type Type directly inside QVariant's storage, without any
further copy or move operations. QVariant::emplace() does the same
when replacing the content of an existing QVariant and tries to reuse
previously-allocated memory.
Fixes: QTBUG-112187
Change-Id: I16614ad701fa3bb583976ed2001bb312f119a51f
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
It's not needed, but makes the point for having a mutable lambda in the
first place.
Change-Id: I483862d6aee90bb62d4b5363c56a80bb05e14df7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This places the first through third parameters on the exact positions
that they will be used to perform the operations in the switch, saving
the compiler from generating a few instructions to move data around. All
ABIs Qt supports that pass any function parameters in registers at all
pass at least 4.
We keep the return type as void (instead of returning bool, for the
Compare case) so the compiler can apply tail-call optimizations for
those two typical cases.
PMF case: https://gcc.godbolt.org/z/9oP5boKfj
Function case: https://gcc.godbolt.org/z/e9vEzd5dj
Functor case: https://gcc.godbolt.org/z/s8Ejjra7P
Change-Id: I3e3bfef633af4130a03afffd175d3e3009c56323
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Amends 3bf5b5f894, after which free
functions and std::bind could no longer be used as callables in
QMetaMethod::invokeMethod.
For free functions to work we need to decay to function pointers when
choosing what type QtPrivate::Callable aliases.
And std::bind has operator() overloads and the return type cannot be
deduced. So simplify the definition of the ZeroArgFunctor - we know
the function prototype if we know the return type.
Add testcase for calling std::bind and free function, and remove the
now unneeded helpers for functor argument and return type deduction.
Change-Id: I54aac5cb6d660267e6b2f5ab05d583e8826cdf9a
Reviewed-by: Zoltan Gera <zoltan.gera@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
The QWeakPointer conversion SMFs cannot actually be used for QObject
payloads, as, for unknown reasons (some comment about vtable this
author doesn't understand), conversion goes through QSharedPointer,
the creation of which throws the checkQObjectShared() warning and
yields a nullptr.
We need to continue to use the QWeakPointer(T*, bool) constructor the
QPointer(T*) ctor also uses.
It's high time we dissociated QPointer from QWeakPointer...
Amends 5f28d367d9.
Fixes: QTBUG-112464
Change-Id: I2f93843af3daf02323d77a4259eaa3745d8de3a8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
We have quite a few Qt API that assumes this, so making this change
helps transitioning them to QDeadlineTimer.
[ChangeLog][Important Behavior Changes] QDeadlineTimer will now
interpret negative millisecond remaining times as "forever", instead of
only the value -1. This brings the API closer in line with other API
like QMutex. This change does not apply to the nanosecond counts in the
API, nor to the API based on std::chrono.
Change-Id: I6f518d59e63249ddbf43fffd175a3e5bead564ae
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Commit b498e1ae3a removed the last
distinction. And since there was no distinction, the code that was
previously under a conditional for CoarseTimer must work for precise
too.
Change-Id: I6f518d59e63249ddbf43fffd175a3eddbd41611a
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
After the recent changes we only have a single implementation of
QSlotObjectBase, which can handle free functions, member functions,
functors, and lambdas. Rename it to callable, and explicitly hide
the static implementation function so that it doesn't become a symbol
of static libraries using Qt.
Also rename makeSlotObject to makeCallableObject, and polish coding
style and comments in the qobjectdefs_impl header a bit.
Change-Id: Id19107cedfe9c624f807cd8089beb80e9eb99f50
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
[ChangeLog][QtCore][QDebug] Added pretty formatting of C++ <chrono>
durations.
[ChangeLog][QtTest] Added pretty formatting of C++ <chrono> durations
for QCOMPARE expressions.
Change-Id: I3b169860d8bd41e9be6bfffd1757cc087ba957fa
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Add helper that allows us to determine the argument list and return type
of a functor. This triggers a compile time error if the functor has
operator()() overloads (we only support zero-argument call operators, but
there might be const/noexcept variations). Use that helper to declare a
ZeroArgFunctor type which also declares a ReturnType and Arguments alias.
Add a Callable alias that now combines FunctionPointer and ZeroArgFunctor
into a single type that we can then use to merge the specializations of
QMetaObject::invokeMethod.
[ChangeLog][Potentially source-incompatible changes] Using a functor
with several operator() overloads in QMetaObject::invokeMethod now causes
a compile time error. Qt would previously ignore const and noexcept
overloads and always call the mutable version on a copy of the functor.
Change-Id: I3eb62c1128014b729575540deab615469290daeb
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Amends 642f799fc6 to avoid unnecessary
copies in between the calls to the QFunctorSlotObject construcotr. We
can't use a univeral reference in the QFunctorSlotObject constructor
as the call is not deduced. So provide two overloads for lvalue and
rvalue references instead.
The compile check in the test now no longer fails as we delay the
storage until one level later, but that's acceptable.
Change-Id: Ide95b4a73c70f6f47698dd1e95138aa5d48ee95d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Remove duplicate test and outdated comment about move-only functors,
and include return value in move-only functor test.
Change-Id: I58dffe0ccf3ec12e7e05e2c9588303da4a7e75ff
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Amend 3c6e9dcc623c9d7281a81174bb3a696e030f30a7 by making sure that
we explicitly move move-only functors into the slot object in the
respective tests, and that failing to do so doesn't compile.
Also add test coverage for mutable lambdas, which work as they do
with connected functors: the connection stores a copy, and calls
don't modify the original functor.
Change-Id: I637e6f407133e2f8f72109b3fe5369a11d19da93
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
This reverts commit 9958edba41, which
incorrectly tested a move-only functor without actually moving the
functor.
Change-Id: I3707f9f8e5055102f7edfb3e1cb9750978356dd7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
QWeakPointer can do the same, so there's no reason to not allow it for
QPointer.
[ChangeLog][QtCore][QPointer] QPointer<T> can now be (move- and
copy-)constructed from QPointer<X>.
Fixes: QTBUG-112464
Change-Id: I77cf5d39974bf2b3ec849b4afc33e286e864821e
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
In Qt >= 6.1, < 6.5, a trivially constructible type would have the
NeedsDestruction flag set, but it's dtor pointer would have been null.
In Qt 6.5, the meaning of the NeedsDestruction flag was changed to be
more aligned with what the name suggests, and thus would only be set for
non-trivially destructible types. For QMetaType this was fine, but
QVariant has a check for acceptable metatypes which attempts to verify
whether a QMetaType is usable for QVariant. The check assumes the
semantics of Qt 6.5, and thus fails for metatypes created by older Qt
versions.
To fix this issue, we increment the QMetaType revision field, and only
check the metatype's destruction support if the revision is high enough.
In theory, that allows passing unsuitable metatypes from older Qt
versions to QVariant; however, such code would have been broken in prior
Qt releases already (which didn't attempt the check), and no code that
used to work in any released Qt version will break (as we simply skip a
check that was passing before).
Fixes: QTBUG-113227
Pick-to: 6.5
Change-Id: I12e02bd97d2c410ea1a36efb0ce2389f21d50a30
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Amends 207aae5560 to make it easy to
create human-friendly error messages. Since the functor-accepting member
functions are not removed from the API, the first compile error will be
that there is no suitable overload of the makeSlotObject helper, which.
With the assert helper, the first error message is easier to understand.
Change-Id: I4878ec35a44ddfa5dc9d9e358d81c3fd40389c0c
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Move-only functors must never be passed by value, so fix the
QFunctorSlotObject constructor accordingly.
This then requires adjustments to the various QMetaMethod::invokeMethod
overloads, as those must also perfectly forwad the functor type.
Enable the previously failing test case for move-only functors.
Change-Id: I9c544fd3ddbc5e1da3ca193236291a9f83d86211
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Amend 207aae5560, as code checker
complained that we std::move'd a potential lvalue. This warning was
valid if the public API did not accept the functor parameter by value.
Fix this by consistently std::forward'ing the parameters through the
call stack, and add a compile-time test. Writing that test revealed that
the helper API didn't work with free functions, so fix that as well. It
also revealed that QFunctorSlotObject couldn't work with a const
functor, which is also fixed by this change.
We cannot support move-only functors with that change, as it requires
a change to QFunctorSlotObject that breaks the QMetaObject test.
Change-Id: Iafd747baf4cb0213ecedb391ed46b4595388182b
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This avoids constructing an object just to copy (later: move) it into a
QVariant.
ChangeLog will be in a follow-up change adding emplace support.
Task-number: QTBUG-112187
Change-Id: I444e580c7d8927d41b3d21d5a521e7c475119e4c
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Functions in Qt that take a callback need to support callables with or
without context objects, and member functions of an object. The
implementation of those overloads follows a pattern that ultimately
results in a QSlotObjectBase implementation being created and
passed to an implementation helper that takes care of the logic.
Factor that common pattern into a new helper template in QtPrivate
that returns a suitable QSlotObjectBase after checking that the
functor is compatible with the specified argument types.
Use that new helper template in the implementation of
QCoreApplication::requestPermission and QHostInfo::lookupHost.
The only disadvantage of centralizing this logic is that we cannot print
a more detailed error message indicating which argument types the
caller expects. However, that information is visible from the detailed
compiler errors anyway.
Change-Id: I24cf0b2442217857b96ffc4d2d6c997c4fae34e0
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
The expected states are:
- nothing sets theMainThread before main()
- theMainThread is reset when the last QObject (the QCoreApplication in
the test) is destroyed
The GUI version of this test appears to leak a lot of QObjects. By the
time this function runs, theMainThread's QThreadData still has a
refcount of 66 on Linux/XCB. The Windows non-GUI version also
failed. Neither situation was investigated to see why objects are
getting leaked.
Pick-to: 6.5
Change-Id: Idd5e1bb52be047d7b4fffffd17507d9e6ef08743
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Amend 4d90c4e74a by clarifying why
moving the QSingleShotObject to the receiver's thread is a good
idea. Move that logic into a separate function and use that also
for the string-based connection.
Optimize the implementation by delaying the timer creation until
after we have moved the QSingleShotTimer object to the target
thread, using a queued metacall if needed to create the timer.
This avoids the creation of the timer in the wrong thread and
then the recreation of the timer in the new thread when QObject
handles QEvent::ThreadChange.
To avoid that the timer is created when it has already expired in
real time, use a deadline timer and fire timeout immediately when
it has expired by the time we get the metacall.
Since the timerId might now not be initialized in the constructor,
initialize it to -1.
Augment the crossThreadSingleShotToFunctor test function by
deliberately not starting the thread until the deadline expired.
[ChangeLog][Core][QTimer] Single-shot timers with a string-based
connection are now started in the receiver's thread, not in the
thread that creates the timer.
Task-number: QTBUG-112162
Change-Id: I3fc94c34c21d9f644da41a2e4c2da479980b8580
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This removes all uses of QDeadlineTimer::t2 member in the .cpp (so it
gets marked [[maybe_unused]]) and greatly simplifies the code.
Change-Id: Ieec322d73c1e40ad95c8fffd17465bd50c1113ea
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
You can't partially specialize a template function, so these
specializations for steady_clock only worked if the Duration parameter
was nanoseconds. This could have been solved with function overloads
instead, but I find the if constexpr code simpler to read.
Pick-to: 6.5
Change-Id: Ieec322d73c1e40ad95c8fffd17468bd73fc2fe24
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
This matches the work that was done for QElapsedTimer. The
QDeadlineTimer::t2 member is now always 0.
This also removes the last distinction of timer types. Originally I had
intended to use CLOCK_MONOTONIC_COARSE on Linux[1], but that created
more problems than was worth, so I abandoned the idea in 2016.
[1] https://codereview.qt-project.org/c/qt/qtbase/+/159933
Change-Id: Ieec322d73c1e40ad95c8fffd17468b313798ef79
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
This commit deletes the direct, low-level functionality that
QElapsedTimer has carried since it was introduced. Everything now uses
only std::chrono::steady_clock and std::chrono::nanoseconds.
QDeadlineTimer temporarily still uses qt_gettime(), which is moved to
qcore_unix.cpp.
Task-number: QTBUG-110059
Change-Id: Ieec322d73c1e40ad95c8fffd174641a469b1eee5
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Avoid capturing the same property multiple times in a binding by
storing them in the BindingEvaluationState. We store them in a
QVarLengthArray array, as the number of properties involved in a binding
is expected to be rather low, so a linear scan is fine.
Avoiding double capture is a good idea in general, as we would otherwise
needlessly reevaluate bindings multiple times, and also needlessly
allocate memory for further observers, instead of using a binding's
inline observer array.
Even more importantantly, our notification code makes assumptions that
notify will visit bindings only exactly once. Not upholding that
invariant leads to memory corruption and subsequent crashes, as
observers allocated by the binding would get freed, even though we would
still access them later.
Fixes: QTBUG-112822
Pick-to: 6.5 6.2
Change-Id: Icdc1f43fe554df6fa69e881872b2c429d5fa0bbc
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
When a context object is provided, then callers expect that the functor
or slot is executed in the thread of the context object. And if the
context object has been destroyed by the time the permission response
is received, the functor shouldn't be called at all.
To implement this, we either have to plumb the call back through a
signal/slot connection and benefit from QObject's infrastructure. This
is not practical here, as we don't have an "engine QObject" that would
emit a signal.
Instead, we can create a QMetaCallEvent explicitly, following what we do
in e.g. QHostInfo, and using a temporary QObject that handles the event
to then call the functor.
Add test coverage.
Pick-to: 6.5
Change-Id: Id878e45b304857304165ab4a7c6aae76fbee46ce
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
This will be helpful in a number of places, in particular in order to
support enums of different sizes in QML. We record the type as string in
the JSON output and as QMetaTypeInterface in the generated C++.
Task-number: QTBUG-112180
Change-Id: I943fac67f8b25b013d3860301416cdd293c0c69e
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Amends 4d90c4e74a, after which the test
became flaky. We need to wait for the functor to be called before
quitting the thread, otherwise we have no guarnatee that any of the
queued metacall events have been processed by the thread. Since
QThread::quit is thread-safe, we can just call it from within the
functor. This guarantees that at least one of the single-shot timers
is processed before we quit.
And since QTimer::singleShot has special code paths for 0-ms timers
(going through an explicitly queued QMetaObject::invokeMethod call
rather than through an actual QSingleShotTimer object), we need to run
the test logic with different timeouts to cover both code paths.
Task-number: QTBUG-112162
Pick-to: 6.5 6.2 5.15
Change-Id: Ide1e7b4b74dcbda72144a0d73ef5f64b0694ddbc
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Currently, Qt assumes that enums always have int as their underlying
type (both in QMetaEnum::keyToValue and in the QML engine). This change
makes it possible to to retrieve the underlying type from an enum's
metaype - or rather, a metatype of an integral type with the same size
and signedness. The use cases aobve don't really rely on the exact same
type. In most cases, we wouldn't even need the signedness, however that
is already available anyway, and it will come in handy once QML supports
bigint, and we need to decide whether we should return
While it would be possible for individual users of this function to
manually query the size and signedness, having a function returning a
metatype offers additional convenience - especially in QML, where the
conversion APIs generally operate on metatypes.
Task-number: QTBUG-27451
Task-number: QTBUG-84055
Task-number: QTBUG-112180
Change-Id: Icf733b42df0ea64017d69f4d94cb7c855d9e3201
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
A null QString used to make a QVariant containing it null in Qt 5, but
this is no longer the case. Add a test that get_if works as expected.
Task-number: QTBUG-111598
Change-Id: I0f3511e1b33f4a9d67755269455680feda22ddca
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This second patch of the series implements get().
Unlike other get() implementations in Qt, don't use my trick with the
constrained friend free function here. Instead, provide the four
overloads manually, like mandated by the standard library for
std::variant (and, indeed, tuple), such that these functions can also
be used on subclasses of QVariant.
[ChangeLog][QtCore][QVariant] Implemented the type-based std::variant
access protocol (get<T>()/get_if<T>()) to allow easier access to the
contained element than the previous solution of casting data(), as
well as to allow generic code to treat QVariant and std::variant the
same. The holds_alternative<T>() function is not provided, since it's
the same as get_if<T> != nullptr. The index-based variant access
functions (get<I>()/get_if<I>()) are also not provided, because,
unlike std::variant, QVariant does not have a bounded number of
alternative types, and QMetaType IDs are not (all) compile-time
constants.
Fixes: QTBUG-111598
Change-Id: Id7bc41f7d91761b3483ec5604f1a4685c8079844
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
