How to add Arguments to bool QMetaObject::invokeMethod(QObject *context, Functor function, FunctorReturnType *ret)

[Toocold]

bool QMetaObject::invokeMethod(QObject *context, Functor function, FunctorReturnType *ret) is an overloaded function.
I don't want to use bool QMetaObject::invokeMethod(QObject *obj, const char member, ...)
const char is not convenient when the function name is changed.

[JonB]

@Toocold
What is your question? There are a number of overloads for QMetaObject::invokeMethod accepting parameters for you to choose from. If you want to use one with a Functor function argument and pass parameters I think you have to use a lambda, e.g. https://forum.qt.io/topic/101182/qmetaobject-invokemethod-with-arguments.

[Toocold]

@JonB Thanks, it is my question.
But I wonder if I use it like this:

QMetaObject::invokeMethod(obj, [=]() { obj.exec() }, Qt::BlockingQueuedConnection);
Souds like this:
QMetaObject::invokeMethod(NULL, [=]() { obj.exec() }, Qt::BlockingQueuedConnection);

Is it Right? And is it thread-safe?

[Christian Ehrlicher]

@Toocold said in How to add Arguments to bool QMetaObject::invokeMethod(QObject *context, Functor function, FunctorReturnType *ret):

Is it Right?

no, the second one will also be executed even if obj is destroyed in the meantime, the first will will not even compile.

And is it thread-safe?

What exactly?

[Toocold]

@Christian-Ehrlicher The obj is created in GUI Thread, and I call this QMetaObject::invokeMethod int the another thread.

QMetaObject::invokeMethod(obj, [=]() { obj.exec() }, Qt::BlockingQueuedConnection);

Will the lambda function be excuted in the GUI Thread?

[Christian Ehrlicher]

@Toocold said in How to add Arguments to bool QMetaObject::invokeMethod(QObject *context, Functor function, FunctorReturnType *ret):

Will the lambda function be excuted in the GUI Thread?

First, your code still does not compile. Second it is executed in the thread where obj lives in since it's a QueuedConnection - it's all documented

[Toocold]

@Christian-Ehrlicher Thanks. It cleared up my confusion