QMetaObject::invokeMethod() with arguments

[btse]

Hi,

I would like to use the Functor overload of the invokeMethod() functions since it does compile time checks that the function actually exists. However, how do I pass arguments using this method? Is it possible?

[raven-worx]

@btse
simply capture them in your lambda function?
You would anyway specify them at the time you call invokeMethod

QMetaObject::invokeMethod(obj, [var1,var2]() {
  ...
});

[btse]

@raven-worx Thanks. I originally wanted to call a member function, but I guess I can wrap that call with a lambda function.

Note that dest lives in a separate thread. Should this be thread safe?

connect(
           lineedit,
           &QLineEdit::returnPressed,
           [=]()
           {
              QString text = lineedit->text();
              QMetaObject::invokeMethod(dest,
                                        [=]() 
                                        {
                                           dest->setOutputFilePath(text);
                                        },
                                        Qt::QueuedConnection
              );
           }
);

[raven-worx]

@btse said in QMetaObject::invokeMethod() with arguments:

Note that dest lives in a separate thread. Should this be thread safe?

since you explicitly use QueuedConnection yes. You can also use AutoConnection (the default anyway) to let Qt decide.

[btse]

@raven-worx Yeah I guess the whole lambda capturing is something I still need to get comfortable with, especially when it's used in a multi-thread context.