How to call operator()() as a slot?

SRaD

I start a worker thread like so ...

{
    check = new CheckTool(args);
    check->moveToThread(&checkThread);

    connect(&checkThread, &QThread::finished, analyses,
        &QObject::deleteLater);
    connect(this, &MainWindow::startCheckTool, check,
        &CheckTool::doWork);
    connect(check, &CheckTool::notifyCheckToolFinished, this,
        &MainWindow::checkToolFinished);

    checkThread.start();
}

but I have

void CheckTool::operator()() { ... }

defined as a CheckTool function. How can I call this in the following connect instead of using &CheckTool::doWork?

connect(this, &MainWindow::startCheckTool, check,
    &CheckTool::doWork);

jsulm

@SRaD Should be enough to capture "this" as "check" is a member variable:

connect(this, &MainWindow::startCheckTool, this, [this] () -> void { check->operator () (); });

kshegunov

You can't because your CheckTool isn't copyable as it's derived from QObject. You can wrap it, though:

connect(this, &MainWindow::startCheckTool, check, [check] () -> void { check->operator () (); });

SRaD

I tried that and got the following error.

main-window.cpp: In member function ‘void MainWindow::setupCheckTool()’:
main-window.cpp:448:4: error: capture of non-variable ‘MainWindow::check’
  448 |   [check] () -> void {check->operator()(); });
      |    ^~~~~~~~
In file included from main-window.cpp:8:
main-window.h:72:17: note: ‘CheckTool* MainWindow::check’ declared here
  72 |   CheckTool *check;
        |           ^~~~~~~~
main-window.cpp: In lambda function:
main-window.cpp:448:26: error: ‘this’ was not captured for this lambda function
  448 |   [check] () -> void {check->operator()(); });
          |                   ^~~~~~~~
main-window.cpp:448:26: error: invalid use of non-static data member ‘MainWindow::check’
In file included from main-window.cpp:8:
main-window.h:72:17: note: declared here
   72 |   CheckTool *check;
  |              ^~~~~~~~

I don't know why it seems to think check is a member function. CheckTool *check; is a private member of class MainWindow.

jsulm

@SRaD Should be enough to capture "this" as "check" is a member variable:

connect(this, &MainWindow::startCheckTool, this, [this] () -> void { check->operator () (); });