Lifetime of captured variables in QFuture continuation

[brno4758]

Suppose I have this class

class MyClass
{
  public:
    MyClass();
    ~MyClass();
    QFuture<void> m_future;
};

And I want to do something like this:

{
  auto myObject = std::make_shared<MyClass>();
  myObject->m_future = QtFuture::connect(this, &TestFutureLifetimeApp::someSignal).then(
  [myObject]()
  {
    qDebug() << "lambda executed";
  });
}

and assume that the shared_ptr of myObject only exists in the capture clause of the continuation. When this continuation is ran, will myObject destruct? Seems like the answer is yes based on some basic debugging output:

"MyClass::MyClass()"
"lambda executed"
"~MyClass::MyClass()"

but I wanted to double check.

I tried to get this info from the repo, but the closest I could find was QFutureInterfaceBase::runContinuation(), which mentions a concept of QFutureInterfaceBasePrivate::Cleaned.

[SGaist]

Hi and welcome to devnet,

Your myObject shared pointer is captured by the lambda and since it's not shared anywhere else, once the lambda has run, it will be destroyed.

[brno4758]

@SGaist Gotcha thanks for the reply