QtConcurrent::BlockingMap using member functions (with an argument) without C++11 or boost

[kamui]

Hello,

How to do the exact same thing without C++11 (or boost) ?

 QtConcurrent::BlockingMap(fileinfolist, [=](QFileInfo fi){
        myMemberFunction(fi);
}

[KroMignon]

@kamui said in QtConcurrent::BlockingMap using member functions (with an argument) without C++11 or boost:

How to do the exact same thing without C++11 (or boost) ?

If don't want to use lambda function, declare a local function and call it with QtConcurrent::BlockingMap ==> https://doc.qt.io/qt-5/qtconcurrentmap.html#concurrent-map

[SGaist]

Hi,

Note that if you use a version of Qt that is 5.7 or more recent, C++11 is mandatory to have so you can go on with lambdas.

[kamui]

Sadly it's for a version of the app still running on 5.5 ...

And I can't manage to make it work with something like this :

QtConcurrent::BlockingMap(fileinfolist, &MyClass::MyMemberFunction);

because myMemberFunction expects an arguement (other than this)

[KroMignon]

@kamui Have you tried?

QtConcurrent::BlockingMap(fileinfolist, this, &MyClass::MyMemberFunction);

[kamui]

Yes I tried it, because of the compiler message error :

QtConcurrent::BlockingMap(fileinfolist, &MyClass::MyMemberFunction);

QtConcurrent::BlockingMap(fileinfolist, this, &MyClass::MyMemberFunction);

As you can see, I can't have the good amount of arguments xD

[KroMignon]

@kamui I apologize, I wrote something stupid, this cannot work!

You have to define a function to be called with each of the element from the sequence:

void myMapFunction(const QFileInfo &fi)
{
  /// do stuff
}
...
QtConcurrent::blockingMap(fileinfolist, myMapFunction);

[kamui]

Thank you for the help but my question was "using member functions". I saw the documentation before asking

Nevermind In fact I manipulate a tree (QAbstractModelItem & co) inside and it appeared to be non thread-safe so ...