QThread * create(Function &&f)
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Hello. I want to create a new thread using QThread * create(Function &&f). But I don't know how should transfer parameter. I don't quite understand this parameter-Function &&f. Here is my code.
class a { private: QThread* XferThread; void XferLoop(); } a::a { XferThread = QThread::create(XferLoop); }Parameter list mismatch. Does that have anything to do with member function(XferLoop)?How should I change my code？Thanks for any reply.
VS2015 + Qt5.12 on Windows10.Note: this function is only available when using C++17.
Does VS2015 support C++17?
If yes, did you enabled it withCONFIG+=c++17in the .pro file? -
Hi,
Based on the documentation of the create method, something like:
// somewhere: void myFunction(int arg1, int arg2) { qDebug() << Q_FUNC_INFO << arg1 << arg2; } // somewhere suitable: QThread *myThread = QThread::create(myFunction, 12, 30);@sgaist
Thanks for your reply.
The example you mentioned is correct. But in my code, XferLoop() is the member function of class a. So it shows the error-Parameter list mismatch. The function XferLoop() calls many private variables of class a.
QThread::create(Function &&f) dosen't need C++17, but the QThread::create(Function &&f, Args &&... args) does. -
@sgaist
Thanks for your reply.
The example you mentioned is correct. But in my code, XferLoop() is the member function of class a. So it shows the error-Parameter list mismatch. The function XferLoop() calls many private variables of class a.
QThread::create(Function &&f) dosen't need C++17, but the QThread::create(Function &&f, Args &&... args) does.@qt_crazyer said in QThread * create(Function &&f):
QThread::create(Function &&f) dosen't need C++17, but the QThread::create(Function &&f, Args &&... args) does.
Sorry my fault!
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You can also use a lambda which is preferred over std::bind:
a::a(): XferThread(QThread::create([this](){XferLoop();}) {}@AshkanV said in QThread * create(Function &&f):
which is preferred over std::bind
One of them catch-all phrases, eh? Says who, and why is it supposedly preferred?
Read and abide by the Qt Code of Conduct
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@AshkanV said in QThread * create(Function &&f):
which is preferred over std::bind
One of them catch-all phrases, eh? Says who, and why is it supposedly preferred?
Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
Visit the Qt Academy at https://academy.qt.io/catalog -
Okay, so I found out about the "who". Now if you can convince me that "it is preferred" is the same as "clang tidy says it's preferred" ...
I remember there was this one guy who said everything should beautobecause reasons. Recently there was this other guy (here) that didn't realize usingautobroke his code ... stuff happens, I guess ... -
@kshegunov said in QThread * create(Function &&f):
Now if you can convince me that "it is preferred" is the same as "clang tidy says it's preferred" ...
No, no need to convince you. :)
I prefer lambdas because I never understood std::bind() and I need to think about it every time I see such a call :)Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
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@kshegunov said in QThread * create(Function &&f):
Now if you can convince me that "it is preferred" is the same as "clang tidy says it's preferred" ...
No, no need to convince you. :)
I prefer lambdas because I never understood std::bind() and I need to think about it every time I see such a call :)@Christian-Ehrlicher said in QThread * create(Function &&f):
I prefer lambdas
Such reasoning I can live with, even without any justification. I just grumble at the catch-it-all-no-need-to-think-about-it sort of statement(s).
