Cannot pass class member-function to another function(std::thread::thread)

Question

Take a look at these 2 codes.

The code below works fine.

void someFunction () {

    // Some unimportant stuff
}

MainM::MainM(QObject *parent) :
    QObject(parent)
{

    std::thread oUpdate (someFunction);

}

This code throws an error:

void MainM::someFunction () {      //as a class member


}


MainM::MainM(QObject *parent) :
    QObject(parent)
{

    std::thread oUpdate (someFunction);

}

Error:

error: no matching function for call to 'std::thread::thread(<unresolved overloaded function type>)'
     std::thread oUpdate (someFunction);
                                     ^

possible duplicate of Start thread with member function - did you even try searching for an existing answer? — Jonathan Wakely
– Jonathan Wakely, Commented Sep 18, 2013 at 19:52
@JonathanWakely It is, sorry. It is not ONLY std::thread related, so... — khajvah
– khajvah, Commented Sep 18, 2013 at 20:08

sehe · Accepted Answer · 2013-09-18 19:36:16Z

8

You can't create a pointer-to-member-function by applying & to just the name. You need the fully qualified member: &MainM::someFunction.

And also bind it to an instance, by passing this, e.g.

#include <thread>

struct MainM
{
    void someFunction() {
    }

    void main() 
    {
        std::thread th(&MainM::someFunction, this);
    }
};

int main()
{
    MainM m;
    m.main();
}

answered Sep 18, 2013 at 19:36

sehe

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