Passing member functions to std::thread

Question

Possible Duplicate:
Start thread with member function

I have recently been playing around with the new std::thread library in c++11 and I came across a problem. When i try to pass a classes function into a new thread, it gives me an error (I dont have the exact error text right now since im away from home) I had a class like this

class A
{
    void FunctA();
    void FunctB();

    void run()
    {
        std::thread t(FunctA);
        std::thread r(FunctB);
    }
}

What am I doing wrong?

have u tried making FunctA/FunctB static? – AndersK Jun 15 '12 at 20:39 — AndersK, Jun 15 '12 at 20:39

score 38 · Accepted Answer · answered Jun 15 '12 at 20:36

38

class A
{
    void FunctA();
    void FunctB();

    void run()
    {
        std::thread t(&A::FunctA, this);
        std::thread r(&A::FunctB, this);
    }
};

Pointers to member functions are different from pointers to functions, syntax of calling them is different, as well, and requires instance of class. You can just pass pointer to instance as second argument of std::thread constructor.

answered Jun 15 '12 at 20:36

Griwes

8,805
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5

what if they had args? how would you pass them? – kdubs Jul 26 '15 at 21:10
1

@kdubs: ...as further arguments to the constructor call. Please do read the docs in the future. – Griwes Jul 27 '15 at 10:49
This code fails! even if you add the `public` keyword.. – towi_parallelism Feb 05 '16 at 16:56
1

I know this is old, but I've been looking for the solution to this. I've seen this answer posted in a few places now, and while this compiles it causes a segfault. Why is this? – Iron Attorney May 10 '16 at 16:18
@IronAttorney maybe you need to join or detach the thread. – Steve M Jun 18 '16 at 17:39

score 0 · Answer 2 · answered Jun 15 '12 at 20:34

0

I think, the problem is that you can't get pointer to member function in a way similar to functions. Here you will find more information about this.

Also, it would be much easier to answer, if you provided compipler error text.

answered Jun 15 '12 at 20:34

JustSomeGuy

3,677
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Passing member functions to std::thread

2 Answers2

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