std::thread <unresolved overloaded function type> error

c++ multithreading c++11 std stdthread
CPS picture CPS · Dec 15, 2012 · Viewed 11.7k times · Source

I am trying to spawn a thread from within my class and the thread executes a particular method in my class. The code looks like this:

class ThreadClass{
    int myThread(int arg){
     // do something
    }

    void createThread(){
        thread t = thread(myThread,10);
    }

} ;

This code on compilation throws an error saying

std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = int (ThreadClass::*)(int), _Args = {int}]
no known conversion for argument 1 from ‘<unresolved overloaded function type>’ to ‘int (ThreadClass::*&&)(int)’

I am not sure what is the actual bug here. Can someone help me with this?

Thanks.

Answer

imreal picture imreal · Dec 15, 2012

The problem is that a member function can't be called without an object. Provide a pointer to this so that the current object is used:

thread t(&ThreadClass::myThread, this, 10);

You could use an instance of any ThreadClass object, but in your case, it seems this is the right thing to do.

NOTE: Remember you need a reference to the created thread so that you can do a join() later on.

Related questions

I want to kill a std::thread using its thread object?

Possible Duplicate: C++0x thread interruption I am trying to kill/stop a c++ std::thread by using its thread object. How can we do this?

Read More
Delete std::thread after calling join?

I have some code that dynamically allocates a new std::thread from the C++11 <thread> header, like this: std::thread *th = new thread( /* my args */); Some time later, I call join: th->join(); Since I dynamically allocated …

Read More
How to use std::async on a member function?

How can I operate std::async call on a member function? Example: class Person{ public: void sum(int i){ cout << i << endl; } }; int main(int argc, char **argv) { Person person; async(&Person::sum,&person,4); } …

Read More