Start thread with derived class's member function

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Similar to this question: Start thread with member function and this one: std::thread calling method of class

However I have the following:

#include <thread> #include <iostream> class myAbstractClass { public: virtual void myFunction() = 0;//abstract class } class myFirstClass : public myAbstractClass { public: void myFunction() { std::cout << "First class here";} } class mySecondClass : public myAbstractClass { public: void myFunction() { std::cout << "Second class here";} }

Then I have to call myFunction() from a different place in a new thread, but the following does not compile (and I can't think of anything else to try):

public void callMemberFunctionInThread(myAbstractClass& myInstance) { std::thread myThread (&myAbstractClass::myFunction, myInstance); //supposed to call myInstance.myFunction() on myThread }

"does not compile" isn't very specific. What error messages are you getting? — Andrew Henle
– Andrew Henle, Commented Apr 9, 2017 at 14:15
Intellisense doesn't complain, compilation starts and then it gives C2259 'myAbstractClass': cannot instantiate abstract class in file tuple located in C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.10.25017\include (line 199) — ProgrammingMachine5000
– ProgrammingMachine5000, Commented Apr 9, 2017 at 14:24
Please fix your program so that it is an minimal reproducible example first. Lots of trivial syntax error here. — kennytm
– kennytm, Commented Apr 9, 2017 at 14:25
The abstract class member function should be virtual if the derived classes are supposed to override it. Don't know if that works with std::thread anyway. — Bo Persson
– Bo Persson, Commented Apr 9, 2017 at 14:42

peppe · Accepted Answer · 2017-04-09 14:52:14Z

Pass std::ref(myInstance). Note that std::thread constructor will make a copy of the arguments passed to it (see here), and you can't copy a myAbstractClass.

(Then, all of this will still work because std::thread functionality is described in terms of std::invoke, which unwraps the std::reference_wrapper obtained by std::ref and calls the pointer to member function onto it. See here).

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