cpp multipleThread: detach non-class type error

I’m writing a program with mutiplethread using cpp , but I have a compiler-error like this: my code could be presented as follow:

    //A.hpp
    class ControleCam{
    public:
    ControleCam();
    ~ControleCam();
    };

    //A.cpp
    #include "A.hpp"
    ControleCam::ControleCam(){
    ...
    }
    ControleCam::~ControleCam(){
    ...
    }
    //B.cpp
    #include <A.hpp>
    int main(){
    std::thread turnCam(ControleCam());
    turnCam.detach();
    }

So anybody have a clue about where I did wrong and what can I do?

Answer

std::thread turnCam(ControleCam());

You’ve hit C++’s Most Vexing Parse. The above declaration doesn’t declare a turnCam as a std::thread object. Rather threadCam is declared as a function that returns a std::thread. Use an extra pair of parenthesis or use uniform brace initialization syntax.

std::thread turnCam{ControleCam()};

BTW, you will need to have an overloaded operator()(...) in your class for the above to work.