pthread function from a class

Question

Let\'s say I have a class such as

class c { 
    // ...
    void *print(void *){ cout << \"Hello\"; }
}

And then I have a vector of c

Answer 1

This is a bit old question but a very common issue which many face. Following is a simple and elegant way to handle this by using std::thread

#include 
#include 
#include 
#include 

class foo
{
    public:
        void bar(int j)
        {
            n = j;
            for (int i = 0; i < 5; ++i) {
                std::cout << "Child thread executing\n";
                ++n;
                std::this_thread::sleep_for(std::chrono::milliseconds(10));
            }
        }
        int n = 0;
};

int main()
{
    int n = 5;
    foo f;
    std::thread class_thread(&foo::bar, &f, n); // t5 runs foo::bar() on object f
    std::this_thread::sleep_for(std::chrono::milliseconds(20));
    std::cout << "Main Thread running as usual";
    class_thread.join();
    std::cout << "Final value of foo::n is " << f.n << '\n';
}

Above code also takes care of passing argument to the thread function.

Refer std::thread document for more details.