How to create a thread inside a class function?

Question

I am very new to C++.

I have a class, and I want to create a thread inside a class\'s function. And that thread(function) will call and access the class function and va

Answer 1

You can pass a static member function to a pthread, and an instance of an object as its argument. The idiom goes something like this:

class Parallel
{
private:
    pthread_t thread;

    static void * staticEntryPoint(void * c);
    void entryPoint();

public:
    void start();
};

void Parallel::start()
{
    pthread_create(&thread, NULL, Parallel::staticEntryPoint, this);
}

void * Parallel::staticEntryPoint(void * c)
{
    ((Parallel *) c)->entryPoint();
    return NULL;
}

void Parallel::entryPoint()
{
    // thread body
}

This is a pthread example. You can probably adapt it to use a std::thread without much difficulty.

Answer 2

#include <thread>
#include <string>
#include <iostream>

class Class
{
public:
    Class(const std::string& s) : m_data(s) { }
    ~Class() { m_thread.join(); }
    void runThread() { m_thread = std::thread(&Class::print, this); }

private:
    std::string m_data;
    std::thread m_thread;
    void print() const { std::cout << m_data << '\n'; }
};

int main()
{
    Class c("Hello, world!");
    c.runThread();
}