pass multiple args to a pthread

main.cpp

#include <pthread.h>
#include <iostream>
class A
{
    public:
        A( int _i, int *_p ) : i( _i ), p( _p ){}
        int i;
        int *p;
        void squareMyPtr()
        {
            *p = (*p)*(*p);
        }
};

class B : public A
{
    public:
        B( int _i, int* _p, int _j ): A( _i, _p ), j(_j){}
        int j;
};

struct threadArgs
{
    threadArgs( A* a, B* b): a_ptr(a), b_ptr(b){}
    A* a_ptr;
    B* b_ptr;
};

void *threadMain( void* ta )
{
    threadArgs* args = static_cast<threadArgs*>( ta );
    std::cout << "args addr: " << args << std::endl;
    A* a = static_cast<A*>(args->a_ptr);
    B* b = static_cast<B*>(args->b_ptr);
    a->squareMyPtr();
    b->squareMyPtr();
    return NULL;
}

int main()
{
    int i = 10;
    A a(i, &i);
    a.squareMyPtr();
    std::cout << a.i << std::endl;
    std::cout << i << std::endl;
    std::cout << *(a.p) << std::endl;
    
    int d = 100;
    B b(i, &i, d);

    threadArgs ta( &a, &b);
    std::cout << "ta addr: "<< &ta << std::endl;
    pthread_t thread1;
    pthread_create(&thread1, NULL, *threadMain, (void*) &ta);
    pthread_join(thread1, NULL);
    std::cout << i << std::endl;
}