A classic example for a program that can be written in C and not in C++ is creating a mutlithreaded program with POSIX Thread. The POSIX thread functions have been defined in such a way that it cannot be acessed as a member function of an object. If it is required to create a thread of a memeber function of an object in C++ the only way to resolve it is create a thread of a C function which in turn calls the member of function of the desired object.
E.g.
class xyz
{
private:
// all variables defined here
public:
void newthreadfunction(void Param);
};
xyz someobject; // creating a global object of class xyz
// the C function which will be created as a new thread which will access the memeber function of the object
void *NewThread(void *Parameter)
{
someobject.newthreadfunction((void)Parameter); //call of the function
}
void main()
{
pthread_t Thread;
int ThreadCreated;
ThreadCreated pthread_create(&Thread NewThread (void*)3);
}
