C++ Pointers Get Smart: Listing 1

Definition of my_class

#include <iostream>

using namespace std;

class my_class
{
private:
    // like in Java and C#, the following static member is
    // shared by all my_class instances
    static unsigned instance_counter_;
    // about this other, instead, each instance has its own
    // like in managed languages
    unsigned instance_id_;

public:
    // Constructor.
    my_class()
    {
        cout << "Instance " << (instance_id_ = ++instance_counter_) 
        << " being created." << endl;
    }

    // Destructor.
    ~my_class()
    {
        cout << "Instance " << instance_id_ << " being destroyed." << endl;
    }

    unsigned get_id() { return instance_id_; }
};

// class members are initialized outside the class declaration in C++
unsigned my_class::instance_counter_ = 0;

About the Author

Diego Dagum is a software architect and developer with more than 20 years of experience. He can be reached at email@diegodagum.com.