Automatically Adding New Class Instances to a Container - C++ Class

C++ examples for Class:object

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Description

Automatically Adding New Class Instances to a Container

Demo Code

                                                    
#include <iostream>
#include <list>
#include <algorithm>
                                                    
using namespace std;
                                                    
class MyClass {/* w  w  w.  j  av  a2 s  .  c  o m*/
protected:
   int value_;
public:
   static list<MyClass*> instances_;
   MyClass(int val);
  ~MyClass();
   static void showList();
};
                                                    
list<MyClass*> MyClass::instances_;
                                                    
MyClass::MyClass(int val) {
   instances_.push_back(this);
   value_ = val;
}
                                                    
MyClass::~MyClass() {
   list<MyClass*>::iterator p =
      find(instances_.begin(), instances_.end(), this);
   if (p != instances_.end())
      instances_.erase(p);
}
                                                    
void MyClass::showList() {
   for (list<MyClass*>::iterator p = instances_.begin();
        p != instances_.end(); ++p)
      cout << (*p)->value_ << endl;
}
                                                    
int main() {
   MyClass a(1);
   MyClass b(10);
   MyClass c(100);
   MyClass::showList();
}

Result


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