Detailed description of the number of C ++ statistical objects

Source: Internet
Author: User

The C ++ programming language supports a variety of programming styles and meets the needs of developers to a great extent. Here we will introduce the implementation of the number of objects in C ++ statistics. I hope my friends can get some help.

Use auto_ptr to count the number of objects in C ++. Be sure to declare the constructor as private. The code for counting the number of objects in C ++ is as follows:

  1. class A{  
  2. private:  
  3. static int i;  
  4. A(){  
  5. }  
  6. A(const A&){}  
  7. public:  
  8. static void init(){  
  9. A::i=0;  
  10. }  
  11. auto_ptr<A> static makeA(){  
  12. i++;  
  13. auto_ptr<A> p(new A);  
  14. return p;  
  15. }  
  16. static int getNum(){  
  17. return A::i;  
  18. }  
  19. };  
  20. int A::i=0;  
  21. int main(){  
  22. for(int i=0;i<10;i++){  
  23. auto_ptr<A> p=A::makeA();  
  24. }  
  25. cout<<A::getNum()<<endl;  

The Operation Method for counting the number of objects in C ++ is described here.

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