static field is shared among instances : static « Class « C++






  1. C++
  2. Class
  3. static

static field is shared among instances

  
#include <iostream>
using namespace std;
class SomeClass 
{
  public:
    SomeClass(int value) { count++; my_data = value; }; 
    SomeClass(int value, int static_value) 
  {
      count = static_value; my_data = value; 
  };
    ~SomeClass(void) { count--; };
    void show_values(void) { cout << my_data << ' ' << count << endl; };
  private:  
    static int count;
    int my_data;
};      

int SomeClass::count;

int main(void)
{
   SomeClass One(1, 999); 
   One.show_values();   
   
   SomeClass Two(2, 1000);
   Two.show_values();

   SomeClass Three(3);
   Three.show_values();
}








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