Static Member Data - C++ Class

C++ examples for Class:static member

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Introduction

static member variables are shared among all instances of a class.

Demo Code

#include <iostream> 
 
class Robot // ww w .  jav  a  2 s . c  o  m
{ 
public: 
    Robot(int newAge = 1):age(newAge){ howManyRobots++; } 
    virtual ~Robot() { howManyRobots--; } 
    virtual int getAge() { return age; } 
    virtual void setAge(int newAge) { age = newAge; } 
    static int howManyRobots; 
 
private: 
    int age; 
}; 
 
int Robot::howManyRobots = 0; 
 
int main() 
{ 
    const int maxRobots = 5; 
    Robot *gestalt[maxRobots]; 
    int i; 
    for (i = 0; i < maxRobots; i++) 
           gestalt[i] = new Robot(i); 
 
    for (i = 0; i < maxRobots; i++) 
    { 
           std::cout << "There are "; 
           std::cout << Robot::howManyRobots; 
           std::cout << " robots left!\n"; 
           std::cout << "Deleting the one which is "; 
           std::cout << gestalt[i]->getAge(); 
           std::cout << " years old\n"; 
           delete gestalt[i]; 
           gestalt[i] = 0; 
    } 
    return 0; 
}

Result


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