Initialize static member field outside the class declaration : static « Language Basics

Initialize static member field outside the class declaration : static « Language Basics « C++ Tutorial

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C++ Tutorial » Language Basics » static

1.12.3.Initialize static member field outside the class declaration

#include <iostream>

using std::cout;

using std::endl;



class Box {

  public:

    Box() {

      cout << "Default constructor called" << endl;

      ++objectCount;

      length = width = height = 1.0;

    }



    Box(double lvalue, double wvalue, double hvalue) :

                              length(lvalue), width(wvalue), height(hvalue) {

      cout << "Box constructor called" << endl;

      ++objectCount;

    }



    double volume() const {

      return length * width * height;

    }





    int getObjectCount() const {return objectCount;}



  private:

    static int objectCount;

    double length;

    double width;

    double height;

};

int Box::objectCount = 0;



int main() {

  cout << endl;



  Box firstBox(17.0, 11.0, 5.0);

  cout << "Object count is " << firstBox.getObjectCount() << endl;

  Box boxes[5];

  cout << "Object count is " << firstBox.getObjectCount() << endl;



  cout << "Volume of first box = "

       << firstBox.volume()

       << endl;



  const int count = sizeof boxes/sizeof boxes[0];



  cout <<"The boxes array has " << count << " elements."

       << endl;



  cout <<"Each element occupies " << sizeof boxes[0] << " bytes."

       << endl;



  for(int i = 0 ; i < count ; i++)

    cout << "Volume of boxes[" << i << "] = "

         << boxes[i].volume()

         << endl;



  return 0;

}

Box constructor called
Object count is 1
Default constructor called
Default constructor called
Default constructor called
Default constructor called
Default constructor called
Object count is 6
Volume of first box = 935
The boxes array has 5 elements.
Each element occupies 24 bytes.
Volume of boxes[0] = 1
Volume of boxes[1] = 1
Volume of boxes[2] = 1
Volume of boxes[3] = 1
Volume of boxes[4] = 1

1.12.static
	1.12.1.	Using a static long variable
	1.12.2.	Use static variable to compute a running average of numbers entered by the user
	1.12.3.	Initialize static member field outside the class declaration
	1.12.4.	A static local variable causes the compiler to create permanent storage for it in much the same way that it does for a global variable.

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