Static Member Functions: its strictions

//A static member function does not have a this pointer. 

//cannot be a static and a non-static version of the same function. 

//A static member function may not be virtual. 

//static functions cannot be declared as const or volatile.

#include <iostream>
using namespace std;
class MyClass {
  static int resource;
public:
  static int getResource();
  void freeResource() { 
     resource = 0; 
  }
};
int MyClass::resource;   // define resource
int MyClass::getResource()
{
  if(resource) return 0; // resource already in use
  else {
    resource = 1;
    return 1;            // resource allocated to this object
  }
}
int main()
{
  MyClass myObject1, myObject2;

  if(MyClass::getResource()) 
     cout << "myObject1 has resource\n";
  if(!MyClass::getResource()) 
     cout << "myObject2 denied resource\n";
  myObject1.freeResource();
  
  if(myObject2.getResource()) 
    cout << "myObject2 can now use resource\n";
  return 0;
}

Related examples in the same category

1.	Static function and static variable
2.	Static function variable
3.	Static member functions: 'preinitialize' private static data
4.	A static member variable example.
5.	Use a static member variable independent of any object.
6.	Init static data before object creation
7.	A shared resource example.
8.	Usage and effect of a static data member

Static Member Functions: its strictions : Static « Language « C++

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