Explain Static member function, differences between a static member function and non-static member functions
Static member function:-
Like static member variables we can also have static member functions. A member function that is declared as static has the following properties.1) A static member function can have access to only other static members(functions or variable) declared
in the same class.
2) A static member function can be called using the class name a follows.
a. Class_name : : function_name ( )
3) A static member function also calls the class constructor explicitly.
The differences between a static member function and non-static member functions are as follows.
• A static member function can access only static member(data and member functions) data and functions outside the class. A non-static member function can access all of the above including the static data member.• A static member function can be called, even when a class is not instantiated, a non-static member function can be called only after instantiating the class as an object.
• A static member function cannot be declared virtual, whereas a non-static member functions can be declared as virtual
• A static member function cannot have access to the 'this' pointer of the class.
• A static or non static member function cannot have the same name.
#include<iostream.h>
#include<conio.h>
class test
{
int code;
static int count ;
public:
void setcode( )
{ code =++ count; }
void showcode ( )
{cout<<"object_number"<< code<<endl ; }
static void showcount ( ) // static member function.
{ cout <<" count" <<count<<" \n";
cout<<”code =”<<code //error , code is a non static member function.
}
};
int test :: count;
void main ( )
{
test t1,t2,t3;
t1. setcode ();
t2. setcode ();
test :: showcount ( );
t3. setcode ( );
test:: showcount ( );
t1. showcode ( );
t2. showcode ( );
t3. showcode ( );
}
Output: -
count : 2 count : 3
object number :1object number : 2 object number : 3