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7-Friend-Static-Member.cpp
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7-Friend-Static-Member.cpp
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/*
*Friend functions and classes
• Friend functions are global functions
• They can access member of a class upon their objects
• A class can be declared as friend on another class
• All the functions of friend class can access private and protected members of other class
*/
class your; // Definitation
class my
{
private:
int a;
protected:
int b;
public:
int c;
friend your; // Friend Function allow access of all members Upon "Objects"
};
class your
{
public:
my m;
void fun()
{
m.a = 10;
m.b = 10;
m.c = 10;
}
};
/*
* Static Members
• Static data members are members of a class
• Only one instance of static members is created and shared by all objects
• They can be accessed directly using class name
•Static members functions are functions of a class, they can be called using class name, without creating object of a class.
• They can access only static data members of a class, they cannot access non-static members of a class.
*/
#include <bits/stdc++.h>
using namespace std;
class Test
{
public:
int a;
static int count; // Static has to "Defined Outside" Class
Test()
{
a = 10;
count++;
}
static int getCount() // Static Function Can only access "Static Member"
{
return count;
}
};
int Test::count = 0;
int main()
{
Test t1, t2;
cout << Test::getCount() << endl; // Call Static Function using Scope resolution Upon Class
cout << t1.getCount() << endl; // Using Object
}