inheritance.cpp

/*
 * Inheritance.cpp
 *
 *  Created on: Feb 29, 2012
 *      Author: behnam
 */

class Base {
public:
  int m_nPublic; // can be accessed by anybody
private:
  int m_nPrivate; // can only be accessed by Base member functions (but not
                  // derived classes)
protected:
  int m_nProtected; // can be accessed by Base member functions, or derived
                    // classes.
};
// http://www.learncpp.com/cpp-tutorial/115-inheritance-and-access-specifiers/
// There are three different ways for classes to inherit from other classes:
// public, private, and protected. If you do not choose an inheritance type, C++
// defaults to private inheritance

/* Inherit from Base publicly
 Public inheritance is by far the most commonly used type of inheritance.
class Pub: public Base
{
};

// Inherit from Base privately
class Pri: private Base
{
};

// Inherit from Base protectedly
class Pro: protected Base
{
};

class Def: Base // Defaults to private inheritance
{
};
*/
class Derived : public Base {
public:
  Derived() {
    // Derived's access to Base members is not influenced by the type of
    // inheritance used, so the following is always true:

    m_nPublic = 1; // allowed: can access public base members from derived class
    // m_nPrivate = 2; // not allowed: can not access private base members from
    // derived class
    m_nProtected =
        3; // allowed: can access protected base members from derived class
  }
};

// you can't inherit from this class
class CBase final {};

int main() {
  Base cBase;
  cBase.m_nPublic = 1; // allowed: can access public members from outside class
  // cBase.m_nPrivate = 2; // not allowed: can not access private members from
  // outside class cBase.m_nProtected = 3; // not allowed: can not access
  // protected members from outside class
}