passing_arg_to_parent_constructor.cpp

/*
 * PassingArgToParentConstructor.cpp
 *
 *  Created on: Feb 8, 2012
 *      Author: behnam
 * In C++, whenever an object of a class is created, its constructor is called.
 * But that's not all--its parent class constructor is called
 * so if we need to send some parameter to initial parent we have to use:
 *  child_contructor: parent_constructor
 *  Bar() : Foo( 10 )
 *
 * http://codewrangler.home.comcast.net/~codewrangler/tech_info/ctor_init.html
 * http://www.cprogramming.com/tutorial/initialization-lists-c++.html
 */

#include <iostream>
using namespace std;
class Foo {
public:
  Foo(int x) {
    std::cout << "Foo's constructor "
              << "called with " << x << std::endl;
  }
};

class Bar : public Foo {
public:
  Bar()
      : Foo(10) // construct the Foo part of Bar
  {
    std::cout << "Bar's constructor" << std::endl;
  }
};
// int PassingArgToParentConstructormain()
int main() { Bar stool; }