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inheritance ?

Started by EvilCrap Dec 6, 2001 at 4:48 PM 0 replies 300+ views

Original Post

Dec 6, 2001 at 4:48 PM

say, how can i create a linked list of different classes? i think it has something to do with inheritance, but i dont recall. like, where each class has a common one, "a" class a; class b:a; class c:a; //this is psuedo code since i dont actually know how a* x = new (a)b; a* y = new (a)c; x->next = y; do ya get the drift of what i want to do?

invective

Dec 6, 2001 at 6:18 PM

You make the list a bunch of pointers to the base class.

  
#include <iostream>
#include <list>

class parent {
public:
	virtual void print ()
	{
		std::cout << "i am a parent";
	}
};

class child : public parent {
public:
	virtual void print ()
	{
		std::cout << "i am a child";
	}
};

void main (void)
{
	parent *parentPtr;
	child childObject;
	parentPtr=&childObject

	std::list <parent *> objectList;
	objectList.push_back (parentPtr);

	//Fetch first object from list

	parent * someObject = *( objectList.begin() );
	
	//this will call the child print function, because the function is

	//virtual (dynamically bound)

	someObject->print();
}

Brush up on your polymorphism / virtual functions here is you do not remember:
http://www.parashift.com/c++-faq-lite/virtual-functions.html

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