polymorphism..

[clodi]

Hello,
I am trying to create polymorphic classes but with no luck.
I have .h files and .cpp files.

I am declaring my classes in .h files and defining each function in .cpp files. I have a class called Sprite and a class called Animation that inherits from Sprite.

An Animation object is created inside an Entity object.
Entity.h:

 class Entity
{
private:
	//pointers

	//objects
	Sprite* look;
..
...

Then of course I specify what type of sprite it is in Entity.cpp:

void Entity::initialise( Graphics* pGraphics,  //Graphics address
	                     const char* pFile,    //File name address
						 int frameWidth,       //frame with
						 int frameHeight,      //frame height
						 int columns,          //columns
						 int frames,           //frames
						 int startFrame,       //startFrame
						 int currentFrame,     //currentFrame
						 int endFrame )        //endFrame
{
	look = new Animation();
	look->initialise( pGraphics,
		              pFile,
					  frameWidth,
					  frameHeight,
					  columns,
					  frames,
					  startFrame,
					  currentFrame,
					  endFrame );
}

Unfortunately that doesn't compile because it says that my initialise function contains too many arguments. Because Sprite::initialise takes only two arguments, I think the compiler is expecting that one initialise function even though my sprite::initialise function is declared as virtual in sprite.h

What is going wrong?
Should I also define the functions as virtual?
If so, where exactly do we put "virtual" in the definition?

Should I declare Animation::initialise as virtual as well?

Thanks a lot for the help,
Clodi

[LB]

We have no way to know whether lines 12 to 20 are allowed, we need to see definition of Animation class.

Also, avoid "initialize" and "free" functions - prefer to use constructors and destructors:
http://www.cplusplus.com/doc/tutorial/classes2/