An example of parameterized class:

    class Stack #( ItemType: type of any )
    {
	private:
	   buffer: ItemType[];
	   stack_size: int;
	   stack_top_index: int;
	public:
	   function push (new_item: ItemType)
	   {	if (stack_top_index < stack_size)
		   buffer[++stack_top_index]:=new_item;
	   }
	   function pop ():ItemType
	   {	if (stack_top_index >=0)
		   return buffer[stack_top_index--];
		return 0;
	   }
	   enter (size: int) 	// constructor
	   {    if (size<100) size:=100;
		buffer := new ItemType[size];
		stack_size := size;
		stack_top_index := -1;
	   };
    };

The Stack class is parameterized by a class parameter, ItemType, which can be a subclass of any, which is the root class. For how to use the parameterized class, see this example.

More examples:

• a function
• a class
• object instantiation
• using parameterized classes
• inheritance