The Node abstract base class for building any expression tree.

This class is responsible for defining the methods of the abstract Node class. The Node class is the foundation for the entire expression tree, and is able to evaluate itself (returning a Number pointer), print itself (to any output stream), and copy itself (return a pointer to a copy of itself). All operators, variables, etc. fall under this superclass heading.

Source:

node.hh:25

Author:

Jonathan Kitchens

Version:

v0.9

Entity	Type	Scope	Short Description
~Node	destructor	public	The virtual destructor must be described.
Node	constructor	public	automatically generated
Node	constructor	public	automatically generated
Copy	method	public	Creates a copy of the current Node This returns a pointer to a copy of the current node.
Evaluate	method	public	Evaluates the expression tree starting at the current node.
operator =	operator	public	automatically generated
Print	method	public	Prints the expression tree starting with the current node.

The virtual destructor must be described.

Source:

node.hh:33

Author:

Jonathan Kitchens

Version:

v0.9

Code:

public virtual ~ Node ( )

automatically generated

Source:

node.hh

Code:

public Node (

)

automatically generated

Source:

node.hh

Code:

public Node (

const Node & )

Creates a copy of the current Node

This returns a pointer to a copy of the current node.

The definition of a "copy" is left up to each individual node. For instance, global variables return a pointer to themselves as a "copy" because they should never be copied by value.

Source:

node.hh:73

Author:

Jonathan Kitchens

Version:

v0.9

Returns:

a Node pointer to a "copy" of the current node

Code:

public virtual Node * Copy (

) = 0

Evaluates the expression tree starting at the current node.

This function returns a Number pointer to the evaluated tree which has itself as its root.

Source:

node.hh:46

Author:

Jonathan Kitchens

Version:

v0.9

Returns:

a Number pointer to the evaluated expression tree having this node as its root.

Code:

public virtual Number * Evaluate (

) = 0

automatically generated

Source:

node.hh

Code:

public Node & operator = (

const Node & )

Prints the expression tree starting with the current node.

This displays the expression tree (starting with this node as the root) in a pretty, easy-to-read infix format.

Source:

node.hh:58

Author:

Jonathan Kitchens

Version:

v0.9

Param:

out	the stream to which the output will be sent

Code:

public virtual void Print (

ostream & out ) const = 0