c/NullObject_Exercise.h File Reference

Declaration of the NullObject_Exercise() function as used in the Null Object Pattern. More...

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Macros
#define	__NULLOBJECT_EXERCISE_H__

Functions
void	NullObject_Exercise (void)
	Example of using the Null Object Pattern.

Detailed Description

Declaration of the NullObject_Exercise() function as used in the Null Object Pattern.

Definition in file c/NullObject_Exercise.h.

Macro Definition Documentation

__NULLOBJECT_EXERCISE_H__

#define __NULLOBJECT_EXERCISE_H__

Definition at line 9 of file c/NullObject_Exercise.h.

Function Documentation

NullObject_Exercise()

void NullObject_Exercise

(

void

)

Example of using the Null Object Pattern.

The Null Object pattern is where an object or function acts as a stand-in for real commands but otherwise does nothing.

In this exercise, movement commands are presented as characters in a string, with the characters 'u', 'd', 'l', and 'r' representing the moves "up", "down", "left", and "right", respectively. To keep the processing of this string simple, all other characters in the string are assigned a Null Object ("Do Nothing") version of the move command.

This example displays the commands after parsing and then "executes" commands, which consists of printing the commands out.

This example highlights the Null Object Pattern while also utilizing the Command Pattern and Interpreter Pattern.

Definition at line 275 of file NullObject_Exercise.c.

References MoveProcessor_ExecuteMoveList(), and MoveProcessor_ShowMoveList().