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Null Objects
[Patterns with a small 'p']

Collaboration diagram for Null Objects:

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Detailed Description

These objects implement various Interfaces in a way that does nothing. They exist so that we can use the Null Object Pattern see here, rather than allowing optionality via pointers that can be null we use references and use a 'null object' when we don't require the functionality. This simplifies the code as it removes the need to test for null and switch depending on a pointer's state; we always call the method and if the object is a null object the call just does nothing.

This section contains links to the code that implements this concept.

Classes
class	CNullEventSinkCallback
	An implementation of IEventSinkCallback that does nothing. More...
class	CNullCallbackTimerQueueMonitor
	An object that implements IMonitorCallbackTimerQueue and does nothing. More...
class	CNullMessageLog
	An object that implements ILogMessages and does nothing. More...
class	CNullThreadedCallbackTimerQueueMonitor
	An object that implements IMonitorCallbackTimerQueue and does nothing. More...
class	CNullThreadPoolMonitor
	An object that implements IMonitorThreadPool and does nothing. More...
class	CNullAsyncFileReaderMonitor
	An object that implements IMonitorAsyncFileReader and does nothing. More...
class	CNullAsyncFileWriterMonitor
	An object that implements IMonitorAsyncFileWriter and does nothing. More...
class	CNullBufferAllocationMonitor
	An object that implements IMonitorBufferAllocation and does nothing. More...
class	CStreamSocketConnectionManagerCallback
	An object that implements the CStreamSocketConnectionManager callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CStreamSocketConnectionManagerCallback
	An object that implements the CStreamSocketConnectionManager callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CDatagramSocketConnectionManagerCallback
	An object that implements the CDatagramSocketConnectionManager callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CDatagramSocketServerCallback
	An object that implements the CIDatagramSocketServer callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CNullDatagramSocketConnectionFilter
	A connection filter that does nothing. You can use this as a base class for your own filter if you don't need to override all of the filter functionality. More...
class	CNullSocketAllocationMonitor
	An object that implements IMonitorSocketAllocation and does nothing. More...
class	CNullStreamSocketConnectionFilter
	A connection filter that does nothing. You can use this as a base class for your own filter if you don't need to override all of the filter functionality. More...
class	CNullStreamSocketFlowControlMonitor
	A stream socket flow control monitor that does nothing. You can use this. More...
class	CStreamSocketConnectionManagerCallback
	An object that implements the CStreamSocketConnectionManager callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CStreamSocketServerCallback
	An object that implements the CStreamSocketServer callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CStreamSocketServerExCallback
	An object that implements the CStreamSocketServerEx callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CStreamSocketConnectionManagerCallback
	An object that implements the CStreamSocketConnectionManager callback interface and does nothing. You can derive from this class and override just the functions that you need to. More...
class	CNullEnvironmentBlockProvider
	An implementation of IProvideEnvironmentBlock that always returns a null block. More...
class	CNullJobMonitor
	An object that implements IMonitorThreadPool and does nothing. More...

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