Here are the classes, structs, unions and interfaces with brief descriptions:

Nlog4cpp	The top level namespace for all 'Log for C++' types and classes
Ndetails
Cbase_validator_data
Crequired_params_validator
Coptional_params_validator
Cparameter_validator
Nthreading
CMSMutex	A simple object wrapper around CreateMutex() and DeleteMutex()
CMSScopedLock	A simple object wrapper around WaitForSingleObject() and ReleaseMutex()
CMutex
CScopedLock	Definition of ScopedLock;
CThreadLocalDataHolder	This class holds Thread local data of type T, i.e
CAbortAppender	This Appender causes the application to abort() upon the first append() call
CAppender	Implement this interface for your own strategies for printing log statements
CAppenderMapStorage
CAppenderMapStorageInitializer
CAppendersFactory
CAppenderSkeleton	AppenderSkeleton is a helper class, simplifying implementation of Appenders: it already takes care of handling of Thresholds and Filters
CBasicConfigurator	This class implements a trivial default configuration for log4cpp: it adds a FileAppender that logs to stdout and uses a BasicLayout to the root Category
CBasicLayout	BasicLayout is a simple fixed format Layout implementation
CBufferingAppender
CCategory	This is the central class in the log4j package
CCategoryNameComponent
CCategoryStream	This class enables streaming simple types and objects to a category
CConfigureFailure	Exception class for configuration
CDailyRollingFileAppender	DailyRollingFileAppender is a FileAppender that rolls over the logfile once the next day starts
CFactoryParams
CFileAppender
CFilter	Users should extend this class to implement customized logging event filtering
CFixedContextCategory	This Category subclass replaces the NDC field in LoggingEvents with a fixed context string
CFormatModifierComponent
CHierarchyMaintainer	HierarchyMaintainer is an internal log4cpp class
CIdsaAppender	IdsaAppender is an Appender that sends LoggingEvents to the IDS/A logger and reference monitor by Marc Welz
CLayout	Extend this abstract class to create your own log layout format
CLayoutAppender	LayoutAppender is a common superclass for all Appenders that require a Layout
CLayoutsFactory
CLevelEvaluator
CLoggingEvent	The internal representation of logging events
CMessageComponent
CMillisSinceEpochComponent
CNDC	Implements nested diagnostic contexts as defined by Neil Harrison in the article "Patterns for Logging Diagnostic Messages" part of the book "<i>Pattern Languages of Program Design 3</i>" edited by Martin et al
CDiagnosticContext
CNDCComponent
CNTEventLogAppender	NTEventLogAppender is an Appender that sends LoggingEvents to the Windows event log
COstreamAppender	OstreamAppender appends LoggingEvents to ostreams
CPassThroughLayout
CPatternLayout	PatternLayout is a simple fixed format Layout implementation
CPatternComponent
CPriority	Importance levels with which one can categorize log messages
CPriorityComponent
CProcessorTimeComponent
CProperties
CPropertyConfigurator	Property configurator will read a config file using the same (or similar) format to the config file used by log4j
CPropertyConfiguratorImpl
CRemoteSyslogAppender	RemoteSyslogAppender sends LoggingEvents to a remote syslog system
CRollingFileAppender	RollingFileAppender is a FileAppender that rolls over the logfile once it has reached a certain size limit
CSecondsSinceEpochComponent
CSimpleConfigurator	This class implements a simple Configurator for log4cpp
CSimpleLayout	BasicLayout is a simple fixed format Layout implementation
CStringLiteralComponent
CStringQueueAppender	This class puts log messages in an in-memory queue
CStringUtil
CSyslogAppender	SyslogAppender sends LoggingEvents to the local syslog system
Ctab
CThreadNameComponent
CTimeStamp	A simple TimeStamp abstraction
CTimeStampComponent
CTriggeringEventEvaluator
CTriggeringEventEvaluatorFactory
Cwidth
CWin32DebugAppender	Win32DebugAppender simply sends the log message to the default system debugger on Win32 systems
Nstd
Costringstream