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

[detail level 12345]

Nsearx
Nanswerers
N_core
CAnswerer
CAnswererInfo
CAnswerStorage
CModuleAnswerer
Nrandom
CSXNGAnswerer
Nstatistics
CSXNGAnswerer
Nbotdetection
Nconfig
CConfig
CFALSE
CSchemaIssue
Ntrusted_proxies
CProxyFix
Ncache
CExpireCache
CExpireCacheCfg
CExpireCacheSQLite
CExpireCacheStats
Ndata
Ncurrencies
CCurrenciesDB
Ntracker_patterns
CTrackerPatternsDB
CFields
CLocalesType
CUserAgentType
CWikiDataUnitType
Nenginelib
Ntraits
CEngineTraits
CEngineTraitsEncoder
CEngineTraitsMap
CEngine
CEngineCache
Nengines	::1337x
Nmarginalia
CApiSearchResult
CApiSearchResults
Nmullvad_leta
CDataNodeQueryMetaDataIndices
CDataNodeResultIndices
Nwikidata
CWDAmountAttribute
CWDArticle
CWDAttribute
CWDDateAttribute
CWDGeoAttribute
CWDImageAttribute
CWDLabelAttribute
CWDURLAttribute
Nexceptions
CSearxEngineAccessDeniedException
CSearxEngineAPIException
CSearxEngineCaptchaException
CSearxEngineException
CSearxEngineResponseException
CSearxEngineTooManyRequestsException
CSearxEngineXPathException
CSearxException
CSearxParameterException
CSearxSettingsException
CSearxXPathSyntaxException
Nextended_types
CSXNG_Request
CSXNG_Response
Nfavicons
Ncache
CFaviconCache
CFaviconCacheConfig
CFaviconCacheMEM
CFaviconCacheNull
CFaviconCacheSQLite
CFaviconCacheStats
Nconfig
C_FaviconConfig
CFaviconConfig
Nproxy
CFaviconProxyConfig
Nflaskfix
CReverseProxyPathFix
Ninfopage
CInfoPage
CInfoPageSet
Nmetrics
Nerror_recorder
CErrorContext
Nmodels
CCounterStorage
CHistogram
CHistogramStorage
CVoidCounterStorage
CVoidHistogram
Nnetwork
Nclient
CAsyncHTTPTransportNoHttp
CAsyncProxyTransportFixed
Nnetwork
CNetwork
CRequest
Nopenmetrics
COpenMetricsFamily
Nplugins
N_core
CPlugin
CPluginCfg
CPluginInfo
CPluginStorage
Nahmia_filter
CSXNGPlugin
Ncalculator
CSXNGPlugin
Nhash_plugin
CSXNGPlugin
Nhostnames
CSXNGPlugin
Noa_doi_rewrite
CSXNGPlugin
Nself_info
CSXNGPlugin
Ntime_zone
CSXNGPlugin
Ntor_check
CSXNGPlugin
Ntracker_url_remover
CSXNGPlugin
Nunit_converter
CSXNGPlugin
Npreferences
CBooleanChoices
CBooleanSetting
CClientPref
CEnginesSetting
CEnumStringSetting
CMapSetting
CMultipleChoiceSetting
CPluginsSetting
CPreferences
CSearchLanguageSetting
CSetSetting
CSetting
CStringSetting
CValidationException
Nquery
CBangParser
CExternalBangParser
CFeelingLuckyParser
CLanguageParser
CQueryPartParser
CRawTextQuery
CTimeoutParser
Nresult_types
N_base
CLegacyResult
CMainResult
CResult
Nanswer
CAnswer
CAnswerSet
CBaseAnswer
CTranslations
CItem
CWeatherAnswer
CItem
Ncode
CCode
Nkeyvalue
CKeyValue
Npaper
CPaper
CEngineResults
CResultList
Ctypes
Nresults
CResultContainer
CTiming
CUnresponsiveEngine
Nsearch
Nchecker
Nbackground
CCheckerErr
CCheckerOk
CCheckerOther
CEngineErr
CEngineOk
Nimpl
CChecker
CCheckerTests
CResultContainerTests
CTestResults
Nmodels
CEngineRef
CSearchQuery
Nprocessors
Nabstract
CEngineProcessor
CRequestParams
CSuspendedStatus
Noffline
COfflineProcessor
Nonline
CHTTPParams
COnlineParams
COnlineProcessor
Nonline_currency
CCurrenciesParams
COnlineCurrenciesParams
COnlineCurrencyProcessor
Nonline_dictionary
CDictParams
COnlineDictionaryProcessor
COnlineDictParams
Nonline_url_search
COnlineUrlSearchParams
COnlineUrlSearchProcessor
CUrlParams
CProcessorMap
CSearch
CSearchWithPlugins
Nsettings_defaults
CSettingsBytesValue
CSettingsDirectoryValue
CSettingSublistValue
CSettingsValue
Nsqlitedb
CDBSession
CSQLiteAppl
CSQLiteProperties
Nutils
C_NotSetClass
CHTMLTextExtractor
Nweather
CCompass
CDateTime
CGeoLocation
CPressure
CRelativeHumidity
CTemperature
CWindSpeed
Nwebutils
CCSVWriter
CJSONEncoder
Nwikidata_units
CBeaufort