This inheritance list is sorted roughly, but not completely, alphabetically:

[detail level 12]

API2::AbstractUserParams	The AbstractUserParams class
API2::UserParams	The API2_UserParams class
API2::AccountDetail
API2::BaseType	The BaseType class
API2::DerivedType< T >	The DerivedType class
API2::DerivedType< UNSIGNED_CHARACTER >
API2::DerivedType< UNSIGNED_INTEGER >
API2::DerivedType< UNSIGNED_LONG >
API2::DebugLog	The DebugLog class
exception
API2::DuplicateKeyException	The DuplicateKeyException struct
API2::MarketDataSubscriptionFailedException	The MarketDataSubscriptionFailedException struct
API2::UnknownTypeException	The UnknownTypeException struct
API2::COMMON::Instrument	Provides all the information about Market Instrument
API2::COMMON::InstrumentPosition	The InstrumentPosition struct Provides the basic information like Open Qty, OpenSide, Traded Quantity in Buy/Sell Side, Average traded Price in Buy/Sell Side, Booked and Mark-To-Market Profit and loss
API2::COMMON::KeyValue	The KeyValue struct
API2::COMMON::MarketDataWrapper	Will contain the Snapshot/TBT Market Data
API2::COMMON::MarketDepthWrapper	Will store Bid Ask Price at particular level
API2::COMMON::MktData	The MktData class, The wrapper class for getting Market Feed for both Snapshot and Tick-By-Tick
API2::COMMON::OhlcQuote	The OhlcQuote class
API2::OrderBook	The OrderBook struct
API2::OrderConfirmation	Exchange Order Confirmation Message data
API2::SGContext	The main class to be inherited for creating a new Strategy
API2::SharedUtilities	The SharedUtilities class
API2::SingleOrder	The SingleOrder class. This wrapper is used for sending Single Leg Orders. Usage: Create an object for This using API2::SGContext::createNewOrder
API2::SpreadOrder
API2::StrategyParameters	Basic Strategy Parameters, StrategyId and ClientId. Stratgy Parameters are provided by StrategyParameters::getInfo()
API2::SymbolStaticData	The API_SymbolStaticData struct
API2::COMMON::TradeTick	The TradeTick struct
API2::COMMON::UserParamsReader	The UserParamsReader class