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

[detail level 1234]

▼Ngams
▼Ncontrol
▼Ndatabase
C_GamsSymbol	This is the representation of a symbol in GAMS
C_GamsSymbolRecord	This is the representation of a single record of a GamsSymbol
CGamsDatabase	An instance of GamsDatabase communicates data between the Python world and the GAMS world
CGamsDatabaseDomainViolation	This class describes a domain violation of a GamsDatabase
CGamsEquation	This is the representation of an equation symbol in GAMS
CGamsEquationRecord	This is the representation of a single record of a GamsEquation
CGamsParameter	This is the representation of a parameter symbol in GAMS
CGamsParameterRecord	This is the representation of a single record of a GamsParameter
CGamsSet	This is the representation of a set symbol in GAMS
CGamsSetRecord	This is the representation of a single record of a GamsSet
CGamsSymbolDomainViolation	This class describes a domain violation of a GamsSymbol
CGamsVariable	This is the representation of a variable symbol in GAMS
CGamsVariableRecord	This is the representation of a single record of a GamsVariable
▼Nexecution
CGamsCheckpoint	A GamsCheckpoint class captures the state of a GamsJob after the GamsJob.run method has been carried out
CGamsEngineConfiguration	Configuration that allows the execution of jobs on a specific GAMS Engine instance
CGamsJob	The GamsJob class manages the execution of a GAMS program given by GAMS model source
CGamsModelInstance
CGamsModelInstanceOpt	The GamsModelInstanceOpt can be used to customize the GamsModelInstance.solve() routine
CGamsModifier	Instances of this class are input to GamsModelInstance.instantiate()
CSymbolUpdateType	Symbol update type
CUpdateAction	What field to update
▼Noptions
CAction	GAMS processing request
CAppendExpand	Expand file append option
CAppendOut	Output file append option
CAsyncSolLst	Print solution listing when asynchronous solve (Grid or Threads) is used
CCaptureModelInstance	Switch to capture all model instances within a run
CCase	Output case option for LST file
CCharSet	Character set flag
CCheckErrorLevel	Check errorLevel automatically after executing external program
CDFormat	Date format
CDigit	Switch default for "$on/offDigit"
CDumpOpt	Writes preprocessed input to the file input.dmp
CDumpParms	GAMS parameter logging
CECImplicitLoad	Allow implicit loading of symbols from embedded code or not
CECLogLine	Show log line about embedded code initialization and execution or not
CEmpty	Switch default for "$on/offEmpty"
CErrMsg	Placing of compilation error messages
CExecMode	Limits on external programs that are allowed to be executed
CFDOpt	Options for finite differences
CFileCase	Casing of file names and paths (put, gdx, ref, $include, etc.)
CFiltered	Switch between filtered and domain-checked read from GDX
CForceWork	Force GAMS to process a save file created with a newer GAMS version or with execution errors
CFreeEmbeddedPython	Free external resources at the end of each embedded Python code blocks
CGamsOptions	The GamsOptions class manages GAMS options (sometimes also called GAMS parameters since they correspond to the command line parameters of the GAMS executable) for a GamsJob and GamsModelInstance
CgdxCompress	Compression of generated GDX file
CgdxConvert	Version of GDX files generated (for backward compatibility)
CgdxUels	Unload labels or UELs to GDX either squeezed or full
CHoldFixed	Treat fixed variables as constants
CHoldFixedAsync	Allow HoldFixed for models solved asynchronously as well
CImplicitAssign	Switch default for "$on/offImplicitAssign"
CInteractiveSolver	Allow solver to interact via command line input
CIntVarUp	Set mode for default upper bounds on integer variables
CKeep	Controls keeping or deletion of process directory and scratch files
CListing	Switch default for "$on/offListing"
CLogLine	Amount of line tracing to the log file
CLstTitleLeftAligned	Write title of LST file all left aligned
CMemoryManager	Allows to try an experimental memory manager
CMIIMode	Model Instance Mode
CNoNewVarEqu	Triggers a compilation error when new equations or variable symbols are introduced
COn115	Generate errors for unknown unique element in an equation
CPageContr	Output file page control option
CPrefixLoadPath	Prepend GAMS system directory to library load path
CPreviousWork	Indicator for writing workfile with previous workfile version
CProcTreeMemMonitor	Monitor the memory used by the GAMS process tree
CPutNR	Numeric round format for put files
CReferenceLineNo	Controls the line numbers written to a reference file
CReplace	Switch between merge and replace when reading from GDX into non-empty symbol
CSavePoint	Save solver point in GDX file
CShowOSMemory	Show the memory usage reported by the Operating System instead of the internal counting
CSolPrint	Solution report print option
CSolveLink	Solver link option
CSolveOpt	Multiple solve management
CStepSum	Summary of computing resources used by job steps
CstrictSingleton	Error if assignment to singleton set has multiple elements
CStringChk	String substitution options
CSuffixAlgebraVars	Switch default for "$on/offSuffixAlgebraVars"
CSuffixDLVars	Switch default for "$on/offSuffixDLVars"
CSuppress	Compiler listing option
CSys10	Changes rpower to ipower when the exponent is constant and within 1e-12 of an integer
CSys11	Dynamic resorting if indices in assignment/data statements are not in natural order
CSysOut	Solver Status file reporting option
CTFormat	Time format
CTraceOpt	Trace file format option
CZeroResRep	Report underflow as a warning when abs(results) LE ZeroRes and result set to zero
▼Nworkspace
CDebugLevel	GAMS Debug Level
CEquType	Equation subtype
CGamsException	Exception class thrown for GAMS exceptions
CGamsExceptionExecution	Exception class thrown for GAMS execution exceptions
CGamsExitCode	GAMS exit code
CGamsWorkspace	The GamsWorkspace is the base class of the gams.control API
CModelStat	Model Solution Status
CSetType	Set subtype
CSolveStat	Solver termination condition
CVarType	Variable subtype