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

Nast	AST wrapper classes and functions
CChannel	Channel provides input/output of AST objects
CChebyDomain	The domain over which a Chebyshev polynomial is defined; returned by ChebyMap.getDomain
CChebyMap	A ChebyMap is a form of Mapping which performs a Chebyshev polynomial transformation
CCmpFrame	A CmpFrame is a compound Frame which allows two component Frames (of any class) to be merged together to form a more complex Frame
CCmpMap	Abstract base class for SeriesMap and ParallelMap
CDirectionPoint	Struct returned by Frame.offset2 containing a direction and a point
CFileStream	File-based source or sink (not both) for channels
CFitsChan	A specialized form of Channel which reads and writes FITS header cards
CFitsTable
CFoundValue	A value and associated validity flag
CFrameDict	A FrameSet whose frames can be referenced by domain name
CFrameMapping	Struct returned by Frame.pickAxes containing a frame and a mapping
CFrameSet	A FrameSet consists of a set of one or more Frames (which describe coordinate systems), connected together by Mappings (which describe how the coordinate systems are inter-related)
CKeyMap	KeyMap is used to store a set of values with associated keys which identify the values
CLutMap	LutMap is a specialised form of Mapping which transforms 1-dimensional coordinates by using linear interpolation in a lookup table
CMapBox	Object to compute the bounding box which just encloses another box after it has been transformed by a mapping
CMapping	An abstract base class for objects which transform one set of coordinates to another
CMapSplit	A Mapping split off as a subset of another Mapping
CMathMap	A MathMap is a Mapping which allows you to specify a set of forward and/or inverse transformation functions using arithmetic operations and mathematical functions similar to those available in C
CMatrixMap	MatrixMap is a form of Mapping which performs a general linear transformation
CNormMap	A Mapping which normalises coordinate values using the norm method of the supplied Frame
CNReadValue	Struct returned by Frame.unformat containing the number of characters read and corresponding value
CObject	Abstract base class for all AST objects
CParallelMap	A parallel compound mapping where the first Mapping is used to transform the lower numbered coordinates of each point and the second Mapping is used to transform the remaining coordinates
CPcdMap	A PcdMap is a non-linear Mapping which transforms 2-dimensional positions to correct for the radial distortion introduced by some cameras and telescopes
CPermMap	A Mapping which permutes the order of coordinates, and possibly also changes the number of coordinates, between its input and output
CPolyMap	PolyMap is a Mapping which performs a general polynomial transformation
CQuadApprox	A quadratic approximation to a 2D Mapping
CRateMap	RateMap is a Mapping which represents a single element of the Jacobian matrix of another Mapping
CResolvedPoint	Struct returned by Frame.resolve containing a point and the resolved vector components
CSeriesMap	A series compound mapping where the first Mapping is used to transform the coordinates of each point and the second Mapping is then applied to the result
CShiftMap	ShiftMap is a linear Mapping which shifts each axis by a specified constant value
CSkyFrame	SkyFrame is a specialised form of Frame which describes celestial longitude/latitude coordinate systems
CSlaMap	SlaMap is a specialised form of Mapping which can be used to represent a sequence of conversions between standard celestial (longitude, latitude) coordinate systems
CSpecFrame	A specialised form of one-dimensional Frame which represents various coordinate systems used to describe positions within an electro-magnetic spectrum
CSphMap	A SphMap is a Mapping which transforms points from a 3-dimensional Cartesian coordinate system into a 2-dimensional spherical coordinate system (longitude and latitude on a unit sphere centred at the origin)
CSplineMap	SplineMap is a Mapping which performs a 2-in, 2-out Mapping defined by a pair of two- dimensional B-spline surfaces
CStream	A stream for ast::Channel
CStringStream	String-based source and sink for channels
CTable
CTimeFrame	A TimeFrame is a specialised form of one-dimensional Frame which represents various coordinate systems used to describe positions in time
CTimeMap	A TimeMap is a specialised form of 1-dimensional Mapping which can be used to represent a sequence of conversions between standard time coordinate systems
CTranMap	TranMap is a Mapping which combines the forward transformation of a supplied Mapping with the inverse transformation of another supplied Mapping, ignoring the un-used transformation in each Mapping (indeed the un-used transformation need not exist)
CUnitMap	A UnitMap is a unit (null) Mapping that has no effect on the coordinates supplied to it
CUnitNormMap	The forward transformation of a UnitNormMap subtracts the specified centre and then transforms the resulting vector to a unit vector and the vector norm
CWcsMap	Map from a spherical system to a cartesian system using standard FITS sky coordinate projections
CWinMap	A WinMap is a linear Mapping which transforms a rectangular window in one coordinate system into a similar window in another coordinate system by scaling and shifting each axis (the window edges being parallel to the coordinate axes)
CXmlChan	XmlChan provides input/output of AST objects
CZoomMap	A Mapping which "zooms" a set of points about the origin by multiplying all coordinate values by the same scale factor
Nastshim
Ntest
CObjectTestCase
CMappingTestCase