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

[detail level 12]

CADIOS2Writer	Base class for ADIOS2-based writers
CAdjacencyList< T >
CBoundingBoxTree< T >
CComm	A duplicate MPI communicator and manage lifetime of the communicator
CConstant< T >	Constant value which can be attached to a Form
CCoordinateElement< T >
CDirichletBC< T, U >
CDofMap	Degree-of-freedom map
CElementDofLayout
CExpression< T, U >	Represents a mathematical expression evaluated at a pre-defined set of points on the reference cell
▼Cfalse_type
Cdependent_false< T >
CFiniteElement< T >
CFiniteElement< T >	Model of a finite element
CForm< T, U >	A representation of finite element variational forms
CFunction< T, U >
CFunctionSpace< T >	This class represents a finite element function space defined by a mesh, a finite element, and a local-to-global map of the degrees-of-freedom
CGeometry< T >	Geometry stores the geometry imposed on a mesh
CHyperElasticProblem	Hyperelastic problem class
CIndexMap
Cintegral_data< T, U >	Represents integral data, containing the integral ID, the kernel, and a list of entities to integrate over
CKrylovSolver
CMatrixCSR< Scalar, Container, ColContainer, RowPtrContainer >	Distributed sparse matrix
CMesh< T >	A Mesh consists of a set of connected and numbered mesh topological entities, and geometry data
CMeshTags< T >	MeshTags associate values with mesh topology entities
CNewtonSolver
▼COperator
CMatrix
CPointOwnershipData< T >	Information on the ownership of points distributed across processes
CScatterer< Allocator >	A Scatterer supports the MPI scattering and gathering of data that is associated with a common::IndexMap
CSLEPcEigenSolver	This class provides an eigenvalue solver for PETSc matrices. It is a wrapper for the SLEPc eigenvalue solver
CSparsityPattern
CTable	This class provides storage and pretty-printing for tables
CTimeLogger	Timer logging
CTimeLogManager	Logger initialisation
CTimer
CTopology	Topology stores the topology of a mesh, consisting of mesh entities and connectivity (incidence relations for the mesh entities)
CVector
CVector< T, Container >
CVTKFile	Output of meshes and functions in VTK/ParaView format
CXDMFFile