| CBilinearIntegratorWrapper | A wrapper class for bilinear integrator |
| CCompositeNonlinearIntegrator | A class for composite nonlinear integrator |
| CConfig | Singleton class to manage configuration settings loaded from a YAML file |
| CconfigTest | Test suite for the Config class |
| CconfigTestPrivateAccessor | |
| CConstant | Structure to hold a constant's details |
| CConstants | Class to manage a collection of constants |
| CconstTest | Test suite for the const class |
| CDObject | A universal data container class |
| CDObjectTest | Test suite for the DObject class |
| CHeader | Structure to hold the header information of an OPAT file |
| CLockableDObject | Wrapper for DObject with thread-safe access |
| CLockableDObjectTest | Test suite for the LockableDObject class |
| CMeshIO | Class for handling mesh input/output operations |
| CmeshIOTest | |
| CMetadata | Represents metadata information for data objects in the dobj module |
| CMetadataTest | Test suite for the Metadata class |
| CNonlinearPowerIntegrator | A class for nonlinear power integrator |
| COpatIO | Class to manage the input/output operations for OPAT files |
| CopatIOTest | Test suite for the const class |
| COPATTable | Structure to hold the data of an OPAT table |
| CTableIndex | Structure to hold the index information of a table in an OPAT file |