| c4_Bytes | Generic data buffer, with optional automatic clean up |
| c4_BytesProp | Binary properties |
| c4_BytesRef | Used to get or set binary object values |
| c4_Cursor | An iterator for collections of rows (views) |
| c4_CustomViewer | Abstract base class for definition of custom views |
| c4_DoubleProp | Double precision properties |
| c4_DoubleRef | Used to get or set double precision values |
| c4_FileStrategy | A file strategy encapsulates code dealing with all file I/O |
| c4_FileStream | A file stream can be used to serialize using the stdio library |
| c4_FloatProp | Floating point properties |
| c4_FloatRef | Used to get or set floating point values |
| c4_IntProp | Integer properties |
| c4_IntRef | Used to get or set integer values |
| c4_LongProp | Long int properties |
| c4_LongRef | Used to get or set long int values |
| c4_Property | Base class for the basic data types |
| c4_Reference | A reference is used to get or set typed data, using derived classes |
| c4_Row | An entry in a collection with copy semantics |
| c4_RowRef | Reference to a data row, can be used on either side of an assignment |
| c4_Sequence | A sequence is an abstract base class for views on ranges of records |
| c4_Storage | Manager for persistent storage of view structures |
| c4_Strategy | A strategy encapsulates code dealing with the I/O system interface |
| c4_Stream | A stream is a virtual helper class to serialize in binary form |
| c4_String | An efficient string class, modeled after the MFC version |
| c4_StringProp | String properties |
| c4_StringRef | Used to get or set string values |
| c4_View | A collection of data rows |
| c4_ViewProp | View properties |
| c4_ViewRef | Used to get or set view values |