To use a class in a C++ program, the relevant header files must be included. The naming convention followed is that the file name is the same as the name of the class declared in the header file. For example, the odb_FieldValue object is declared in the file odb_FieldValue.h. The file odb_API.h includes all the header files required to use the API. Other header files must be included to use some classes:
To access material objects you must include the file odb_MaterialTypes.h.
To access section objects you must include the file odb_SectionTypes.h.