Section: 16.0 Using User Defined Types

16.0 Using User Defined Types

User-defined types can be used to store N-dimensional arrays structs, variable length arrays, enumerations, and opaque data ojects of known size.

Datasets and attributes may be of user-defined type.
A user defined type must be defined before it is used to store data.
When defined, a user type is assigned a typeid (which may not be the same between different openings of the same file).
The typeid is then used when defining a variable or writing an attribute.
User defined types may be nested (in some ways), so that one may define a compound type, holding a variable length array of enumerations.