itemis CREATE 'Default Domain' is a platform independent domain with a basic type system.
Choose this domain if you are new to itemis CREATE or you want to develop state machines independent from the concrete target language.
Depending on the code generator, these types will be mapped to language specific types. For C and C++, this is configurable via the generated sc_types.h. For exmaple, the type integer will be mapped to an int32_t.