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→Include Terminology
=== Include Terminology ===
To referencing interfaces defined in other files, you must type #include "filename.idl".
In XPIDL, #include only includes the file once, so the #include statement does not need the ifdfs ifdefs which will be neede with
the C preprocessor.
=== Enumerations and Constants ===
C-style enumerations are not supported in XPIDL because the size of enums can be compiler specific. XPIDL alternatively supports defining constants that appear in the C++ and JavaScript mappings. They must be of type short or long and have to be present inside an interface declaration.