4.6 Building an Automation server application

4.6.5 Dispatch method argument and return value types

The argument types and return types for dispatch methods are limited to the following:

<integer>, <character>, <single-float>, <double-float>,
<boolean>, <PLARGE-INTEGER>, <ole-array>, <LPDISPATCH>, <class-factory>,
<machine-word>

This limitation is necessary to allow the types to be mapped between Dylan and the C representations of the Microsoft OLE/COM libraries.

If necessary, you can use pass-as to constrain the representation of result values.