com_declare.rs

com::declare!(

    // A COM interface
    [uuid(...)]
    pub interface IComInterface {
        fn foo(&self);
        fn bar(&self);
    }

    // A public COM class must have a [uuid]
    [uuid(...)]
    pub class PublicClass : IComInterface, bindings::IImportedInterface {
        fields: file_types
    }

    // An internal COM class doesn't need a [uuid]
    pub(crate) class PrivateClass : IComInterface {
        fields: file_types
    }

    impl PublicClass {
        // Used by IClassFactory::CreateInstance
        fn new() -> Result<PublicClass> {
            Self {...}
        }
    }

    // How would this work?
    impl IComInterface for PublicClass {
        fn foo(&self) {
        }

        fn bar(&self) {
        }
    }

);