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Interfaces can be marshaled by value. For an interface marshaled by value (as opposed to a class instance derived from that interface), only the type ID of the most-derived interface is encoded. Here are the Slice definitions once more:

{zcode:slice}
interface Base { /* ... */ };

interface Derived extends Base { /* ... */ };

interface Example {
    void doSomething(Base b);
};
{zcode}

If the client passes a class instance to doSomething that does not have a Slice definition (but derives from Derived), the on-the-wire representation of the interface is as follows:

See Also

• Passing Interfaces by Value
• Type IDs
• Data Encoding for Classes