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Can't override virtual methods in an adapter (#2450)

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This is just a consequence of casting to an adapter type doesn't change the data, including the vtable pointer.
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josh11b
2022-12-07 15:11:31 -08:00
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parent 30960d11a9
commit 9165b084f4
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@@ -1561,7 +1561,9 @@ This allows developers to provide implementations of new interfaces (as in
- You can add any declaration that you could add to a class except for
declarations that would change the representation of the type. This means
you can add methods, functions, interface implementations, and aliases, but
not fields, base classes, or virtual functions.
not fields, base classes, or virtual functions. The specific implementations
of virtual functions are part of the type representation, and so no virtual
functions may be overridden in an adapter either.
- The adapted type is compatible with the original type, and that relationship
is an equivalence class, so all of `Song`, `SongByTitle`, `FormattedSong`,
and `FormattedSongByTitle` end up compatible with each other.