# sealed

Close further inheritance or override

Last updated: 2026-09-09

Package: language | Status: generated-cpp-only

Tags: data, keyword, language, yeho

Prefer thing and ordinary functions for Kyber-ready programs. Use class and interface only while evaluating the explicit oracle route.

```yh
sealed
```


## Closed class declaration

Prefer thing and ordinary functions for Kyber-ready programs. Use class and interface only while evaluating the explicit oracle route.

Verification: type checked

```yh
sealed class Pilot
{
    text callsign
}
```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.word_sealed"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/word--sealed/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Class and interface dispatch is generated-C++ only in Yeho Core 2026.1.

Generic classes and interfaces are not admitted even though the parser reserves research syntax.

Source: yeho/docs/language/conformance-2026.1.json: class-and-interface-dispatch; parser_declarations.cpp

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