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# Function wrap_finalizer_fn

> Wrap a C finalizer callback into a `Box<dyn FnOnce() -> Json + Send>` for use by the core runtime. The callback is invoked exactly once when the stream is exhausted. The returned C string is parsed as JSON and then freed.

Generated from `cargo doc --no-deps -p nemo-relay -p nemo-relay-adaptive -p nemo-relay-ffi`.

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Wrap a C finalizer callback into a `Box<dyn FnOnce() -> Json + Send>` for use by the core runtime. The callback is invoked exactly once when the stream is exhausted. The returned C string is parsed as JSON and then freed.

## Safety

The caller must ensure `cb` remains valid until the returned closure is invoked. The C callback must return a valid, heap-allocated JSON C string (or null, in which case `Json::Null` is returned).