Add `deserializer()` in `serializer.tmpl` to have a single function
that generates all the necessary functions into the template specialization
like `serializer()`. This also avoids the duplication of some
conditional logic.
Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
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