struct KeyInfo {
ed25519_pubkey:[ubyte:32];
x25519_pubkey:[ubyte:32];
}

table RegisterPublicKeyRequest {
requester_keyinfo:KeyInfo;
requester_nonce:[ubyte];
}

P2P::Protocol::RegisterPublicKeyRequestT req;
flatbuffers::span<uint8_t,32> s_pk(_sign_public_key,32);
flatbuffers::span<uint8_t,32> e_pk(_enc_public_key,32);
auto keyinfo = std::make_unique<P2P::Protocol::KeyInfo> (s_pk,e_pk);
req.requester_keyinfo = std::move(keyinfo);
req.requester_nonce = {3,3,2,1};

Is it OK to use std::move to set requester_keyinfo? I don't see a KeyInfoT class or struct for object API access to structs.

#4601

Or do I need to use --gen-mutable?

I actually don't need to write to the objects more than once, I just want to serialize in a different place and have easy access to the data up to the point of serializing, without having to pass the builder around to finish serializing.