Hi,

>From http://code.google.com/apis/protocolbuffers/docs/encoding.html
<quote>
when a message is serialized its known fields should be written
sequentially by field number, as in the provided C++, Java, and Python
serialization code
</quote>

Like the encoded wire format, is the above guaranteed for the C++
Serialization API (assuming no unknown fields)?

Background:
I'm designing a file format based on protobuf. I plan to have the
first field as a fixed size file type magic value and second field as
a fixed size checksum value, followed by other fields. While opening
such a file, I'd like to match the magic value and verify the
checksum, before parsing the whole file.

Regards,
Srivats

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