I have a "composite message", meaning Message C is composed of Message
A and Message B.

Message C
{
   required Message A = 1;
   required Message B = 2;
}

This composite message C I have serialized to disk ( say output.dat).

At a later stage in the code, the values of (say) Message A are
changed by the user. Is there a way of modifying only Message A and
updating the file on disk, without loading the composite Message C
updating the Message A and flushing entire contents to disk again?

Any help appreciated.

Thanks,
Linus

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