Re: [Boost-users] [serialization] Backward compatibility problem with 1:73

25 Jun 2020

      I found a workaround myself.

Our own archive was derived from e.g. boost::archive::text_iarchive_impl.
If I add the following code to its constructor it works again:

    if(0 == (flags & boost::archive::archive_flags::no_header))
         init();

I found this code in the text_iarchive class, which is derived from
text_iarchive_impl, what looks strange to me.

Is this a bug or should I use another class to derive our own archives from?

Best regards

Kai
...
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Von: Boost-users  Im Auftrag von Kai
Benndorf via Boost-users
Gesendet: Mittwoch, 24. Juni 2020 15:10
An: boost-users@lists.boost.org
Cc: Kai Benndorf 
Betreff: [Boost-users] [serialization] Backward compatibility problem with
1:73
Hi all,
we are using boost serialization for writing and reading data and just
switched from boost 1:67 to boost 1:73.
We now cannot read back the data written with boost 1:67 or prior. We get
an
archive_exception::input_stream_error exception.
Examining the files shows the difference. The old files are starting with
22 serialization::archive 16
The new files are missing this data. Removing it from the files enabled
the
reading with boost 1:73.
But strangely, if trying a small example program (the gps example from the
documentation) also boost 1:73 produces this data:
22 serialization::archive 18
Any idea what has changed in between these versions and could cause this
problem? Thanks in advance for any hint.
Our application uses an own derived archive class. Maybe I have to changed
something there?
Best regards
Kai Benndorf
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