Re: [Boost-users] [serialization] char[] and double

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-11-24 20:08:24

Larry Smith wrote:
>
>   ar & fld;  //  where fld is: char[200]
>
> What's the secret trick?

There a couple of ways.  On is to derive your archive from text_?archive
and add special handling for arrays.  Look at demo_fast_archive which
does this for arrays - (It uses binary_?archive as a base - but that's not
important here).

> The structs also contain many 'double' fields.
> If the precision is the (default?) 6 when serialized,
> that won't be enough.  Is there a way to control
> the precision of doubles when they are written to
> a text archive?

Hmmm - the precision saved in a text archive is determined by the
numeric traits on the machine creating the archive so I would hope
that the default precision would be the exact correct one.  Also it
might depend on the stream implementation.  I don't think  fact that a 
particular
value is rendered to 6 places means anything.  That is I would expect that
the value 2.0 is rendered as "2.0" rather than "2.000000000000000" .

I don't remember off hand where the precision is set.  I would expect its
easy to change in the stream after the archive is opened.

Robert Ramey

>
> Thanks,
> Larry