Re: [netcdfgroup] NcFile as class member

• To: Jack Stalnaker <jack.stalnaker@xxxxxxxxx>
• Subject: Re: [netcdfgroup] NcFile as class member
• From: Russ Rew <russ@xxxxxxxxxxxxxxxx>
• Date: Wed, 19 Nov 2014 14:57:14 -0700

Hi Jack,

There are two different, non-compatible netCDF C++ releases, and I suspect
you may be trying to use the new netcdf-cxx4 library on code intended for
the legacy netcdf-cxx release.  You can still get, build, and install the
legacy release, but it is no longer being maintained or supported. See this
download site <http://www.unidata.ucar.edu/downloads/netcdf/> for either
version.

The newer netcdf-cxx4 software, contributed by Lynton Appel, is not
designed to be backward-compatible, but provides the benefits of a modern
C++ library with its use of name spaces, exceptions, and templates. The
legacy API used none of those, and it is impractical to upgrade in a
backward-compatible way to also provide support for the netCDF-4 enhanced
data model.

In case you want to upgrade to the netcdf-cxx4 library, the latest version
<https://github.com/Unidata/netcdf-cxx4> of the source has significant bug
fixes and other improvements over the current release available from the
legacy Downloads site referenced above.

--Russ

On Wed, Nov 19, 2014 at 12:17 PM, Jack Stalnaker <jack.stalnaker@xxxxxxxxx>
wrote:

> I'm sure this has been asked before, but I cannot find it in the archives.
> I cannot seem to use an NcFile object as a class member. If I do the
> following (shortened for clarity), I get a NcBadId exception:
>
> class Trync
> {
> public:
>     Trync()
>     {
>         fooFile = NcFile("foo.nc",NcFile::replace);
>         int a = 1;
>         fooFile.putAtt("bar", ncInt, size_t(1), &a);
>     }
>
>     NcFile fooFile;
> };
>
> int main()
> {
>     Trync tnc;
>     return 0;
> }
>
>
> To be clear, the exception happens even without the putAtt command. It
> just happens during the destruction of fooFile. I've looked at the
> definition of operator=() and it does seem to correctly copy myId from its
> rhs. Does anybody know what's going on, and is there a workaround?
>
> Thanks
>
> _______________________________________________
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> netcdfgroup@xxxxxxxxxxxxxxxx
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>

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