Re: ChannelArchiver build error

["D. Peter Siddons" <siddons@bnl.gov>]

Hi Kay,
  Thanks for the tip. I am using gcc4.0.2, which is the default version 
for the Ubuntu distribution I'm using. Unfortunately, I am pretty 
clueless with c++, so I messed around trying to do what you suggest, but 
only got deeper in the hole :( I guess I'll have to wait until someone 
who knows what they're doing tries to build it.
Thanks,
Pete.

Kay-Uwe Kasemir wrote:
> Hello Pete:
>
> > I just tried to build ChannelArchiver, and got the following:
> > ../DataFile.h:130: error: ?DataHeaderIterator? does not name a type
> For reasons too terrible to describe in detail here,
> there are two DataFile.h: One in LibIO and one in Storage.
> The headers from LibIO are no longer installed, i.e. not
> copied to extensions/include. One should make sure
> that none are left in extensions/include from a previous version
> of the archiver toolset.
>
> Having said that: I think you're at the make stage of compiling LibIO,
> and use the DataFile.h in LibIO, not one left in extensions/include,
> and now we're faced with a compiler issue.
> What's your compiler version?
>
> Datafile.h indeed uses the DataHeaderIterator which is
> defined later on inside the same file, because Datafile
> and DataHeaderIterator refer to each other.
>
> So far, that was OK by simply sometimes using 'class DataHeaderIterator'
> instead of only 'DataHeaderIterator', so that the compiler
> gets an idea of what will come.
> I think that's really only supposed to work for
> 'class DataHeaderIterator *' or 'class DataHeaderIterator &',
> so I can see why your compiler is more correct than the code,
> but anyway, so far it was compiling.
>
> You can add 'class DataHeaderIterator' wherever the compiler complains
> in your case.
> Or move the DataHeaderIterator class before the Datafile,
> which will cause the compiler to complain about an unknown 'Datafile',
> and then you keep changing 'Datafile' into 'class Datafile' until it's 
> happy.
>
> Let me know what you get to work.
> Thanks,
> -Kay