Re: [Boost-users] [serialization] Problem deriving fromtext_oarchive_impl

From: Robert Ramey (ramey_at_[hidden])
Date: 2006-03-16 02:00:43

This also failed to compile for me with VC 7.1.

However it did compile with gcc 3.3, borland 6.64 and comeau.

So its safe to say its a compiler problem. In your case you might
just make all the member public.

Robert Ramey

Robert S. Grimes wrote:
>> Argh!  Now if only I can remember the attachments!  They are the text
>> (broken) and binary (works) versions.  My broken text code in
>> question is presented, in part, below.  The compiler complains about
>> the second friend line.
>>
>> -- Code --
>> #include <iostream>
>> #include <ostream>
>> #include <boost/archive/archive_exception.hpp>
>> #include <boost/archive/text_oarchive.hpp>
>>
>> template<class Archive>
>> class rsg_text_oarchive_impl :
>>  // don't derive from text_oarchive !!!
>>  public boost::archive::text_oarchive_impl<Archive>
>> {
>>    typedef rsg_text_oarchive_impl derived_t;
>> #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
>> public:
>> #else
>>    friend class
>> boost::archive::basic_text_oarchive<rsg_text_oarchive_impl<Archive>
>>    >; friend class
>>    boost::archive::basic_text_oprimitive<std::ostream>; friend class
>> boost::archive::save_access; #endif
>> public:
>>    rsg_text_oarchive_impl(std::ostream & os, unsigned int flags = 0)
>>        : boost::archive::text_oarchive_impl<Archive>(
>>            os,
>>            flags | boost::archive::no_header // skip default header
>> checking
>>        )
>>    {
>>      // use our own header checking
>>      if (0 == (flags & boost::archive::no_header)){
>>          os << "<!-- RSG Text Archive -->" << std::endl;
>>          this->boost::archive::basic_text_oarchive<Archive>::init();
>>      }
>>    }
>> };
>> -- end Code - more follows here...
>>
>>
>>> -----Original Message-----
>>> Subject: [serialization] Problem deriving from text_oarchive_impl
>>>
>>>
>>> Hi,
>>>
>>> I'm starting to get the hang of this as I slog through, but it's
>>> still a bit rough!  I'm able to derive a new archive from
>>> binary_oarchive_impl, but for some reason, I can't do the same
>>> with text_oarchive_impl.  Specifically, I get the following error
>>> (from MS Visual C++ 8.0, using Boost 1.33.1):
>>>
>>> 1>..\rsg_text_oarchive.hpp(24) : error C2649:
>>> 'basic_text_oprimitive<class std::basic_ostream<char,struct
>>> std::char_traits<char> > >' : is not a 'class'
>>> 1>  ..\rsg_text_oarchive.hpp(40) : see reference to class
>>> template instantiation 'rsg_text_oarchive_impl<Archive>' being
>>> compiled
>>>
>>> The similar line in the binary archive works fine.  Attached are
>>> the two derived archives in question.  All I'm trying to do (at
>>> this point) is add a short header in the constructor; next, I'll
>>> want to add a footer in the destructor.
>>>
>>> Thanks!
>>> -Bob
>>
>
>
>
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