Re: [Boost-users] [Serialization, XML] - how to avoid another encoding level

From: Frank Bergemann (FBergemann_at_[hidden])
Date: 2007-03-22 15:23:38

Robert Ramey schrieb:
> What you want to do is to derive your own variation of xml_oarchive with
> special handling for this special type.  Actually I'm amazed you've
> got this far trying to match an external format without doing this.

me too :-)

> Look in the document under Case Studies/deriving from an archive
> and the example demo_fast_archive which shows how to do this.

- thanks for the hint, i'll check this.

Up to now i could at least get rid of the separate ToString() 
FromString() functions - temporary accepting the additional nesting level.

BTW:
Another way, which i tried to fix the originally reported problem, was 
to public derive from class boost::serialization::nvp and using a 
conversion constructor in the derived one for my data type:

// a sub-class to nvp, which has a conversion c'tor for my troublesome
// BoundedSequenceTmpl<CORBA::Short, TID, max>

   class MyNVP : public boost::serialization::nvp<std::string>
   {
    public:
     template <int TID, int max>
     MyNVP(const char *name,
           BoundedSequenceTmpl<CORBA::Short, TID, max> &p)
      {

       LOG_DEBUG("### enter conversion c'tor");
       // try to make it work _somehow_
       // - don't care about performance yet
       std::string stringified;
       std::ostringstream ostream;
       for (unsigned long i=0; i<p.length(); ++i) {
        ostream << p[i];
       }
       stringified = ostream.str();

       boost::serialization::nvp<std::string>(name, stringified);

      };

   } ;

I thought the idea is ok - but the compiler disagreed
- i couldn't create an instance of MyNVP(?!)

Best regards!

Frank

> Robert Ramey
> 
> 
> Frank Bergemann wrote:
>> using pInstance.imsi directly (which is a
>> BoundedSequenceTmpl<CORBA::Short>()) resulted in:
>>
>> <imsi> // dropped boost::serializations internal XML attributes here
>>  <hallo>SomeString</hallo>
>> </imsi>
>>
>> But I would like to have this one
>>
>> <imsi>SomeString</imsi>
>>
>> How can i do that?
>>
>> Thanks!
>>
>> Best regards!
>>
>> Frank
>>
>>
>>
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