Re: [Boost-users] [serialization] conflicting declaration(BOOST_CLASS_EXPORT)

Subject: Re: [Boost-users] [serialization] conflicting declaration(BOOST_CLASS_EXPORT)
From: Jeff Flinn (TriumphSprint2000_at_[hidden])
Date: 2008-09-24 14:05:26

jens weller wrote:
> Jeff Flinn wrote:
>> jens weller wrote:
>>
>>> Robert Ramey wrote:
>>>
>>>> try the following re export:
>>>>
>>>> a) re-read the manual regarding boost class export
>>>
>>> I did, any points you think about?
>>>
>>>> b) Try using BOOST_CLASS_EXPORT only once.
>>>
>>>
>>> So far I thought after each class I could just set a 
>>> BOOST_CLASS_EXPORT($classname),
>>> as far as its derived from a serializable class.
>>> So, how to use it "only once"?
>>> Should I put those all in one file instead? ("exportmodel.hpp" f.e.)
>>
>>
>> Hi Jens,
>>
>> I think Robert means that BOOST_CLASS_EXPORT($classname) may only be 
>> expanded once in your program for a particular class name. And per the 
>> docs this expansion must occur within the context of all archive types 
>> that will be used to serialize the class.
>>
>> So rather than placing these macro calls in headers(which may be 
>> included in multiple translation units), place them in a cpp file that 
>> first includes the desired archive headers. Typically this would be in 
>> the class' implementation file. In the past I had placed them all in a 
>> single file, but quickly found the MSVC7.1 compiler limits, and had to 
>> break them up into export1.cpp, export2.cpp, ...
>>
>>
>> Jeff Flinn
> 
> Unfortunately it does not work for me.
> 
> "Die Anweisung "0x00411b4c" verweist auf Speicher in "0x000000000". Der 
> Vorgang "written" konnte nicht auf den Speicher durchgeführt werden."
> 
> thats what I get as soon as I compile in Releasemode.
> Debug Version runs without errors, so I guess the code is ok.
> 
> My Export.cpp:
> 
> 
> #include <boost/archive/text_oarchive.hpp>
> #include <boost/archive/text_iarchive.hpp>
> #include "Include.hpp"
> #include "FileNode.hpp"
> #include "DirNode.hpp"
> #include "Observer.hpp"
> 
> namespace codemodel
> {
> BOOST_CLASS_EXPORT( Include )
> BOOST_CLASS_EXPORT( FileNode )
> BOOST_CLASS_EXPORT( DirNode )
> BOOST_CLASS_EXPORT( ParentNode )
> //*/
> }
> 
> I'm using SVN Version of boost, about a week old.
> I currently have no short example, but will try to get one working.
> Anything wrong with this code?
> Any hints why it fails in Releasemode?

Could be the code is being stripped from the release build?

Sorry, meine deutsche rostig ist. :-) so I'm not positive of the 
compile/link error your getting.

Jeff