Re: [Boost-users] XML Serialization

Subject: Re: [Boost-users] XML Serialization
From: Christophe hugon (chugon_at_[hidden])
Date: 2013-11-04 04:45:12

Hi Gazoo

On 03/11/2013 10:22, Lasse Laursen wrote:
> Hey People,
>
> I'm having some issues using BOOST's serialization capabilities in 
> version 1.53. To be honest, the capability provided by boost seem to 
> involve a lot of macro usage here and there, and despite the fact that 
> I've read a number of tutorials, I still don't feel like I've got a 
> solid grasp on how it all works.
>
> Probably because I keep running into compilation problems that I can't 
> seem to figure out how to fix logically, I usually just end up trying 
> a number of different macro's that other people recommend until it 
> just works.
>
> Not ideal, I know, but... All my logical deduction usually leads me to 
> solutions that don't work as I keep expecting.
>
> Case in point, I want to serialize some data as XML. Essentially it's 
> just a struct with a few strings in it that is used as 'settings' data.
>
> I get the following error message during compilation in VS2012:
>
> Error    47    error C2664: 'boost::mpl::assertion_failed' : cannot 
> convert parameter 1 from 'boost::mpl::failed 
> ************boost::serialization::is_wrapper<T>::* ***********' to 
> 'boost::mpl::assert<false>::type' 
> d:\sdks\cinder\boost\boost\archive\basic_xml_iarchive.hpp    70
>
> I found out, it had to do with any XML serilization requiring an 
> additional 'name' to be added, pertaining to how XML works via the 
> 'BOOST_SERIALIZATION_NVP' macro. 
Yes, it provide a flag name for the xml structure

> I added that to all my strings - still nothing. Then I proceeded to 
> comment out everything, so my struct is now just an empty shell:

I do prefer to use the form
    ar &  boost::serialization::make_nvp 
("DoubleProperties",fDoubleProperties);
I don't think that the friend is not superfluous if it is fully public, 
but let's wait confirmation.
>
> struct AEMSettings {
>     // Superfluous since structs are fully public?
>     friend class boost::serialization::access;
>
>     AEMSettings() {
>     }
>
>     /***
>     * Serialize handles both input/output as the & operator doubles as 
> both << and >>
>     */
>     template<class Archive>
>     void serialize( Archive &ar, const unsigned version )
>     {
>         //ar & BOOST_SERIALIZATION_NVP( mSpeakersDeviceName );
>         //ar & BOOST_SERIALIZATION_NVP( mSpeakersDeviceDriverName );
>
>         //ar & BOOST_SERIALIZATION_NVP( mHeadphonesDeviceName );
>         //ar & BOOST_SERIALIZATION_NVP( mHeadphonesDeviceDriverName );
>
>         //ar & BOOST_SERIALIZATION_NVP( mMicrophoneDeviceName );
>         //ar & BOOST_SERIALIZATION_NVP( mMicrophoneDeviceDriverName );
>     }
>
>     //std::string mSpeakersDeviceName;
>     //std::string mSpeakersDeviceDriverName;
>
>     //std::string mHeadphonesDeviceName;
>     //std::string mHeadphonesDeviceDriverName;
>
>     //std::string mMicrophoneDeviceName;
>     //std::string mMicrophoneDeviceDriverName;
>
> };
>
> Can anyone tell me what I am missing here?
>
> Regards,
> Gazoo
>
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Ice