Re: [Boost-users] serialization: loading std::map replacesexistingmapdata objects

From: Robert Ramey (ramey_at_[hidden])
Date: 2005-12-14 15:31:00

Which version of boost are you using?  I believe this may have come up and 
been addressed in 1_33_1?

Robert Ramey

Peter Whaite wrote:
> Robert Ramey <ramey_at_[hidden]> wrote:
>
>> Oh then maybe you want:
>
>> void serialize(boost::archive::xml_iarchive & ar, std::map<my_class>
>> > & t, const
>> unsigned int version){
>>     // for each member in the map
>>          ar & *it;
>> }
>
> Ah, I was looking for that but missed it.  I'm having trouble
> compiling
> the load though as gcc doesnt like the map member's std::pair.first
> being
> const. I'm sure I'm doing something incorrect that's blindingly
> obvious,
> but I just can't see it.  The code and compiler messages are below.
>
> #include <map>
> #include <fstream>
> #include <boost/archive/xml_wiarchive.hpp>
> #include <boost/serialization/utility.hpp> // For std::pair
>
> typedef boost::archive::xml_wiarchive iarchive;
> typedef std::wifstream ifstream;
>
> struct Mark {};
> enum MarkId {low,median,high};
> typedef std::map<MarkId,Mark> MarkMap;
>
> void serialize(iarchive &ar, MarkMap & m, const unsigned int version)
> {
>    MarkMap::iterator it;
>    for (it = m.begin() ; it != m.end(); ++it) {
>        ar & boost::serialization::make_nvp("item", *it);
>    }
> }
>
> int main(int argc, char* argv[])
> {
>   ifstream ifs;
>   iarchive ar(ifs);
>   MarkMap marks;
>   ar >> boost::serialization::make_nvp("marks",marks);
> }
>
> gcc --version
> gcc (GCC) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)
>
> g++ -c tsrz.cpp -I/usr/local/include  -isystem
> /usr/local/include/boost-1_33 -isystem ./boost -g -Wall
>   -Wno-non-virtual-dtor -Wno-inline -ftemplate-depth-255
>   -finline-functions -MMD -MF.deps/tsrz.d
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:
> In function `void boost::archive::load(Archive&, T&) [with Archive =
> boost::archive::xml_wiarchive, T = const MarkId]':
> /usr/local/include/boost-1_33/boost/archive/basic_xml_iarchive.hpp:80:
> instantiated from `void
> boost::archive::basic_xml_iarchive<Archive>::load_override(const
> boost::serialization::nvp<T>&, int) [with T = const MarkId, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/archive/xml_wiarchive.hpp:78:
>   instantiated from `void
> boost::archive::xml_wiarchive_impl<Archive>::load_override(T&, int)
>   [with T = const boost::serialization::nvp<const MarkId>, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/archive/detail/interface_iarchive.hpp:84:
> instantiated from `Archive&
> boost::archive::detail::interface_iarchive<Archive>::operator>>(T&)
> [with T = const boost::serialization::nvp<const MarkId>, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/archive/detail/interface_iarchive.hpp:91:
> instantiated from `Archive&
> boost::archive::detail::interface_iarchive<Archive>::operator&(T&)
> [with T = const boost::serialization::nvp<const MarkId>, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/serialization/utility.hpp:43:
> instantiated from `void boost::serialization::serialize(Archive&,
> std::pair<F, S>&, unsigned int) [with Archive =
> boost::archive::xml_wiarchive, F = const MarkId, S = Mark]'
> /usr/local/include/boost-1_33/boost/serialization/serialization.hpp:140:
> instantiated from `void boost::serialization::serialize_adl(Archive&,
> T&, unsigned int) [with Archive = boost::archive::xml_wiarchive, T =
> std::pair<const MarkId, Mark>]'
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:158:
> instantiated from `void boost::archive::detail::iserializer<Archive,
> T>::load_object_data(boost::archive::detail::basic_iarchive&, void*,
> unsigned int) const [with Archive = boost::archive::xml_wiarchive, T
> = std::pair<const MarkId, Mark>]'
> /usr/local/include/boost-1_33/boost/mpl/if.hpp:67:   instantiated
> from here
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:544:
> `sizeof' applied to incomplete type
> `boost::STATIC_ASSERTION_FAILURE<false>'
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:
> In static member function `static void
> boost::archive::detail::load_enum_type<Archive,
>>>> invoke(Archive&, T&) [with Archive =
>>>> boost::archive::xml_wiarchive, T =
>   const MarkId]':
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:559:
> instantiated from `void boost::archive::load(Archive&, T&) [with
> Archive = boost::archive::xml_wiarchive, T = const MarkId]'
> /usr/local/include/boost-1_33/boost/archive/basic_xml_iarchive.hpp:80:
> instantiated from `void
> boost::archive::basic_xml_iarchive<Archive>::load_override(const
> boost::serialization::nvp<T>&, int) [with T = const MarkId, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/archive/xml_wiarchive.hpp:78:
> instantiated from `void
>    boost::archive::xml_wiarchive_impl<Archive>::load_override(T&,
> int) [with T = const boost::serialization::nvp<const MarkId>, Archive
> = boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/archive/detail/interface_iarchive.hpp:84:
> instantiated from `Archive&
> boost::archive::detail::interface_iarchive<Archive>::operator>>(T&)
> [with T = const boost::serialization::nvp<const MarkId>, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/archive/detail/interface_iarchive.hpp:91:
> instantiated from `Archive&
> boost::archive::detail::interface_iarchive<Archive>::operator&(T&)
> [with T = const boost::serialization::nvp<const MarkId>, Archive =
> boost::archive::xml_wiarchive]'
> /usr/local/include/boost-1_33/boost/serialization/utility.hpp:43:
> instantiated from `void boost::serialization::serialize(Archive&,
> std::pair<F, S>&, unsigned int) [with Archive =
> boost::archive::xml_wiarchive, F = const MarkId, S = Mark]'
> /usr/local/include/boost-1_33/boost/serialization/serialization.hpp:140:
> instantiated from `void boost::serialization::serialize_adl(Archive&,
> T&, unsigned int) [with Archive = boost::archive::xml_wiarchive, T =
> std::pair<const MarkId, Mark>]'
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:158:
> instantiated from `void boost::archive::detail::iserializer<Archive,
> T>::load_object_data(boost::archive::detail::basic_iarchive&, void*,
> unsigned int) const [with Archive = boost::archive::xml_wiarchive, T
> = std::pair<const MarkId, Mark>]'
> /usr/local/include/boost-1_33/boost/mpl/if.hpp:67:   instantiated
> from here
> /usr/local/include/boost-1_33/boost/archive/detail/iserializer.hpp:491:
> assignment of read-only reference `t'