Hi, I have code that compiles OK with Gcc 4.4 but fails with 4.5 and I cannot understand what the error I get from the compiler means. Maybe someone here can give me a suggestion? The error: In file included from /usr/include/boost/fusion/algorithm/query/find.hpp:13:0, from /usr/include/boost/fusion/sequence/intrinsic/has_key.hpp:12, from /usr/include/boost/fusion/sequence/intrinsic.hpp:16, from /usr/include/boost/fusion/sequence.hpp:12, from ../../../library/../include/Danu/DanuModelObjects/User.hpp:11, from ../../../library/../include/Danu/DanuViewObjects/UserViewObject.hpp:12, from ../../../library/../include/Danu/DanuViewObjects/UserDialog.hpp:15, from ../../../library/../include/Danu/DanuModelObjectsFactory/UserCreatorFunction.hpp:10, from ../../../library/DanuModelObjectsFactory/UserCreatorFunction.cpp:7: /usr/include/boost/fusion/iterator/key_of.hpp: In instantiation of 'boost::fusion::result_of::key_of >': /usr/include/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:85:88: instantiated from 'const int boost::mpl::aux::template_arity_impl >, Danu::UserCreator::objectId>, 1>::value' /usr/include/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:93:261: instantiated from 'const int boost::mpl::aux::template_arity >, Danu::UserCreator::objectId> >::value' /usr/include/boost/mpl/aux_/preprocessed/gcc/template_arity.hpp:98:30: instantiated from 'boost::mpl::aux::template_arity >, Danu::UserCreator::objectId> >' /usr/include/boost/fusion/algorithm/query/detail/find_if.hpp:184:9: instantiated from 'boost::fusion::detail::static_find_if, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair >::category, const Danu::UserCreator::UserCreationArguments, 0>, boost::fusion::basic_iterator, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair, boost::fusion::pair >::category, const Danu::UserCreator::UserCreationArguments, 7>, boost::is_same >, Danu::UserCreator::objectId> >' /usr/include/boost/fusion/algorithm/query/find.hpp:46:43: instantiated from 'boost::fusion::result_of::find' /usr/include/boost/fusion/sequence/intrinsic/at_key.hpp:37:17: instantiated from 'boost::fusion::extension::at_key_implboost::fusion::map_tag::apply' /usr/include/boost/fusion/sequence/intrinsic/at_key.hpp:70:9: instantiated from 'boost::fusion::result_of::at_key' ../../../library/DanuModelObjectsFactory/UserCreatorFunction.cpp:40:83: instantiated from here /usr/include/boost/fusion/iterator/key_of.hpp:38:9: error: invalid use of incomplete type 'struct boost::fusion::extension::key_of_implboost::fusion::non_fusion_tag' /usr/include/boost/fusion/iterator/key_of.hpp:20:16: error: declaration of 'struct boost::fusion::extension::key_of_implboost::fusion::non_fusion_tag' Snippets of relevant code (hopefully enough): - the first snipped is how I declare the boost::fusion::map - the second is how I use and where the error is (<--!!!!!!!!) ... namespace UserCreator { struct objectId; struct userId; struct userName; typedef boost::fusion::map < boost::fusion::pair< objectId, ObjectId >, boost::fusion::pair< userId, int >, boost::fusion::pair< userName, std::string >

UserArgs; struct UserCreationArguments : public MOCFunctionParameter, public UserArgs ...

... ModelObject* UserCreatorFunction::createObject( const MOCFunctionParameter* aMOCFunctionParameter /* = NULL */) const { ... if ( (arguments = dynamic_cast< UserCreator::UserCreationArguments* >(const_cast(aMOCFunctionParameter))) ) { ObjectId& objectId = boost::fusion::at_key< UserCreator::objectId >(*arguments); <--!!!!!!!! int& userId = boost::fusion::at_key< UserCreator::userId >(*arguments); std::string& userName = boost::fusion::at_key< UserCreator::userName >(*arguments); ... TIA -- Met vriendelijke groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl