I thought I had this working once after I found I needed the NVP wrappers for XML archives. Now the problem is back. Below is a highly simplified version of the problem followed by the compiler error output. I can't make heads or tails of the error messages. Anyone have any ideas? Merrill Succ.h======================= #include "boost/serialization/nvp.hpp" #include "boost/test/test_tools.hpp" namespace MyNS { class Succ { friend class Succ_Test; private: size_t mInputIndex; bool mIsInbound; friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(mInputIndex); ar & BOOST_SERIALIZATION_NVP(mIsInbound); }//serialize() public: Succ() {} // needed by serialization Succ(size_t inputIndex, bool isInbound); virtual ~Succ(); size_t inputIndex() const; bool isInbound() const; };//Succ }//MyNS Succ.cc===================================== #include "Succ.h" namespace MyNS { Succ::Succ(size_t inputIndex, bool isInbound): mInputIndex(inputIndex), mIsInbound(isInbound) {} Succ::~Succ() {} size_t Succ::inputIndex() const { return mInputIndex; } bool Succ::isInbound() const { return mIsInbound; } }//MyNS Succ_Test.cc================================= #include <fstream> #include "Succ.h" #include "boost/archive/xml_iarchive.hpp" #include "boost/archive/xml_oarchive.hpp" #include "boost/test/test_tools.hpp" using namespace std; namespace MyNS { class Succ_Test { public: void run(); };//Succ_Test //============================================================================= void Succ_Test::run() { const char* archiveFile = "temp/Succ_archive.xml"; size_t inputIndex = 65; bool isInbound = true; Succ* testObj_out = new Succ(inputIndex, isInbound); { // save data to archive ofstream outStream(archiveFile); boost::archive::xml_oarchive outArchive(outStream); // write class instance to archive outArchive << testObj_out; } // archive and stream closed when destructors are called Succ* testObj_in = new Succ(); { // create and open an archive for input ifstream inStream(archiveFile); boost::archive::xml_iarchive inArchive(inStream); // read class state from archive inArchive >> testObj_in; } // archive and stream closed when destructors are called return; }//run() }//MyNS compile stderr====================================== E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/basic_xml_oarchive.hpp: In member function `void boost::archive::basic_xml_oarchive<Archive>::save_override(T&, int) [with T = MyNS::Succ*, Archive = boost::archive::xml_oarchive]': E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/detail/interface_oarchive.hpp:78: instantiated from `Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = MyNS::Succ*, Archive = boost::archive::xml_oarchive]' E:/Dev-Cpp/Workflow/test/src/Succ_Test.cc:48: instantiated from here E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/basic_xml_oarchive.hpp:86: error: incomplete type `boost::STATIC_ASSERTION_FAILURE< false>' used in nested name specifier E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/basic_xml_oarchive.hpp:86: error: size of array has non-integral type `<type error>' E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/basic_xml_iarchive.hpp: In member function `void boost::archive::basic_xml_iarchive<Archive>::load_override(T&, int) [with T = MyNS::Succ*, Archive = boost::archive::xml_iarchive]': E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/xml_iarchive.hpp:74: instantiated from `void boost::archive::xml_iarchive_impl<Archive>::load_override(T&, int) [with T = MyNS::Succ*, Archive = boost::archive::xml_iarchive]' E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/detail/interface_iarchive.hpp:76: instantiated from `Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = MyNS::Succ*, Archive = boost::archive::xml_iarchive]' E:/Dev-Cpp/Workflow/test/src/Succ_Test.cc:58: instantiated from here E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/basic_xml_iarchive.hpp:66: error: incomplete type `boost::STATIC_ASSERTION_FAILURE< false>' used in nested name specifier E:/Dev-Cpp/Workflow/boost-1_33_1/include/boost/archive/basic_xml_iarchive.hpp:66: error: size of array has non-integral type `<type error>' make: *** [test/obj/Succ_Test.o] Error 1 //===========================================