Hello, I am currently trying to serialize the classes of a project I am working on, but I ran into a few compliation errors and I am kind of stuck, so I was hoping somebody here could help me on that. I am using the 1.43 version of the boost library and gcc 4.4.1. (I'd like to add that all the examples in and tutorials from the documentation work fine for me). I am trying to serialize a base class called "base" and it's derived class called "de" that use a shared pointer, and afterwards test my implementation by saving the an instance of a "de" object into a text archive and then restoring it. These is the serialization implementation for my two classes for reference: ---"base.h"----- #include<iostream> #include<string> #include<typeinfo> #include "../config.h" #include "../population.h" #include "../rng.h" #include<boost/shared_ptr.hpp> #include<boost/archive/text_iarchive.hpp> #include<boost/archive/text_oarchive.hpp> #include<boost/serialization/version.hpp> #include<boost/serialization/base_object.hpp> namespace pagmo { namespace algorithm { /// Base algorithm class. class base; /// Alias for shared pointer to base algorithm. typedef boost::shared_ptr<base> base_ptr; /// Base algorithm class. class __PAGMO_VISIBLE base { public: base(); /// Evolve method. virtual void evolve(population&p) const = 0; /// Clone method. virtual base_ptr clone() const = 0; virtual ~base(); std::string human_readable() const; virtual std::string get_name() const; virtual bool is_blocking() const; protected: virtual std::string human_readable_extra() const; protected: /// Random number generator for double-precision floating point values. mutable rng_double m_drng; /// Random number generator for unsigned integer values. mutable rng_uint32 m_urng; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive&ar, const unsigned int version){ std::cout<< "Serializing base algorithm"<< version<< std::endl; } }; }} //namespaces std::ostream __PAGMO_VISIBLE_FUNC&operator<<(std::ostream&, const base&); -------------------- --------"de.h"------ #include<string> #include "../config.h" #include "../population.h" #include "base.h" #include<boost/serialization/base_object.hpp> namespace pagmo { namespace algorithm { class __PAGMO_VISIBLE de: public base { public: de(int, const double& = 0.8, const double& = 0.9, int = 2); base_ptr clone() const; void evolve(population&) const; std::string get_name() const; protected: std::string human_readable_extra() const; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive&ar, const unsigned int version){ std::cout<< "Serializing de algorithm"<< version<< std::endl;; ar& boost::serialization::base_object<base>(*this); ar& m_gen; ar& m_f; ar& m_cr; ar& m_strategy; } const int m_gen; const double m_f; const double m_cr; const int m_strategy; }; }} //namespaces ------------------------------ Saving works fine (and as far as I can tell, based on the documentation examples the information is saved correctly in the text archive). This is the program that I am using to save and restore from archive: ----test_serialzazion.cpp----- #include<algorithm> #include<boost/typeof/typeof.hpp> #include<boost/utility/result_of.hpp> #include<cmath> #include<numeric> #include<string> #include<vector> #include "../src/pagmo.h" #include<cstdlib> #include<iostream> #include<fstream> #include<boost/archive/text_iarchive.hpp> #include<boost/archive/text_oarchive.hpp> using namespace pagmo; void save(const algorithm::de&alg, const char* filename) { std::ofstream ofs( filename ); boost::archive::text_oarchive oa( ofs ); oa<< alg; } void restore(algorithm::de& alg, const char* filename) { std::ifstream ifs( filename ); boost::archive::text_iarchive ia( ifs ); ia>> alg; } int main() { algorithm::de de = algorithm::de(500,.8,.8,2); std::cout<< "Testing algorithm:"<< de<< '\n'; std::string fileName = "test.txt"; save(de, fileName.c_str()); return 0; } ------------------ However, adding the restore function to restore the object back from the text archive results in the following compilation errors: In file included from /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:91, from /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:22, from /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:23, from /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:31, from /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:24, from /home/dante/pagmo/tests/../src/algorithm/base.h:36, from /home/dante/pagmo/tests/../src/algorithms.h:31, from /home/dante/pagmo/tests/../src/pagmo.h:30, from /home/dante/pagmo/tests/test_serialization.cpp:34: /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp: In function ‘void boost::archive::detail::check_const_loading() [with T = const int]’: /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:571: instantiated from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = const int]’ /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:68: instantiated from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:67: instantiated from ‘void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:71: instantiated from ‘void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:60: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:67: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator&(T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/tests/../src/algorithm/de.h:80: instantiated from ‘void pagmo::algorithm::de::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:182: 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::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/tests/test_serialization.cpp:89: instantiated from here /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp:162: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp:162: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp: In function ‘void boost::archive::detail::check_const_loading() [with T = const double]’: /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:571: instantiated from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = const double]’ /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:68: instantiated from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:67: instantiated from ‘void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:71: instantiated from ‘void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:60: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:67: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator&(T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/tests/../src/algorithm/de.h:81: instantiated from ‘void pagmo::algorithm::de::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:182: 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::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/tests/test_serialization.cpp:89: instantiated from here /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp:162: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp:162: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ In file included from /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:23, from /home/dante/pagmo/tests/../src/algorithm/base.h:36, from /home/dante/pagmo/tests/../src/algorithms.h:31, from /home/dante/pagmo/tests/../src/pagmo.h:30, from /home/dante/pagmo/tests/test_serialization.cpp:34: /home/dante/pagmo/external_headers/boost/archive/basic_text_iprimitive.hpp: In member function ‘void boost::archive::basic_text_iprimitive<IStream>::load(T&) [with T = const int, IStream = std::basic_istream<char, std::char_traits<char> >]’: /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:52: instantiated from ‘void boost::archive::text_iarchive_impl<Archive>::load(T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:107: instantiated from ‘static void boost::archive::load_access::load_primitive(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = const int]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:356: instantiated from ‘static void boost::archive::detail::load_non_pointer_type<Archive>::load_primitive::invoke(Archive&, T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:433: instantiated from ‘static void boost::archive::detail::load_non_pointer_type<Archive>::invoke(Archive&, T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:586: instantiated from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = const int]’ /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:68: instantiated from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:67: instantiated from ‘void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:71: instantiated from ‘void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:60: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:67: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator&(T&) [with T = const int, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/tests/../src/algorithm/de.h:80: instantiated from ‘void pagmo::algorithm::de::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:182: 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::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/tests/test_serialization.cpp:89: instantiated from here /home/dante/pagmo/external_headers/boost/archive/basic_text_iprimitive.hpp:88: error: ambiguous overload for ‘operator>>’ in ‘((boost::archive::basic_text_iprimitive<std::basic_istream<char, std::char_traits<char> > >*)this)->boost::archive::basic_text_iprimitive<std::basic_istream<char, std::char_traits<char> > >::is>> t’ /usr/include/c++/4.4/istream:119: note: candidates are: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]<near match> /usr/include/c++/4.4/istream:123: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>]<near match> /usr/include/c++/4.4/istream:130: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>]<near match> /usr/include/c++/4.4/istream:238: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>]<near match> /home/dante/pagmo/external_headers/boost/archive/basic_text_iprimitive.hpp: In member function ‘void boost::archive::basic_text_iprimitive<IStream>::load(T&) [with T = const double, IStream = std::basic_istream<char, std::char_traits<char> >]’: /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:52: instantiated from ‘void boost::archive::text_iarchive_impl<Archive>::load(T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:107: instantiated from ‘static void boost::archive::load_access::load_primitive(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = const double]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:356: instantiated from ‘static void boost::archive::detail::load_non_pointer_type<Archive>::load_primitive::invoke(Archive&, T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:433: instantiated from ‘static void boost::archive::detail::load_non_pointer_type<Archive>::invoke(Archive&, T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:586: instantiated from ‘void boost::archive::load(Archive&, T&) [with Archive = boost::archive::text_iarchive, T = const double]’ /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:68: instantiated from ‘void boost::archive::detail::common_iarchive<Archive>::load_override(T&, int) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:67: instantiated from ‘void boost::archive::basic_text_iarchive<Archive>::load_override(T&, int) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:71: instantiated from ‘void boost::archive::text_iarchive_impl<Archive>::load_override(T&, int) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:60: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator>>(T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:67: instantiated from ‘Archive& boost::archive::detail::interface_iarchive<Archive>::operator&(T&) [with T = const double, Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/tests/../src/algorithm/de.h:81: instantiated from ‘void pagmo::algorithm::de::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_iarchive]’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:182: 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::text_iarchive, T = pagmo::algorithm::de]’ /home/dante/pagmo/tests/test_serialization.cpp:89: instantiated from here /home/dante/pagmo/external_headers/boost/archive/basic_text_iprimitive.hpp:88: error: no match for ‘operator>>’ in ‘((boost::archive::basic_text_iprimitive<std::basic_istream<char, std::char_traits<char> > >*)this)->boost::archive::basic_text_iprimitive<std::basic_istream<char, std::char_traits<char> > >::is>> t’ /usr/include/c++/4.4/istream:119: note: candidates are: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_istream<_CharT, _Traits>& (*)(std::basic_istream<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:123: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_ios<_CharT, _Traits>& (*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:130: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::ios_base& (*)(std::ios_base&)) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:166: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:170: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:173: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:177: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:180: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:184: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:188: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:193: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:197: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:202: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:206: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:210: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:214: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char, _Traits = std::char_traits<char>] /usr/include/c++/4.4/istream:238: note: std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(std::basic_streambuf<_CharT, _Traits>*) [with _CharT = char, _Traits = std::char_traits<char>] Any Ideea of what I am doing wrong or what am I missing? Thank you and sorry for the trouble. Best regards, Dante Stroe