Hi, I'm compiling the boost::xpressive library under Visual Studio 9 at warning level 4. At the bottom of this email are the endless pages of warnings I'm getting. Note that I am using the latest version of xpressive from the boost trunk. 1>c:\it\personal\rocket_test\sdk\boost\boost\xpressive\detail\core\peeker.hpp(276) : warning C4512: 'boost::xpressive::detail::xpression_peeker<Char>' : assignment operator could not be generated 1> with 1> [ 1> Char=char 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\xpressive\detail\dynamic\matchable.hpp(67) : see reference to class template instantiation 'boost::xpressive::detail::xpression_peeker<Char>' being compiled 1> with 1> [ 1> Char=char 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\xpressive\detail\dynamic\matchable.hpp(66) : while compiling class template member function 'void boost::xpressive::detail::matchable_ex<BidiIter>::peek(boost::xpressive::detail::xpression_peeker<Char> &) const' 1> with 1> [ 1> BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>, 1> Char=char 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\intrusive_ptr.hpp(83) : see reference to class template instantiation 'boost::xpressive::detail::matchable_ex<BidiIter>' being compiled 1> with 1> [ 1> BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\intrusive_ptr.hpp(82) : while compiling class template member function 'boost::intrusive_ptr<T>::~intrusive_ptr(void)' 1> with 1> [ 1> T=const boost::xpressive::detail::matchable_ex<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\xpressive\detail\core\regex_impl.hpp(183) : see reference to class template instantiation 'boost::intrusive_ptr<T>' being compiled 1> with 1> [ 1> T=const boost::xpressive::detail::matchable_ex<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\type_traits\is_class.hpp(76) : see reference to class template instantiation 'boost::xpressive::detail::regex_impl<BidiIter>' being compiled 1> with 1> [ 1> BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\type_traits\is_class.hpp(121) : see reference to class template instantiation 'boost::detail::is_class_impl<T>' being compiled 1> with 1> [ 1> T=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\type_traits\is_base_and_derived.hpp(210) : see reference to class template instantiation 'boost::is_class<T>' being compiled 1> with 1> [ 1> T=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\type_traits\is_base_and_derived.hpp(225) : see reference to class template instantiation 'boost::detail::is_base_and_derived_impl<B,D>' being compiled 1> with 1> [ 1> B=boost::xpressive::detail::enable_reference_tracking<boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>>>, 1> D=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\mpl\assert.hpp(148) : see reference to class template instantiation 'boost::is_base_and_derived<Base,Derived>' being compiled 1> with 1> [ 1> Base=boost::xpressive::detail::enable_reference_tracking<boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>>>, 1> Derived=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\xpressive\detail\utility\tracking_ptr.hpp(381) : see reference to class template instantiation 'boost::mpl::assert_arg_pred_not<P>' being compiled 1> with 1> [ 1> P=boost::is_base_and_derived<boost::xpressive::detail::enable_reference_tracking<boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>>>,boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\xpressive\proto\expr.hpp(181) : see reference to class template instantiation 'boost::xpressive::detail::tracking_ptr<Type>' being compiled 1> with 1> [ 1> Type=boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\it\personal\rocket_test\sdk\boost\boost\xpressive\basic_regex.hpp(47) : see reference to class template instantiation 'boost::proto::exprns_::expr<Tag,Args>' being compiled 1> with 1> [ 1> Tag=boost::proto::tag::terminal, 1> Args=boost::proto::argsns_::args0<boost::xpressive::detail::tracking_ptr<boost::xpressive::detail::regex_impl<std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>>>>> 1> ] 1> c:\it\personal\rocket_test\source\rocketeventlisteners\mainmenu.cpp(63) : see reference to class template instantiation 'boost::xpressive::basic_regex<BidiIter>' being compiled 1> with 1> [ 1> BidiIter=std::_String_const_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ]