Hi, I'm trying to use spirit2, first, I downloaded boost 1.35.0 release from https://svn.boost.org/svn/boost/branches/release Then I downloaded spirit2 from https://spirit.svn.sourceforge.net/svnroot/spirit/trunk/final Tried to use it. It gave me lots of errors, so I downloaded proto from https://svn.boost.org/svn/boost/branches/proto/v3 and replaced the boost/xpressive/proto directory. It worked, except that when compiling example 6 from the lexer, it chokes on a lot of places: template <typename Lexer> struct example6_tokens : lexer_def<Lexer> { typedef typename Lexer::token_set token_set; template <typename Self> void def (Self& self) { identifier = "[a-zA-Z_][a-zA-Z0-9_]*"; constant = "[0-9]+"; white_space = token_def<>("[ \\t\\n]+") | "\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\/" ; self = token_def<>('(') | ')' | '{' | '}' | '=' | ';'; // This chokes with conversion loses qualifiers self.add (constant, ID_CONSTANT) // This too ("if", ID_IF) ("else", ID_ELSE) ("while", ID_WHILE) (identifier, ID_IDENTIFIER) // This too ; self("WS") = white_space; // This chokes with other different errors. } token_def<std::string> identifier; token_def<unsigned int> constant; token_set white_space; }; They give these errors: D:\development\new_boost\last_svn_spirit2\boost/fusion/container/list/cons.hpp(82) : error C2440: 'initializing' : cannot convert from 'const boost::spirit::lex::terminal_holder<T,Terminal>' to 'boost::spirit::lex::terminal_holder<T,Terminal> &' with [ T=boost::spirit::lex::token_def<> *, Terminal=boost::spirit::lex::token_def<> ] Conversion loses qualifiers D:\development\new_boost\last_svn_spirit2\boost/type_traits/is_convertible.hpp(257) : see reference to function template instantiation 'boost::fusion::cons<Car,Cdr>::cons<T,boost::fusion::nil>(const boost::fusion::cons<T,Cdr> &)' being compiled with [ Car=boost::spirit::lex::terminal_holder<boost::spirit::lex::token_def<> *,boost::spirit::lex::token_def<>> &, Cdr=boost::fusion::nil, T=const boost::spirit::lex::terminal_holder<boost::spirit::lex::token_def<> *,boost::spirit::lex::token_def<>> ] D:\development\new_boost\last_svn_spirit2\boost/type_traits/is_convertible.hpp(289) : see reference to class template instantiation 'boost::detail::is_convertible_basic_impl<From,To>' being compiled with [ From=boost::fusion::cons<boost::spirit::lex::terminal_holder<boost::spirit::lex::token_def<> *,boost::spirit::lex::token_def<>>,boost::fusion::nil> &, To=boost::fusion::cons<boost::spirit::lex::terminal_holder<boost::spirit::lex::token_def<> *,boost::spirit::lex::token_def<>> &,boost::fusion::nil> ] D:\development\new_boost\last_svn_spirit2\boost/type_traits/is_convertible.hpp(366) : see reference to class template instantiation 'boost::detail::is_convertible_impl<From,To>' being compiled with [ From=boost::fusion::cons<boost::spirit::lex::terminal_holder<boost::spirit::lex::token_def<> *,boost::spirit::lex::token_def<>>,boost::fusion::nil>, To=boost::fusion::cons<boost::spirit::lex::terminal_holder<boost::spirit::lex::token_def<> *,boost::spirit::lex::token_def<>> &,boost::fusion::nil> ] And goes on. How should I proceed? Regards, -- Felipe Magno de Almeida