[Boost-users] Parsing and evaluate boolean expression

Hi All, I would like to parse and evaluate boolean expression such as (a=b and c>9). I am following this example at http://stackoverflow.com/questions/12598029/how-to-calculate-boolean-express.... This is the code for parsing steps: #include #include #include #include #include #include namespace qi = boost::spirit::qi; namespace phx = boost::phoenix; struct op_or {}; struct op_and {}; struct op_not {}; struct op_equal{}; struct op_not_equal{}; struct op_less{}; struct op_less_equal{}; struct op_greater{}; struct op_greater_equal{}; typedef std::string var; template <typename tag> struct binop; template <typename tag> struct unop; typedef boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > > expr; template <typename tag> struct binop { explicit binop(const expr& l, const expr& r) : oper1(l), oper2(r) { } expr oper1, oper2; }; template <typename tag> struct unop { explicit unop(const expr& o) : oper1(o) {} expr oper1; }; template struct parser : qi::grammar { parser() : parser::base_type(expr_) { using namespace qi; expr_ = boolExpr_.alias(); boolExpr_ = *((compExpr_ >> '|' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] |(compExpr_ >> '&' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] |(compExpr_ >> '!' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] ); compExpr_=((compExpr_ >> '=' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] |(compExpr_ >> "!=" >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] |(compExpr_ >> '<' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] | (compExpr_ >> '<=' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] | (compExpr_ >> '>' >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] | (compExpr_ >> ">=" >> compExpr_ ) [ _val = phx::construct >(_1, _2) ] |'(' >> boolExpr_>>')' | varExpr_ ); varExpr_=qi::lexeme[ +(alpha|digit) ]; BOOST_SPIRIT_DEBUG_NODE(expr_); BOOST_SPIRIT_DEBUG_NODE(boolExpr_); BOOST_SPIRIT_DEBUG_NODE(compExpr_); BOOST_SPIRIT_DEBUG_NODE(varExpr_); // BOOST_SPIRIT_DEBUG_NODE(simple); // BOOST_SPIRIT_DEBUG_NODE(var_); } private: qi::rule varExpr_; qi::rule boolExpr_, compExpr_, expr_; }; int main() { std::string inputs="a=b & c>9"; typedef std::string::const_iterator It; It iter=inputs.begin(),end=inputs.end(); parser<It> p; try { expr result; bool ok = qi::phrase_parse(iter,end,p,qi::space,result); if (!ok) std::cerr << "invalid input\n"; else { std::cout << "result:\t" << result << "\n"; // std::cout << "evaluated:\t" << evaluate(result) << "\n"; } } catch (const qi::expectation_failure<It>& e) { std::cerr << "expectation_failure at '" << std::string(e.first, e.last) << "'\n"; } if (iter!=end) std::cerr << "unparsed: '" << std::string(iter,end) << "'\n"; return 0; } Before the parser instantiation, the compilation is ok. This is error. Thank you for any suggestion: c:\boost\boost_1_53_0\boost\spirit\home\qi\nonterminal\rule.hpp:176: erreur : no matching function for call to 'assertion_failed(mpl_::failed************ (boost::spirit::qi::rule::define(boost::spirit::qi::rule&, const Expr&, mpl_::false_) [with Auto = mpl_::bool_<false>, Expr = boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite

, boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, 0l>, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, 0l> >, 2l>&>, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, std::basic_string<char>(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>, Iterator = __gnu_cxx::__normal_iterator, T1 = boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), T2 = boost::proto::exprns_::expr >, 0l>, T3 = boost::spirit::unused_type, T4 = boost::spirit::unused_type, boost::spirit::qi::rule = boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>, mpl_::false_ = mpl_::bool_<false>]::error_invalid_expression::************)(boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&, boost::proto::exprns_::expr, 0l> >, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, boost::phoenix::composite , boost::fusion::vector, boost::spirit::argument<1>, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> >, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_, boost::fusion::void_> > >&>, 0l> >, 2l>&>, 2l>&, const boost::proto::exprns_::expr, 0l>, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, boost::variant >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper >, boost::recursive_wrapper > >(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>&, boost::proto::exprns_::expr, 0l> >, 2l>&>, 2l>&, boost::spirit::qi::rule<__gnu_cxx::__normal_iterator, std::basic_string<char>(), boost::proto::exprns_::expr >, 0l>, boost::spirit::unused_type, boost::spirit::unused_type>&>, 2l>))'

c:\boost\boost_1_53_0\boost\variant\detail\variant_io.hpp:64: erreur : no match for 'operator<<' in '((const boost::detail::variant::printer

*)this)->boost::detail::variant::printer::out_ << operand'

c:\boost\boost_1_53_0\boost\variant\detail\variant_io.hpp:64: erreur : no match for 'operator<<' in '((const boost::detail::variant::printer

*)this)->boost::detail::variant::printer::out_ << operand'

c:\boost\boost_1_53_0\boost\variant\detail\variant_io.hpp:64: erreur : no match for 'operator<<' in '((const boost::detail::variant::printer

*)this)->boost::detail::variant::printer::out_ << operand'

c:\boost\boost_1_53_0\boost\variant\detail\variant_io.hpp:64: erreur : no match for 'operator<<' in '((const boost::detail::variant::printer

*)this)->boost::detail::variant::printer::out_ << operand'

Regards Olivier