2011/4/7 Vincent Agnus
thanks for our answer !
Your solution work, but it is not exactly I want. Indeed this expression return the typename of a tag (for example literal-char) instead its value ( "A" , "B" , .... ).
Does my first suggestion solve your first attempt? i.e. (ostream&)m_error << ... for example if my start rule is
start = qi::char_("a-z") > qi::char_("!");
and I parse the string "a#" then I expect that _4 contain "!" , phx::bind(&boost::spirit::info::tag, qi::_4) return "literal-char"
2 questions : a) I have a look in boost::spirit::info class is the boost::spirit::info::value member is containing the data I want ( ie "!")
True here, but it's a more subtle thing than I can explain... Not every case can you get a utf8_string form boost::spirit::info::value. For example, "... > qi::char_('a', 'z')" you can get the value as a utf8_string "a-z"; while "... > qi::char_("a-z")" you can only get a nil object from value. b) perhaps it exists an alternative like
phx::construct<>( phx::val("") << _4 )
I don't know what you mean here.