Using the + operator in boost::spirit: char cast error?

In boost::spirit, I am trying to use the +(...) syntax to match one or more strings, like here:

#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>

#include <iostream>
#include <string>

namespace client
{
  namespace qi = boost::spirit::qi;
  namespace ascii = boost::spirit::ascii;

  template <typename Iterator>
  bool parse(Iterator first, Iterator last)
  {
    using qi::char_;

    qi::rule< Iterator, std::string(), ascii::space_type > text;
    qi::rule< Iterator, std::string() > myword;

    text = '"' >> +( myword ) >> '"'; // ERROR!
    myword = +char_;  

    bool r = qi::phrase_parse(first, last, text, ascii::space);
    if (first != last)
      return false;
    return r;
  }
}

But I'm getting the following error:

foo.cpp:20:   instantiated from 'bool client::parse
boost/spirit/home/qi/detail/assign_to.hpp:109: error: \
  invalid static_cast from type \
  'const std::basic_string<char, std::char_traits<char>, 开发者_Go百科std::allocator<char> >' \
  to type 'char'

Does anyone know what I'm doing wrong?

---

Your code compiles just fine with Boost V1.47 (Spirit V2.5). In this version of Spirit the attribute handling has been completely rewritten which fixes this issue (and a lot of other issues).