Boost :: Spirit example simple grammar

Question

I am studying Boost Spirit (and Boost Fusion) tutorials (version 1.48.0). I played with an example of a toy employee. Link to the source is here:

http://www.boost.org/doc/libs/1_48_0/libs/spirit/example/qi/employee.cpp

Here is a grammar example:

employee_parser() : employee_parser::base_type(start)
    {
        using qi::int_;
        using qi::lit;
        using qi::double_;
        using qi::lexeme;
        using ascii::char_;

        quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];

        start %=
            lit("employee")
            >> '{'
            >>  int_ >> ','
            >>  quoted_string >> ','
            >>  quoted_string >> ','
            >>  double_
            >>  '}'
            ;
    }

    qi::rule<Iterator, std::string(), ascii::space_type> quoted_string;
    qi::rule<Iterator, employee(), ascii::space_type> start;

And my modifications eliminate the processing of quotes and simply analyze any character between the separator and assign it to the structure on which the parser is mapped.

        //quoted_string %= lexeme['"' >> +(char_ - '"') >> '"'];
        start %=
            lit("employee")
            >> '{'
            >>  int_ >> ','
            >>  +(char_) >> ','
            >>  +(char_) >> ','
            >>  double_
            >>  '}'
            ;

My assumption is that char_ includes all characters before reaching the comma. However, compiling and starting with the next line returns inoperability.

./employee
employee{10,my,name,20.0}
-------------------------
Parsing failed
-------------------------

, . , - , , , !

!

Answer 1

+(char_) char, >> ','. .

+(char_ - ','), -:

//...
>>  int_ >> ','     
>>  +(char_ - ',') >> ','     
>>  +(char_ - ',') >> ','     
>>  double_
//...

Parser +(char_ - ',') char, . >> ',', , +(char_ - ',') ..

: http://www.boost.org/doc/libs/1_48_0/libs/spirit/doc/html/spirit/qi/reference/operator/difference.html

, , , :

//...
>>  int_ >> ','     
>>  +(char_("a-zA-Z")) >> ','     
>>  +(char_("a-zA-Z")) >> ','     
>>  double_
//...