Need help with variation of "Employee" sample

[Michael-231]

My experience with parsing is miniscule. I created a small parser in
spirit 1.8 and was very happy with it. Now I am trying to expand it and
move to spirit2.

My goal is to create parser in spirit2 that will parse sql-like
commands.

These commands resemble sql select statement, so I thought I will create
a structure (commandselect in the code below) that will have command
title ("select") and various structures for parts of the select command.
My first command option is a "frequency" option which is an integer
followed by the resolution type, for example 10 F2 , or 1 F1. Frequency
types are predefined.

For testing I am trying to parse a string SELECT 15 F2

Below is my attempt to do the parser using Employee sample from the
documentation.
It does not compile. Headers for it are taken from Employee sample.

Your help will be greatly appreciated.


struct frequency {   // frequency portion of the command. Example: 30
F1 or 16 F2 or similar    
        int value;
        int resolution; // resolution is supplied as a string.
                                // After parsing this value should be
mapped value from one of allowed frequencies() entry
};

BOOST_FUSION_ADAPT_STRUCT (
        frequency,
        (int, value)
        (int, resolution)
)

struct commandselect { // command itself. Example:
SELECT 30 F1 or SELECT 16 F2
        std::string title;
        frequency datafrequency;
};

BOOST_FUSION_ADAPT_STRUCT(
                                                  commandselect,
                                                  (std::string, title)
                                                  (frequency,
datafrequency)
                                                  )

// this structure holds allowed string values for "frequency" input
struct frequencies_ : symbols<char, unsigned> {
        frequencies_()
        {
                add
                        ("F1"  , 10)
                        ("F2"  , 20);
        }
} frequencies;


template <typename Iterator>
struct command_parser : grammar<Iterator, commandselect(), space_type>
{
        command_parser() : command_parser::base_type(start)
        {
                ruleFrequency %= eps [_val = 0] >> int_ >> frequencies;

                start %= eps [_val = 0]
                        >>  lit("SELECT")
                        >>  ruleFrequency;
        }

        rule<Iterator, frequency(), space_type> ruleFrequency;
        rule<Iterator, commandselect(), space_type> start;
};


int _tmain(int argc, _TCHAR* argv[])
{
  typedef std::string::const_iterator iterator_type;
  typedef command_parser<iterator_type> select_parser;
  select_parser parser;
 
  return 0;
}


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