[boost] command line parameters parser

Subject: [boost] command line parameters parser
From: Denis Shevchenko (shev.denis_at_[hidden])
Date: 2010-03-04 02:18:49

Hi! Sorry for my English, I am from Russia.

Is there any interest in a library which parse command line parameters 
and call correspond functions/functors?
Features:
- check type of parameter,
- check "value semantic" of parameter,
- set necessity of parameter,
- maybe set default value for parameter,
- some other settings.

Example:

void help() {
    std::cout << "This is my help info!" << std::endl;
    ::exit( 0 ); // Exit after printing help info.
}

struct config_file {
    void operator()( const std::string& file ) {
        // Some work with obtaining file path.
    }
};

void limit( const std::string& some_limit_value ) {
    // int limit = boost::lexical_cast< int >( some_limit_value );
    // ...
}

int main( int argc, char* argv[] ) {
    typedef command_line_parameter_parser  clp_parser;
    clp_parser parser;
    parser.add_parameter( "-h", "--help", help ); // Short and full 
names, in Unix tradition.
    // In this case we define parameter with one name and value (it is 
must be valid path);
    // Without check_value() obtaining path will not be checked.
    parser.add_parameter( "--config", config_file, 
clp_parser::with_value ).check_value( clp_parser::path );
    parser.add_parameter( "-l", "--limit", limit ).check_type( 
clp_parser::integer ); // Is integer?
    parser.set_value_separator( ':' );
    // "--config:/home/file.conf" instead default "--config=/home/file.conf"
    try {
        parser.parse( argc, argv );
    } catch ( const std::exception& exc ) {
        std::cerr << exc.what() << std::endl;
    }
    ...
    return 0;
}

Denis