[Boost-users] default value of program options

Subject: [Boost-users] default value of program options
From: Axel (axel.boost_at_[hidden])
Date: 2009-12-02 05:48:58

  Hi

I m using program options classes to handles command line arguments 
(Boost version 1.35, Debian lenny packages). I don't manage to get this 
code work :

boost::program_options::options_description cmd_line_options_("Command 
line options") ;
boost::program_options::variables_map current_options_ ;
int port_ = 0 ;

cmd_line_options_.add_options() ("port,p", 
boost::program_options::value<int>(&port_), "specify the destination 
port to use") ;

try
{
  boost::program_options::store(boost::program_options::command_line_parser(argc, argv).options(cmd_line_options_).run(), current_options_) ;
}
catch(po::error &e)
{
  cout << "Error when parsing command line arguments: " << e.what() << 
"\n" ;
}

cout << port_ << ":" << current_options_["port"].as<int>() << endl ;

When executing : ./foo --port=12345, the output is :
0:12345

The port_ variable value remains to be 0 when the current_options_ 
variable hold the right value (12345).

Could someone tell me what am I doing wrong ?
Thanks