[boost] [program_options] nasty bug!

From: Neal D. Becker (ndbecker2_at_[hidden])
Date: 2004-03-26 15:27:45

There is a bug in program_options.  Now I remember, this is why I stopped
using it before.

It can't accept negative numbers as command line arguments!

#include <boost/program_options.hpp>
#include <iostream>
#include <cxxabi.h>             // demangle

using namespace std;
namespace po = boost::program_options;

int main (int argc, char** argv) {
  double angle;

  std::set_terminate(__gnu_cxx::__verbose_terminate_handler);

  po::options_description desc("Allowed options");
  desc.add_options()
    ("help", "produce help message")
    ("angle,a", po::value (&angle))
    ;

  po::variables_map vm;

  po::store(po::parse_command_line(argc, argv, desc), vm);

  po::notify(vm);

  if (vm.count("help")) {
    cout << desc << "\n";
    return 1;
  }

  cout << "angle: " << angle << '\n';
}

./Test1 -a -0.2
terminate called after throwing a
`boost::program_options::invalid_command_line_syntax'
  what(): required parameter is missing in '-a'
Aborted