boost::program_options config file option with multiple tokens

Question

I can not seem to be able to read from config file multitoken options like I can from command line. What is the syntax for the config file?

This is how the option descri

Answer 1

During finding myself confronted with a similar problem, I took the code above from Rob's answer (from May 4th, 2011), but had to change a few things due to changes in the boost architecture and C++11. I only cite the parts that I changed (or would have changed). The rest that is not within the validate function stays the same. For conformity reasons, I added the necessary std:: prefixes.

namespace po = boost::program_options;

void validate(boost::any& v,
  const std::vector& values,
  coordinate*, int) {
  coordinate c;
  std::vector dvalues;
  for(const auto& val : values)  {
    std::stringstream ss(val);
    std::copy(std::istream_iterator(ss), std::istream_iterator(),
      std::back_inserter(dvalues));
    if(!ss.eof()) {
      throw po::invalid_option_value("Invalid coordinate specification");
    }
  }
  if(dvalues.size() != 2) {
    throw po::invalid_option_value("Invalid coordinate specification");
  }
  c.x = dvalues[0];
  c.y = dvalues[1];
  v = c;
}

The shift from po::validation_error to po::invalid_option_value was hinted in https://stackoverflow.com/a/12186109/4579106