[boost] Re: [program_options] post-review version

From: Neal D. Becker (ndbecker2_at_[hidden])
Date: 2004-03-19 08:35:54

Why not a default validator?
namespace po = boost::program_options;

namespace boost { namespace program_options {
  template<typename T>
  void validator<T>::operator()(any& v, const vector<string>& xs)
  {
    validators::check_first_occurence(v);
    string s(validators::get_single_string(xs));
    try {
      v = any(lexical_cast<T>(s));
    }
    catch(const bad_lexical_cast&) {
      throw validation_error("'" + s + "' doesn't look like a double
value.");
    }
  }
}}

This solves my immediate problem, which is that (strangely) program_options
has a validator for float but not for double.