...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::program_options::parse_config_file
template<typename charT> BOOST_PROGRAM_OPTIONS_DECL basic_parsed_options< charT > parse_config_file(std::basic_istream< charT > &, const options_description &, bool allow_unregistered = false);