...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::invalid_syntax
class invalid_syntax : public boost::program_options::error { public: // construct/copy/destruct invalid_syntax(const std::string &, const std::string &); ~invalid_syntax(); std::string tokens; std::string msg; };