Class Help

extlibs/catch/include/catch/catch.hpp:9158–9170

    };

    struct Help : Opt {
        Help( bool &showHelpFlag )
        :   Opt([&]( bool flag ) {
                showHelpFlag = flag;
                return ParserResult::ok( ParseResultType::ShortCircuitAll );
            })
        {
            static_cast<Opt &>( *this )
                    ("display usage information")
                    ["-?"]["-h"]["--help"]
                    .optional();
        }
    };

    struct Parser : ParserBase {