Class ExeName

unittests/catch.hpp:6076–6116

    };

    class ExeName : public ComposableParserImpl<ExeName> {
        std::shared_ptr<std::string> m_name;
        std::shared_ptr<BoundValueRefBase> m_ref;

        template<typename LambdaT>
        static auto makeRef(LambdaT const &lambda) -> std::shared_ptr<BoundValueRefBase> {
            return std::make_shared<BoundLambda<LambdaT>>( lambda) ;
        }

    public:
        ExeName() : m_name( std::make_shared<std::string>( "<executable>" ) ) {}

        explicit ExeName( std::string &ref ) : ExeName() {
            m_ref = std::make_shared<BoundValueRef<std::string>>( ref );
        }

        template<typename LambdaT>
        explicit ExeName( LambdaT const& lambda ) : ExeName() {
            m_ref = std::make_shared<BoundLambda<LambdaT>>( lambda );
        }

        // The exe name is not parsed out of the normal tokens, but is handled specially
        auto parse( std::string const&, TokenStream const &tokens ) const -> InternalParseResult override {
            return InternalParseResult::ok( ParseState( ParseResultType::NoMatch, tokens ) );
        }

        auto name() const -> std::string { return *m_name; }
        auto set( std::string const& newName ) -> ParserResult {

            auto lastSlash = newName.find_last_of( "\\/" );
            auto filename = ( lastSlash == std::string::npos )
                    ? newName
                    : newName.substr( lastSlash+1 );

            *m_name = filename;
            if( m_ref )
                return m_ref->setValue( filename );
            else
                return ParserResult::ok( ParseResultType::Matched );
        }
    };

    class Arg : public ParserRefImpl<Arg> {
    public: