37 inline std::istream &operator>>(std::istream &stream, T &out) {
40     auto min = +std::numeric_limits<T>::min();
41     auto max = +std::numeric_limits<T>::max();
48         stream.setstate(std::ios_base::failbit);
58 inline std::istream &operator>>(std::istream &stream, int8_t &out) {
63 inline std::istream &operator>>(std::istream &stream, uint8_t &out) {
70 inline std::istream &operator>>(std::istream &stream, T &out) {
74     std::underlying_type_t<T> in;
81     if (tmp < *validRange.begin() || tmp > *std::prev(validRange.end())) {
83         stream.setstate(std::ios_base::failbit);
101             mArgs.emplace_back(std::string_view(argv[argi]));  in Args()
105     template <typename T = std::string>
106     std::optional<T> get() {  in get()
110     template <typename T = std::string>
111     std::optional<T> pop() {  in pop()
119     std::optional<T> get(bool erase) {  in get()
128         std::stringstream stream{std::string{mArgs.front()}};  in get()
129         stream >> std::setbase(0) >> retValue;  in get()
141     std::vector<std::string_view> mArgs;
147         std::string name;
148         std::vector<std::string> details;
150     using UsageDetails = std::vector<Usage>;
156         Status status = doArgsAndMain(std::move(args));  in main()
162             std::cerr << "The requested operation is unavailable." << std::endl;  in main()
169     virtual std::string getDescription() const = 0;
170     virtual std::string getUsageSummary() const = 0;
176         std::cerr << "Description:\n  " << getDescription() << std::endl;  in printUsage()
177         std::cerr << "Usage:\n  " << mName << " " << getUsageSummary() << std::endl;  in printUsage()
179         std::cerr << "Details:" << std::endl;  in printUsage()
182             entryNameWidth = std::max(entryNameWidth, entry.name.length());  in printUsage()
187                 std::cerr << "  " << std::left << std::setw(entryNameWidth + 8) << prefix << line  in printUsage()
188                           << std::endl;  in printUsage()
200         if ((status = doMain(std::move(args))) != OK) {  in doArgsAndMain()
207     std::string mName;
213     using CommandCreator = std::function<std::unique_ptr<Command>()>;
217     static CommandCreator Register(const std::string name) {  in Register()
218         Instance()->mCommands[name] = [] { return std::make_unique<U>(); };  in Register()
222     static std::unique_ptr<Command> Create(const std::string name) {  in Create()
231         std::vector<std::string> list;  in List()
235         std::sort(list.begin(), list.end());  in List()
246     std::map<const std::string, CommandCreator> mCommands;
255             std::cerr << "Invalid Command!" << std::endl;  in doArgs()
261     Status doMain(Args &&args) override { return mCommand->main(std::move(args)); }  in doMain()
264     std::unique_ptr<Command> mCommand;