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 // Copyright (c) 2017-2025, University of Cincinnati, developed by Henry Schreiner
 // under NSF AWARD 1414736 and by the respective contributors.
 // All rights reserved.
 //
 // SPDX-License-Identifier: BSD-3-Clause
 
 #pragma once
 
 // IWYU pragma: private, include "CLI/CLI.hpp"
 
 // [CLI11:public_includes:set]
 #include <algorithm>
 #include <cstdint>
 #include <functional>
 #include <iostream>
 #include <iterator>
 #include <memory>
 #include <numeric>
 #include <set>
 #include <sstream>
 #include <string>
 #include <utility>
 #include <vector>
 // [CLI11:public_includes:end]
 
 // CLI Library includes
 #include "ConfigFwd.hpp"
 #include "Error.hpp"
 #include "FormatterFwd.hpp"
 #include "Macros.hpp"
 #include "Option.hpp"
 #include "Split.hpp"
 #include "StringTools.hpp"
 #include "TypeTools.hpp"
 
 namespace CLI {
 // [CLI11:app_hpp:verbatim]
 
 #ifndef CLI11_PARSE
 #define CLI11_PARSE(app, ...)                                                                                          \
     try {                                                                                                              \
         (app).parse(__VA_ARGS__);                                                                                      \
     } catch(const CLI::ParseError &e) {                                                                                \
         return (app).exit(e);                                                                                          \
     }
 #endif
 
 namespace detail {
 enum class Classifier : std::uint8_t {
     NONE,
     POSITIONAL_MARK,
     SHORT,
     LONG,
     WINDOWS_STYLE,
     SUBCOMMAND,
     SUBCOMMAND_TERMINATOR
 };
 struct AppFriend;
 }  // namespace detail
 
 namespace FailureMessage {
 /// Printout a clean, simple message on error (the default in CLI11 1.5+)
 CLI11_INLINE std::string simple(const App *app, const Error &e);
 
 /// Printout the full help string on error (if this fn is set, the old default for CLI11)
 CLI11_INLINE std::string help(const App *app, const Error &e);
 }  // namespace FailureMessage
 
 /// enumeration of modes of how to deal with extras in config files
 
 enum class config_extras_mode : std::uint8_t { error = 0, ignore, ignore_all, capture };
 
 class App;
 
 using App_p = std::shared_ptr<App>;
 
 namespace detail {
 /// helper functions for adding in appropriate flag modifiers for add_flag
 
 template <typename T, enable_if_t<!std::is_integral<T>::value || (sizeof(T) <= 1U), detail::enabler> = detail::dummy>
 Option *default_flag_modifiers(Option *opt) {
     return opt->always_capture_default();
 }
 
 /// summing modifiers
 template <typename T, enable_if_t<std::is_integral<T>::value && (sizeof(T) > 1U), detail::enabler> = detail::dummy>
 Option *default_flag_modifiers(Option *opt) {
     return opt->multi_option_policy(MultiOptionPolicy::Sum)->default_str("0")->force_callback();
 }
 
 }  // namespace detail
 
 class Option_group;
 /// Creates a command line program, with very few defaults.
 /** To use, create a new `Program()` instance with `argc`, `argv`, and a help description. The templated
  *  add_option methods make it easy to prepare options. Remember to call `.start` before starting your
  * program, so that the options can be evaluated and the help option doesn't accidentally run your program. */
 class App {
     friend Option;
     friend detail::AppFriend;
 
   protected:
     // This library follows the Google style guide for member names ending in underscores
 
     /// @name Basics
     ///@{
 
     /// Subcommand name or program name (from parser if name is empty)
     std::string name_{};
 
     /// Description of the current program/subcommand
     std::string description_{};
 
     /// If true, allow extra arguments (ie, don't throw an error). INHERITABLE
     bool allow_extras_{false};
 
     /// If ignore, allow extra arguments in the ini file (ie, don't throw an error). INHERITABLE
     /// if error, error on an extra argument, and if capture feed it to the app
     config_extras_mode allow_config_extras_{config_extras_mode::ignore};
 
     ///  If true, cease processing on an unrecognized option (implies allow_extras) INHERITABLE
     bool prefix_command_{false};
 
     /// If set to true the name was automatically generated from the command line vs a user set name
     bool has_automatic_name_{false};
 
     /// If set to true the subcommand is required to be processed and used, ignored for main app
     bool required_{false};
 
     /// If set to true the subcommand is disabled and cannot be used, ignored for main app
     bool disabled_{false};
 
     /// Flag indicating that the pre_parse_callback has been triggered
     bool pre_parse_called_{false};
 
     /// Flag indicating that the callback for the subcommand should be executed immediately on parse completion which is
     /// before help or ini files are processed. INHERITABLE
     bool immediate_callback_{false};
 
     /// This is a function that runs prior to the start of parsing
     std::function<void(std::size_t)> pre_parse_callback_{};
 
     /// This is a function that runs when parsing has finished.
     std::function<void()> parse_complete_callback_{};
 
     /// This is a function that runs when all processing has completed
     std::function<void()> final_callback_{};
 
     ///@}
     /// @name Options
     ///@{
 
     /// The default values for options, customizable and changeable INHERITABLE
     OptionDefaults option_defaults_{};
 
     /// The list of options, stored locally
     std::vector<Option_p> options_{};
 
     ///@}
     /// @name Help
     ///@{
 
     /// Usage to put after program/subcommand description in the help output INHERITABLE
     std::string usage_{};
 
     /// This is a function that generates a usage to put after program/subcommand description in help output
     std::function<std::string()> usage_callback_{};
 
     /// Footer to put after all options in the help output INHERITABLE
     std::string footer_{};
 
     /// This is a function that generates a footer to put after all other options in help output
     std::function<std::string()> footer_callback_{};
 
     /// A pointer to the help flag if there is one INHERITABLE
     Option *help_ptr_{nullptr};
 
     /// A pointer to the help all flag if there is one INHERITABLE
     Option *help_all_ptr_{nullptr};
 
     /// A pointer to a version flag if there is one
     Option *version_ptr_{nullptr};
 
     /// This is the formatter for help printing. Default provided. INHERITABLE (same pointer)
     std::shared_ptr<FormatterBase> formatter_{new Formatter()};
 
     /// The error message printing function INHERITABLE
     std::function<std::string(const App *, const Error &e)> failure_message_{FailureMessage::simple};
 
     ///@}
     /// @name Parsing
     ///@{
 
     using missing_t = std::vector<std::pair<detail::Classifier, std::string>>;
 
     /// Pair of classifier, string for missing options. (extra detail is removed on returning from parse)
     ///
     /// This is faster and cleaner than storing just a list of strings and reparsing. This may contain the -- separator.
     missing_t missing_{};
 
     /// This is a list of pointers to options with the original parse order
     std::vector<Option *> parse_order_{};
 
     /// This is a list of the subcommands collected, in order
     std::vector<App *> parsed_subcommands_{};
 
     /// this is a list of subcommands that are exclusionary to this one
     std::set<App *> exclude_subcommands_{};
 
     /// This is a list of options which are exclusionary to this App, if the options were used this subcommand should
     /// not be
     std::set<Option *> exclude_options_{};
 
     /// this is a list of subcommands or option groups that are required by this one, the list is not mutual,  the
     /// listed subcommands do not require this one
     std::set<App *> need_subcommands_{};
 
     /// This is a list of options which are required by this app, the list is not mutual, listed options do not need the
     /// subcommand not be
     std::set<Option *> need_options_{};
 
     ///@}
     /// @name Subcommands
     ///@{
 
     /// Storage for subcommand list
     std::vector<App_p> subcommands_{};
 
     /// If true, the program name is not case-sensitive INHERITABLE
     bool ignore_case_{false};
 
     /// If true, the program should ignore underscores INHERITABLE
     bool ignore_underscore_{false};
 
     /// Allow options or other arguments to fallthrough, so that parent commands can collect options after subcommand.
     /// INHERITABLE
     bool fallthrough_{false};
 
     /// Allow subcommands to fallthrough, so that parent commands can trigger other subcommands after subcommand.
     bool subcommand_fallthrough_{true};
 
     /// Allow '/' for options for Windows like options. Defaults to true on Windows, false otherwise. INHERITABLE
     bool allow_windows_style_options_{
 #ifdef _WIN32
         true
 #else
         false
 #endif
     };
     /// specify that positional arguments come at the end of the argument sequence not inheritable
     bool positionals_at_end_{false};
 
     enum class startup_mode : std::uint8_t { stable, enabled, disabled };
     /// specify the startup mode for the app
     /// stable=no change, enabled= startup enabled, disabled=startup disabled
     startup_mode default_startup{startup_mode::stable};
 
     /// if set to true the subcommand can be triggered via configuration files INHERITABLE
     bool configurable_{false};
 
     /// If set to true positional options are validated before assigning INHERITABLE
     bool validate_positionals_{false};
 
     /// If set to true optional vector arguments are validated before assigning INHERITABLE
     bool validate_optional_arguments_{false};
 
     /// indicator that the subcommand is silent and won't show up in subcommands list
     /// This is potentially useful as a modifier subcommand
     bool silent_{false};
 
     /// indicator that the subcommand should allow non-standard option arguments, such as -single_dash_flag
     bool allow_non_standard_options_{false};
 
     /// indicator to allow subcommands to match with prefix matching
     bool allow_prefix_matching_{false};
 
     /// Counts the number of times this command/subcommand was parsed
     std::uint32_t parsed_{0U};
 
     /// Minimum required subcommands (not inheritable!)
     std::size_t require_subcommand_min_{0};
 
     /// Max number of subcommands allowed (parsing stops after this number). 0 is unlimited INHERITABLE
     std::size_t require_subcommand_max_{0};
 
     /// Minimum required options (not inheritable!)
     std::size_t require_option_min_{0};
 
     /// Max number of options allowed. 0 is unlimited (not inheritable)
     std::size_t require_option_max_{0};
 
     /// A pointer to the parent if this is a subcommand
     App *parent_{nullptr};
 
     /// The group membership INHERITABLE
     std::string group_{"SUBCOMMANDS"};
 
     /// Alias names for the subcommand
     std::vector<std::string> aliases_{};
 
     ///@}
     /// @name Config
     ///@{
 
     /// Pointer to the config option
     Option *config_ptr_{nullptr};
 
     /// This is the formatter for help printing. Default provided. INHERITABLE (same pointer)
     std::shared_ptr<Config> config_formatter_{new ConfigTOML()};
 
     ///@}
 
 #ifdef _WIN32
     /// When normalizing argv to UTF-8 on Windows, this is the storage for normalized args.
     std::vector<std::string> normalized_argv_{};
 
     /// When normalizing argv to UTF-8 on Windows, this is the `char**` value returned to the user.
     std::vector<char *> normalized_argv_view_{};
 #endif
 
     /// Special private constructor for subcommand
     App(std::string app_description, std::string app_name, App *parent);
 
   public:
     /// @name Basic
     ///@{
 
     /// Create a new program. Pass in the same arguments as main(), along with a help string.
     explicit App(std::string app_description = "", std::string app_name = "")
         : App(app_description, app_name, nullptr) {
         set_help_flag("-h,--help", "Print this help message and exit");
     }
 
     App(const App &) = delete;
     App &operator=(const App &) = delete;
 
     /// virtual destructor
     virtual ~App() = default;
 
     /// Convert the contents of argv to UTF-8. Only does something on Windows, does nothing elsewhere.
     CLI11_NODISCARD char **ensure_utf8(char **argv);
 
     /// Set a callback for execution when all parsing and processing has completed
     ///
     /// Due to a bug in c++11,
     /// it is not possible to overload on std::function (fixed in c++14
     /// and backported to c++11 on newer compilers). Use capture by reference
     /// to get a pointer to App if needed.
     App *callback(std::function<void()> app_callback) {
         if(immediate_callback_) {
             parse_complete_callback_ = std::move(app_callback);
         } else {
             final_callback_ = std::move(app_callback);
         }
         return this;
     }
 
     /// Set a callback for execution when all parsing and processing has completed
     /// aliased as callback
     App *final_callback(std::function<void()> app_callback) {
         final_callback_ = std::move(app_callback);
         return this;
     }
 
     /// Set a callback to execute when parsing has completed for the app
     ///
     App *parse_complete_callback(std::function<void()> pc_callback) {
         parse_complete_callback_ = std::move(pc_callback);
         return this;
     }
 
     /// Set a callback to execute prior to parsing.
     ///
     App *preparse_callback(std::function<void(std::size_t)> pp_callback) {
         pre_parse_callback_ = std::move(pp_callback);
         return this;
     }
 
     /// Set a name for the app (empty will use parser to set the name)
     App *name(std::string app_name = "");
 
     /// Set an alias for the app
     App *alias(std::string app_name);
 
     /// Remove the error when extras are left over on the command line.
     App *allow_extras(bool allow = true) {
         allow_extras_ = allow;
         return this;
     }
 
     /// Remove the error when extras are left over on the command line.
     App *required(bool require = true) {
         required_ = require;
         return this;
     }
 
     /// Disable the subcommand or option group
     App *disabled(bool disable = true) {
         disabled_ = disable;
         return this;
     }
 
     /// silence the subcommand from showing up in the processed list
     App *silent(bool silence = true) {
         silent_ = silence;
         return this;
     }
 
     /// allow non standard option names
     App *allow_non_standard_option_names(bool allowed = true) {
         allow_non_standard_options_ = allowed;
         return this;
     }
 
     /// allow prefix matching for subcommands
     App *allow_subcommand_prefix_matching(bool allowed = true) {
         allow_prefix_matching_ = allowed;
         return this;
     }
     /// Set the subcommand to be disabled by default, so on clear(), at the start of each parse it is disabled
     App *disabled_by_default(bool disable = true) {
         if(disable) {
             default_startup = startup_mode::disabled;
         } else {
             default_startup = (default_startup == startup_mode::enabled) ? startup_mode::enabled : startup_mode::stable;
         }
         return this;
     }
 
     /// Set the subcommand to be enabled by default, so on clear(), at the start of each parse it is enabled (not
     /// disabled)
     App *enabled_by_default(bool enable = true) {
         if(enable) {
             default_startup = startup_mode::enabled;
         } else {
             default_startup =
                 (default_startup == startup_mode::disabled) ? startup_mode::disabled : startup_mode::stable;
         }
         return this;
     }
 
     /// Set the subcommand callback to be executed immediately on subcommand completion
     App *immediate_callback(bool immediate = true);
 
     /// Set the subcommand to validate positional arguments before assigning
     App *validate_positionals(bool validate = true) {
         validate_positionals_ = validate;
         return this;
     }
 
     /// Set the subcommand to validate optional vector arguments before assigning
     App *validate_optional_arguments(bool validate = true) {
         validate_optional_arguments_ = validate;
         return this;
     }
 
     /// ignore extras in config files
     App *allow_config_extras(bool allow = true) {
         if(allow) {
             allow_config_extras_ = config_extras_mode::capture;
             allow_extras_ = true;
         } else {
             allow_config_extras_ = config_extras_mode::error;
         }
         return this;
     }
 
     /// ignore extras in config files
     App *allow_config_extras(config_extras_mode mode) {
         allow_config_extras_ = mode;
         return this;
     }
 
     /// Do not parse anything after the first unrecognized option (if true) all remaining arguments are stored in
     /// remaining args
     App *prefix_command(bool is_prefix = true) {
         prefix_command_ = is_prefix;
         return this;
     }
 
     /// Ignore case. Subcommands inherit value.
     App *ignore_case(bool value = true);
 
     /// Allow windows style options, such as `/opt`. First matching short or long name used. Subcommands inherit
     /// value.
     App *allow_windows_style_options(bool value = true) {
         allow_windows_style_options_ = value;
         return this;
     }
 
     /// Specify that the positional arguments are only at the end of the sequence
     App *positionals_at_end(bool value = true) {
         positionals_at_end_ = value;
         return this;
     }
 
     /// Specify that the subcommand can be triggered by a config file
     App *configurable(bool value = true) {
         configurable_ = value;
         return this;
     }
 
     /// Ignore underscore. Subcommands inherit value.
     App *ignore_underscore(bool value = true);
 
     /// Set the help formatter
     App *formatter(std::shared_ptr<FormatterBase> fmt) {
         formatter_ = fmt;
         return this;
     }
 
     /// Set the help formatter
     App *formatter_fn(std::function<std::string(const App *, std::string, AppFormatMode)> fmt) {
         formatter_ = std::make_shared<FormatterLambda>(fmt);
         return this;
     }
 
     /// Set the config formatter
     App *config_formatter(std::shared_ptr<Config> fmt) {
         config_formatter_ = fmt;
         return this;
     }
 
     /// Check to see if this subcommand was parsed, true only if received on command line.
     CLI11_NODISCARD bool parsed() const { return parsed_ > 0; }
 
     /// Get the OptionDefault object, to set option defaults
     OptionDefaults *option_defaults() { return &option_defaults_; }
 
     ///@}
     /// @name Adding options
     ///@{
 
     /// Add an option, will automatically understand the type for common types.
     ///
     /// To use, create a variable with the expected type, and pass it in after the name.
     /// After start is called, you can use count to see if the value was passed, and
     /// the value will be initialized properly. Numbers, vectors, and strings are supported.
     ///
     /// ->required(), ->default, and the validators are options,
     /// The positional options take an optional number of arguments.
     ///
     /// For example,
     ///
     ///     std::string filename;
     ///     program.add_option("filename", filename, "description of filename");
     ///
     Option *add_option(std::string option_name,
                        callback_t option_callback,
                        std::string option_description = "",
                        bool defaulted = false,
                        std::function<std::string()> func = {});
 
     /// Add option for assigning to a variable
     template <typename AssignTo,
               typename ConvertTo = AssignTo,
               enable_if_t<!std::is_const<ConvertTo>::value, detail::enabler> = detail::dummy>
     Option *add_option(std::string option_name,
                        AssignTo &variable,  ///< The variable to set
                        std::string option_description = "") {
 
         auto fun = [&variable](const CLI::results_t &res) {  // comment for spacing
             return detail::lexical_conversion<AssignTo, ConvertTo>(res, variable);
         };
 
         Option *opt = add_option(option_name, fun, option_description, false, [&variable]() {
             return CLI::detail::checked_to_string<AssignTo, ConvertTo>(variable);
         });
         opt->type_name(detail::type_name<ConvertTo>());
         // these must be actual lvalues since (std::max) sometimes is defined in terms of references and references
         // to structs used in the evaluation can be temporary so that would cause issues.
         auto Tcount = detail::type_count<AssignTo>::value;
         auto XCcount = detail::type_count<ConvertTo>::value;
         opt->type_size(detail::type_count_min<ConvertTo>::value, (std::max)(Tcount, XCcount));
         opt->expected(detail::expected_count<ConvertTo>::value);
         opt->run_callback_for_default();
         return opt;
     }
 
     /// Add option for assigning to a variable
     template <typename AssignTo, enable_if_t<!std::is_const<AssignTo>::value, detail::enabler> = detail::dummy>
     Option *add_option_no_stream(std::string option_name,
                                  AssignTo &variable,  ///< The variable to set
                                  std::string option_description = "") {
 
         auto fun = [&variable](const CLI::results_t &res) {  // comment for spacing
             return detail::lexical_conversion<AssignTo, AssignTo>(res, variable);
         };
 
         Option *opt = add_option(option_name, fun, option_description, false, []() { return std::string{}; });
         opt->type_name(detail::type_name<AssignTo>());
         opt->type_size(detail::type_count_min<AssignTo>::value, detail::type_count<AssignTo>::value);
         opt->expected(detail::expected_count<AssignTo>::value);
         opt->run_callback_for_default();
         return opt;
     }
 
     /// Add option for a callback of a specific type
     template <typename ArgType>
     Option *add_option_function(std::string option_name,
                                 const std::function<void(const ArgType &)> &func,  ///< the callback to execute
                                 std::string option_description = "") {
 
         auto fun = [func](const CLI::results_t &res) {
             ArgType variable;
             bool result = detail::lexical_conversion<ArgType, ArgType>(res, variable);
             if(result) {
                 func(variable);
             }
             return result;
         };
 
         Option *opt = add_option(option_name, std::move(fun), option_description, false);
         opt->type_name(detail::type_name<ArgType>());
         opt->type_size(detail::type_count_min<ArgType>::value, detail::type_count<ArgType>::value);
         opt->expected(detail::expected_count<ArgType>::value);
         return opt;
     }
 
     /// Add option with no description or variable assignment
     Option *add_option(std::string option_name) {
         return add_option(option_name, CLI::callback_t{}, std::string{}, false);
     }
 
     /// Add option with description but with no variable assignment or callback
     template <typename T,
               enable_if_t<std::is_const<T>::value && std::is_constructible<std::string, T>::value, detail::enabler> =
                   detail::dummy>
     Option *add_option(std::string option_name, T &option_description) {
         return add_option(option_name, CLI::callback_t(), option_description, false);
     }
 
     /// Set a help flag, replace the existing one if present
     Option *set_help_flag(std::string flag_name = "", const std::string &help_description = "");
 
     /// Set a help all flag, replaced the existing one if present
     Option *set_help_all_flag(std::string help_name = "", const std::string &help_description = "");
 
     /// Set a version flag and version display string, replace the existing one if present
     Option *set_version_flag(std::string flag_name = "",
                              const std::string &versionString = "",
                              const std::string &version_help = "Display program version information and exit");
 
     /// Generate the version string through a callback function
     Option *set_version_flag(std::string flag_name,
                              std::function<std::string()> vfunc,
                              const std::string &version_help = "Display program version information and exit");
 
   private:
     /// Internal function for adding a flag
     Option *_add_flag_internal(std::string flag_name, CLI::callback_t fun, std::string flag_description);
 
   public:
     /// Add a flag with no description or variable assignment
     Option *add_flag(std::string flag_name) { return _add_flag_internal(flag_name, CLI::callback_t(), std::string{}); }
 
     /// Add flag with description but with no variable assignment or callback
     /// takes a constant string or a rvalue reference to a string,  if a variable string is passed that variable will be
     /// assigned the results from the flag
     template <typename T,
               enable_if_t<(std::is_const<typename std::remove_reference<T>::type>::value ||
                            std::is_rvalue_reference<T &&>::value) &&
                               std::is_constructible<std::string, typename std::remove_reference<T>::type>::value,
                           detail::enabler> = detail::dummy>
     Option *add_flag(std::string flag_name, T &&flag_description) {
         return _add_flag_internal(flag_name, CLI::callback_t(), std::forward<T>(flag_description));
     }
 
     /// Other type version accepts all other types that are not vectors such as bool, enum, string or other classes
     /// that can be converted from a string
     template <typename T,
               enable_if_t<!detail::is_mutable_container<T>::value && !std::is_const<T>::value &&
                               !std::is_constructible<std::function<void(int)>, T>::value,
                           detail::enabler> = detail::dummy>
     Option *add_flag(std::string flag_name,
                      T &flag_result,  ///< A variable holding the flag result
                      std::string flag_description = "") {
 
         CLI::callback_t fun = [&flag_result](const CLI::results_t &res) {
             using CLI::detail::lexical_cast;
             return lexical_cast(res[0], flag_result);
         };
         auto *opt = _add_flag_internal(flag_name, std::move(fun), std::move(flag_description));
         return detail::default_flag_modifiers<T>(opt);
     }
 
     /// Vector version to capture multiple flags.
     template <typename T,
               enable_if_t<!std::is_assignable<std::function<void(std::int64_t)> &, T>::value, detail::enabler> =
                   detail::dummy>
     Option *add_flag(std::string flag_name,
                      std::vector<T> &flag_results,  ///< A vector of values with the flag results
                      std::string flag_description = "") {
         CLI::callback_t fun = [&flag_results](const CLI::results_t &res) {
             bool retval = true;
             for(const auto &elem : res) {
                 using CLI::detail::lexical_cast;
                 flag_results.emplace_back();
                 retval &= lexical_cast(elem, flag_results.back());
             }
             return retval;
         };
         return _add_flag_internal(flag_name, std::move(fun), std::move(flag_description))
             ->multi_option_policy(MultiOptionPolicy::TakeAll)
             ->run_callback_for_default();
     }
 
     /// Add option for callback that is triggered with a true flag and takes no arguments
     Option *add_flag_callback(std::string flag_name,
                               std::function<void(void)> function,  ///< A function to call, void(void)
                               std::string flag_description = "");
 
     /// Add option for callback with an integer value
     Option *add_flag_function(std::string flag_name,
                               std::function<void(std::int64_t)> function,  ///< A function to call, void(int)
                               std::string flag_description = "");
 
 #ifdef CLI11_CPP14
     /// Add option for callback (C++14 or better only)
     Option *add_flag(std::string flag_name,
                      std::function<void(std::int64_t)> function,  ///< A function to call, void(std::int64_t)
                      std::string flag_description = "") {
         return add_flag_function(std::move(flag_name), std::move(function), std::move(flag_description));
     }
 #endif
 
     /// Set a configuration ini file option, or clear it if no name passed
     Option *set_config(std::string option_name = "",
                        std::string default_filename = "",
                        const std::string &help_message = "Read an ini file",
                        bool config_required = false);
 
     /// Removes an option from the App. Takes an option pointer. Returns true if found and removed.
     bool remove_option(Option *opt);
 
     /// creates an option group as part of the given app
     template <typename T = Option_group>
     T *add_option_group(std::string group_name, std::string group_description = "") {
         if(!detail::valid_alias_name_string(group_name)) {
             throw IncorrectConstruction("option group names may not contain newlines or null characters");
         }
         auto option_group = std::make_shared<T>(std::move(group_description), group_name, this);
         auto *ptr = option_group.get();
         // move to App_p for overload resolution on older gcc versions
         App_p app_ptr = std::static_pointer_cast<App>(option_group);
         // don't inherit the footer in option groups and clear the help flag by default
         app_ptr->footer_ = "";
         app_ptr->set_help_flag();
         add_subcommand(std::move(app_ptr));
         return ptr;
     }
 
     ///@}
     /// @name Subcommands
     ///@{
 
     /// Add a subcommand. Inherits INHERITABLE and OptionDefaults, and help flag
     App *add_subcommand(std::string subcommand_name = "", std::string subcommand_description = "");
 
     /// Add a previously created app as a subcommand
     App *add_subcommand(CLI::App_p subcom);
 
     /// Removes a subcommand from the App. Takes a subcommand pointer. Returns true if found and removed.
     bool remove_subcommand(App *subcom);
 
     /// Check to see if a subcommand is part of this command (doesn't have to be in command line)
     /// returns the first subcommand if passed a nullptr
     App *get_subcommand(const App *subcom) const;
 
     /// Check to see if a subcommand is part of this command (text version)
     CLI11_NODISCARD App *get_subcommand(std::string subcom) const;
 
     /// Get a subcommand by name (noexcept non-const version)
     /// returns null if subcommand doesn't exist
     CLI11_NODISCARD App *get_subcommand_no_throw(std::string subcom) const noexcept;
 
     /// Get a pointer to subcommand by index
     CLI11_NODISCARD App *get_subcommand(int index = 0) const;
 
     /// Check to see if a subcommand is part of this command and get a shared_ptr to it
     CLI::App_p get_subcommand_ptr(App *subcom) const;
 
     /// Check to see if a subcommand is part of this command (text version)
     CLI11_NODISCARD CLI::App_p get_subcommand_ptr(std::string subcom) const;
 
     /// Get an owning pointer to subcommand by index
     CLI11_NODISCARD CLI::App_p get_subcommand_ptr(int index = 0) const;
 
     /// Check to see if an option group is part of this App
     CLI11_NODISCARD App *get_option_group(std::string group_name) const;
 
     /// No argument version of count counts the number of times this subcommand was
     /// passed in. The main app will return 1. Unnamed subcommands will also return 1 unless
     /// otherwise modified in a callback
     CLI11_NODISCARD std::size_t count() const { return parsed_; }
 
     /// Get a count of all the arguments processed in options and subcommands, this excludes arguments which were
     /// treated as extras.
     CLI11_NODISCARD std::size_t count_all() const;
 
     /// Changes the group membership
     App *group(std::string group_name) {
         group_ = group_name;
         return this;
     }
 
     /// The argumentless form of require subcommand requires 1 or more subcommands
     App *require_subcommand() {
         require_subcommand_min_ = 1;
         require_subcommand_max_ = 0;
         return this;
     }
 
     /// Require a subcommand to be given (does not affect help call)
     /// The number required can be given. Negative values indicate maximum
     /// number allowed (0 for any number). Max number inheritable.
     App *require_subcommand(int value) {
         if(value < 0) {
             require_subcommand_min_ = 0;
             require_subcommand_max_ = static_cast<std::size_t>(-value);
         } else {
             require_subcommand_min_ = static_cast<std::size_t>(value);
             require_subcommand_max_ = static_cast<std::size_t>(value);
         }
         return this;
     }
 
     /// Explicitly control the number of subcommands required. Setting 0
     /// for the max means unlimited number allowed. Max number inheritable.
     App *require_subcommand(std::size_t min, std::size_t max) {
         require_subcommand_min_ = min;
         require_subcommand_max_ = max;
         return this;
     }
 
     /// The argumentless form of require option requires 1 or more options be used
     App *require_option() {
         require_option_min_ = 1;
         require_option_max_ = 0;
         return this;
     }
 
     /// Require an option to be given (does not affect help call)
     /// The number required can be given. Negative values indicate maximum
     /// number allowed (0 for any number).
     App *require_option(int value) {
         if(value < 0) {
             require_option_min_ = 0;
             require_option_max_ = static_cast<std::size_t>(-value);
         } else {
             require_option_min_ = static_cast<std::size_t>(value);
             require_option_max_ = static_cast<std::size_t>(value);
         }
         return this;
     }
 
     /// Explicitly control the number of options required. Setting 0
     /// for the max means unlimited number allowed. Max number inheritable.
     App *require_option(std::size_t min, std::size_t max) {
         require_option_min_ = min;
         require_option_max_ = max;
         return this;
     }
 
     /// Set fallthrough, set to true so that options will fallthrough to parent if not recognized in a subcommand
     /// Default from parent, usually set on parent.
     App *fallthrough(bool value = true) {
         fallthrough_ = value;
         return this;
     }
 
     /// Set subcommand fallthrough, set to true so that subcommands on parents are recognized
     App *subcommand_fallthrough(bool value = true) {
         subcommand_fallthrough_ = value;
         return this;
     }
 
     /// Check to see if this subcommand was parsed, true only if received on command line.
     /// This allows the subcommand to be directly checked.
     explicit operator bool() const { return parsed_ > 0; }
 
     ///@}
     /// @name Extras for subclassing
     ///@{
 
     /// This allows subclasses to inject code before callbacks but after parse.
     ///
     /// This does not run if any errors or help is thrown.
     virtual void pre_callback() {}
 
     ///@}
     /// @name Parsing
     ///@{
     //
     /// Reset the parsed data
     void clear();
 
     /// Parses the command line - throws errors.
     /// This must be called after the options are in but before the rest of the program.
     void parse(int argc, const char *const *argv);
     void parse(int argc, const wchar_t *const *argv);
 
   private:
     template <class CharT> void parse_char_t(int argc, const CharT *const *argv);
 
   public:
     /// Parse a single string as if it contained command line arguments.
     /// This function splits the string into arguments then calls parse(std::vector<std::string> &)
     /// the function takes an optional boolean argument specifying if the programName is included in the string to
     /// process
     void parse(std::string commandline, bool program_name_included = false);
     void parse(std::wstring commandline, bool program_name_included = false);
 
     /// The real work is done here. Expects a reversed vector.
     /// Changes the vector to the remaining options.
     void parse(std::vector<std::string> &args);
 
     /// The real work is done here. Expects a reversed vector.
     void parse(std::vector<std::string> &&args);
 
     void parse_from_stream(std::istream &input);
 
     /// Provide a function to print a help message. The function gets access to the App pointer and error.
     void failure_message(std::function<std::string(const App *, const Error &e)> function) {
         failure_message_ = function;
     }
 
     /// Print a nice error message and return the exit code
     int exit(const Error &e, std::ostream &out = std::cout, std::ostream &err = std::cerr) const;
 
     ///@}
     /// @name Post parsing
     ///@{
 
     /// Counts the number of times the given option was passed.
     CLI11_NODISCARD std::size_t count(std::string option_name) const { return get_option(option_name)->count(); }
 
     /// Get a subcommand pointer list to the currently selected subcommands (after parsing by default, in command
     /// line order; use parsed = false to get the original definition list.)
     CLI11_NODISCARD std::vector<App *> get_subcommands() const { return parsed_subcommands_; }
 
     /// Get a filtered subcommand pointer list from the original definition list. An empty function will provide all
     /// subcommands (const)
     std::vector<const App *> get_subcommands(const std::function<bool(const App *)> &filter) const;
 
     /// Get a filtered subcommand pointer list from the original definition list. An empty function will provide all
     /// subcommands
     std::vector<App *> get_subcommands(const std::function<bool(App *)> &filter);
 
     /// Check to see if given subcommand was selected
     bool got_subcommand(const App *subcom) const {
         // get subcom needed to verify that this was a real subcommand
         return get_subcommand(subcom)->parsed_ > 0;
     }
 
     /// Check with name instead of pointer to see if subcommand was selected
     CLI11_NODISCARD bool got_subcommand(std::string subcommand_name) const noexcept {
         App *sub = get_subcommand_no_throw(subcommand_name);
         return (sub != nullptr) ? (sub->parsed_ > 0) : false;
     }
 
     /// Sets excluded options for the subcommand
     App *excludes(Option *opt) {
         if(opt == nullptr) {
             throw OptionNotFound("nullptr passed");
         }
         exclude_options_.insert(opt);
         return this;
     }
 
     /// Sets excluded subcommands for the subcommand
     App *excludes(App *app) {
         if(app == nullptr) {
             throw OptionNotFound("nullptr passed");
         }
         if(app == this) {
             throw OptionNotFound("cannot self reference in needs");
         }
         auto res = exclude_subcommands_.insert(app);
         // subcommand exclusion should be symmetric
         if(res.second) {
             app->exclude_subcommands_.insert(this);
         }
         return this;
     }
 
     App *needs(Option *opt) {
         if(opt == nullptr) {
             throw OptionNotFound("nullptr passed");
         }
         need_options_.insert(opt);
         return this;
     }
 
     App *needs(App *app) {
         if(app == nullptr) {
             throw OptionNotFound("nullptr passed");
         }
         if(app == this) {
             throw OptionNotFound("cannot self reference in needs");
         }
         need_subcommands_.insert(app);
         return this;
     }
 
     /// Removes an option from the excludes list of this subcommand
     bool remove_excludes(Option *opt);
 
     /// Removes a subcommand from the excludes list of this subcommand
     bool remove_excludes(App *app);
 
     /// Removes an option from the needs list of this subcommand
     bool remove_needs(Option *opt);
 
     /// Removes a subcommand from the needs list of this subcommand
     bool remove_needs(App *app);
     ///@}
     /// @name Help
     ///@{
 
     /// Set usage.
     App *usage(std::string usage_string) {
         usage_ = std::move(usage_string);
         return this;
     }
     /// Set usage.
     App *usage(std::function<std::string()> usage_function) {
         usage_callback_ = std::move(usage_function);
         return this;
     }
     /// Set footer.
     App *footer(std::string footer_string) {
         footer_ = std::move(footer_string);
         return this;
     }
     /// Set footer.
     App *footer(std::function<std::string()> footer_function) {
         footer_callback_ = std::move(footer_function);
         return this;
     }
     /// Produce a string that could be read in as a config of the current values of the App. Set default_also to
     /// include default arguments. write_descriptions will print a description for the App and for each option.
     CLI11_NODISCARD std::string config_to_str(bool default_also = false, bool write_description = false) const {
         return config_formatter_->to_config(this, default_also, write_description, "");
     }
 
     /// Makes a help message, using the currently configured formatter
     /// Will only do one subcommand at a time
     CLI11_NODISCARD std::string help(std::string prev = "", AppFormatMode mode = AppFormatMode::Normal) const;
 
     /// Displays a version string
     CLI11_NODISCARD std::string version() const;
     ///@}
     /// @name Getters
     ///@{
 
     /// Access the formatter
     CLI11_NODISCARD std::shared_ptr<FormatterBase> get_formatter() const { return formatter_; }
 
     /// Access the config formatter
     CLI11_NODISCARD std::shared_ptr<Config> get_config_formatter() const { return config_formatter_; }
 
     /// Access the config formatter as a configBase pointer
     CLI11_NODISCARD std::shared_ptr<ConfigBase> get_config_formatter_base() const {
         // This is safer as a dynamic_cast if we have RTTI, as Config -> ConfigBase
 #if CLI11_USE_STATIC_RTTI == 0
         return std::dynamic_pointer_cast<ConfigBase>(config_formatter_);
 #else
         return std::static_pointer_cast<ConfigBase>(config_formatter_);
 #endif
     }
 
     /// Get the app or subcommand description
     CLI11_NODISCARD std::string get_description() const { return description_; }
 
     /// Set the description of the app
     App *description(std::string app_description) {
         description_ = std::move(app_description);
         return this;
     }
 
     /// Get the list of options (user facing function, so returns raw pointers), has optional filter function
     std::vector<const Option *> get_options(const std::function<bool(const Option *)> filter = {}) const;
 
     /// Non-const version of the above
     std::vector<Option *> get_options(const std::function<bool(Option *)> filter = {});
 
     /// Get an option by name (noexcept non-const version)
     CLI11_NODISCARD Option *get_option_no_throw(std::string option_name) noexcept;
 
     /// Get an option by name (noexcept const version)
     CLI11_NODISCARD const Option *get_option_no_throw(std::string option_name) const noexcept;
 
     /// Get an option by name
     CLI11_NODISCARD const Option *get_option(std::string option_name) const {
         const auto *opt = get_option_no_throw(option_name);
         if(opt == nullptr) {
             throw OptionNotFound(option_name);
         }
         return opt;
     }
 
     /// Get an option by name (non-const version)
     Option *get_option(std::string option_name) {
         auto *opt = get_option_no_throw(option_name);
         if(opt == nullptr) {
             throw OptionNotFound(option_name);
         }
         return opt;
     }
 
     /// Shortcut bracket operator for getting a pointer to an option
     const Option *operator[](const std::string &option_name) const { return get_option(option_name); }
 
     /// Shortcut bracket operator for getting a pointer to an option
     const Option *operator[](const char *option_name) const { return get_option(option_name); }
 
     /// Check the status of ignore_case
     CLI11_NODISCARD bool get_ignore_case() const { return ignore_case_; }
 
     /// Check the status of ignore_underscore
     CLI11_NODISCARD bool get_ignore_underscore() const { return ignore_underscore_; }
 
     /// Check the status of fallthrough
     CLI11_NODISCARD bool get_fallthrough() const { return fallthrough_; }
 
     /// Check the status of subcommand fallthrough
     CLI11_NODISCARD bool get_subcommand_fallthrough() const { return subcommand_fallthrough_; }
 
     /// Check the status of the allow windows style options
     CLI11_NODISCARD bool get_allow_windows_style_options() const { return allow_windows_style_options_; }
 
     /// Check the status of the allow windows style options
     CLI11_NODISCARD bool get_positionals_at_end() const { return positionals_at_end_; }
 
     /// Check the status of the allow windows style options
     CLI11_NODISCARD bool get_configurable() const { return configurable_; }
 
     /// Get the group of this subcommand
     CLI11_NODISCARD const std::string &get_group() const { return group_; }
 
     /// Generate and return the usage.
     CLI11_NODISCARD std::string get_usage() const {
         return (usage_callback_) ? usage_callback_() + '\n' + usage_ : usage_;
     }
 
     /// Generate and return the footer.
     CLI11_NODISCARD std::string get_footer() const {
         return (footer_callback_) ? footer_callback_() + '\n' + footer_ : footer_;
     }
 
     /// Get the required min subcommand value
     CLI11_NODISCARD std::size_t get_require_subcommand_min() const { return require_subcommand_min_; }
 
     /// Get the required max subcommand value
     CLI11_NODISCARD std::size_t get_require_subcommand_max() const { return require_subcommand_max_; }
 
     /// Get the required min option value
     CLI11_NODISCARD std::size_t get_require_option_min() const { return require_option_min_; }
 
     /// Get the required max option value
     CLI11_NODISCARD std::size_t get_require_option_max() const { return require_option_max_; }
 
     /// Get the prefix command status
     CLI11_NODISCARD bool get_prefix_command() const { return prefix_command_; }
 
     /// Get the status of allow extras
     CLI11_NODISCARD bool get_allow_extras() const { return allow_extras_; }
 
     /// Get the status of required
     CLI11_NODISCARD bool get_required() const { return required_; }
 
     /// Get the status of disabled
     CLI11_NODISCARD bool get_disabled() const { return disabled_; }
 
     /// Get the status of silence
     CLI11_NODISCARD bool get_silent() const { return silent_; }
 
     /// Get the status of allowing non standard option names
     CLI11_NODISCARD bool get_allow_non_standard_option_names() const { return allow_non_standard_options_; }
 
     /// Get the status of allowing prefix matching for subcommands
     CLI11_NODISCARD bool get_allow_subcommand_prefix_matching() const { return allow_prefix_matching_; }
 
     /// Get the status of disabled
     CLI11_NODISCARD bool get_immediate_callback() const { return immediate_callback_; }
 
     /// Get the status of disabled by default
     CLI11_NODISCARD bool get_disabled_by_default() const { return (default_startup == startup_mode::disabled); }
 
     /// Get the status of disabled by default
     CLI11_NODISCARD bool get_enabled_by_default() const { return (default_startup == startup_mode::enabled); }
     /// Get the status of validating positionals
     CLI11_NODISCARD bool get_validate_positionals() const { return validate_positionals_; }
     /// Get the status of validating optional vector arguments
     CLI11_NODISCARD bool get_validate_optional_arguments() const { return validate_optional_arguments_; }
 
     /// Get the status of allow extras
     CLI11_NODISCARD config_extras_mode get_allow_config_extras() const { return allow_config_extras_; }
 
     /// Get a pointer to the help flag.
     Option *get_help_ptr() { return help_ptr_; }
 
     /// Get a pointer to the help flag. (const)
     CLI11_NODISCARD const Option *get_help_ptr() const { return help_ptr_; }
 
     /// Get a pointer to the help all flag. (const)
     CLI11_NODISCARD const Option *get_help_all_ptr() const { return help_all_ptr_; }
 
     /// Get a pointer to the config option.
     Option *get_config_ptr() { return config_ptr_; }
 
     /// Get a pointer to the config option. (const)
     CLI11_NODISCARD const Option *get_config_ptr() const { return config_ptr_; }
 
     /// Get a pointer to the version option.
     Option *get_version_ptr() { return version_ptr_; }
 
     /// Get a pointer to the version option. (const)
     CLI11_NODISCARD const Option *get_version_ptr() const { return version_ptr_; }
 
     /// Get the parent of this subcommand (or nullptr if main app)
     App *get_parent() { return parent_; }
 
     /// Get the parent of this subcommand (or nullptr if main app) (const version)
     CLI11_NODISCARD const App *get_parent() const { return parent_; }
 
     /// Get the name of the current app
     CLI11_NODISCARD const std::string &get_name() const { return name_; }
 
     /// Get the aliases of the current app
     CLI11_NODISCARD const std::vector<std::string> &get_aliases() const { return aliases_; }
 
     /// clear all the aliases of the current App
     App *clear_aliases() {
         aliases_.clear();
         return this;
     }
 
     /// Get a display name for an app
     CLI11_NODISCARD std::string get_display_name(bool with_aliases = false) const;
 
     /// Check the name, case-insensitive and underscore insensitive, and prefix matching if set
     /// @return true if matched
     CLI11_NODISCARD bool check_name(std::string name_to_check) const;
 
     /// @brief  enumeration of matching possibilities
     enum class NameMatch : std::uint8_t { none = 0, exact = 1, prefix = 2 };
 
     /// Check the name, case-insensitive and underscore insensitive if set
     /// @return NameMatch::none if no match, NameMatch::exact if the match is exact NameMatch::prefix if prefix is
     /// enabled and a prefix matches
     CLI11_NODISCARD NameMatch check_name_detail(std::string name_to_check) const;
 
     /// Get the groups available directly from this option (in order)
     CLI11_NODISCARD std::vector<std::string> get_groups() const;
 
     /// This gets a vector of pointers with the original parse order
     CLI11_NODISCARD const std::vector<Option *> &parse_order() const { return parse_order_; }
 
     /// This returns the missing options from the current subcommand
     CLI11_NODISCARD std::vector<std::string> remaining(bool recurse = false) const;
 
     /// This returns the missing options in a form ready for processing by another command line program
     CLI11_NODISCARD std::vector<std::string> remaining_for_passthrough(bool recurse = false) const;
 
     /// This returns the number of remaining options, minus the -- separator
     CLI11_NODISCARD std::size_t remaining_size(bool recurse = false) const;
 
     ///@}
 
   protected:
     /// Check the options to make sure there are no conflicts.
     ///
     /// Currently checks to see if multiple positionals exist with unlimited args and checks if the min and max options
     /// are feasible
     void _validate() const;
 
     /// configure subcommands to enable parsing through the current object
     /// set the correct fallthrough and prefix for nameless subcommands and manage the automatic enable or disable
     /// makes sure parent is set correctly
     void _configure();
 
     /// Internal function to run (App) callback, bottom up
     void run_callback(bool final_mode = false, bool suppress_final_callback = false);
 
     /// Check to see if a subcommand is valid. Give up immediately if subcommand max has been reached.
     CLI11_NODISCARD bool _valid_subcommand(const std::string &current, bool ignore_used = true) const;
 
     /// Selects a Classifier enum based on the type of the current argument
     CLI11_NODISCARD detail::Classifier _recognize(const std::string &current,
                                                   bool ignore_used_subcommands = true) const;
 
     // The parse function is now broken into several parts, and part of process
 
     /// Read and process a configuration file (main app only)
     void _process_config_file();
 
     /// Read and process a particular configuration file
     bool _process_config_file(const std::string &config_file, bool throw_error);
 
     /// Get envname options if not yet passed. Runs on *all* subcommands.
     void _process_env();
 
     /// Process callbacks. Runs on *all* subcommands.
     void _process_callbacks(CallbackPriority priority);
 
     /// Run help flag processing if any are found.
     ///
     /// The flags allow recursive calls to remember if there was a help flag on a parent.
     void _process_help_flags(CallbackPriority priority, bool trigger_help = false, bool trigger_all_help = false) const;
 
     /// Verify required options and cross requirements. Subcommands too (only if selected).
     void _process_requirements();
 
     /// Process callbacks and such.
     void _process();
 
     /// Throw an error if anything is left over and should not be.
     void _process_extras();
 
     /// Throw an error if anything is left over and should not be.
     /// Modifies the args to fill in the missing items before throwing.
     void _process_extras(std::vector<std::string> &args);
 
     /// Internal function to recursively increment the parsed counter on the current app as well unnamed subcommands
     void increment_parsed();
 
     /// Internal parse function
     void _parse(std::vector<std::string> &args);
 
     /// Internal parse function
     void _parse(std::vector<std::string> &&args);
 
     /// Internal function to parse a stream
     void _parse_stream(std::istream &input);
 
     /// Parse one config param, return false if not found in any subcommand, remove if it is
     ///
     /// If this has more than one dot.separated.name, go into the subcommand matching it
     /// Returns true if it managed to find the option, if false you'll need to remove the arg manually.
     void _parse_config(const std::vector<ConfigItem> &args);
 
     /// Fill in a single config option
     bool _parse_single_config(const ConfigItem &item, std::size_t level = 0);
 
     /// @brief store the results for a flag like option
     bool _add_flag_like_result(Option *op, const ConfigItem &item, const std::vector<std::string> &inputs);
 
     /// Parse "one" argument (some may eat more than one), delegate to parent if fails, add to missing if missing
     /// from main return false if the parse has failed and needs to return to parent
     bool _parse_single(std::vector<std::string> &args, bool &positional_only);
 
     /// Count the required remaining positional arguments
     CLI11_NODISCARD std::size_t _count_remaining_positionals(bool required_only = false) const;
 
     /// Count the required remaining positional arguments
     CLI11_NODISCARD bool _has_remaining_positionals() const;
 
     /// Parse a positional, go up the tree to check
     /// @param haltOnSubcommand if set to true the operation will not process subcommands merely return false
     /// Return true if the positional was used false otherwise
     bool _parse_positional(std::vector<std::string> &args, bool haltOnSubcommand);
 
     /// Locate a subcommand by name with two conditions, should disabled subcommands be ignored, and should used
     /// subcommands be ignored
     CLI11_NODISCARD App *
     _find_subcommand(const std::string &subc_name, bool ignore_disabled, bool ignore_used) const noexcept;
 
     /// Parse a subcommand, modify args and continue
     ///
     /// Unlike the others, this one will always allow fallthrough
     /// return true if the subcommand was processed false otherwise
     bool _parse_subcommand(std::vector<std::string> &args);
 
     /// Parse a short (false) or long (true) argument, must be at the top of the list
     /// if local_processing_only is set to true then fallthrough is disabled will return false if not found
     /// return true if the argument was processed or false if nothing was done
     bool _parse_arg(std::vector<std::string> &args, detail::Classifier current_type, bool local_processing_only);
 
     /// Trigger the pre_parse callback if needed
     void _trigger_pre_parse(std::size_t remaining_args);
 
     /// Get the appropriate parent to fallthrough to which is the first one that has a name or the main app
     App *_get_fallthrough_parent();
 
     /// Helper function to run through all possible comparisons of subcommand names to check there is no overlap
     CLI11_NODISCARD const std::string &_compare_subcommand_names(const App &subcom, const App &base) const;
 
     /// Helper function to place extra values in the most appropriate position
     void _move_to_missing(detail::Classifier val_type, const std::string &val);
 
   public:
     /// function that could be used by subclasses of App to shift options around into subcommands
     void _move_option(Option *opt, App *app);
 };  // namespace CLI
 
 /// Extension of App to better manage groups of options
 class Option_group : public App {
   public:
     Option_group(std::string group_description, std::string group_name, App *parent)
         : App(std::move(group_description), "", parent) {
         group(group_name);
         // option groups should have automatic fallthrough
         if(group_name.empty() || group_name.front() == '+') {
             // help will not be used by default in these contexts
             set_help_flag("");
             set_help_all_flag("");
         }
     }
     using App::add_option;
     /// Add an existing option to the Option_group
     Option *add_option(Option *opt) {
         if(get_parent() == nullptr) {
             throw OptionNotFound("Unable to locate the specified option");
         }
         get_parent()->_move_option(opt, this);
         return opt;
     }
     /// Add an existing option to the Option_group
     void add_options(Option *opt) { add_option(opt); }
     /// Add a bunch of options to the group
     template <typename... Args> void add_options(Option *opt, Args... args) {
         add_option(opt);
         add_options(args...);
     }
     using App::add_subcommand;
     /// Add an existing subcommand to be a member of an option_group
     App *add_subcommand(App *subcom) {
         App_p subc = subcom->get_parent()->get_subcommand_ptr(subcom);
         subc->get_parent()->remove_subcommand(subcom);
         add_subcommand(std::move(subc));
         return subcom;
     }
 };
 
 /// Helper function to enable one option group/subcommand when another is used
 CLI11_INLINE void TriggerOn(App *trigger_app, App *app_to_enable);
 
 /// Helper function to enable one option group/subcommand when another is used
 CLI11_INLINE void TriggerOn(App *trigger_app, std::vector<App *> apps_to_enable);
 
 /// Helper function to disable one option group/subcommand when another is used
 CLI11_INLINE void TriggerOff(App *trigger_app, App *app_to_enable);
 
 /// Helper function to disable one option group/subcommand when another is used
 CLI11_INLINE void TriggerOff(App *trigger_app, std::vector<App *> apps_to_enable);
 
 /// Helper function to mark an option as deprecated
 CLI11_INLINE void deprecate_option(Option *opt, const std::string &replacement = "");
 
 /// Helper function to mark an option as deprecated
 inline void deprecate_option(App *app, const std::string &option_name, const std::string &replacement = "") {
     auto *opt = app->get_option(option_name);
     deprecate_option(opt, replacement);
 }
 
 /// Helper function to mark an option as deprecated
 inline void deprecate_option(App &app, const std::string &option_name, const std::string &replacement = "") {
     auto *opt = app.get_option(option_name);
     deprecate_option(opt, replacement);
 }
 
 /// Helper function to mark an option as retired
 CLI11_INLINE void retire_option(App *app, Option *opt);
 
 /// Helper function to mark an option as retired
 CLI11_INLINE void retire_option(App &app, Option *opt);
 
 /// Helper function to mark an option as retired
 CLI11_INLINE void retire_option(App *app, const std::string &option_name);
 
 /// Helper function to mark an option as retired
 CLI11_INLINE void retire_option(App &app, const std::string &option_name);
 
 namespace detail {
 /// This class is simply to allow tests access to App's protected functions
 struct AppFriend {
 #ifdef CLI11_CPP14
 
     /// Wrap _parse_short, perfectly forward arguments and return
     template <typename... Args> static decltype(auto) parse_arg(App *app, Args &&...args) {
         return app->_parse_arg(std::forward<Args>(args)...);
     }
 
     /// Wrap _parse_subcommand, perfectly forward arguments and return
     template <typename... Args> static decltype(auto) parse_subcommand(App *app, Args &&...args) {
         return app->_parse_subcommand(std::forward<Args>(args)...);
     }
 #else
     /// Wrap _parse_short, perfectly forward arguments and return
     template <typename... Args>
     static auto parse_arg(App *app, Args &&...args) ->
         typename std::result_of<decltype (&App::_parse_arg)(App, Args...)>::type {
         return app->_parse_arg(std::forward<Args>(args)...);
     }
 
     /// Wrap _parse_subcommand, perfectly forward arguments and return
     template <typename... Args>
     static auto parse_subcommand(App *app, Args &&...args) ->
         typename std::result_of<decltype (&App::_parse_subcommand)(App, Args...)>::type {
         return app->_parse_subcommand(std::forward<Args>(args)...);
     }
 #endif
     /// Wrap the fallthrough parent function to make sure that is working correctly
     static App *get_fallthrough_parent(App *app) { return app->_get_fallthrough_parent(); }
 };
 }  // namespace detail
 
 // [CLI11:app_hpp:end]
 }  // namespace CLI
 
 #ifndef CLI11_COMPILE
 #include "impl/App_inl.hpp"  // IWYU pragma: export
 #endif

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