Upgrade CLI11 to 2.3.1 (#3301)

src/mlpack/bindings/cli/third_party/CLI/CLI11.hpp

@@ -1,11 +1,11 @@
-// CLI11: Version 2.3.0
+// CLI11: Version 2.3.1
 // Originally designed by Henry Schreiner
 // https://github.com/CLIUtils/CLI11
 //
 // This is a standalone header file generated by MakeSingleHeader.py in CLI11/scripts
-// from: v2.3.0
+// from: v2.3.1
 //
-// CLI11 2.3.0 Copyright (c) 2017-2022 University of Cincinnati, developed by Henry
+// CLI11 2.3.1 Copyright (c) 2017-2022 University of Cincinnati, developed by Henry
 // Schreiner under NSF AWARD 1414736. All rights reserved.
 //
 // Redistribution and use in source and binary forms of CLI11, with or without
@@ -34,34 +34,34 @@
 #pragma once
 
 // Standard combined includes:
-#include <iterator>
-#include <fstream>
-#include <tuple>
-#include <iostream>
-#include <cstdint>
-#include <algorithm>
-#include <stdexcept>
-#include <map>
-#include <iomanip>
-#include <utility>
-#include <vector>
 #include <functional>
 #include <locale>
-#include <string>
-#include <cmath>
-#include <numeric>
+#include <cstdint>
+#include <iomanip>
 #include <memory>
-#include <sstream>
 #include <exception>
+#include <stdexcept>
+#include <string>
+#include <vector>
+#include <iterator>
+#include <algorithm>
+#include <sstream>
+#include <cmath>
 #include <type_traits>
-#include <set>
 #include <limits>
+#include <set>
+#include <utility>
+#include <map>
+#include <iostream>
+#include <numeric>
+#include <fstream>
+#include <tuple>
 
 
 #define CLI11_VERSION_MAJOR 2
 #define CLI11_VERSION_MINOR 3
-#define CLI11_VERSION_PATCH 0
-#define CLI11_VERSION "2.3.0"
+#define CLI11_VERSION_PATCH 1
+#define CLI11_VERSION "2.3.1"
 
 
 
@@ -2671,7 +2671,7 @@ class Config {
         if(item.inputs.empty()) {
             return "{}";
         }
-        throw ConversionError::TooManyInputsFlag(item.fullname());
+        throw ConversionError::TooManyInputsFlag(item.fullname());  // LCOV_EXCL_LINE
     }
 
     /// Parse a config file, throw an error (ParseError:ConfigParseError or FileError) on failure
@@ -3478,7 +3478,7 @@ class AsNumberWithUnit : public Validator {
 
         // transform function
         func_ = [mapping, opts](std::string &input) -> std::string {
-            Number num;
+            Number num{};
 
             detail::rtrim(input);
             if(input.empty()) {
@@ -3742,7 +3742,7 @@ CLI11_INLINE path_type check_path(const char *file) noexcept {
         return path_type::nonexistent;
     }
     switch(stat.type()) {
-    case std::filesystem::file_type::none:
+    case std::filesystem::file_type::none:  // LCOV_EXCL_LINE
     case std::filesystem::file_type::not_found:
         return path_type::nonexistent;
     case std::filesystem::file_type::directory:
@@ -3993,6 +3993,8 @@ class FormatterBase {
     FormatterBase() = default;
     FormatterBase(const FormatterBase &) = default;
     FormatterBase(FormatterBase &&) = default;
+    FormatterBase &operator=(const FormatterBase &) = default;
+    FormatterBase &operator=(FormatterBase &&) = default;
 
     /// Adding a destructor in this form to work around bug in GCC 4.7
     virtual ~FormatterBase() noexcept {}  // NOLINT(modernize-use-equals-default)
@@ -4054,6 +4056,8 @@ class Formatter : public FormatterBase {
     Formatter() = default;
     Formatter(const Formatter &) = default;
     Formatter(Formatter &&) = default;
+    Formatter &operator=(const Formatter &) = default;
+    Formatter &operator=(Formatter &&) = default;
 
     /// @name Overridables
     ///@{
@@ -7307,6 +7311,15 @@ CLI11_NODISCARD CLI11_INLINE CLI::App_p App::get_subcommand_ptr(int index) const
     throw OptionNotFound(std::to_string(index));
 }
 
+CLI11_NODISCARD CLI11_INLINE CLI::App *App::get_option_group(std::string group_name) const {
+    for(const App_p &app : subcommands_) {
+        if(app->name_.empty() && app->group_ == group_name) {
+            return app.get();
+        }
+    }
+    throw OptionNotFound(group_name);
+}
+
 CLI11_NODISCARD CLI11_INLINE std::size_t App::count_all() const {
     std::size_t cnt{0};
     for(const auto &opt : options_) {
@@ -9469,7 +9482,7 @@ CLI11_INLINE std::string Formatter::make_footer(const App *app) const {
     if(footer.empty()) {
         return std::string{};
     }
-    return footer + "\n";
+    return "\n" + footer + "\n";
 }
 
 CLI11_INLINE std::string Formatter::make_help(const App *app, std::string name, AppFormatMode mode) const {
@@ -9491,7 +9504,7 @@ CLI11_INLINE std::string Formatter::make_help(const App *app, std::string name,
     out << make_positionals(app);
     out << make_groups(app, mode);
     out << make_subcommands(app, mode);
-    out << '\n' << make_footer(app);
+    out << make_footer(app);
 
     return out.str();
 }