1 /* Copyright (c) 2016-2022. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
14 #include <initializer_list>
18 #include <type_traits>
22 #include <xbt/sysdep.h>
23 #include <xbt/utility.hpp>
30 template<class T> inline
31 std::string to_string(T&& value)
33 return std::to_string(std::forward<T>(value));
35 inline std::string const& to_string(std::string& value)
39 inline std::string const& to_string(std::string const& value)
43 inline std::string to_string(std::string&& value)
45 return std::move(value);
50 template <class T> XBT_PUBLIC void set_default(const char* name, T value);
52 extern template XBT_PUBLIC void set_default<int>(const char* name, int value);
53 extern template XBT_PUBLIC void set_default<double>(const char* name, double value);
54 extern template XBT_PUBLIC void set_default<bool>(const char* name, bool value);
55 extern template XBT_PUBLIC void set_default<std::string>(const char* name, std::string value);
57 XBT_PUBLIC bool is_default(const char* name);
61 template <class T> XBT_PUBLIC void set_value(const char* name, T value);
63 extern template XBT_PUBLIC void set_value<int>(const char* name, int value);
64 extern template XBT_PUBLIC void set_value<double>(const char* name, double value);
65 extern template XBT_PUBLIC void set_value<bool>(const char* name, bool value);
66 extern template XBT_PUBLIC void set_value<std::string>(const char* name, std::string value);
68 XBT_PUBLIC void set_as_string(const char* name, const std::string& value);
69 XBT_PUBLIC void set_parse(const std::string& options);
73 template <class T> XBT_PUBLIC T const& get_value(const std::string& name);
75 extern template XBT_PUBLIC int const& get_value<int>(const std::string& name);
76 extern template XBT_PUBLIC double const& get_value<double>(const std::string& name);
77 extern template XBT_PUBLIC bool const& get_value<bool>(const std::string& name);
78 extern template XBT_PUBLIC std::string const& get_value<std::string>(const std::string& name);
82 XBT_PUBLIC void alias(const char* realname, std::initializer_list<const char*> aliases);
86 /** Register a configuration flag
88 * @param name name of the option
89 * @param description Description of the option
90 * @param value Initial/default value
91 * @param callback called with the option value
94 XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, T value,
95 std::function<void(const T&)> callback = std::function<void(const T&)>());
97 XBT_PUBLIC void declare_flag(const std::string& name, std::initializer_list<const char*> aliases,
98 const std::string& description, T value,
99 std::function<void(const T&)> callback = std::function<void(const T&)>())
101 declare_flag(name, description, std::move(value), std::move(callback));
102 alias(name.c_str(), aliases);
105 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, int value,
106 std::function<void(int const&)> callback);
107 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, double value,
108 std::function<void(double const&)> callback);
109 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, bool value,
110 std::function<void(bool const&)> callback);
111 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, std::string value,
112 std::function<void(std::string const&)> callback);
114 /** Bind a variable to configuration flag
116 * @param value Bound variable
117 * @param name Flag name
118 * @param description Option description
120 template <class T> void bind_flag(T& value, const char* name, const char* description)
122 declare_flag<T>(name, description, value, [&value](T const& val) { value = val; });
126 void bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description)
128 bind_flag(value, name, description);
129 alias(name, aliases);
132 /** Bind a variable to configuration flag
136 * simgrid::config::bind_flag(a, "x", [](int x) {
137 * if (x < x_min || x => x_max)
138 * throw std::range_error("must be in [x_min, x_max)")
142 // F is a checker, F : T& -> ()
143 template <class T, class F>
144 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>
145 bind_flag(T& value, const char* name, const char* description, F callback)
147 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
149 value = std::move(val);
153 template <class T, class F>
154 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>
155 bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description, F callback)
157 bind_flag(value, name, description, std::move(callback));
158 alias(name, aliases);
162 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const std::string&>()))>::value,
164 bind_flag(std::string& value, const char* name, const char* description,
165 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
167 declare_flag(name, description, value,
168 std::function<void(const std::string&)>([&value, name, valid_values, callback](const std::string& val) {
170 if (valid_values.find(val) != valid_values.end()) {
174 std::string mesg = "\n";
176 mesg += std::string("Possible values for option ") + name + ":\n";
178 mesg += std::string("Invalid value '") + val + "' for option " + name + ". Possible values:\n";
179 for (auto const& kv : valid_values)
180 mesg += " - '" + kv.first + "': " + kv.second + (kv.first == value ? " <=== DEFAULT" : "") + "\n";
181 xbt_die("%s", mesg.c_str());
185 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const std::string&>()))>::value,
187 bind_flag(std::string& value, const char* name, std::initializer_list<const char*> aliases, const char* description,
188 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
190 bind_flag(value, name, description, valid_values, std::move(callback));
191 alias(name, aliases);
194 /** Bind a variable to configuration flag
198 * simgrid::config::bind_flag(a, "x", [](int x) { return x > 0; });
201 // F is a predicate, F : T const& -> bool
202 template <class T, class F>
203 typename std::enable_if_t<std::is_same<bool, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>
204 bind_flag(T& value, const char* name, const char* description, F callback)
206 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
207 if (not callback(val))
208 throw std::range_error("invalid value.");
209 value = std::move(val);
213 /** A variable bound to a CLI option
216 * static simgrid::config::Flag<int> answer("answer", "Expected answer", 42);
217 * static simgrid::config::Flag<std::string> name("name", "Ford Perfect", "John Doe");
218 * static simgrid::config::Flag<double> gamma("gamma", "Gamma factor", 1.987);
229 * @param name Flag name
230 * @param desc Flag description
231 * @param value Flag initial/default value
233 Flag(const char* name, const char* desc, xbt::type_identity_t<T> value) : value_(value), name_(name)
235 simgrid::config::bind_flag(value_, name, desc);
238 /** Constructor taking also an array of aliases for name */
239 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, xbt::type_identity_t<T> value)
240 : value_(value), name_(name)
242 simgrid::config::bind_flag(value_, name, aliases, desc);
245 /* A constructor accepting a callback that will be passed the parameter.
246 * It can either return a boolean (informing whether the parameter is valid), or returning void.
249 Flag(const char* name, const char* desc, xbt::type_identity_t<T> value, F callback) : value_(value), name_(name)
251 simgrid::config::bind_flag(value_, name, desc, std::move(callback));
255 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, xbt::type_identity_t<T> value,
257 : value_(value), name_(name)
259 simgrid::config::bind_flag(value_, name, aliases, desc, std::move(callback));
262 /* A constructor accepting a map of valid values -> their description,
263 * and producing an informative error message when an invalid value is passed, or when help is passed as a value.
266 Flag(const char* name, const char* desc, xbt::type_identity_t<T> value,
267 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
268 : value_(value), name_(name)
270 simgrid::config::bind_flag(value_, name, desc, valid_values, std::move(callback));
273 /* A constructor with everything */
275 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, xbt::type_identity_t<T> value,
276 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
277 : value_(value), name_(name)
279 simgrid::config::bind_flag(value_, name, aliases, desc, valid_values, std::move(callback));
283 Flag(Flag const&) = delete;
284 Flag& operator=(Flag const&) = delete;
286 // Get the underlying value:
287 T& get() { return value_; }
288 T const& get() const { return value_; }
290 const std::string& get_name() const { return name_; }
291 // Implicit conversion to the underlying type:
292 operator T&() { return value_; }
293 operator T const&() const{ return value_; }
295 // Basic interop with T:
297 Flag& operator=(U const& that) { value_ = that; return *this; }
299 Flag& operator=(U&& that) { value_ = std::forward<U>(that); return *this; }
301 bool operator==(U const& that) const { return value_ == that; }
303 bool operator!=(U const& that) const { return value_ != that; }
305 bool operator<(U const& that) const { return value_ < that; }
307 bool operator>(U const& that) const { return value_ > that; }
309 bool operator<=(U const& that) const { return value_ <= that; }
311 bool operator>=(U const& that) const { return value_ >= that; }
314 XBT_PUBLIC void finalize();
315 XBT_PUBLIC void show_aliases();
316 XBT_PUBLIC void help();
318 } // namespace config
319 } // namespace simgrid