1 /* Copyright (c) 2016-2023. 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 void declare_flag(const std::string& name, std::initializer_list<const char*> aliases, const std::string& description,
98 T value, std::function<void(const T&)> callback = std::function<void(const T&)>())
100 declare_flag(name, description, std::move(value), std::move(callback));
101 alias(name.c_str(), aliases);
104 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, int value,
105 std::function<void(int const&)> callback);
106 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, double value,
107 std::function<void(double const&)> callback);
108 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, bool value,
109 std::function<void(bool const&)> callback);
110 extern template XBT_PUBLIC void declare_flag(const std::string& name, const std::string& description, std::string value,
111 std::function<void(std::string const&)> callback);
113 /** Bind a variable to configuration flag
115 * @param value Bound variable
116 * @param name Flag name
117 * @param description Option description
119 template <class T> void bind_flag(T& value, const char* name, const char* description)
121 declare_flag<T>(name, description, value, [&value](T const& val) { value = val; });
125 void bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description)
127 bind_flag(value, name, description);
128 alias(name, aliases);
131 /** Bind a variable to configuration flag
135 * simgrid::config::bind_flag(a, "x", [](int x) {
136 * if (x < x_min || x => x_max)
137 * throw std::range_error("must be in [x_min, x_max)")
141 // F is a checker, F : T& -> ()
142 template <class T, class F>
143 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>
144 bind_flag(T& value, const char* name, const char* description, F callback)
146 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
148 value = std::move(val);
152 template <class T, class F>
153 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>
154 bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description, F callback)
156 bind_flag(value, name, description, std::move(callback));
157 alias(name, aliases);
161 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const std::string&>()))>::value,
163 bind_flag(std::string& value, const char* name, const char* description,
164 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
166 declare_flag(name, description, value,
167 std::function<void(const std::string&)>([&value, name, valid_values, callback](const std::string& val) {
169 if (valid_values.find(val) != valid_values.end()) {
173 std::string mesg = "\n";
175 mesg += std::string("Possible values for option ") + name + ":\n";
177 mesg += "Invalid value '" + val + "' for option " + name + ". Possible values:\n";
178 for (auto const& kv : valid_values)
179 mesg += " - '" + kv.first + "': " + kv.second + (kv.first == value ? " <=== DEFAULT" : "") + "\n";
180 xbt_die("%s", mesg.c_str());
184 typename std::enable_if_t<std::is_same<void, decltype(std::declval<F>()(std::declval<const std::string&>()))>::value,
186 bind_flag(std::string& value, const char* name, std::initializer_list<const char*> aliases, const char* description,
187 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
189 bind_flag(value, name, description, valid_values, std::move(callback));
190 alias(name, aliases);
193 /** Bind a variable to configuration flag
197 * simgrid::config::bind_flag(a, "x", [](int x) { return x > 0; });
200 // F is a predicate, F : T const& -> bool
201 template <class T, class F>
202 typename std::enable_if_t<std::is_same<bool, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>
203 bind_flag(T& value, const char* name, const char* description, F callback)
205 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
206 if (not callback(val))
207 throw std::range_error("invalid value.");
208 value = std::move(val);
212 /** A variable bound to a CLI option
215 * static simgrid::config::Flag<int> answer("answer", "Expected answer", 42);
216 * static simgrid::config::Flag<std::string> name("name", "Ford Perfect", "John Doe");
217 * static simgrid::config::Flag<double> gamma("gamma", "Gamma factor", 1.987);
228 * @param name Flag name
229 * @param desc Flag description
230 * @param value Flag initial/default value
232 Flag(const char* name, const char* desc, xbt::type_identity_t<T> value) : value_(value), name_(name)
234 simgrid::config::bind_flag(value_, name, desc);
237 /** Constructor taking also an array of aliases for name */
238 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, xbt::type_identity_t<T> value)
239 : value_(value), name_(name)
241 simgrid::config::bind_flag(value_, name, aliases, desc);
244 /* A constructor accepting a callback that will be passed the parameter.
245 * It can either return a boolean (informing whether the parameter is valid), or returning void.
248 Flag(const char* name, const char* desc, xbt::type_identity_t<T> value, F callback) : value_(value), name_(name)
250 simgrid::config::bind_flag(value_, name, desc, std::move(callback));
254 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, xbt::type_identity_t<T> value,
256 : value_(value), name_(name)
258 simgrid::config::bind_flag(value_, name, aliases, desc, std::move(callback));
261 /* A constructor accepting a map of valid values -> their description,
262 * and producing an informative error message when an invalid value is passed, or when help is passed as a value.
265 Flag(const char* name, const char* desc, xbt::type_identity_t<T> value,
266 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
267 : value_(value), name_(name)
269 simgrid::config::bind_flag(value_, name, desc, valid_values, std::move(callback));
272 /* A constructor with everything */
274 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, xbt::type_identity_t<T> value,
275 const std::map<std::string, std::string, std::less<>>& valid_values, F callback)
276 : value_(value), name_(name)
278 simgrid::config::bind_flag(value_, name, aliases, desc, valid_values, std::move(callback));
282 Flag(Flag const&) = delete;
283 Flag& operator=(Flag const&) = delete;
285 // Get the underlying value:
286 T& get() { return value_; }
287 T const& get() const { return value_; }
289 const std::string& get_name() const { return name_; }
290 // Implicit conversion to the underlying type:
291 operator T&() { return value_; }
292 operator T const&() const{ return value_; }
294 // Basic interop with T:
296 Flag& operator=(U const& that) { value_ = that; return *this; }
298 Flag& operator=(U&& that) { value_ = std::forward<U>(that); return *this; }
300 bool operator==(U const& that) const { return value_ == that; }
302 bool operator!=(U const& that) const { return value_ != that; }
304 bool operator<(U const& that) const { return value_ < that; }
306 bool operator>(U const& that) const { return value_ > that; }
308 bool operator<=(U const& that) const { return value_ <= that; }
310 bool operator>=(U const& that) const { return value_ >= that; }
313 XBT_PUBLIC void finalize();
314 XBT_PUBLIC void show_aliases();
315 XBT_PUBLIC void help();
317 } // namespace config
318 } // namespace simgrid