1 /* Copyright (c) 2016-2018. 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/config.h>
23 #include <xbt/sysdep.h>
28 template<class T> inline
29 std::string to_string(T&& value)
31 return std::to_string(std::forward<T>(value));
33 inline std::string const& to_string(std::string& value)
37 inline std::string const& to_string(std::string const& value)
41 inline std::string to_string(std::string&& value)
43 return std::move(value);
48 template <class T> XBT_PUBLIC void set_value(const char* name, T value);
50 extern template XBT_PUBLIC void set_value<int>(const char* name, int value);
51 extern template XBT_PUBLIC void set_value<double>(const char* name, double value);
52 extern template XBT_PUBLIC void set_value<bool>(const char* name, bool value);
53 extern template XBT_PUBLIC void set_value<std::string>(const char* name, std::string value);
57 template <class T> XBT_PUBLIC T const& get_value(const char* name);
59 extern template XBT_PUBLIC int const& get_value<int>(const char* name);
60 extern template XBT_PUBLIC double const& get_value<double>(const char* name);
61 extern template XBT_PUBLIC bool const& get_value<bool>(const char* name);
62 extern template XBT_PUBLIC std::string const& get_value<std::string>(const char* name);
66 /** Register a configuration flag
68 * @param name name of the option
69 * @param description Description of the option
70 * @param value Initial/default value
71 * @param callback called with the option value
74 XBT_PUBLIC void declare_flag(const char* name, const char* description, T value,
75 std::function<void(const T&)> callback = std::function<void(const T&)>());
77 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, int value,
78 std::function<void(int const&)> callback);
79 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, double value,
80 std::function<void(double const&)> callback);
81 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, bool value,
82 std::function<void(bool const&)> callback);
83 extern template XBT_PUBLIC void declare_flag(const char* name, const char* description, std::string value,
84 std::function<void(std::string const&)> callback);
88 XBT_PUBLIC void alias(const char* realname, std::initializer_list<const char*> aliases);
90 /** Bind a variable to configuration flag
92 * @param value Bound variable
93 * @param name Flag name
94 * @param description Option description
96 template <class T> void bind_flag(T& value, const char* name, const char* description)
98 declare_flag<T>(name, description, value, [&value](T const& val) { value = val; });
102 void bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description)
104 bind_flag(value, name, description);
105 alias(name, std::move(aliases));
108 /** Bind a variable to configuration flag
112 * simgrid::config::bind_flag(a, "x", [](int x) {
113 * if (x < x_min || x => x_max)
114 * throw std::range_error("must be in [x_min, x_max)")
118 // F is a checker, F : T& -> ()
119 template <class T, class F>
120 typename std::enable_if<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
121 bind_flag(T& value, const char* name, const char* description, F callback)
123 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
125 value = std::move(val);
129 template <class T, class F>
130 typename std::enable_if<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
131 bind_flag(T& value, const char* name, std::initializer_list<const char*> aliases, const char* description, F callback)
133 bind_flag(value, name, description, std::move(callback));
134 alias(name, std::move(aliases));
137 template <class T, class F>
138 typename std::enable_if<std::is_same<void, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
139 bind_flag(T& value, const char* name, const char* description, std::map<T, std::string> valid_values, F callback)
141 declare_flag(name, description, value,
142 std::function<void(const T&)>([&value, name, valid_values, callback](const T& val) {
145 for (auto kv : valid_values) {
149 if (not found || std::string(val) == "help") {
151 if (std::string(val) == "help")
152 mesg = std::string("\nPossible values for option ") + name + ":\n";
154 mesg = std::string("\nInvalid value '") + val + "' for option " + name + ". Possible values:\n";
155 for (auto kv : valid_values)
156 mesg += " - '" + std::string(kv.first) + "': " + kv.second +
157 (kv.first == value ? " <=== DEFAULT" : "") + "\n";
158 xbt_die("%s", mesg.c_str());
160 value = std::move(val);
163 /** Bind a variable to configuration flag
167 * simgrid::config::bind_flag(a, "x", [](int x) { return x > 0; });
170 // F is a predicate, F : T const& -> bool
171 template <class T, class F>
172 typename std::enable_if<std::is_same<bool, decltype(std::declval<F>()(std::declval<const T&>()))>::value, void>::type
173 bind_flag(T& value, const char* name, const char* description, F callback)
175 declare_flag(name, description, value, std::function<void(const T&)>([&value, callback](const T& val) {
176 if (not callback(val))
177 throw std::range_error("invalid value.");
178 value = std::move(val);
182 /** A variable bound to a CLI option
185 * static simgrid::config::flag<int> answer("answer", "Expected answer", 42);
186 * static simgrid::config::flag<std::string> name("name", "Ford Perfect", "John Doe");
187 * static simgrid::config::flag<double> gamma("gamma", "Gamma factor", 1.987);
197 * @param name Flag name
198 * @param desc Flag description
199 * @param value Flag initial/default value
201 Flag(const char* name, const char* desc, T value) : value_(value)
203 simgrid::config::bind_flag(value_, name, desc);
206 /** Constructor taking also an array of aliases for name */
207 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, T value) : value_(value)
209 simgrid::config::bind_flag(value_, name, std::move(aliases), desc);
212 /* A constructor accepting a callback that will be passed the parameter.
213 * It can either return a boolean (informing whether the parameter is valid), or returning void.
216 Flag(const char* name, const char* desc, T value, F callback) : value_(value)
218 simgrid::config::bind_flag(value_, name, desc, std::move(callback));
222 Flag(const char* name, std::initializer_list<const char*> aliases, const char* desc, T value, F callback)
225 simgrid::config::bind_flag(value_, name, std::move(aliases), desc, std::move(callback));
228 /* A constructor accepting a map of valid values -> their description,
229 * and producing an informative error message when an invalid value is passed, or when help is passed as a value.
232 Flag(const char* name, const char* desc, T value, std::map<T, std::string> valid_values, F callback) : value_(value)
234 simgrid::config::bind_flag(value_, name, desc, std::move(valid_values), std::move(callback));
238 Flag(Flag const&) = delete;
239 Flag& operator=(Flag const&) = delete;
241 // Get the underlying value:
242 T& get() { return value_; }
243 T const& get() const { return value_; }
245 // Implicit conversion to the underlying type:
246 operator T&() { return value_; }
247 operator T const&() const{ return value_; }
249 // Basic interop with T:
251 Flag& operator=(U const& that) { value_ = that; return *this; }
253 Flag& operator=(U && that) { value_ = that; return *this; }
255 bool operator==(U const& that) const { return value_ == that; }
257 bool operator!=(U const& that) const { return value_ != that; }
259 bool operator<(U const& that) const { return value_ < that; }
261 bool operator>(U const& that) const { return value_ > that; }
263 bool operator<=(U const& that) const { return value_ <= that; }
265 bool operator>=(U const& that) const { return value_ >= that; }
270 XBT_ATTRIB_DEPRECATED_v323("Please use simgrid::config::get_value<std::string>") XBT_PUBLIC std::string
271 xbt_cfg_get_string(const char* name);