+
+inline ConfigurationElement* Config::get_dict_element(const char* name)
+{
+ auto opt = options.find(name);
+ if (opt != options.end()) {
+ return opt->second;
+ } else {
+ auto als = aliases.find(name);
+ if (als != aliases.end()) {
+ ConfigurationElement* res = als->second;
+ if (warn_for_aliases)
+ XBT_INFO("Option %s has been renamed to %s. Consider switching.", name, res->get_key().c_str());
+ return res;
+ } else {
+ THROWF(not_found_error, 0, "Bad config key: %s", name);
+ }
+ }
+}
+
+inline ConfigurationElement& Config::operator[](const char* name)
+{
+ return *(get_dict_element(name));
+}
+
+void Config::alias(const char* realname, const char* aliasname)
+{
+ xbt_assert(aliases.find(aliasname) == aliases.end(), "Alias '%s' already.", aliasname);
+ ConfigurationElement* element = this->get_dict_element(realname);
+ xbt_assert(element, "Cannot define an alias to the non-existing option '%s'.", realname);
+ this->aliases.insert({aliasname, element});
+}
+
+/** @brief Dump a config set for debuging purpose
+ *
+ * @param name The name to give to this config set
+ * @param indent what to write at the beginning of each line (right number of spaces)
+ */
+void Config::dump(const char *name, const char *indent)
+{
+ if (name)
+ printf("%s>> Dumping of the config set '%s':\n", indent, name);
+
+ for (auto const& elm : options)
+ printf("%s %s: ()%s) %s", indent, elm.first.c_str(), elm.second->get_type_name(),
+ elm.second->get_string_value().c_str());
+
+ if (name)
+ printf("%s<< End of the config set '%s'\n", indent, name);
+ fflush(stdout);
+}
+
+/** @brief Displays the declared aliases and their replacement */
+void Config::show_aliases()
+{
+ for (auto const& elm : aliases)
+ printf(" %-40s %s\n", elm.first.c_str(), elm.second->get_key().c_str());
+}
+
+/** @brief Displays the declared options and their description */
+void Config::help()
+{
+ for (auto const& elm : options) {
+ simgrid::config::ConfigurationElement* variable = this->options.at(elm.first);
+ printf(" %s: %s\n", elm.first.c_str(), variable->get_description().c_str());
+ printf(" Type: %s; ", variable->get_type_name());
+ printf("Current value: %s\n", variable->get_string_value().c_str());
+ }
+}
+
+// ***** get_config *****
+
+template <class T> XBT_PUBLIC T const& get_config(const char* name)
+{
+ return (*simgrid_config)[name].get_value<T>();
+}
+
+template XBT_PUBLIC int const& get_config<int>(const char* name);
+template XBT_PUBLIC double const& get_config<double>(const char* name);
+template XBT_PUBLIC bool const& get_config<bool>(const char* name);
+template XBT_PUBLIC std::string const& get_config<std::string>(const char* name);
+
+// ***** alias *****
+
+void alias(const char* realname, std::initializer_list<const char*> aliases)
+{
+ for (auto const& aliasname : aliases)
+ simgrid_config->alias(realname, aliasname);
+}
+
+// ***** declare_flag *****
+
+template <class T>
+XBT_PUBLIC void declare_flag(const char* name, const char* description, T value, std::function<void(const T&)> callback)
+{
+ if (simgrid_config == nullptr)
+ simgrid_config = xbt_cfg_new();
+ simgrid_config->register_option<T>(name, description, std::move(value), std::move(callback));
+}
+
+template XBT_PUBLIC void declare_flag(const char* name, const char* description, int value,
+ std::function<void(int const&)> callback);
+template XBT_PUBLIC void declare_flag(const char* name, const char* description, double value,
+ std::function<void(double const&)> callback);
+template XBT_PUBLIC void declare_flag(const char* name, const char* description, bool value,
+ std::function<void(bool const&)> callback);
+template XBT_PUBLIC void declare_flag(const char* name, const char* description, std::string value,
+ std::function<void(std::string const&)> callback);
+}
+}
+
+// ***** C bindings *****
+
+xbt_cfg_t xbt_cfg_new()
+{
+ return new simgrid::config::Config();
+}
+void xbt_cfg_free(xbt_cfg_t * cfg) { delete *cfg; }
+
+void xbt_cfg_dump(const char *name, const char *indent, xbt_cfg_t cfg)
+{
+ cfg->dump(name, indent);
+}
+
+/*----[ Registering stuff ]-----------------------------------------------*/
+
+void xbt_cfg_register_double(const char *name, double default_value,
+ xbt_cfg_cb_t cb_set, const char *desc)
+{
+ if (simgrid_config == nullptr)
+ simgrid_config = xbt_cfg_new();
+ simgrid_config->register_option<double>(name, desc, default_value, cb_set);
+}
+
+void xbt_cfg_register_int(const char *name, int default_value,xbt_cfg_cb_t cb_set, const char *desc)
+{
+ if (simgrid_config == nullptr)
+ simgrid_config = xbt_cfg_new();
+ simgrid_config->register_option<int>(name, desc, default_value, cb_set);
+}
+
+void xbt_cfg_register_string(const char *name, const char *default_value, xbt_cfg_cb_t cb_set, const char *desc)
+{
+ if (simgrid_config == nullptr)
+ simgrid_config = xbt_cfg_new();
+ simgrid_config->register_option<std::string>(name, desc, default_value ? default_value : "", cb_set);
+}
+
+void xbt_cfg_register_boolean(const char *name, const char*default_value,xbt_cfg_cb_t cb_set, const char *desc)
+{
+ if (simgrid_config == nullptr)
+ simgrid_config = xbt_cfg_new();
+ simgrid_config->register_option<bool>(name, desc, simgrid::config::parse_bool(default_value), cb_set);
+}
+
+void xbt_cfg_register_alias(const char *realname, const char *aliasname)
+{
+ if (simgrid_config == nullptr)
+ simgrid_config = xbt_cfg_new();
+ simgrid_config->alias(realname, aliasname);
+}
+
+void xbt_cfg_aliases()
+{
+ simgrid_config->show_aliases();
+}
+void xbt_cfg_help()
+{
+ simgrid_config->help();
+}
+
+/*----[ Setting ]---------------------------------------------------------*/
+
+/** @brief Add values parsed from a string into a config set
+ *
+ * @param options a string containing the content to add to the config set. This is a '\\t',' ' or '\\n' or ','
+ * separated list of variables. Each individual variable is like "[name]:[value]" where [name] is the name of an
+ * already registered variable, and [value] conforms to the data type under which this variable was registered.
+ *
+ * @todo This is a crude manual parser, it should be a proper lexer.
+ */
+void xbt_cfg_set_parse(const char *options)
+{
+ if (not options || not strlen(options)) { /* nothing to do */
+ return;
+ }
+
+ XBT_DEBUG("List to parse and set:'%s'", options);
+ std::string optionlist(options);
+ while (not optionlist.empty()) {
+ XBT_DEBUG("Still to parse and set: '%s'", optionlist.c_str());
+
+ // skip separators
+ size_t pos = optionlist.find_first_not_of(" \t\n,");
+ optionlist.erase(0, pos);
+ // find option
+ pos = optionlist.find_first_of(" \t\n,");
+ std::string name = optionlist.substr(0, pos);
+ optionlist.erase(0, pos);
+ XBT_DEBUG("parse now:'%s'; parse later:'%s'", name.c_str(), optionlist.c_str());
+
+ if (name.empty())
+ continue;
+
+ pos = name.find(':');
+ xbt_assert(pos != std::string::npos, "Option '%s' badly formatted. Should be of the form 'name:value'",
+ name.c_str());
+
+ std::string val = name.substr(pos + 1);
+ name.erase(pos);
+
+ const std::string path("path");
+ if (name.compare(0, path.length(), path) != 0)
+ XBT_INFO("Configuration change: Set '%s' to '%s'", name.c_str(), val.c_str());
+
+ (*simgrid_config)[name.c_str()].set_string_value(val.c_str());
+ }
+}
+
+/** @brief Set the value of a variable, using the string representation of that value
+ *
+ * @param key name of the variable to modify
+ * @param value string representation of the value to set
+ */
+
+void xbt_cfg_set_as_string(const char *key, const char *value)
+{
+ (*simgrid_config)[key].set_string_value(value);
+}
+
+/** @brief Set an integer value to \a name within \a cfg if it wasn't changed yet
+ *
+ * This is useful to change the default value of a variable while allowing
+ * users to override it with command line arguments
+ */
+void xbt_cfg_setdefault_int(const char *key, int value)
+{
+ (*simgrid_config)[key].set_default_value<int>(value);
+}
+
+/** @brief Set an integer value to \a name within \a cfg if it wasn't changed yet
+ *
+ * This is useful to change the default value of a variable while allowing
+ * users to override it with command line arguments
+ */
+void xbt_cfg_setdefault_double(const char *key, double value)
+{
+ (*simgrid_config)[key].set_default_value<double>(value);
+}
+
+/** @brief Set a string value to \a name within \a cfg if it wasn't changed yet
+ *
+ * This is useful to change the default value of a variable while allowing
+ * users to override it with command line arguments
+ */
+void xbt_cfg_setdefault_string(const char *key, const char *value)
+{
+ (*simgrid_config)[key].set_default_value<std::string>(value ? value : "");
+}
+
+/** @brief Set an boolean value to \a name within \a cfg if it wasn't changed yet
+ *
+ * This is useful to change the default value of a variable while allowing
+ * users to override it with command line arguments
+ */
+void xbt_cfg_setdefault_boolean(const char *key, const char *value)
+{
+ (*simgrid_config)[key].set_default_value<bool>(simgrid::config::parse_bool(value));
+}
+
+/** @brief Set an integer value to \a name within \a cfg
+ *
+ * @param key the name of the variable
+ * @param value the value of the variable
+ */
+void xbt_cfg_set_int(const char *key, int value)
+{
+ (*simgrid_config)[key].set_value<int>(value);
+}
+
+/** @brief Set or add a double value to \a name within \a cfg
+ *
+ * @param key the name of the variable
+ * @param value the double to set
+ */
+void xbt_cfg_set_double(const char *key, double value)
+{
+ (*simgrid_config)[key].set_value<double>(value);
+}
+
+/** @brief Set or add a string value to \a name within \a cfg
+ *
+ * @param key the name of the variable
+ * @param value the value to be added
+ *
+ */
+void xbt_cfg_set_string(const char* key, const char* value)
+{
+ (*simgrid_config)[key].set_value<std::string>(value);
+}
+
+/** @brief Set or add a boolean value to \a name within \a cfg
+ *
+ * @param key the name of the variable
+ * @param value the value of the variable
+ */
+void xbt_cfg_set_boolean(const char *key, const char *value)
+{
+ (*simgrid_config)[key].set_value<bool>(simgrid::config::parse_bool(value));
+}
+
+
+/* Say if the value is the default value */
+int xbt_cfg_is_default_value(const char *key)
+{
+ return (*simgrid_config)[key].is_default() ? 1 : 0;
+}
+
+/*----[ Getting ]---------------------------------------------------------*/
+/** @brief Retrieve an integer value of a variable (get a warning if not uniq)
+ *
+ * @param key the name of the variable
+ *
+ * Returns the first value from the config set under the given name.
+ */
+int xbt_cfg_get_int(const char *key)
+{
+ return (*simgrid_config)[key].get_value<int>();
+}
+
+/** @brief Retrieve a double value of a variable (get a warning if not uniq)
+ *
+ * @param key the name of the variable
+ *
+ * Returns the first value from the config set under the given name.
+ */
+double xbt_cfg_get_double(const char *key)
+{
+ return (*simgrid_config)[key].get_value<double>();
+}
+
+/** @brief Retrieve a string value of a variable (get a warning if not uniq)
+ *
+ * @param key the name of the variable
+ *
+ * Returns the first value from the config set under the given name.
+ * If there is more than one value, it will issue a warning.
+ * Returns nullptr if there is no value.
+ *
+ * \warning the returned value is the actual content of the config set
+ */
+std::string xbt_cfg_get_string(const char* key)
+{
+ return (*simgrid_config)[key].get_value<std::string>();
+}
+
+/** @brief Retrieve a boolean value of a variable (get a warning if not uniq)
+ *
+ * @param key the name of the variable
+ *
+ * Returns the first value from the config set under the given name.
+ * If there is more than one value, it will issue a warning.
+ */
+int xbt_cfg_get_boolean(const char *key)
+{
+ return (*simgrid_config)[key].get_value<bool>() ? 1 : 0;
+}
+
+#ifdef SIMGRID_TEST
+
+#include <string>
+
+#include "xbt.h"
+#include "xbt/ex.h"
+#include <xbt/ex.hpp>
+
+#include <xbt/config.hpp>
+
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(xbt_cfg);
+
+XBT_TEST_SUITE("config", "Configuration support");
+
+XBT_PUBLIC_DATA xbt_cfg_t simgrid_config;
+
+static void make_set()
+{
+ simgrid_config = nullptr;
+ xbt_log_threshold_set(&_XBT_LOGV(xbt_cfg), xbt_log_priority_critical);
+ simgrid::config::declare_flag<int>("speed", "description", 0);
+ simgrid::config::declare_flag<std::string>("peername", "description", "");
+ simgrid::config::declare_flag<std::string>("user", "description", "");
+} /* end_of_make_set */
+
+XBT_TEST_UNIT("memuse", test_config_memuse, "Alloc and free a config set")
+{
+ auto temp = simgrid_config;
+ make_set();
+ xbt_test_add("Alloc and free a config set");
+ xbt_cfg_set_parse("peername:veloce user:bidule");
+ xbt_cfg_free(&simgrid_config);
+ simgrid_config = temp;
+}
+
+XBT_TEST_UNIT("use", test_config_use, "Data retrieving tests")
+{
+ auto temp = simgrid_config;
+ make_set();
+ xbt_test_add("Get a single value");
+ {
+ /* get_single_value */
+ xbt_cfg_set_parse("peername:toto:42 speed:42");
+ int ival = simgrid::config::get_config<int>("speed");
+ if (ival != 42)
+ xbt_test_fail("Speed value = %d, I expected 42", ival);
+ }
+
+ xbt_test_add("Access to a non-existant entry");
+ {
+ try {
+ xbt_cfg_set_parse("color:blue");
+ } catch(xbt_ex& e) {
+ if (e.category != not_found_error)
+ xbt_test_exception(e);
+ }
+ }
+ xbt_cfg_free(&simgrid_config);
+ simgrid_config = temp;
+}
+
+XBT_TEST_UNIT("c++flags", test_config_cxx_flags, "C++ flags")
+{
+ auto temp = simgrid_config;
+ make_set();
+ xbt_test_add("C++ declaration of flags");
+
+ simgrid::config::Flag<int> int_flag("int", "", 0);
+ simgrid::config::Flag<std::string> string_flag("string", "", "foo");
+ simgrid::config::Flag<double> double_flag("double", "", 0.32);
+ simgrid::config::Flag<bool> bool_flag1("bool1", "", false);
+ simgrid::config::Flag<bool> bool_flag2("bool2", "", true);
+
+ xbt_test_add("Parse values");
+ xbt_cfg_set_parse("int:42 string:bar double:8.0 bool1:true bool2:false");
+ xbt_test_assert(int_flag == 42, "Check int flag");
+ xbt_test_assert(string_flag == "bar", "Check string flag");
+ xbt_test_assert(double_flag == 8.0, "Check double flag");
+ xbt_test_assert(bool_flag1, "Check bool1 flag");
+ xbt_test_assert(not bool_flag2, "Check bool2 flag");
+
+ xbt_cfg_free(&simgrid_config);
+ simgrid_config = temp;
+}
+
+#endif /* SIMGRID_TEST */