- ConfigurationElement(const char* key, const char* desc) : key(key ? key : ""), desc(desc ? desc : "") {}
- ConfigurationElement(const char* key, const char* desc, xbt_cfg_cb_t cb)
- : key(key ? key : ""), desc(desc ? desc : ""), old_callback(cb) {}
+ ConfigurationElement(std::string key, std::string desc) : key(key), desc(desc) {}
+ ConfigurationElement(std::string key, std::string desc, xbt_cfg_cb_t cb) : key(key), desc(desc), old_callback(cb) {}