+#ifndef DOXYGEN
+ friend std::vector<ActivityPtr> create_DAG_from_dot(const std::string& filename);
+ friend std::vector<ActivityPtr> create_DAG_from_DAX(const std::string& filename);
+#endif
+
+public:
+ // enum class State { ... }
+ XBT_DECLARE_ENUM_CLASS(State, INITED, STARTING, STARTED, FAILED, CANCELED, FINISHED);
+
+ virtual bool is_assigned() const = 0;
+ bool dependencies_solved() const { return dependencies_.empty(); }
+ unsigned long is_waited_by() const { return successors_.size(); }
+ const std::set<ActivityPtr>& get_dependencies() const { return dependencies_; }
+ const std::vector<ActivityPtr>& get_successors() const { return successors_; }