+public:
+ virtual ~Target() { }
+
+ virtual const char *get_type() const = 0;
+ const std::string &get_name() const { return name; }
+ const Package *get_package() const { return package; }
+
+ /**
+ Tries to locate a target that will help getting this target built. If all
+ dependencies are up-to-date, returns this target. If there are no targets
+ ready to be built (maybe because they are being built right now), returns 0.
+ */
+ Target *get_buildable_target();
+
+ /**
+ If this target is a proxy for another (such as Install or Symlink), return
+ that target. Otherwise, return the target itself.
+
+ Implementors should call the function recursively to find the final target.
+ */
+ virtual Target *get_real_target() { return this; }
+
+ bool is_buildable() const { return buildable; }
+ bool get_rebuild() const { return rebuild; }
+ const std::string &get_rebuild_reason() const { return rebuild_reason; }
+ void add_depend(Target *);
+ const TargetList &get_depends() const { return depends; }
+ bool get_depends_ready() const { return deps_ready; }
+
+ /**
+ Finds dependencies for the target. When all dependencies have been found,
+ the function should set deps_ready to true.
+ */
+ virtual void find_depends() { deps_ready = true; }
+
+ /**
+ Prepares the target by recursively preparing dependencies, then checking
+ whether rebuilding is needed. A flag is used to prevent unnecessary
+ executions.
+ */
+ virtual void prepare();
+
+ /**
+ Starts building the target. Returns the Action used for building.
+ */
+ Action *build();
+protected: