+ /**
+ * Set the handler to be called when the installation successfully
+ * completes.
+ *
+ * @note If the installation is already complete, the handler is called
+ * immediately.
+ */
+ Install* done(const Callback& cb);
+
+ template<class C>
+ Install* done(C* instance, void (C::*mem_func)(Install*))
+ {
+ return done(boost::bind(mem_func, instance, _1));
+ }
+
+ /**
+ * Set the handler to be called when the installation fails or is aborted.
+ *
+ * @note If the installation has already failed, the handler is called
+ * immediately.
+ */
+ Install* fail(const Callback& cb);
+
+ template<class C>
+ Install* fail(C* instance, void (C::*mem_func)(Install*))
+ {
+ return fail(boost::bind(mem_func, instance, _1));
+ }
+
+ /**
+ * Set the handler to be called when the installation either successfully
+ * completes or fails.
+ *
+ * @note If the installation is already complete or has already failed, the
+ * handler is called immediately.
+ */
+ Install* always(const Callback& cb);
+
+ template<class C>
+ Install* always(C* instance, void (C::*mem_func)(Install*))
+ {
+ return always(boost::bind(mem_func, instance, _1));
+ }