event/{Idle,Defer}Event: use base_hook instead of member_hook

src/event/DeferEvent.hxx

@@ -31,12 +31,11 @@ class EventLoop;
  *
  * This class is thread-safe.
  */
-class DeferEvent final {
+class DeferEvent final
+	: public boost::intrusive::list_base_hook<>
+{
 	friend class EventLoop;
 
-	typedef boost::intrusive::list_member_hook<> ListHook;
-	ListHook list_hook;
-
 	EventLoop &loop;
 
 	typedef BoundMethod<void() noexcept> Callback;
@@ -59,7 +58,7 @@ public:
 
 private:
 	bool IsPending() const noexcept {
-		return list_hook.is_linked();
+		return is_linked();
 	}
 
 	void RunDeferred() noexcept {

src/event/IdleEvent.hxx

@@ -34,12 +34,11 @@ class EventLoop;
  * thread that runs the #EventLoop, except where explicitly documented
  * as thread-safe.
  */
-class IdleEvent {
+class IdleEvent
+	: public boost::intrusive::list_base_hook<>
+{
 	friend class EventLoop;
 
-	using ListHook = boost::intrusive::list_member_hook<>;
-	ListHook list_hook;
-
 	EventLoop &loop;
 
 	using Callback = BoundMethod<void() noexcept>;
@@ -63,7 +62,7 @@ public:
 	}
 
 	bool IsActive() const noexcept {
-		return list_hook.is_linked();
+		return is_linked();
 	}
 
 	void Schedule() noexcept;

src/event/Loop.hxx

@@ -72,9 +72,7 @@ class EventLoop final : SocketMonitor
 
 	using IdleList =
 		boost::intrusive::list<IdleEvent,
-				       boost::intrusive::member_hook<IdleEvent,
-								     IdleEvent::ListHook,
-								     &IdleEvent::list_hook>,
+				       boost::intrusive::base_hook<boost::intrusive::list_base_hook<>>,
 				       boost::intrusive::constant_time_size<false>>;
 	IdleList idle;
 
@@ -82,9 +80,7 @@ class EventLoop final : SocketMonitor
 
 	using DeferredList =
 		boost::intrusive::list<DeferEvent,
-				       boost::intrusive::member_hook<DeferEvent,
-								     DeferEvent::ListHook,
-								     &DeferEvent::list_hook>,
+				       boost::intrusive::base_hook<boost::intrusive::list_base_hook<>>,
 				       boost::intrusive::constant_time_size<false>>;
 	DeferredList deferred;