From 87b998c9ee3fdb442ee68d201ca897c28d99884a Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Sat, 12 May 2012 22:40:34 -0700
Subject: [PATCH] Use polymorphic downcast.

---
 src/LedgerAcquire.cpp | 11 +++++------
 src/LedgerAcquire.h   | 10 +++++++---
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/LedgerAcquire.cpp b/src/LedgerAcquire.cpp
index ee8fcb7a2..d48212906 100644
--- a/src/LedgerAcquire.cpp
+++ b/src/LedgerAcquire.cpp
@@ -56,13 +56,13 @@ void PeerSet::badPeer(Peer::pointer ptr)
 void PeerSet::resetTimer()
 {
 	mTimer.expires_from_now(boost::posix_time::seconds(mTimerInterval));
-	mTimer.async_wait(getTimerLamba());
+	mTimer.async_wait(boost::bind(&PeerSet::TimerEntry, pmDowncast(), boost::asio::placeholders::error));
 }
 
-void LedgerAcquire::LATimerEntry(boost::weak_ptr<LedgerAcquire> wptr, const boost::system::error_code& result)
+void PeerSet::TimerEntry(boost::weak_ptr<PeerSet> wptr, const boost::system::error_code& result)
 {
 	if (result == boost::asio::error::operation_aborted) return;
-	boost::shared_ptr<LedgerAcquire> ptr = wptr.lock();
+	boost::shared_ptr<PeerSet> ptr = wptr.lock();
 	if (!!ptr) ptr->onTimer();
 }
 
@@ -74,10 +74,9 @@ LedgerAcquire::LedgerAcquire(const uint256& hash) : PeerSet(hash, LEDGER_ACQUIRE
 #endif
 }
 
-boost::function<void (boost::system::error_code)> LedgerAcquire::getTimerLamba()
+boost::weak_ptr<PeerSet> LedgerAcquire::pmDowncast()
 {
-	return boost::bind(&LedgerAcquire::LATimerEntry, boost::weak_ptr<LedgerAcquire>(shared_from_this()),
-		boost::asio::placeholders::error);
+	return boost::shared_polymorphic_downcast<PeerSet, LedgerAcquire>(shared_from_this());
 }
 
 void LedgerAcquire::done()
diff --git a/src/LedgerAcquire.h b/src/LedgerAcquire.h
index 8d75ea7d3..3fb7c0c5a 100644
--- a/src/LedgerAcquire.h
+++ b/src/LedgerAcquire.h
@@ -37,10 +37,14 @@ public:
 
 protected:
 	virtual void newPeer(Peer::pointer) = 0;
-	virtual boost::function<void (boost::system::error_code)> getTimerLamba() = 0;
+	virtual void onTimer(void) = 0;
+	virtual boost::weak_ptr<PeerSet> pmDowncast() = 0;
 
 	void setComplete()					{ mComplete = true; }
 	void setFailed()					{ mFailed = true; }
+
+private:
+	static void TimerEntry(boost::weak_ptr<PeerSet>, const boost::system::error_code& result);
 };
 
 class LedgerAcquire : public PeerSet, public boost::enable_shared_from_this<LedgerAcquire>
@@ -61,8 +65,8 @@ protected:
 	void sendRequest(boost::shared_ptr<newcoin::TMGetLedger> message, Peer::pointer peer);
 	void newPeer(Peer::pointer peer) { trigger(peer); }
 	void trigger(Peer::pointer);
-	virtual boost::function<void (boost::system::error_code)> getTimerLamba();
-	static void LATimerEntry(boost::weak_ptr<LedgerAcquire>, const boost::system::error_code&);
+
+	boost::weak_ptr<PeerSet> pmDowncast();
 
 public:
 	LedgerAcquire(const uint256& hash);