From a38e80eb6ba8d3c20b4d34bf8d07992888e5336c Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Thu, 30 May 2013 13:44:18 -0700
Subject: [PATCH] Function to get list of features supported by ledger.

---
 src/cpp/ripple/Ledger.cpp | 12 ++++++++++++
 src/cpp/ripple/Ledger.h   |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/src/cpp/ripple/Ledger.cpp b/src/cpp/ripple/Ledger.cpp
index 227f350eb..da9b4e105 100644
--- a/src/cpp/ripple/Ledger.cpp
+++ b/src/cpp/ripple/Ledger.cpp
@@ -1327,6 +1327,18 @@ std::vector< std::pair<uint32, uint256> > Ledger::getLedgerHashes()
 	return ret;
 }
 
+boost::unordered_set<uint256> Ledger::getLedgerFeatures()
+{
+	boost::unordered_set<uint256> usFeatures;
+	SLE::pointer sleFeatures = getSLEi(getLedgerFeatureIndex());
+	if (sleFeatures)
+	{
+		BOOST_FOREACH(const uint256& uFeature, sleFeatures->getFieldV256(sfFeatures).peekValue())
+			usFeatures.insert(uFeature);
+	}
+	return usFeatures;
+}
+
 // XRP to XRP not allowed.
 // Currencies must have appropriate issuer.
 // Currencies or accounts must differ.
diff --git a/src/cpp/ripple/Ledger.h b/src/cpp/ripple/Ledger.h
index b7e3cf524..3ad00ca8c 100644
--- a/src/cpp/ripple/Ledger.h
+++ b/src/cpp/ripple/Ledger.h
@@ -5,6 +5,7 @@
 #include <list>
 
 #include <boost/shared_ptr.hpp>
+#include <boost/unordered_set.hpp>
 #include <boost/enable_shared_from_this.hpp>
 #include <boost/date_time/posix_time/posix_time.hpp>
 
@@ -219,6 +220,7 @@ public:
 
 	static uint256 getLedgerFeatureIndex();
 	static uint256 getLedgerFeeIndex();
+	boost::unordered_set<uint256> getLedgerFeatures();
 
 	std::vector<uint256> getNeededTransactionHashes(int max, SHAMapSyncFilter* filter);
 	std::vector<uint256> getNeededAccountStateHashes(int max, SHAMapSyncFilter* filter);