From 11a41c4cf444d2b08d5a0874c67ee72640527baa Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Wed, 13 Mar 2013 12:58:05 +0000
Subject: [PATCH] Pull ref_counter out of btree.h

---
 persistent-data/data-structures/btree.h       |  8 +---
 persistent-data/data-structures/ref_counter.h | 43 +++++++++++++++++++
 2 files changed, 44 insertions(+), 7 deletions(-)
 create mode 100644 persistent-data/data-structures/ref_counter.h

diff --git a/persistent-data/data-structures/btree.h b/persistent-data/data-structures/btree.h
index c065660..62cec9d 100644
--- a/persistent-data/data-structures/btree.h
+++ b/persistent-data/data-structures/btree.h
@@ -21,6 +21,7 @@
 
 #include "persistent-data/endian_utils.h"
 #include "persistent-data/transaction_manager.h"
+#include "persistent-data/data-structures/ref_counter.h"
 
 #include <boost/noncopyable.hpp>
 #include <boost/optional.hpp>
@@ -29,13 +30,6 @@
 //----------------------------------------------------------------
 
 namespace persistent_data {
-	template <typename ValueType>
-	class no_op_ref_counter {
-	public:
-		void inc(ValueType const &v) {}
-		void dec(ValueType const &v) {}
-	};
-
 	struct uint64_traits {
 		typedef base::__le64 disk_type;
 		typedef uint64_t value_type;
diff --git a/persistent-data/data-structures/ref_counter.h b/persistent-data/data-structures/ref_counter.h
new file mode 100644
index 0000000..f4ef791
--- /dev/null
+++ b/persistent-data/data-structures/ref_counter.h
@@ -0,0 +1,43 @@
+// Copyright (C) 2013 Red Hat, Inc. All rights reserved.
+//
+// This file is part of the thin-provisioning-tools source.
+//
+// thin-provisioning-tools is free software: you can redistribute it
+// and/or modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// thin-provisioning-tools is distributed in the hope that it will be
+// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with thin-provisioning-tools.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+#ifndef REF_COUNTER_H
+#define REF_COUNTER_H
+
+//----------------------------------------------------------------
+
+namespace persistent_data {
+	template <typename ValueType>
+	class ref_counter {
+	public:
+		boost::shared_ptr<ref_counter<ValueType> > ptr;
+
+		virtual ~ref_counter() {}
+		virtual void set(ValueType const &v, uint32_t rc) {}
+		virtual void inc(ValueType const &v) {}
+		virtual void dec(ValueType const &v) {}
+	};
+
+	template <typename ValueType>
+	class no_op_ref_counter : public ref_counter<ValueType> {
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif