Add a range class

thin-provisioning/range.h

@@ -0,0 +1,26 @@
+#ifndef THIN_RANGE_H
+#define THIN_RANGE_H
+
+#include <boost/optional.hpp>
+
+//----------------------------------------------------------------
+
+namespace thin_provisioning {
+	template <typename T>
+	class range {
+	public:
+		typedef boost::optional<T> maybe;
+
+		range(maybe begin = maybe(), maybe end = maybe())
+			: begin_(begin),
+			  end_(end) {
+		}
+
+		maybe begin_;
+		maybe end_;
+	};
+}
+
+//----------------------------------------------------------------
+
+#endif