ostream operator << for range template.

thin-provisioning/range.h

@@ -2,6 +2,7 @@
 #define THIN_RANGE_H
 
 #include <boost/optional.hpp>
+#include <ostream>
 
 //----------------------------------------------------------------
 
@@ -23,6 +24,24 @@ namespace thin_provisioning {
 		maybe begin_;
 		maybe end_;
 	};
+
+	template <typename T>
+	std::ostream &
+	operator <<(std::ostream &out, range<T> const &r) {
+		if (r.begin_)
+			out << "[" << *r.begin_;
+		else
+			out << "[-";
+
+		out << ", ";
+
+		if (r.end_)
+			out << *r.end_ << "]";
+		else
+			out << "-]";
+
+		return out;
+	}
 }
 
 //----------------------------------------------------------------