From 41354f10f5940c72917eb4205ce5adad26f7a369 Mon Sep 17 00:00:00 2001
From: Joe Thornber <ejt@redhat.com>
Date: Thu, 4 Sep 2014 11:26:43 +0100
Subject: [PATCH] provide << operator for optionals

---
 thin-provisioning/human_readable_format.cc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/thin-provisioning/human_readable_format.cc b/thin-provisioning/human_readable_format.cc
index 0726aa9..3cfc188 100644
--- a/thin-provisioning/human_readable_format.cc
+++ b/thin-provisioning/human_readable_format.cc
@@ -26,6 +26,14 @@ using namespace thin_provisioning;
 //----------------------------------------------------------------
 
 namespace {
+	template <typename T>
+	std::ostream &operator << (ostream &out, boost::optional<T> const &maybe) {
+		if (maybe)
+			out << *maybe;
+
+		return out;
+	}
+
 	class hr_emitter : public emitter {
 	public:
 		hr_emitter(ostream &out)