From 48aec0f093ff6494a3e4f7cd5166cb4a27c16814 Mon Sep 17 00:00:00 2001
From: Johann Klähn <kljohann@gmail.com>
Date: Sun, 10 May 2015 12:45:28 +0200
Subject: boost::none_t no longer convertible from literal 0 in 1.58

Instead we use boost::none, which has been documented since boost 1.34.0.
---
 src/times.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

(limited to 'src/times.h')

diff --git a/src/times.h b/src/times.h
index 421d1462..cc980858 100644
--- a/src/times.h
+++ b/src/times.h
@@ -500,11 +500,7 @@ public:
   void   stabilize(const optional<date_t>& date = none);
 
   bool   is_valid() const {
-#if BOOST_VERSION >= 105600
-    return start != NULL;
-#else
-    return start;
-#endif
+    return start != boost::none;
   }
 
   /** Find the current or next period containing date.  Returns false if
-- 
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