From ddb18b9d0d200ecb7ef3d286a6d80d328f0ced7b Mon Sep 17 00:00:00 2001
From: q66 <daniel@octaforge.org>
Date: Thu, 25 Jun 2015 01:07:11 +0100
Subject: [PATCH] relax RangeHalf copy constructor a little (allow convertible
 range types)

---
 octa/range.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/octa/range.h b/octa/range.h
index 882e44e..a7a183c 100644
--- a/octa/range.h
+++ b/octa/range.h
@@ -247,8 +247,13 @@ public:
     using Range = T;
 
     RangeHalf(): p_range() {}
+
     RangeHalf(const T &range): p_range(range) {}
-    RangeHalf(const RangeHalf &half): p_range(half.p_range) {}
+
+    template<typename U> RangeHalf(const RangeHalf<U> &half,
+        octa::EnableIf<octa::IsConvertible<U, T>::value, bool> = true
+    ): p_range(half.p_range) {}
+
     RangeHalf(RangeHalf &&half): p_range(octa::move(half.p_range)) {}
 
     RangeHalf &operator=(const RangeHalf &half) {