From dafd5a17b521631a055e95bb5e074ccc0d01d63a Mon Sep 17 00:00:00 2001
From: q66 <daniel@octaforge.org>
Date: Wed, 17 Jun 2015 00:44:41 +0100
Subject: [PATCH] loosen up PointerRange ctor rules (allow construction of
 PointerRange<T> from any PointerRange<U> where U * is convertible to T *)

---
 octa/range.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/octa/range.h b/octa/range.h
index 43d854c..5b8cacf 100644
--- a/octa/range.h
+++ b/octa/range.h
@@ -746,11 +746,14 @@ template<typename T>
 struct PointerRange: InputRange<PointerRange<T>, FiniteRandomAccessRangeTag, T> {
 
     PointerRange(): p_beg(nullptr), p_end(nullptr) {}
-    PointerRange(const PointerRange &v): p_beg(v.p_beg),
-        p_end(v.p_end) {}
     PointerRange(T *beg, T *end): p_beg(beg), p_end(end) {}
     PointerRange(T *beg, octa::Size n): p_beg(beg), p_end(beg + n) {}
 
+    template<typename U>
+    PointerRange(const PointerRange<U> &v, octa::EnableIf<
+        octa::IsConvertible<U *, T *>::value, bool
+    > = true): p_beg(&v[0]), p_end(&v[v.size()]) {}
+
     PointerRange &operator=(const PointerRange &v) {
         p_beg = v.p_beg;
         p_end = v.p_end;