Hi,

tested x86_64-linux, committed to mainline.

Thanks,
Paolo.

/////////////////////
2011-09-09  Paolo Carlini  <paolo.carl...@oracle.com>

        PR libstdc++/50336
        * include/bits/streambuf_iterator.h (class istreambuf_iterator):
        Implement LWG 445 in C++0x mode.
        * testsuite/24_iterators/istreambuf_iterator/requirements/dr445.cc:
        New.
Index: include/bits/streambuf_iterator.h
===================================================================
--- include/bits/streambuf_iterator.h   (revision 178712)
+++ include/bits/streambuf_iterator.h   (working copy)
@@ -51,7 +51,13 @@
   template<typename _CharT, typename _Traits>
     class istreambuf_iterator
     : public iterator<input_iterator_tag, _CharT, typename _Traits::off_type,
-                     _CharT*, _CharT&>
+                      _CharT*,
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+    // LWG 445.
+                     _CharT>
+#else
+                     _CharT&>
+#endif
     {
     public:
       // Types:
Index: testsuite/24_iterators/istreambuf_iterator/requirements/dr445.cc
===================================================================
--- testsuite/24_iterators/istreambuf_iterator/requirements/dr445.cc    
(revision 0)
+++ testsuite/24_iterators/istreambuf_iterator/requirements/dr445.cc    
(revision 0)
@@ -0,0 +1,27 @@
+// { dg-options "-std=gnu++0x" }
+// { dg-do compile }
+
+// Copyright (C) 2011 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <type_traits>
+#include <iterator>
+
+using namespace std;
+
+// DR 445
+static_assert(is_same<istreambuf_iterator<char>::reference, char>::value, "");

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