re PR libstdc++/50336 (LWG issue 445)

2011-09-09  Paolo Carlini  <paolo.carlini@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.

From-SVN: r178713

libstdc++-v3/ChangeLog

+2011-09-09  Paolo Carlini  <paolo.carlini@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.
+
 2011-09-08  Dodji Seketeli  <dodji@redhat.com>
 
 	PR c++/33255 - Support -Wunused-local-typedefs warning

libstdc++-v3/include/bits/streambuf_iterator.h

@@ -51,7 +51,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   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:

libstdc++-v3/testsuite/24_iterators/istreambuf_iterator/requirements/dr445.cc

+// { 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, "");