Implement LWG#2790: Remove istreambuf_iterator::operator->. It never did anything useful.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@303675 91177308-0d34-0410-b5e6-96231b3b80d8

include/iterator

@@ -990,7 +990,6 @@ public:
 
     _LIBCPP_INLINE_VISIBILITY char_type  operator*() const
         {return static_cast<char_type>(__sbuf_->sgetc());}
-    _LIBCPP_INLINE_VISIBILITY char_type* operator->() const {return nullptr;}
     _LIBCPP_INLINE_VISIBILITY istreambuf_iterator& operator++()
         {
             __sbuf_->sbumpc();

test/std/iterators/stream.iterators/istreambuf.iterator/istreambuf.iterator_op_astrk/arrow.pass.cpp

@@ -1,28 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-// <iterator>
-
-// istreambuf_iterator
-
-// pointer operator->() const;
-
-#include <iostream>
-#include <sstream>
-#include <streambuf>
-
-typedef char C;
-int main ()
-{
-   std::istringstream s("filename");
-   std::istreambuf_iterator<char> i(s);
-
-   (*i).~C();  // This is well-formed...
-   i->~C();  // ... so this should be supported!
-}

www/cxx1z_status.html

@@ -444,7 +444,7 @@
 	<tr><td><a href="http://wg21.link/LWG2787">2787</a></td><td>&sect;[file_status.cons] doesn't match class definition</td><td>Kona</td><td>Complete</td></tr>
 	<tr><td><a href="http://wg21.link/LWG2788">2788</a></td><td>basic_string range mutators unintentionally require a default constructible allocator</td><td>Kona</td><td>Complete</td></tr>
 	<tr><td><a href="http://wg21.link/LWG2789">2789</a></td><td>Equivalence of contained objects</td><td>Kona</td><td>Complete</td></tr>
-	<tr><td><a href="http://wg21.link/LWG2790">2790</a></td><td>Missing specification of istreambuf_iterator::operator-&gt;</td><td>Kona</td><td></td></tr>
+	<tr><td><a href="http://wg21.link/LWG2790">2790</a></td><td>Missing specification of istreambuf_iterator::operator-&gt;</td><td>Kona</td><td>Complete</td></tr>
 	<tr><td><a href="http://wg21.link/LWG2794">2794</a></td><td>Missing requirements for allocator pointers</td><td>Kona</td><td></td></tr>
 	<tr><td><a href="http://wg21.link/LWG2795">2795</a></td><td>&sect;[global.functions] provides incorrect example of ADL use</td><td>Kona</td><td>Complete</td></tr>
 	<tr><td><a href="http://wg21.link/LWG2796">2796</a></td><td>tuple should be a literal type</td><td>Kona</td><td>Complete</td></tr>
@@ -489,7 +489,7 @@
 <!-- 	<tr><td></td><td></td><td></td><td></td></tr> -->
   </table>
 
-  <p>Last Updated: 11-May-2017</p>
+  <p>Last Updated: 23-May-2017</p>
 </div>
 </body>
 </html>