[libc++] Const qualify __gnu_cxx::hash_map<>::const_iterator::pointer type.

Differential Revision: http://llvm-reviews.chandlerc.com/D2811

llvm-svn: 202749

libcxx/include/ext/hash_map

@@ -430,9 +430,9 @@ public:
     typedef const value_type&                                    reference;
     typedef typename __pointer_traits::template
 #ifndef _LIBCPP_HAS_NO_TEMPLATE_ALIASES
-            rebind<value_type>
+            rebind<const value_type>
 #else
-            rebind<value_type>::other
+            rebind<const value_type>::other
 #endif
                                                                  pointer;
 

libcxx/test/extensions/hash_map/const_iterator.fail.cpp

@@ -0,0 +1,18 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+#include <ext/hash_map>
+
+int main()
+{
+    __gnu_cxx::hash_map<int, int> m;
+    m[1] = 1;
+    const __gnu_cxx::hash_map<int, int> &cm = m;
+    cm.find(1)->second = 2;  // error
+}