hashtable.cc (__access_protected_ctor): Define and use new type instead of _Hashtable_ebo_helper.

	* include/bits/hashtable.cc (__access_protected_ctor): Define and use
	new type instead of _Hashtable_ebo_helper.
	* testsuite/23_containers/unordered_set/
	not_default_constructible_hash_neg.cc: Adjust line number.

From-SVN: r204182

libstdc++-v3/ChangeLog

+2013-10-29  Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	* include/bits/hashtable.cc (__access_protected_ctor): Define and use
+	new type instead of _Hashtable_ebo_helper.
+	* testsuite/23_containers/unordered_set/
+	not_default_constructible_hash_neg.cc: Adjust line number.
+
 2013-10-28  Tim Shen  <timshen91@gmail.com>
 
 	* regex_executor.tcc: Add comments.

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

@@ -277,14 +277,15 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 		    "Functor used to map hash code to bucket index"
 		    " must be default constructible");
 
+      // _Hash_code_base has a protected default constructor, so use this
+      // derived type to tell if it's usable.
+      struct __access_protected_ctor : __hash_code_base { };
+
       // When hash codes are not cached local iterator inherits from
       // __hash_code_base above to compute node bucket index so it has to be
       // default constructible.
       static_assert(__if_hash_not_cached<
-		    is_default_constructible<
-		      // We use _Hashtable_ebo_helper to access the protected
-		      // default constructor.
-		      __detail::_Hashtable_ebo_helper<0, __hash_code_base, true>>>::value,
+		    is_default_constructible<__access_protected_ctor>>::value,
 		    "Cache the hash code or make functors involved in hash code"
 		    " and bucket index computation default constructible");
 

libstdc++-v3/testsuite/23_containers/unordered_set/not_default_constructible_hash_neg.cc

@@ -19,7 +19,7 @@
 // with this library; see the file COPYING3.  If not see
 // <http://www.gnu.org/licenses/>.
 
-// { dg-error "default constructible" "" { target *-*-* } 283 }
+// { dg-error "default constructible" "" { target *-*-* } 287 }
 
 #include <unordered_set>