[libcxx] r214427 - [libcxx] Remove use of default function template parameters in type traits. Fixes DR20484

[Eric Fiselier]

Author: ericwf
Date: Thu Jul 31 14:35:37 2014
New Revision: 214427

URL: http://llvm.org/viewvc/llvm-project?rev=214427&view=rev
Log:
[libcxx] Remove use of default function template parameters in type traits. Fixes DR20484

Summary: This patch moves the SFINAE for __is_destructor_welformed out of the function template parameters. type_traits must compile in c++03 mode since it is included in c++03 headers. 

Test Plan: No tests have been added.

Reviewers: danalbert, mclow.lists

Reviewed By: danalbert

Subscribers: K-ballo, cfe-commits

Differential Revision: http://reviews.llvm.org/D4735

Modified:
    libcxx/branches/release_35/include/type_traits

Modified: libcxx/branches/release_35/include/type_traits
URL: http://llvm.org/viewvc/llvm-project/libcxx/branches/release_35/include/type_traits?rev=214427&r1=214426&r2=214427&view=diff
==============================================================================
--- libcxx/branches/release_35/include/type_traits (original)
+++ libcxx/branches/release_35/include/type_traits Thu Jul 31 14:35:37 2014
@@ -1544,16 +1544,21 @@ template <class _Tp> struct _LIBCPP_TYPE
 //	Otherwise, return "std::declval<_Up&>().~_Up()" is well-formed
 //    where _Up is remove_all_extents<_Tp>::type
 
+template <class>
+struct __is_destructible_apply { typedef int type; };
+
 template <typename _Tp>
 struct __is_destructor_wellformed {
-	template <typename _Tp1, typename _Tp2 = decltype(_VSTD::declval<_Tp1&>().~_Tp1())>
-	static char  __test (int);
+	template <typename _Tp1>
+	static char  __test (
+        typename __is_destructible_apply<decltype(_VSTD::declval<_Tp1&>().~_Tp1())>::type
+    );
 
 	template <typename _Tp1>
 	static __two __test (...);
 	
 	static const bool value = sizeof(__test<_Tp>(12)) == sizeof(char);
-	};
+};
 
 template <class _Tp, bool>
 struct __destructible_imp;