typedef typename remove_reference<_T1>::type _T1Unref;
typedef typename remove_reference<_T2>::type _T2Unref;
+#if !defined(_LIBCPP_CXX03_LANG)
typedef integral_constant<bool,
is_copy_assignable<_T1>::value
&& is_copy_assignable<_T2>::value> _CanCopyAssign;
+#else
+ typedef true_type _CanCopyAssign;
+#endif
_LIBCPP_INLINE_VISIBILITY
pair& operator=(typename conditional<_CanCopyAssign::value, pair, __nat>::type const& __p)
--- /dev/null
+//===----------------------------------------------------------------------===//
+//
+// 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.
+//
+//===----------------------------------------------------------------------===//
+
+// REQUIRES-ANY: c++98, c++03
+
+// <utility>
+
+// template <class T1, class T2> struct pair
+
+// pair& operator=(pair const& p);
+
+#include <utility>
+#include <memory>
+#include <cassert>
+
+
+struct NonAssignable {
+ NonAssignable() {}
+private:
+ NonAssignable& operator=(NonAssignable const&);
+};
+
+int main()
+{
+ // Test that we don't constrain the assignment operator in C++03 mode.
+ // Since we don't have access control SFINAE having pair evaluate SFINAE
+ // may cause a hard error.
+ typedef std::pair<int, NonAssignable> P;
+ static_assert(std::is_copy_assignable<P>::value, "");
+}