[libcxx] r194154 - Fix several tuple bugs that were exposed by clang's implementation of CWG 1402. This fixes http://llvm.org/bugs/show_bug.cgi?id=17798.

[Howard Hinnant]

Author: hhinnant
Date: Wed Nov  6 11:45:43 2013
New Revision: 194154

URL: http://llvm.org/viewvc/llvm-project?rev=194154&view=rev
Log:
Fix several tuple bugs that were exposed by clang's implementation of CWG 1402.  This fixes http://llvm.org/bugs/show_bug.cgi?id=17798.

Modified:
    libcxx/trunk/include/tuple

Modified: libcxx/trunk/include/tuple
URL: http://llvm.org/viewvc/llvm-project/libcxx/trunk/include/tuple?rev=194154&r1=194153&r2=194154&view=diff
==============================================================================
--- libcxx/trunk/include/tuple (original)
+++ libcxx/trunk/include/tuple Wed Nov  6 11:45:43 2013
@@ -270,7 +270,7 @@ public:
     _LIBCPP_INLINE_VISIBILITY
     _LIBCPP_CONSTEXPR_AFTER_CXX11
     __tuple_leaf(__tuple_leaf&& __t) _NOEXCEPT_(is_nothrow_move_constructible<_Hp>::value)
-        : value(_VSTD::move(__t.get()))
+        : value(_VSTD::forward<_Hp>(__t.get()))
         {}
 
     template <class _Tp>
@@ -457,13 +457,24 @@ struct __tuple_impl<__tuple_indices<_Ind
             return *this;
         }
 
-        _LIBCPP_INLINE_VISIBILITY
-        __tuple_impl&
-        operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
-        {
-            __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
-            return *this;
-        }
+    __tuple_impl(const __tuple_impl&) = default;
+    __tuple_impl(__tuple_impl&&) = default;
+
+    _LIBCPP_INLINE_VISIBILITY
+    __tuple_impl&
+    operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
+    {
+        __swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
+        return *this;
+    }
+
+    _LIBCPP_INLINE_VISIBILITY
+    __tuple_impl&
+    operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value))
+    {
+        __swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...);
+        return *this;
+    }
 
     _LIBCPP_INLINE_VISIBILITY
     void swap(__tuple_impl& __t)