Revert r276548 - Make pair/tuples assignment operators SFINAE properly.

This is a breaking change. The SFINAE required is instantiated the second
the class is instantiated, and this can cause hard SFINAE errors
when applied to references to incomplete types. Ex.

struct IncompleteType;
extern IncompleteType it;
std::tuple<IncompleteType&> t(it); // SFINAE will blow up.

llvm-svn: 276598

1 files changed, 0 insertions, 90 deletions

diff --git a/libcxx/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp b/libcxx/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp
deleted file mode 100644
index d75b6a5f820..00000000000
--- a/libcxx/test/std/utilities/utility/pairs/pairs.pair/assign_pair.pass.cpp
+++ /dev/null
@@ -1,90 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     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.
-//
-//===----------------------------------------------------------------------===//
-
-// UNSUPPORTED: 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& operator=(NonAssignable const&) = delete;
-  NonAssignable& operator=(NonAssignable&&) = delete;
-};
-struct CopyAssignable {
-  CopyAssignable() = default;
-  CopyAssignable(CopyAssignable const&) = default;
-  CopyAssignable& operator=(CopyAssignable const&) = default;
-  CopyAssignable& operator=(CopyAssignable&&) = delete;
-};
-struct MoveAssignable {
-  MoveAssignable() = default;
-  MoveAssignable& operator=(MoveAssignable const&) = delete;
-  MoveAssignable& operator=(MoveAssignable&&) = default;
-};
-
-
-struct CountAssign {
-  static int copied;
-  static int moved;
-  static void reset() { copied = moved = 0; }
-  CountAssign() = default;
-  CountAssign& operator=(CountAssign const&) { ++copied; return *this; }
-  CountAssign& operator=(CountAssign&&) { ++moved; return *this; }
-};
-int CountAssign::copied = 0;
-int CountAssign::moved = 0;
-
-int main()
-{
-    {
-        typedef std::pair<CopyAssignable, short> P;
-        const P p1(CopyAssignable(), 4);
-        P p2;
-        p2 = p1;
-        assert(p2.second == 4);
-    }
-    {
-        using P = std::pair<int&, int&&>;
-        int x = 42;
-        int y = 101;
-        int x2 = -1;
-        int y2 = 300;
-        P p1(x, std::move(y));
-        P p2(x2, std::move(y2));
-        p1 = p2;
-        assert(p1.first == x2);
-        assert(p1.second == y2);
-    }
-    {
-        using P = std::pair<int, NonAssignable>;
-        static_assert(!std::is_copy_assignable<P>::value, "");
-    }
-    {
-        CountAssign::reset();
-        using P = std::pair<CountAssign, CopyAssignable>;
-        static_assert(std::is_copy_assignable<P>::value, "");
-        P p;
-        P p2;
-        p = p2;
-        assert(CountAssign::copied == 1);
-        assert(CountAssign::moved == 0);
-    }
-    {
-        using P = std::pair<int, MoveAssignable>;
-        static_assert(!std::is_copy_assignable<P>::value, "");
-    }
-}