Revert r289727 due to PR31384

This patch reverts the changes to tuple which fixed construction from
types derived from tuple. It breaks the code mentioned in llvm.org/PR31384.
I'll follow this commit up with a test case.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@289773 91177308-0d34-0410-b5e6-96231b3b80d8

include/__tuple

@@ -453,57 +453,19 @@ using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
 #endif  // _LIBCPP_HAS_NO_VARIADICS
 
 #ifndef _LIBCPP_CXX03_LANG
-
-template <class _Tp, size_t _TSize, bool _Good = true>
-struct __lookup_result {
-  using type = _Tp;
-  static constexpr bool _Success = _Good;
-  static constexpr size_t _Size = _TSize;
-};
-using __lookup_failure = __lookup_result<void, (size_t)-1, false>;
-
-template <class ..._Args>
-auto __deduce_tuple_type_ovl(tuple<_Args...>&)
-    -> __lookup_result<tuple<_Args...>, sizeof...(_Args)>;
-
-template <class _T1, class _T2>
-auto __deduce_tuple_type_ovl(pair<_T1, _T2>&)
-    -> __lookup_result<pair<_T1, _T2>, 2>;
-
-template <class _Tp, size_t _Size>
-auto __deduce_tuple_type_ovl(array<_Tp, _Size>&)
-  -> __lookup_result<array<_Tp, _Size>, _Size>;
-
-template <class _Tp>
-auto __deduce_tuple_type_imp(int)
-  -> decltype(__deduce_tuple_type_ovl(_VSTD::declval<__uncvref_t<_Tp>&>()));
-template <class> __lookup_failure __deduce_tuple_type_imp(...);
-
-// __deduce_tuple_like - Given a type determine if it is, or is derived from,
-//   a tuple-like type. This trait is used to support constructing and assigning
-//   to std::tuple from user-types derived from a tuple-like type.
-template <class _TupleLike,
-    class _Result = decltype(__deduce_tuple_type_imp<_TupleLike>(0)),
-    bool _Good = _Result::_Success>
-struct __deduce_tuple_like {
-  static_assert(_Good, "incorrect specialization choosen");
-  static constexpr bool _Success = true;
-  static constexpr size_t _Size = _Result::_Size;
-  using _RawType = typename _Result::type;
-  using _QualType =
-    typename __propagate_value_category<_TupleLike>::template __apply<_RawType>;
-};
-
-template <class _TupleLike, class _Result>
-struct __deduce_tuple_like<_TupleLike, _Result, /*_Good=*/false> {
-  static constexpr bool _Success = false;
-  static constexpr size_t _Size = (size_t)-1;
-};
-
-template <class _TupleLike, size_t _ExpectedSize,
-          class _Deduced = __deduce_tuple_like<_TupleLike>>
-using __tuple_like_with_size = integral_constant<bool,
-    _Deduced::_Success && _Deduced::_Size == _ExpectedSize>;
+template <bool _IsTuple, class _SizeTrait, size_t _Expected>
+struct __tuple_like_with_size_imp : false_type {};
+
+template <class _SizeTrait, size_t _Expected>
+struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
+    : integral_constant<bool, _SizeTrait::value == _Expected> {};
+
+template <class _Tuple, size_t _ExpectedSize,
+          class _RawTuple = typename __uncvref<_Tuple>::type>
+using __tuple_like_with_size = __tuple_like_with_size_imp<
+                                   __tuple_like<_RawTuple>::value,
+                                   tuple_size<_RawTuple>, _ExpectedSize
+                              >;
 
 struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
     template <class ...>

include/tuple

@@ -555,19 +555,13 @@ class _LIBCPP_TYPE_VIS_ONLY tuple
     {
         template <class _Tuple>
         static constexpr bool __enable_implicit() {
-            using _Deduced = __deduce_tuple_like<_Tuple>;
-            using _QualType = typename _Deduced::_QualType;
-            static_assert(__tuple_like<typename _Deduced::_RawType>::value, "");
-            return __tuple_convertible<_QualType, tuple>::value;
+            return __tuple_convertible<_Tuple, tuple>::value;
         }
 
         template <class _Tuple>
         static constexpr bool __enable_explicit() {
-            using _Deduced = __deduce_tuple_like<_Tuple>;
-            using _QualType = typename _Deduced::_QualType;
-            static_assert(__tuple_like<typename _Deduced::_RawType>::value, "");
-            return __tuple_constructible<_QualType, tuple>::value
-               && !__tuple_convertible<_QualType, tuple>::value;
+            return __tuple_constructible<_Tuple, tuple>::value
+               && !__tuple_convertible<_Tuple, tuple>::value;
         }
     };
 
@@ -820,74 +814,66 @@ public:
                     _VSTD::forward<_Up>(__u)...) {}
 
     template <class _Tuple,
-              class _Deduced = __deduce_tuple_like<_Tuple>,
-              class _TupBase = typename _Deduced::_QualType,
               typename enable_if
                       <
                          _CheckTupleLikeConstructor<
-                            _Deduced::_Size == sizeof...(_Tp)
-                             && !_PackExpandsToThisTuple<_TupBase>::value
-                         >::template __enable_implicit<_TupBase>(),
+                             __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
+                             && !_PackExpandsToThisTuple<_Tuple>::value
+                         >::template __enable_implicit<_Tuple>(),
                          bool
                       >::type = false
              >
         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
-        tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _TupBase>::value))
-            : base_(_VSTD::forward<_TupBase>(__t)) {}
+        tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
+            : base_(_VSTD::forward<_Tuple>(__t)) {}
 
     template <class _Tuple,
-              class _Deduced = __deduce_tuple_like<_Tuple>,
-              class _TupBase = typename _Deduced::_QualType,
               typename enable_if
                       <
                          _CheckTupleLikeConstructor<
-                              _Deduced::_Size == sizeof...(_Tp)
-                             && !_PackExpandsToThisTuple<_TupBase>::value
-                         >::template __enable_explicit<_TupBase>(),
+                             __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
+                             && !_PackExpandsToThisTuple<_Tuple>::value
+                         >::template __enable_explicit<_Tuple>(),
                          bool
                       >::type = false
              >
         _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
         explicit
-        tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _TupBase>::value))
-            : base_(_VSTD::forward<_TupBase>(__t)) {}
+        tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
+            : base_(_VSTD::forward<_Tuple>(__t)) {}
 
     template <class _Alloc, class _Tuple,
-              class _Deduced = __deduce_tuple_like<_Tuple>,
-              class _TupBase = typename _Deduced::_QualType,
               typename enable_if
                       <
                          _CheckTupleLikeConstructor<
-                             _Deduced::_Size == sizeof...(_Tp)
-                         >::template __enable_implicit<_TupBase>(),
+                             __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
+                         >::template __enable_implicit<_Tuple>(),
                          bool
                       >::type = false
              >
         _LIBCPP_INLINE_VISIBILITY
         tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
-            : base_(allocator_arg_t(), __a, _VSTD::forward<_TupBase>(__t)) {}
+            : base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
 
     template <class _Alloc, class _Tuple,
-              class _Deduced = __deduce_tuple_like<_Tuple>,
-              class _TupBase = typename _Deduced::_QualType,
               typename enable_if
                       <
                          _CheckTupleLikeConstructor<
-                             _Deduced::_Size == sizeof...(_Tp)
-                         >::template __enable_explicit<_TupBase>(),
+                             __tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
+                         >::template __enable_explicit<_Tuple>(),
                          bool
                       >::type = false
              >
         _LIBCPP_INLINE_VISIBILITY
         explicit
         tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
-            : base_(allocator_arg_t(), __a, _VSTD::forward<_TupBase>(__t)) {}
+            : base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
 
     using _CanCopyAssign = __all<is_copy_assignable<_Tp>::value...>;
     using _CanMoveAssign = __all<is_move_assignable<_Tp>::value...>;
 
     _LIBCPP_INLINE_VISIBILITY
-    tuple& operator=(typename conditional<_CanCopyAssign::value, tuple const&, __nat>::type const& __t)
+    tuple& operator=(typename conditional<_CanCopyAssign::value, tuple, __nat>::type const& __t)
         _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
     {
         base_.operator=(__t.base_);
@@ -903,19 +889,16 @@ public:
     }
 
     template <class _Tuple,
-              class _Deduced = __deduce_tuple_like<_Tuple>,
-              class _TupBase = typename _Deduced::_QualType,
               class = typename enable_if
                       <
-                         __tuple_assignable<_TupBase, tuple>::value
+                         __tuple_assignable<_Tuple, tuple>::value
                       >::type
              >
         _LIBCPP_INLINE_VISIBILITY
         tuple&
-        operator=(_Tuple&& __t)
-          _NOEXCEPT_((is_nothrow_assignable<base&, _TupBase>::value))
+        operator=(_Tuple&& __t) _NOEXCEPT_((is_nothrow_assignable<base&, _Tuple>::value))
         {
-            base_.operator=(_VSTD::forward<_TupBase>(__t));
+            base_.operator=(_VSTD::forward<_Tuple>(__t));
             return *this;
         }
 

include/type_traits

@@ -4696,65 +4696,6 @@ struct __can_extract_map_key<_ValTy, _Key, _Key, _RawValTy>
 
 #endif
 
-#ifndef _LIBCPP_CXX03_LANG
-
-// __propagate_value_category -- A utility for detecting the value category
-// of a given type and applying that value-category to another type.
-// For example applying the cv-ref quals of a derived type to form the
-// correctly cv-qualified base type.
-template <class _FromType>
-struct __propagate_value_category {
-  template <class _ToType> struct __checked_apply {
-    static_assert(!is_reference<_ToType>::value, "must be unqualified");
-    static_assert(!is_const<_ToType>::value
-               && !is_volatile<_ToType>::value, "must be unqualified");
-    using type = _ToType;
-  };
-  template <class _ToType>
-  using __apply = typename __checked_apply<_ToType>::type;
-};
-
-template <class _FromType>
-struct __propagate_value_category<_FromType&> {
-  template <class _ToType>
-  using __apply = typename add_lvalue_reference<
-    typename __propagate_value_category<_FromType>::template __apply<_ToType>
-  >::type;
-};
-
-template <class _FromType>
-struct __propagate_value_category<_FromType&&> {
-  template <class _ToType>
-  using __apply = typename add_rvalue_reference<
-    typename __propagate_value_category<_FromType>::template __apply<_ToType>
-  >::type;
-};
-
-template <class _FromType>
-struct __propagate_value_category<_FromType const> {
-  template <class _ToType>
-  using __apply = typename add_const<
-    typename __propagate_value_category<_FromType>::template __apply<_ToType>
-  >::type;
-};
-
-template <class _FromType>
-struct __propagate_value_category<_FromType volatile> {
-  template <class _ToType>
-  using __apply = typename add_volatile<
-    typename __propagate_value_category<_FromType>::template __apply<_ToType>
-  >::type;
-};
-
-template <class _FromType>
-struct __propagate_value_category<_FromType const volatile> {
-  template <class _ToType>
-  using __apply = typename add_cv<
-    typename __propagate_value_category<_FromType>::template __apply<_ToType>
-  >::type;
-};
-#endif
-
 _LIBCPP_END_NAMESPACE_STD
 
 #endif  // _LIBCPP_TYPE_TRAITS

test/std/utilities/tuple/tuple.tuple/tuple.assign/derived_from_tuple_like.pass.cpp

@@ -1,115 +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.
-//
-//===----------------------------------------------------------------------===//
-
-// <tuple>
-
-// template <class... Types> class tuple;
-
-// template <class... UTypes>
-//   tuple& operator=(const tuple<UTypes...>& u);
-
-// UNSUPPORTED: c++98, c++03
-
-#include <tuple>
-#include <array>
-#include <string>
-#include <utility>
-#include <cassert>
-
-#include "propagate_value_category.hpp"
-
-struct TracksIntQuals {
-  TracksIntQuals() : value(-1), value_category(VC_None), assigned(false) {}
-
-  template <class Tp,
-            class = typename std::enable_if<!std::is_same<
-                typename std::decay<Tp>::type, TracksIntQuals>::value>::type>
-  TracksIntQuals(Tp &&x)
-      : value(x), value_category(getValueCategory<Tp &&>()), assigned(false) {
-    static_assert(std::is_same<UnCVRef<Tp>, int>::value, "");
-  }
-
-  template <class Tp,
-            class = typename std::enable_if<!std::is_same<
-                typename std::decay<Tp>::type, TracksIntQuals>::value>::type>
-  TracksIntQuals &operator=(Tp &&x) {
-    static_assert(std::is_same<UnCVRef<Tp>, int>::value, "");
-    value = x;
-    value_category = getValueCategory<Tp &&>();
-    assigned = true;
-    return *this;
-  }
-
-  void reset() {
-    value = -1;
-    value_category = VC_None;
-    assigned = false;
-  }
-
-  bool checkConstruct(int expect, ValueCategory expect_vc) const {
-    return value != 1 && value == expect && value_category == expect_vc &&
-           assigned == false;
-  }
-
-  bool checkAssign(int expect, ValueCategory expect_vc) const {
-    return value != 1 && value == expect && value_category == expect_vc &&
-           assigned == true;
-  }
-
-  int value;
-  ValueCategory value_category;
-  bool assigned;
-};
-
-template <class Tup>
-struct DerivedFromTup : Tup {
-  using Tup::Tup;
-};
-
-template <ValueCategory VC>
-void do_derived_assign_test() {
-  using Tup1 = std::tuple<long, TracksIntQuals>;
-  Tup1 t;
-  auto reset = [&]() {
-    std::get<0>(t) = -1;
-    std::get<1>(t).reset();
-  };
-  {
-    DerivedFromTup<std::tuple<int, int>> d(42, 101);
-    t = ValueCategoryCast<VC>(d);
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkAssign(101, VC));
-  }
-  reset();
-  {
-    DerivedFromTup<std::pair<int, int>> d(42, 101);
-    t = ValueCategoryCast<VC>(d);
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkAssign(101, VC));
-  }
-  reset();
-  {
-    DerivedFromTup<std::array<int, 2>> d;
-    d[0] = 42;
-    d[1] = 101;
-    t = ValueCategoryCast<VC>(d);
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkAssign(101, VC));
-  }
-}
-
-int main() {
-    do_derived_assign_test<VC_LVal | VC_Const>();
-    do_derived_assign_test<VC_RVal>();
-#if defined(_LIBCPP_VERSION)
-    // Non-const copy assign and const move assign are libc++ extensions.
-    do_derived_assign_test<VC_LVal>();
-    do_derived_assign_test<VC_RVal | VC_Const>();
-#endif
-}

test/std/utilities/tuple/tuple.tuple/tuple.cnstr/derived_from_tuple_like.pass.cpp

@@ -1,154 +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.
-//
-//===----------------------------------------------------------------------===//
-
-// <tuple>
-
-// template <class... Types> class tuple;
-
-// template <class... UTypes>
-//   tuple& operator=(const tuple<UTypes...>& u);
-
-// UNSUPPORTED: c++98, c++03
-
-#include <tuple>
-#include <array>
-#include <string>
-#include <utility>
-#include <cassert>
-
-#include "propagate_value_category.hpp"
-
-template <bool Explicit = false>
-struct TracksIntQuals {
-  TracksIntQuals() : value(-1), value_category(VC_None), assigned(false) {}
-
-  template <
-      class Tp,
-      typename std::enable_if<Explicit &&
-                                  !std::is_same<typename std::decay<Tp>::type,
-                                                TracksIntQuals>::value,
-                              bool>::type = false>
-  explicit TracksIntQuals(Tp &&x)
-      : value(x), value_category(getValueCategory<Tp &&>()), assigned(false) {
-    static_assert(std::is_same<UnCVRef<Tp>, int>::value, "");
-  }
-
-  template <
-      class Tp,
-      typename std::enable_if<!Explicit &&
-                                  !std::is_same<typename std::decay<Tp>::type,
-                                                TracksIntQuals>::value,
-                              bool>::type = false>
-  TracksIntQuals(Tp &&x)
-      : value(x), value_category(getValueCategory<Tp &&>()), assigned(false) {
-    static_assert(std::is_same<UnCVRef<Tp>, int>::value, "");
-  }
-
-  template <class Tp,
-            class = typename std::enable_if<!std::is_same<
-                typename std::decay<Tp>::type, TracksIntQuals>::value>::type>
-  TracksIntQuals &operator=(Tp &&x) {
-    static_assert(std::is_same<UnCVRef<Tp>, int>::value, "");
-    value = x;
-    value_category = getValueCategory<Tp &&>();
-    assigned = true;
-    return *this;
-  }
-
-  void reset() {
-    value = -1;
-    value_category = VC_None;
-    assigned = false;
-  }
-
-  bool checkConstruct(int expect, ValueCategory expect_vc) const {
-    return value != 1 && value == expect && value_category == expect_vc &&
-           assigned == false;
-  }
-
-  bool checkAssign(int expect, ValueCategory expect_vc) const {
-    return value != 1 && value == expect && value_category == expect_vc &&
-           assigned == true;
-  }
-
-  int value;
-  ValueCategory value_category;
-  bool assigned;
-};
-
-template <class Tup>
-struct DerivedFromTup : Tup {
-  using Tup::Tup;
-};
-
-template <ValueCategory VC>
-void do_derived_construct_test() {
-  using Tup1 = std::tuple<long, TracksIntQuals</*Explicit*/ false>>;
-  {
-    DerivedFromTup<std::tuple<int, int>> d(42, 101);
-    Tup1 t = ValueCategoryCast<VC>(d);
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkConstruct(101, VC));
-  }
-  {
-    DerivedFromTup<std::pair<int, int>> d(42, 101);
-    Tup1 t = ValueCategoryCast<VC>(d);
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkConstruct(101, VC));
-  }
-  {
-    DerivedFromTup<std::array<int, 2>> d;
-    d[0] = 42;
-    d[1] = 101;
-    Tup1 t = ValueCategoryCast<VC>(d);
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkConstruct(101, VC));
-  }
-
-  using Tup2 = std::tuple<long, TracksIntQuals</*Explicit*/ true>>;
-  {
-    using D = DerivedFromTup<std::tuple<int, int>>;
-    static_assert(!std::is_convertible<ApplyValueCategoryT<VC, D>, Tup2>::value,
-                  "");
-    D d(42, 101);
-    Tup2 t(ValueCategoryCast<VC>(d));
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkConstruct(101, VC));
-  }
-  {
-    using D = DerivedFromTup<std::pair<int, int>>;
-    static_assert(!std::is_convertible<ApplyValueCategoryT<VC, D>, Tup2>::value,
-                  "");
-    D d(42, 101);
-    Tup2 t(ValueCategoryCast<VC>(d));
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkConstruct(101, VC));
-  }
-  {
-    using D = DerivedFromTup<std::array<int, 2>>;
-    static_assert(!std::is_convertible<ApplyValueCategoryT<VC, D>, Tup2>::value,
-                  "");
-    D d;
-    d[0] = 42;
-    d[1] = 101;
-    Tup2 t(ValueCategoryCast<VC>(d));
-    assert(std::get<0>(t) == 42);
-    assert(std::get<1>(t).checkConstruct(101, VC));
-  }
-}
-
-int main() {
-  do_derived_construct_test<VC_LVal | VC_Const>();
-  do_derived_construct_test<VC_RVal>();
-#if defined(_LIBCPP_VERSION)
-  // Supporting non-const copy and const move are libc++ extensions
-  do_derived_construct_test<VC_LVal>();
-  do_derived_construct_test<VC_RVal | VC_Const>();
-#endif
-}

test/support/propagate_value_category.hpp

@@ -1,145 +0,0 @@
-#ifndef TEST_SUPPORT_PROPAGATE_VALUE_CATEGORY
-#define TEST_SUPPORT_PROPAGATE_VALUE_CATEGORY
-
-#include "test_macros.h"
-#include <type_traits>
-
-#if TEST_STD_VER < 11
-#error this header may only be used in C++11
-#endif
-
-using UnderlyingVCType = unsigned;
-enum ValueCategory : UnderlyingVCType {
-  VC_None = 0,
-  VC_LVal = 1 << 0,
-  VC_RVal = 1 << 1,
-  VC_Const = 1 << 2,
-  VC_Volatile = 1 << 3,
-  VC_ConstVolatile = VC_Const | VC_Volatile
-};
-
-inline constexpr ValueCategory operator&(ValueCategory LHS, ValueCategory RHS) {
-  return ValueCategory(LHS & (UnderlyingVCType)RHS);
-}
-
-inline constexpr ValueCategory operator|(ValueCategory LHS, ValueCategory RHS) {
-  return ValueCategory(LHS | (UnderlyingVCType)RHS);
-}
-
-inline constexpr ValueCategory operator^(ValueCategory LHS, ValueCategory RHS) {
-  return ValueCategory(LHS ^ (UnderlyingVCType)RHS);
-}
-
-inline constexpr bool isValidValueCategory(ValueCategory VC) {
-  return (VC & (VC_LVal | VC_RVal)) != (VC_LVal | VC_RVal);
-}
-
-inline constexpr bool hasValueCategory(ValueCategory Arg, ValueCategory Key) {
-  return Arg == Key || ((Arg & Key) == Key);
-}
-
-template <class Tp>
-using UnCVRef =
-    typename std::remove_cv<typename std::remove_reference<Tp>::type>::type;
-
-template <class Tp>
-constexpr ValueCategory getReferenceQuals() {
-  return std::is_lvalue_reference<Tp>::value
-             ? VC_LVal
-             : (std::is_rvalue_reference<Tp>::value ? VC_RVal : VC_None);
-}
-static_assert(getReferenceQuals<int>() == VC_None, "");
-static_assert(getReferenceQuals<int &>() == VC_LVal, "");
-static_assert(getReferenceQuals<int &&>() == VC_RVal, "");
-
-template <class Tp>
-constexpr ValueCategory getCVQuals() {
-  using Vp = typename std::remove_reference<Tp>::type;
-  return std::is_const<Vp>::value && std::is_volatile<Vp>::value
-             ? VC_ConstVolatile
-             : (std::is_const<Vp>::value
-                    ? VC_Const
-                    : (std::is_volatile<Vp>::value ? VC_Volatile : VC_None));
-}
-static_assert(getCVQuals<int>() == VC_None, "");
-static_assert(getCVQuals<int const>() == VC_Const, "");
-static_assert(getCVQuals<int volatile>() == VC_Volatile, "");
-static_assert(getCVQuals<int const volatile>() == VC_ConstVolatile, "");
-static_assert(getCVQuals<int &>() == VC_None, "");
-static_assert(getCVQuals<int const &>() == VC_Const, "");
-
-template <class Tp>
-inline constexpr ValueCategory getValueCategory() {
-  return getReferenceQuals<Tp>() | getCVQuals<Tp>();
-}
-static_assert(getValueCategory<int>() == VC_None, "");
-static_assert(getValueCategory<int const &>() == (VC_LVal | VC_Const), "");
-static_assert(getValueCategory<int const volatile &&>() ==
-                  (VC_RVal | VC_ConstVolatile),
-              "");
-
-template <ValueCategory VC>
-struct ApplyValueCategory {
-private:
-  static_assert(isValidValueCategory(VC), "");
-
-  template <bool Pred, class Then, class Else>
-  using CondT = typename std::conditional<Pred, Then, Else>::type;
-
-public:
-  template <class Tp, class Vp = UnCVRef<Tp>>
-  using ApplyCVQuals = CondT<
-      hasValueCategory(VC, VC_ConstVolatile), typename std::add_cv<Vp>::type,
-      CondT<hasValueCategory(VC, VC_Const), typename std::add_const<Vp>::type,
-            CondT<hasValueCategory(VC, VC_Volatile),
-                  typename std::add_volatile<Vp>::type, Tp>>>;
-
-  template <class Tp, class Vp = typename std::remove_reference<Tp>::type>
-  using ApplyReferenceQuals =
-      CondT<hasValueCategory(VC, VC_LVal),
-            typename std::add_lvalue_reference<Vp>::type,
-            CondT<hasValueCategory(VC, VC_RVal),
-                  typename std::add_rvalue_reference<Vp>::type, Vp>>;
-
-  template <class Tp>
-  using Apply = ApplyReferenceQuals<ApplyCVQuals<UnCVRef<Tp>>>;
-
-  template <class Tp, bool Dummy = true,
-            typename std::enable_if<Dummy && (VC & VC_LVal), bool>::type = true>
-  static Apply<UnCVRef<Tp>> cast(Tp &&t) {
-    using ToType = Apply<UnCVRef<Tp>>;
-    return static_cast<ToType>(t);
-  }
-
-  template <class Tp, bool Dummy = true,
-            typename std::enable_if<Dummy && (VC & VC_RVal), bool>::type = true>
-  static Apply<UnCVRef<Tp>> cast(Tp &&t) {
-    using ToType = Apply<UnCVRef<Tp>>;
-    return static_cast<ToType>(std::move(t));
-  }
-
-  template <
-      class Tp, bool Dummy = true,
-      typename std::enable_if<Dummy && ((VC & (VC_LVal | VC_RVal)) == VC_None),
-                              bool>::type = true>
-  static Apply<UnCVRef<Tp>> cast(Tp &&t) {
-    return t;
-  }
-};
-
-template <ValueCategory VC, class Tp>
-using ApplyValueCategoryT = typename ApplyValueCategory<VC>::template Apply<Tp>;
-
-template <class Tp>
-using PropagateValueCategory = ApplyValueCategory<getValueCategory<Tp>()>;
-
-template <class Tp, class Up>
-using PropagateValueCategoryT =
-    typename ApplyValueCategory<getValueCategory<Tp>()>::template Apply<Up>;
-
-template <ValueCategory VC, class Tp>
-typename ApplyValueCategory<VC>::template Apply<Tp> ValueCategoryCast(Tp &&t) {
-  return ApplyValueCategory<VC>::cast(std::forward<Tp>(t));
-};
-
-#endif // TEST_SUPPORT_PROPAGATE_VALUE_CATEGORY