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Implement P0777: Treating unnecessay decay

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@324398 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow 2018-02-06 20:56:55 +00:00
parent 68b20ca4d9
commit 52f9ca28a3
4 changed files with 12 additions and 14 deletions
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6
include/optional
View File

@ -612,8 +612,8 @@ private:
};
template <class _Up>
using _CheckOptionalArgsCtor = conditional_t<
!is_same_v<decay_t<_Up>, in_place_t> &&
!is_same_v<decay_t<_Up>, optional>,
!is_same_v<__uncvref_t<_Up>, in_place_t> &&
!is_same_v<__uncvref_t<_Up>, optional>,
_CheckOptionalArgsConstructor,
__check_tuple_constructor_fail
>;
@ -761,7 +761,7 @@ public:
class = enable_if_t
<__lazy_and<
integral_constant<bool,
!is_same_v<decay_t<_Up>, optional> &&
!is_same_v<__uncvref_t<_Up>, optional> &&
!(is_same_v<_Up, value_type> && is_scalar_v<value_type>)
>,
is_constructible<value_type, _Up>,

8
include/tuple
View File

@ -211,7 +211,7 @@ public:
template <class _Tp,
class = typename enable_if<
__lazy_and<
__lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>>
__lazy_not<is_same<typename __uncvref<_Tp>::type, __tuple_leaf>>
, is_constructible<_Hp, _Tp>
>::value
>::type
@ -293,7 +293,7 @@ public:
template <class _Tp,
class = typename enable_if<
__lazy_and<
__lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>>
__lazy_not<is_same<typename __uncvref<_Tp>::type, __tuple_leaf>>
, is_constructible<_Hp, _Tp>
>::value
>::type
@ -1383,7 +1383,7 @@ constexpr decltype(auto) apply(_Fn && __f, _Tuple && __t)
_LIBCPP_NOEXCEPT_RETURN(
_VSTD::__apply_tuple_impl(
_VSTD::forward<_Fn>(__f), _VSTD::forward<_Tuple>(__t),
typename __make_tuple_indices<tuple_size_v<decay_t<_Tuple>>>::type{})
typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})
)
template <class _Tp, class _Tuple, size_t... _Idx>
@ -1398,7 +1398,7 @@ inline _LIBCPP_INLINE_VISIBILITY
constexpr _Tp make_from_tuple(_Tuple&& __t)
_LIBCPP_NOEXCEPT_RETURN(
_VSTD::__make_from_tuple_impl<_Tp>(_VSTD::forward<_Tuple>(__t),
typename __make_tuple_indices<tuple_size_v<decay_t<_Tuple>>>::type{})
typename __make_tuple_indices<tuple_size_v<remove_reference_t<_Tuple>>>::type{})
)
#undef _LIBCPP_NOEXCEPT_RETURN

4
include/type_traits
View File

@ -1180,9 +1180,7 @@ struct __is_same_uncvref : is_same<typename __uncvref<_Tp>::type,
#if _LIBCPP_STD_VER > 17
// aligned_union - same as __uncvref
template <class _Tp>
struct remove_cvref {
using type = remove_cv_t<remove_reference_t<_Tp>>;
};
struct remove_cvref : public __uncvref<_Tp> {};
template <class _Tp> using remove_cvref_t = typename remove_cvref<_Tp>::type;
#endif

8
include/variant
View File

@ -1143,9 +1143,9 @@ public:
template <
class _Arg,
enable_if_t<!is_same_v<decay_t<_Arg>, variant>, int> = 0,
enable_if_t<!__is_inplace_type<decay_t<_Arg>>::value, int> = 0,
enable_if_t<!__is_inplace_index<decay_t<_Arg>>::value, int> = 0,
enable_if_t<!is_same_v<__uncvref_t<_Arg>, variant>, int> = 0,
enable_if_t<!__is_inplace_type<__uncvref_t<_Arg>>::value, int> = 0,
enable_if_t<!__is_inplace_index<__uncvref_t<_Arg>>::value, int> = 0,
class _Tp = __variant_detail::__best_match_t<_Arg, _Types...>,
size_t _Ip =
__find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value,
@ -1215,7 +1215,7 @@ public:
template <
class _Arg,
enable_if_t<!is_same_v<decay_t<_Arg>, variant>, int> = 0,
enable_if_t<!is_same_v<__uncvref_t<_Arg>, variant>, int> = 0,
class _Tp = __variant_detail::__best_match_t<_Arg, _Types...>,
size_t _Ip =
__find_detail::__find_unambiguous_index_sfinae<_Tp, _Types...>::value,