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Prefer to use the __is_XXX compiler intrinsics to the (old, busted) __has_XXX intrinsics when implementing type traits. Thanks to Richard Smith for the patch.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@344254 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-10-11 15:38:07 +00:00
parent e436a759bf
commit 2199647acb
1 changed files with 40 additions and 15 deletions
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55
include/type_traits
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@@ -3686,7 +3686,12 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_move_assignable_v
// is_trivially_destructible
#if __has_feature(has_trivial_destructor) || (_GNUC_VER >= 403)
#if __has_keyword(__is_trivially_destructible)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible
: public integral_constant<bool, __is_trivially_destructible(_Tp)> {};
#elif __has_feature(has_trivial_destructor) || (_GNUC_VER >= 403)
template <class _Tp> struct _LIBCPP_TEMPLATE_VIS is_trivially_destructible
: public integral_constant<bool, is_destructible<_Tp>::value && __has_trivial_destructor(_Tp)> {};
@@ -3713,18 +3718,15 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_trivially_destructible_v
// is_nothrow_constructible
#if 0
template <class _Tp, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible
: public integral_constant<bool, __is_nothrow_constructible(_Tp(_Args...))>
{
};
#else
#ifndef _LIBCPP_HAS_NO_VARIADICS
#if __has_feature(cxx_noexcept) || (_GNUC_VER >= 407 && __cplusplus >= 201103L)
#if __has_keyword(__is_nothrow_constructible)
template <class _Tp, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible
: public integral_constant<bool, __is_nothrow_constructible(_Tp, _Args...)> {};
#elif __has_feature(cxx_noexcept) || (_GNUC_VER >= 407 && __cplusplus >= 201103L)
template <bool, bool, class _Tp, class... _Args> struct __libcpp_is_nothrow_constructible;
@@ -3761,7 +3763,7 @@ struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp[_Ns]>
{
};
#else // __has_feature(cxx_noexcept)
#else // __has_keyword(__is_nothrow_constructible) || __has_feature(cxx_noexcept)
template <class _Tp, class... _Args>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible
@@ -3817,6 +3819,23 @@ struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp, _Tp&>
#else // _LIBCPP_HAS_NO_VARIADICS
#if __has_keyword(__is_nothrow_constructible)
template <class _Tp, class _A0 = __is_construct::__nat,
class _A1 = __is_construct::__nat>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible
: public integral_constant<bool, __is_nothrow_constructible(_Tp, _A0, _A1)> {};
template <class _Tp, class _A0>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp, _A0>
: public integral_constant<bool, __is_nothrow_constructible(_Tp, _A0)> {};
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp>
: public integral_constant<bool, __is_nothrow_constructible(_Tp)> {};
#else // __has_keyword(__is_nothrow_constructible)
template <class _Tp, class _A0 = __is_construct::__nat,
class _A1 = __is_construct::__nat>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible
@@ -3868,8 +3887,8 @@ struct _LIBCPP_TEMPLATE_VIS is_nothrow_constructible<_Tp, _Tp&,
{
};
#endif // __has_keyword(__is_nothrow_constructible)
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // __has_feature(is_nothrow_constructible)
#if _LIBCPP_STD_VER > 14 && !defined(_LIBCPP_HAS_NO_VARIABLE_TEMPLATES) && !defined(_LIBCPP_HAS_NO_VARIADICS)
template <class _Tp, class ..._Args>
@@ -3919,7 +3938,13 @@ _LIBCPP_INLINE_VAR _LIBCPP_CONSTEXPR bool is_nothrow_move_constructible_v
// is_nothrow_assignable
#if __has_feature(cxx_noexcept) || (_GNUC_VER >= 407 && __cplusplus >= 201103L)
#if __has_keyword(__is_nothrow_assignable)
template <class _Tp, class _Arg>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable
: public integral_constant<bool, __is_nothrow_assignable(_Tp, _Arg)> {};
#elif __has_feature(cxx_noexcept) || (_GNUC_VER >= 407 && __cplusplus >= 201103L)
template <bool, class _Tp, class _Arg> struct __libcpp_is_nothrow_assignable;
@@ -3941,7 +3966,7 @@ struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable
{
};
#else // __has_feature(cxx_noexcept)
#else // __has_keyword(__is_nothrow_assignable) || __has_feature(cxx_noexcept)
template <class _Tp, class _Arg>
struct _LIBCPP_TEMPLATE_VIS is_nothrow_assignable