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[libcxx] Implement std::to_address for C++20

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Summary: Now implements P0653R2 - Utility to convert to raw pointer.

Reviewers: mclow.lists, EricWF

Reviewed By: EricWF

Subscribers: cfe-commits

Differential Revision: https://reviews.llvm.org/D35470

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@318865 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-11-22 19:49:21 +00:00
parent aa0e236289
commit 18a2685809
2 changed files with 160 additions and 1 deletions
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41
include/memory
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@@ -46,6 +46,9 @@ struct pointer_traits<T*>
static pointer pointer_to(<details>) noexcept;
};
template <class T> constexpr T* to_address(T* p) noexcept; // C++20
template <class Ptr> auto to_address(const Ptr& p) noexcept; // C++20
template <class Alloc>
struct allocator_traits
{
@@ -1090,13 +1093,14 @@ struct __const_void_pointer<_Ptr, _Alloc, false>
};
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
_Tp*
__to_raw_pointer(_Tp* __p) _NOEXCEPT
{
return __p;
}
#if _LIBCPP_STD_VER <= 17
template <class _Pointer>
inline _LIBCPP_INLINE_VISIBILITY
typename pointer_traits<_Pointer>::element_type*
@@ -1104,6 +1108,41 @@ __to_raw_pointer(_Pointer __p) _NOEXCEPT
{
return _VSTD::__to_raw_pointer(__p.operator->());
}
#else
template <class _Pointer>
inline _LIBCPP_INLINE_VISIBILITY
auto
__to_raw_pointer(const _Pointer& __p) _NOEXCEPT
-> decltype(pointer_traits<_Pointer>::to_address(__p))
{
return pointer_traits<_Pointer>::to_address(__p);
}
template <class _Pointer, class... _None>
inline _LIBCPP_INLINE_VISIBILITY
auto
__to_raw_pointer(const _Pointer& __p, _None...) _NOEXCEPT
{
return _VSTD::__to_raw_pointer(__p.operator->());
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY constexpr
_Tp*
to_address(_Tp* __p) _NOEXCEPT
{
static_assert(!is_function_v<_Tp>, "_Tp is a function type");
return __p;
}
template <class _Pointer>
inline _LIBCPP_INLINE_VISIBILITY
auto
to_address(const _Pointer& __p) _NOEXCEPT
{
return _VSTD::__to_raw_pointer(__p);
}
#endif
template <class _Tp, class = void>
struct __has_size_type : false_type {};