f1417eb9b1
Most of our private headers need to be treated as submodules so that Clang modules can export things correctly. Previous commits that split monolithic headers into smaller chunks were unaware of this requirement, and so this is being addressed in one fell swoop. Moving forward, most new headers will need to have their own submodule (anything that's conditionally included is exempt from this rule, which means `__support` headers aren't made into submodules). This hasn't been marked NFC, since I'm not 100% sure that's the case. Differential Revision: https://reviews.llvm.org/D103551
217 lines
6.6 KiB
C++
217 lines
6.6 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MEMORY_POINTER_TRAITS_H
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#define _LIBCPP___MEMORY_POINTER_TRAITS_H
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#include <__config>
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#include <__memory/addressof.h>
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#include <type_traits>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp, class = void>
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struct __has_element_type : false_type {};
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template <class _Tp>
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struct __has_element_type<_Tp,
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typename __void_t<typename _Tp::element_type>::type> : true_type {};
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template <class _Ptr, bool = __has_element_type<_Ptr>::value>
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struct __pointer_traits_element_type;
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template <class _Ptr>
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struct __pointer_traits_element_type<_Ptr, true>
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{
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typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::element_type type;
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args>
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struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, true>
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{
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typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::element_type type;
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args>
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struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, false>
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{
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typedef _LIBCPP_NODEBUG_TYPE _Tp type;
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};
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template <class _Tp, class = void>
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struct __has_difference_type : false_type {};
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template <class _Tp>
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struct __has_difference_type<_Tp,
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typename __void_t<typename _Tp::difference_type>::type> : true_type {};
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template <class _Ptr, bool = __has_difference_type<_Ptr>::value>
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struct __pointer_traits_difference_type
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{
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typedef _LIBCPP_NODEBUG_TYPE ptrdiff_t type;
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};
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template <class _Ptr>
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struct __pointer_traits_difference_type<_Ptr, true>
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{
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typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::difference_type type;
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};
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template <class _Tp, class _Up>
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struct __has_rebind
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{
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private:
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struct __two {char __lx; char __lxx;};
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template <class _Xp> static __two __test(...);
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_LIBCPP_SUPPRESS_DEPRECATED_PUSH
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template <class _Xp> static char __test(typename _Xp::template rebind<_Up>* = 0);
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_LIBCPP_SUPPRESS_DEPRECATED_POP
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public:
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static const bool value = sizeof(__test<_Tp>(0)) == 1;
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};
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template <class _Tp, class _Up, bool = __has_rebind<_Tp, _Up>::value>
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struct __pointer_traits_rebind
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{
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#ifndef _LIBCPP_CXX03_LANG
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typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up> type;
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#else
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typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up>::other type;
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#endif
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args, class _Up>
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struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, true>
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{
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#ifndef _LIBCPP_CXX03_LANG
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typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::template rebind<_Up> type;
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#else
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typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::template rebind<_Up>::other type;
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#endif
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};
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template <template <class, class...> class _Sp, class _Tp, class ..._Args, class _Up>
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struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, false>
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{
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typedef _Sp<_Up, _Args...> type;
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};
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template <class _Ptr>
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struct _LIBCPP_TEMPLATE_VIS pointer_traits
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{
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typedef _Ptr pointer;
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typedef typename __pointer_traits_element_type<pointer>::type element_type;
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typedef typename __pointer_traits_difference_type<pointer>::type difference_type;
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#ifndef _LIBCPP_CXX03_LANG
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template <class _Up> using rebind = typename __pointer_traits_rebind<pointer, _Up>::type;
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#else
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template <class _Up> struct rebind
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{typedef typename __pointer_traits_rebind<pointer, _Up>::type other;};
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#endif // _LIBCPP_CXX03_LANG
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private:
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struct __nat {};
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public:
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_LIBCPP_INLINE_VISIBILITY
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static pointer pointer_to(typename conditional<is_void<element_type>::value,
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__nat, element_type>::type& __r)
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{return pointer::pointer_to(__r);}
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};
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template <class _Tp>
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struct _LIBCPP_TEMPLATE_VIS pointer_traits<_Tp*>
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{
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typedef _Tp* pointer;
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typedef _Tp element_type;
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typedef ptrdiff_t difference_type;
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#ifndef _LIBCPP_CXX03_LANG
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template <class _Up> using rebind = _Up*;
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#else
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template <class _Up> struct rebind {typedef _Up* other;};
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#endif
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private:
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struct __nat {};
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public:
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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static pointer pointer_to(typename conditional<is_void<element_type>::value,
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__nat, element_type>::type& __r) _NOEXCEPT
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{return _VSTD::addressof(__r);}
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};
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template <class _From, class _To>
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struct __rebind_pointer {
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#ifndef _LIBCPP_CXX03_LANG
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typedef typename pointer_traits<_From>::template rebind<_To> type;
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#else
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typedef typename pointer_traits<_From>::template rebind<_To>::other type;
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#endif
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};
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// to_address
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template <class _Pointer, class = void>
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struct __to_address_helper;
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template <class _Tp>
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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_Tp* __to_address(_Tp* __p) _NOEXCEPT {
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static_assert(!is_function<_Tp>::value, "_Tp is a function type");
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return __p;
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}
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// enable_if is needed here to avoid instantiating checks for fancy pointers on raw pointers
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template <class _Pointer, class = _EnableIf<!is_pointer<_Pointer>::value> >
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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typename decay<decltype(__to_address_helper<_Pointer>::__call(declval<const _Pointer&>()))>::type
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__to_address(const _Pointer& __p) _NOEXCEPT {
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return __to_address_helper<_Pointer>::__call(__p);
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}
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template <class _Pointer, class>
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struct __to_address_helper {
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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static decltype(_VSTD::__to_address(declval<const _Pointer&>().operator->()))
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__call(const _Pointer&__p) _NOEXCEPT {
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return _VSTD::__to_address(__p.operator->());
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}
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};
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template <class _Pointer>
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struct __to_address_helper<_Pointer, decltype((void)pointer_traits<_Pointer>::to_address(declval<const _Pointer&>()))> {
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_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
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static decltype(pointer_traits<_Pointer>::to_address(declval<const _Pointer&>()))
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__call(const _Pointer&__p) _NOEXCEPT {
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return pointer_traits<_Pointer>::to_address(__p);
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}
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};
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#if _LIBCPP_STD_VER > 17
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template <class _Pointer>
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inline _LIBCPP_INLINE_VISIBILITY constexpr
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auto to_address(const _Pointer& __p) noexcept {
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return _VSTD::__to_address(__p);
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MEMORY_POINTER_TRAITS_H
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