forked from OSchip/llvm-project
234 lines
6.8 KiB
C++
234 lines
6.8 KiB
C++
// -*- C++ -*-
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef _LIBCPP___MEMORY_POINTER_TRAITS_H
|
|
#define _LIBCPP___MEMORY_POINTER_TRAITS_H
|
|
|
|
#include <__config>
|
|
#include <type_traits>
|
|
|
|
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
|
|
#pragma GCC system_header
|
|
#endif
|
|
|
|
_LIBCPP_PUSH_MACROS
|
|
#include <__undef_macros>
|
|
|
|
_LIBCPP_BEGIN_NAMESPACE_STD
|
|
|
|
template <class _Tp, class = void>
|
|
struct __has_element_type : false_type {};
|
|
|
|
template <class _Tp>
|
|
struct __has_element_type<_Tp,
|
|
typename __void_t<typename _Tp::element_type>::type> : true_type {};
|
|
|
|
template <class _Ptr, bool = __has_element_type<_Ptr>::value>
|
|
struct __pointer_traits_element_type;
|
|
|
|
template <class _Ptr>
|
|
struct __pointer_traits_element_type<_Ptr, true>
|
|
{
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::element_type type;
|
|
};
|
|
|
|
template <template <class, class...> class _Sp, class _Tp, class ..._Args>
|
|
struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, true>
|
|
{
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::element_type type;
|
|
};
|
|
|
|
template <template <class, class...> class _Sp, class _Tp, class ..._Args>
|
|
struct __pointer_traits_element_type<_Sp<_Tp, _Args...>, false>
|
|
{
|
|
typedef _LIBCPP_NODEBUG_TYPE _Tp type;
|
|
};
|
|
|
|
template <class _Tp, class = void>
|
|
struct __has_difference_type : false_type {};
|
|
|
|
template <class _Tp>
|
|
struct __has_difference_type<_Tp,
|
|
typename __void_t<typename _Tp::difference_type>::type> : true_type {};
|
|
|
|
template <class _Ptr, bool = __has_difference_type<_Ptr>::value>
|
|
struct __pointer_traits_difference_type
|
|
{
|
|
typedef _LIBCPP_NODEBUG_TYPE ptrdiff_t type;
|
|
};
|
|
|
|
template <class _Ptr>
|
|
struct __pointer_traits_difference_type<_Ptr, true>
|
|
{
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Ptr::difference_type type;
|
|
};
|
|
|
|
template <class _Tp, class _Up>
|
|
struct __has_rebind
|
|
{
|
|
private:
|
|
struct __two {char __lx; char __lxx;};
|
|
template <class _Xp> static __two __test(...);
|
|
_LIBCPP_SUPPRESS_DEPRECATED_PUSH
|
|
template <class _Xp> static char __test(typename _Xp::template rebind<_Up>* = 0);
|
|
_LIBCPP_SUPPRESS_DEPRECATED_POP
|
|
public:
|
|
static const bool value = sizeof(__test<_Tp>(0)) == 1;
|
|
};
|
|
|
|
template <class _Tp, class _Up, bool = __has_rebind<_Tp, _Up>::value>
|
|
struct __pointer_traits_rebind
|
|
{
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up> type;
|
|
#else
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Tp::template rebind<_Up>::other type;
|
|
#endif
|
|
};
|
|
|
|
template <template <class, class...> class _Sp, class _Tp, class ..._Args, class _Up>
|
|
struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, true>
|
|
{
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::template rebind<_Up> type;
|
|
#else
|
|
typedef _LIBCPP_NODEBUG_TYPE typename _Sp<_Tp, _Args...>::template rebind<_Up>::other type;
|
|
#endif
|
|
};
|
|
|
|
template <template <class, class...> class _Sp, class _Tp, class ..._Args, class _Up>
|
|
struct __pointer_traits_rebind<_Sp<_Tp, _Args...>, _Up, false>
|
|
{
|
|
typedef _Sp<_Up, _Args...> type;
|
|
};
|
|
|
|
template <class _Ptr>
|
|
struct _LIBCPP_TEMPLATE_VIS pointer_traits
|
|
{
|
|
typedef _Ptr pointer;
|
|
typedef typename __pointer_traits_element_type<pointer>::type element_type;
|
|
typedef typename __pointer_traits_difference_type<pointer>::type difference_type;
|
|
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
template <class _Up> using rebind = typename __pointer_traits_rebind<pointer, _Up>::type;
|
|
#else
|
|
template <class _Up> struct rebind
|
|
{typedef typename __pointer_traits_rebind<pointer, _Up>::type other;};
|
|
#endif // _LIBCPP_CXX03_LANG
|
|
|
|
private:
|
|
struct __nat {};
|
|
public:
|
|
_LIBCPP_INLINE_VISIBILITY
|
|
static pointer pointer_to(typename conditional<is_void<element_type>::value,
|
|
__nat, element_type>::type& __r)
|
|
{return pointer::pointer_to(__r);}
|
|
};
|
|
|
|
template <class _Tp>
|
|
struct _LIBCPP_TEMPLATE_VIS pointer_traits<_Tp*>
|
|
{
|
|
typedef _Tp* pointer;
|
|
typedef _Tp element_type;
|
|
typedef ptrdiff_t difference_type;
|
|
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
template <class _Up> using rebind = _Up*;
|
|
#else
|
|
template <class _Up> struct rebind {typedef _Up* other;};
|
|
#endif
|
|
|
|
private:
|
|
struct __nat {};
|
|
public:
|
|
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
|
|
static pointer pointer_to(typename conditional<is_void<element_type>::value,
|
|
__nat, element_type>::type& __r) _NOEXCEPT
|
|
{return _VSTD::addressof(__r);}
|
|
};
|
|
|
|
template <class _From, class _To>
|
|
struct __rebind_pointer {
|
|
#ifndef _LIBCPP_CXX03_LANG
|
|
typedef typename pointer_traits<_From>::template rebind<_To> type;
|
|
#else
|
|
typedef typename pointer_traits<_From>::template rebind<_To>::other type;
|
|
#endif
|
|
};
|
|
|
|
// to_address
|
|
|
|
template <bool _UsePointerTraits> struct __to_address_helper;
|
|
|
|
template <> struct __to_address_helper<true> {
|
|
template <class _Pointer>
|
|
using __return_type = decltype(pointer_traits<_Pointer>::to_address(_VSTD::declval<const _Pointer&>()));
|
|
|
|
template <class _Pointer>
|
|
_LIBCPP_CONSTEXPR
|
|
static __return_type<_Pointer>
|
|
__do_it(const _Pointer &__p) _NOEXCEPT { return pointer_traits<_Pointer>::to_address(__p); }
|
|
};
|
|
|
|
template <class _Pointer, bool _Dummy = true>
|
|
using __choose_to_address = __to_address_helper<_IsValidExpansion<__to_address_helper<_Dummy>::template __return_type, _Pointer>::value>;
|
|
|
|
template <class _Tp>
|
|
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
|
|
_Tp*
|
|
__to_address(_Tp* __p) _NOEXCEPT
|
|
{
|
|
static_assert(!is_function<_Tp>::value, "_Tp is a function type");
|
|
return __p;
|
|
}
|
|
|
|
template <class _Pointer>
|
|
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR
|
|
typename __choose_to_address<_Pointer>::template __return_type<_Pointer>
|
|
__to_address(const _Pointer& __p) _NOEXCEPT
|
|
{
|
|
return __choose_to_address<_Pointer>::__do_it(__p);
|
|
}
|
|
|
|
template <> struct __to_address_helper<false> {
|
|
template <class _Pointer>
|
|
using __return_type = typename pointer_traits<_Pointer>::element_type*;
|
|
|
|
template <class _Pointer>
|
|
_LIBCPP_CONSTEXPR
|
|
static __return_type<_Pointer>
|
|
__do_it(const _Pointer &__p) _NOEXCEPT { return _VSTD::__to_address(__p.operator->()); }
|
|
};
|
|
|
|
|
|
#if _LIBCPP_STD_VER > 17
|
|
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 constexpr
|
|
auto
|
|
to_address(const _Pointer& __p) _NOEXCEPT
|
|
{
|
|
return _VSTD::__to_address(__p);
|
|
}
|
|
#endif
|
|
|
|
_LIBCPP_END_NAMESPACE_STD
|
|
|
|
_LIBCPP_POP_MACROS
|
|
|
|
#endif // _LIBCPP___MEMORY_POINTER_TRAITS_H
|