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// Pointer Traits -*- C++ -*- // Copyright (C) 2011-2023 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/ptr_traits.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{memory} */ #ifndef _PTR_TRAITS_H #define _PTR_TRAITS_H 1 #if __cplusplus >= 201103L #include <bits/move.h> /* Duplicate definition with unique_ptr.h. */ #if __cplusplus > 202002L && defined(__cpp_constexpr_dynamic_alloc) # define __cpp_lib_constexpr_memory 202202L #elif __cplusplus > 201703L # define __cpp_lib_constexpr_memory 201811L #endif #if __cplusplus > 201703L #include <concepts> namespace __gnu_debug { struct _Safe_iterator_base; } #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /// @cond undocumented class __undefined; // For a specialization `SomeTemplate<T, Types...>` the member `type` is T, // otherwise `type` is `__undefined`. template<typename _Tp> struct __get_first_arg { using type = __undefined; }; template<template<typename, typename...> class _SomeTemplate, typename _Tp, typename... _Types> struct __get_first_arg<_SomeTemplate<_Tp, _Types...>> { using type = _Tp; }; // For a specialization `SomeTemplate<T, Args...>` and a type `U` the member // `type` is `SomeTemplate<U, Args...>`, otherwise there is no member `type`. template<typename _Tp, typename _Up> struct __replace_first_arg { }; template<template<typename, typename...> class _SomeTemplate, typename _Up, typename _Tp, typename... _Types> struct __replace_first_arg<_SomeTemplate<_Tp, _Types...>, _Up> { using type = _SomeTemplate<_Up, _Types...>; }; // Detect the element type of a pointer-like type. template<typename _Ptr, typename = void> struct __ptr_traits_elem : __get_first_arg<_Ptr> { }; // Use _Ptr::element_type if is a valid type. #if __cpp_concepts template<typename _Ptr> requires requires { typename _Ptr::element_type; } struct __ptr_traits_elem<_Ptr, void> { using type = typename _Ptr::element_type; }; #else template<typename _Ptr> struct __ptr_traits_elem<_Ptr, __void_t<typename _Ptr::element_type>> { using type = typename _Ptr::element_type; }; #endif template<typename _Ptr> using __ptr_traits_elem_t = typename __ptr_traits_elem<_Ptr>::type; /// @endcond // Define pointer_traits<P>::pointer_to. template<typename _Ptr, typename _Elt, bool = is_void<_Elt>::value> struct __ptr_traits_ptr_to { using pointer = _Ptr; using element_type = _Elt; /** * @brief Obtain a pointer to an object * @param __r A reference to an object of type `element_type` * @return `pointer::pointer_to(__r)` * @pre `pointer::pointer_to(__r)` is a valid expression. */ static pointer pointer_to(element_type& __r) #if __cpp_lib_concepts requires requires { { pointer::pointer_to(__r) } -> convertible_to<pointer>; } #endif { return pointer::pointer_to(__r); } }; // Do not define pointer_traits<P>::pointer_to if element type is void. template<typename _Ptr, typename _Elt> struct __ptr_traits_ptr_to<_Ptr, _Elt, true> { }; // Partial specialization defining pointer_traits<T*>::pointer_to(T&). template<typename _Tp> struct __ptr_traits_ptr_to<_Tp*, _Tp, false> { using pointer = _Tp*; using element_type = _Tp; /** * @brief Obtain a pointer to an object * @param __r A reference to an object of type `element_type` * @return `addressof(__r)` */ static _GLIBCXX20_CONSTEXPR pointer pointer_to(element_type& __r) noexcept { return std::addressof(__r); } }; template<typename _Ptr, typename _Elt> struct __ptr_traits_impl : __ptr_traits_ptr_to<_Ptr, _Elt> { private: template<typename _Tp> using __diff_t = typename _Tp::difference_type; template<typename _Tp, typename _Up> using __rebind = __type_identity<typename _Tp::template rebind<_Up>>; public: /// The pointer type. using pointer = _Ptr; /// The type pointed to. using element_type = _Elt; /// The type used to represent the difference between two pointers. using difference_type = __detected_or_t<ptrdiff_t, __diff_t, _Ptr>; /// A pointer to a different type. template<typename _Up> using rebind = typename __detected_or_t<__replace_first_arg<_Ptr, _Up>, __rebind, _Ptr, _Up>::type; }; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3545. std::pointer_traits should be SFINAE-friendly template<typename _Ptr> struct __ptr_traits_impl<_Ptr, __undefined> { }; /** * @brief Uniform interface to all pointer-like types * @headerfile memory * @ingroup pointer_abstractions * @since C++11 */ template<typename _Ptr> struct pointer_traits : __ptr_traits_impl<_Ptr, __ptr_traits_elem_t<_Ptr>> { }; /** * @brief Partial specialization for built-in pointers. * @headerfile memory * @ingroup pointer_abstractions * @since C++11 */ template<typename _Tp> struct pointer_traits<_Tp*> : __ptr_traits_ptr_to<_Tp*, _Tp> { /// The pointer type typedef _Tp* pointer; /// The type pointed to typedef _Tp element_type; /// Type used to represent the difference between two pointers typedef ptrdiff_t difference_type; /// A pointer to a different type. template<typename _Up> using rebind = _Up*; }; /// Convenience alias for rebinding pointers. template<typename _Ptr, typename _Tp> using __ptr_rebind = typename pointer_traits<_Ptr>::template rebind<_Tp>; template<typename _Tp> constexpr _Tp* __to_address(_Tp* __ptr) noexcept { static_assert(!std::is_function<_Tp>::value, "not a function pointer"); return __ptr; } #if __cplusplus <= 201703L template<typename _Ptr> constexpr typename std::pointer_traits<_Ptr>::element_type* __to_address(const _Ptr& __ptr) { return std::__to_address(__ptr.operator->()); } #else template<typename _Ptr> constexpr auto __to_address(const _Ptr& __ptr) noexcept -> decltype(std::pointer_traits<_Ptr>::to_address(__ptr)) { return std::pointer_traits<_Ptr>::to_address(__ptr); } template<typename _Ptr, typename... _None> constexpr auto __to_address(const _Ptr& __ptr, _None...) noexcept { if constexpr (is_base_of_v<__gnu_debug::_Safe_iterator_base, _Ptr>) return std::__to_address(__ptr.base().operator->()); else return std::__to_address(__ptr.operator->()); } #define __cpp_lib_to_address 201711L /** * @brief Obtain address referenced by a pointer to an object * @param __ptr A pointer to an object * @return @c __ptr * @ingroup pointer_abstractions */ template<typename _Tp> constexpr _Tp* to_address(_Tp* __ptr) noexcept { return std::__to_address(__ptr); } /** * @brief Obtain address referenced by a pointer to an object * @param __ptr A pointer to an object * @return @c pointer_traits<_Ptr>::to_address(__ptr) if that expression is well-formed, otherwise @c to_address(__ptr.operator->()) * @ingroup pointer_abstractions */ template<typename _Ptr> constexpr auto to_address(const _Ptr& __ptr) noexcept { return std::__to_address(__ptr); } #endif // C++2a _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif #endif