ptr_traits.h

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// Pointer Traits -*- C++ -*-
 
// Copyright (C) 2011-2021 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>
 
#if __cplusplus > 201703L
#define __cpp_lib_constexpr_memory 201811L
namespace __gnu_debug { struct _Safe_iterator_base; }
#endif
 
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
 
  class __undefined;
 
  // Given Template<T, ...> and U return Template<U, ...>, otherwise invalid.
  template<typename _Tp, typename _Up>
    struct __replace_first_arg
    { };
 
  template<template<typename, typename...> class _Template, typename _Up,
           typename _Tp, typename... _Types>
    struct __replace_first_arg<_Template<_Tp, _Types...>, _Up>
    { using type = _Template<_Up, _Types...>; };
 
  template<typename _Tp, typename _Up>
    using __replace_first_arg_t = typename __replace_first_arg<_Tp, _Up>::type;
 
  template<typename _Tp>
    using __make_not_void
      = typename conditional<is_void<_Tp>::value, __undefined, _Tp>::type;
 
  template<typename _Ptr>
    struct __ptr_traits_elem_1
    { };
 
  template<template<typename, typename...> class _SomePointer, typename _Tp,
           typename... _Args>
    struct __ptr_traits_elem_1<_SomePointer<_Tp, _Args...>>
    {
      using element_type = _Tp;
      using pointer = _SomePointer<_Tp, _Args...>;
 
      static pointer
      pointer_to(__make_not_void<element_type>& __e)
      { return pointer::pointer_to(__e); }
    };
 
  template<typename _Ptr, typename = void>
    struct __ptr_traits_elem : __ptr_traits_elem_1<_Ptr>
    { };
 
  template<typename _Ptr>
    struct __ptr_traits_elem<_Ptr, __void_t<typename _Ptr::element_type>>
    {
      using element_type = typename _Ptr::element_type;
 
      static _Ptr
      pointer_to(__make_not_void<element_type>& __e)
      { return _Ptr::pointer_to(__e); }
    };
 
  /**
   * @brief  Uniform interface to all pointer-like types
   * @ingroup pointer_abstractions
  */
  template<typename _Ptr>
    struct pointer_traits : __ptr_traits_elem<_Ptr>
    {
    private:
      template<typename _Tp>
        using __difference_type = typename _Tp::difference_type;
 
      template<typename _Tp, typename _Up, typename = void>
        struct __rebind : __replace_first_arg<_Tp, _Up> { };
 
      template<typename _Tp, typename _Up>
        struct __rebind<_Tp, _Up, __void_t<typename _Tp::template rebind<_Up>>>
        { using type = typename _Tp::template rebind<_Up>; };
 
    public:
      /// The pointer type.
      using pointer = _Ptr;
 
      /// The type used to represent the difference between two pointers.
      using difference_type
        = __detected_or_t<ptrdiff_t, __difference_type, _Ptr>;
 
      /// A pointer to a different type.
      template<typename _Up>
        using rebind = typename __rebind<_Ptr, _Up>::type;
    };
 
  /**
   * @brief  Partial specialization for built-in pointers.
   * @ingroup pointer_abstractions
  */
  template<typename _Tp>
    struct pointer_traits<_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;
 
      template<typename _Up>
        using rebind = _Up*;
 
      /**
       *  @brief  Obtain a pointer to an object
       *  @param  __r  A reference to an object of type @c element_type
       *  @return @c addressof(__r)
      */
      static _GLIBCXX20_CONSTEXPR pointer
      pointer_to(__make_not_void<element_type>& __r) noexcept
      { return std::addressof(__r); }
    };
 
  /// 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