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File ptr_traits.h

// Pointer Traits -*- C++ -*-

// Copyright (C) 2011-2018 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
namespace __gnu_debug { struct _Safe_iterator_base; }
#endif

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

class __undefined;

// Given Template<T, ...> return T, otherwise invalid.
  template<typename _Tp>
    struct __get_first_arg
    { using type = __undefined; };

template<template<typename, typename...> class _Template, typename _Tp,
           typename... _Types>
    struct __get_first_arg<_Template<_Tp, _Types...>>
    { using type = _Tp; };

template<typename _Tp>
    using __get_first_arg_t = typename __get_first_arg<_Tp>::type;

// 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;

/**
   * @brief  Uniform interface to all pointer-like types
   * @ingroup pointer_abstractions
  */
  template<typename _Ptr>
    struct pointer_traits
    {
    private:
      template<typename _Tp>
	using __element_type = typename _Tp::element_type;

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 pointed to.
      using element_type
	= __detected_or_t<__get_first_arg_t<_Ptr>, __element_type, _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;

static _Ptr
      pointer_to(__make_not_void<element_type>& __e)
      { return _Ptr::pointer_to(__e); }

static_assert(!is_same<element_type, __undefined>::value,
	  "pointer type defines element_type or is like SomePointer<T, Args>");
    };

/**
   * @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 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->());
    }

/**
   * @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

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algorithmfwd.h	text/x-c	21.23 KB	-rw-r--r--	2025-08-26 09:45:00
alloc_traits.h	text/x-c	19.6 KB	-rw-r--r--	2025-08-26 09:45:00
allocated_ptr.h	text/plain	3.22 KB	-rw-r--r--	2025-08-26 09:45:00
allocator.h	text/x-c	7.39 KB	-rw-r--r--	2025-08-26 09:45:00
atomic_base.h	text/x-c	23.28 KB	-rw-r--r--	2025-08-26 09:45:00
atomic_futex.h	text/x-c	9.35 KB	-rw-r--r--	2025-08-26 09:45:00
atomic_lockfree_defines.h	text/plain	2.2 KB	-rw-r--r--	2025-08-26 09:45:07
basic_ios.h	text/x-c	15.7 KB	-rw-r--r--	2025-08-26 09:45:00
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basic_string.tcc	text/x-c	52.5 KB	-rw-r--r--	2025-08-26 09:45:00
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c++0x_warning.h	text/plain	1.44 KB	-rw-r--r--	2025-08-26 09:45:00
char_traits.h	text/x-c	20.42 KB	-rw-r--r--	2025-08-26 09:45:00
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vector.tcc	text/plain	28.95 KB	-rw-r--r--	2025-08-26 09:45:00

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