contrib/gcc-8.0/libstdc++-v3/include/ext/alloc_traits.h

   1 // Allocator traits -*- C++ -*-
   2
   3 // Copyright (C) 2011-2018 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /** @file ext/alloc_traits.h
  26  *  This file is a GNU extension to the Standard C++ Library.
  27  */
  28
  29 #ifndef _EXT_ALLOC_TRAITS_H
  30 #define _EXT_ALLOC_TRAITS_H 1
  31
  32 #pragma GCC system_header
  33
  34 #if __cplusplus >= 201103L
  35 # include <bits/move.h>
  36 # include <bits/alloc_traits.h>
  37 #else
  38 # include <bits/allocator.h>  // for __alloc_swap
  39 #endif
  40
  41 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  42 {
  43 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  44
  45 /**
  46  * @brief  Uniform interface to C++98 and C++11 allocators.
  47  * @ingroup allocators
  48 */
  49 template<typename _Alloc, typename = typename _Alloc::value_type>
  50   struct __alloc_traits
  51 #if __cplusplus >= 201103L
  52   : std::allocator_traits<_Alloc>
  53 #endif
  54   {
  55     typedef _Alloc allocator_type;
  56 #if __cplusplus >= 201103L
  57     typedef std::allocator_traits<_Alloc>           _Base_type;
  58     typedef typename _Base_type::value_type         value_type;
  59     typedef typename _Base_type::pointer            pointer;
  60     typedef typename _Base_type::const_pointer      const_pointer;
  61     typedef typename _Base_type::size_type          size_type;
  62     typedef typename _Base_type::difference_type    difference_type;
  63     // C++11 allocators do not define reference or const_reference
  64     typedef value_type&                             reference;
  65     typedef const value_type&                       const_reference;
  66     using _Base_type::allocate;
  67     using _Base_type::deallocate;
  68     using _Base_type::construct;
  69     using _Base_type::destroy;
  70     using _Base_type::max_size;
  71
  72   private:
  73     template<typename _Ptr>
  74       using __is_custom_pointer
  75         = std::__and_<std::is_same<pointer, _Ptr>,
  76                       std::__not_<std::is_pointer<_Ptr>>>;
  77
  78   public:
  79     // overload construct for non-standard pointer types
  80     template<typename _Ptr, typename... _Args>
  81       static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
  82       construct(_Alloc& __a, _Ptr __p, _Args&&... __args)
  83       {
  84         _Base_type::construct(__a, std::__to_address(__p),
  85                               std::forward<_Args>(__args)...);
  86       }
  87
  88     // overload destroy for non-standard pointer types
  89     template<typename _Ptr>
  90       static typename std::enable_if<__is_custom_pointer<_Ptr>::value>::type
  91       destroy(_Alloc& __a, _Ptr __p)
  92       { _Base_type::destroy(__a, std::__to_address(__p)); }
  93
  94     static _Alloc _S_select_on_copy(const _Alloc& __a)
  95     { return _Base_type::select_on_container_copy_construction(__a); }
  96
  97     static void _S_on_swap(_Alloc& __a, _Alloc& __b)
  98     { std::__alloc_on_swap(__a, __b); }
  99
 100     static constexpr bool _S_propagate_on_copy_assign()
 101     { return _Base_type::propagate_on_container_copy_assignment::value; }
 102
 103     static constexpr bool _S_propagate_on_move_assign()
 104     { return _Base_type::propagate_on_container_move_assignment::value; }
 105
 106     static constexpr bool _S_propagate_on_swap()
 107     { return _Base_type::propagate_on_container_swap::value; }
 108
 109     static constexpr bool _S_always_equal()
 110     { return _Base_type::is_always_equal::value; }
 111
 112     static constexpr bool _S_nothrow_move()
 113     { return _S_propagate_on_move_assign() || _S_always_equal(); }
 114
 115     template<typename _Tp>
 116       struct rebind
 117       { typedef typename _Base_type::template rebind_alloc<_Tp> other; };
 118 #else
 119
 120     typedef typename _Alloc::pointer                pointer;
 121     typedef typename _Alloc::const_pointer          const_pointer;
 122     typedef typename _Alloc::value_type             value_type;
 123     typedef typename _Alloc::reference              reference;
 124     typedef typename _Alloc::const_reference        const_reference;
 125     typedef typename _Alloc::size_type              size_type;
 126     typedef typename _Alloc::difference_type        difference_type;
 127
 128     static pointer
 129     allocate(_Alloc& __a, size_type __n)
 130     { return __a.allocate(__n); }
 131
 132     static void deallocate(_Alloc& __a, pointer __p, size_type __n)
 133     { __a.deallocate(__p, __n); }
 134
 135     template<typename _Tp>
 136       static void construct(_Alloc& __a, pointer __p, const _Tp& __arg)
 137       { __a.construct(__p, __arg); }
 138
 139     static void destroy(_Alloc& __a, pointer __p)
 140     { __a.destroy(__p); }
 141
 142     static size_type max_size(const _Alloc& __a)
 143     { return __a.max_size(); }
 144
 145     static const _Alloc& _S_select_on_copy(const _Alloc& __a) { return __a; }
 146
 147     static void _S_on_swap(_Alloc& __a, _Alloc& __b)
 148     {
 149       // _GLIBCXX_RESOLVE_LIB_DEFECTS
 150       // 431. Swapping containers with unequal allocators.
 151       std::__alloc_swap<_Alloc>::_S_do_it(__a, __b);
 152     }
 153
 154     template<typename _Tp>
 155       struct rebind
 156       { typedef typename _Alloc::template rebind<_Tp>::other other; };
 157 #endif
 158   };
 159
 160 _GLIBCXX_END_NAMESPACE_VERSION
 161 } // namespace __gnu_cxx
 162
 163 #endif