1 | // <scoped_allocator> -*- C++ -*-
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2 |
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3 | // Copyright (C) 2011-2021 Free Software Foundation, Inc.
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4 | //
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5 | // This file is part of the GNU ISO C++ Library. This library is free
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6 | // software; you can redistribute it and/or modify it under the
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7 | // terms of the GNU General Public License as published by the
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8 | // Free Software Foundation; either version 3, or (at your option)
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9 | // any later version.
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10 |
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11 | // This library is distributed in the hope that it will be useful,
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12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 | // GNU General Public License for more details.
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15 |
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16 | // Under Section 7 of GPL version 3, you are granted additional
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17 | // permissions described in the GCC Runtime Library Exception, version
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18 | // 3.1, as published by the Free Software Foundation.
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19 |
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20 | // You should have received a copy of the GNU General Public License and
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21 | // a copy of the GCC Runtime Library Exception along with this program;
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22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 | // <http://www.gnu.org/licenses/>.
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24 |
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25 | /** @file include/scoped_allocator
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26 | * This is a Standard C++ Library header.
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27 | * @ingroup allocators
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28 | */
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29 |
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30 | #ifndef _SCOPED_ALLOCATOR
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31 | #define _SCOPED_ALLOCATOR 1
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32 |
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33 | #pragma GCC system_header
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34 |
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35 | #if __cplusplus < 201103L
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36 | # include <bits/c++0x_warning.h>
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37 | #else
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38 |
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39 | #include <tuple>
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40 | #include <bits/alloc_traits.h>
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41 | #include <bits/stl_pair.h>
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42 | #include <bits/uses_allocator.h>
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43 | #if __cplusplus > 201703L
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44 | # include <bits/uses_allocator_args.h>
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45 | #endif
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46 |
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47 | namespace std _GLIBCXX_VISIBILITY(default)
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48 | {
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49 | _GLIBCXX_BEGIN_NAMESPACE_VERSION
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50 |
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51 | /**
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52 | * @addtogroup allocators
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53 | * @{
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54 | */
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55 |
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56 | /// @cond undocumented
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57 |
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58 | template<typename _Alloc>
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59 | using __outer_allocator_t
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60 | = decltype(std::declval<_Alloc>().outer_allocator());
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61 |
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62 | template<typename _Alloc, typename = void>
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63 | struct __outermost_type
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64 | {
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65 | using type = _Alloc;
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66 | static type& _S_outermost(_Alloc& __a) { return __a; }
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67 | };
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68 |
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69 | template<typename _Alloc>
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70 | struct __outermost_type<_Alloc, __void_t<__outer_allocator_t<_Alloc>>>
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71 | : __outermost_type<
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72 | typename remove_reference<__outer_allocator_t<_Alloc>>::type
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73 | >
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74 | {
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75 | using __base = __outermost_type<
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76 | typename remove_reference<__outer_allocator_t<_Alloc>>::type
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77 | >;
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78 |
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79 | static typename __base::type&
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80 | _S_outermost(_Alloc& __a)
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81 | { return __base::_S_outermost(__a.outer_allocator()); }
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82 | };
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83 |
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84 | /// Implementation of the OUTERMOST pseudofunction
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85 | template<typename _Alloc>
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86 | inline typename __outermost_type<_Alloc>::type&
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87 | __outermost(_Alloc& __a)
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88 | { return __outermost_type<_Alloc>::_S_outermost(__a); }
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89 |
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90 | template<typename _OuterAlloc, typename... _InnerAllocs>
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91 | class scoped_allocator_adaptor;
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92 |
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93 | template<typename...>
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94 | struct __inner_type_impl;
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95 |
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96 | template<typename _Outer>
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97 | struct __inner_type_impl<_Outer>
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98 | {
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99 | typedef scoped_allocator_adaptor<_Outer> __type;
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100 |
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101 | __inner_type_impl() = default;
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102 | __inner_type_impl(const __inner_type_impl&) = default;
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103 | __inner_type_impl(__inner_type_impl&&) = default;
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104 | __inner_type_impl& operator=(const __inner_type_impl&) = default;
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105 | __inner_type_impl& operator=(__inner_type_impl&&) = default;
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106 |
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107 | template<typename _Alloc>
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108 | __inner_type_impl(const __inner_type_impl<_Alloc>& __other)
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109 | { }
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110 |
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111 | template<typename _Alloc>
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112 | __inner_type_impl(__inner_type_impl<_Alloc>&& __other)
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113 | { }
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114 |
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115 | __type&
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116 | _M_get(__type* __p) noexcept { return *__p; }
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117 |
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118 | const __type&
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119 | _M_get(const __type* __p) const noexcept { return *__p; }
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120 |
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121 | tuple<>
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122 | _M_tie() const noexcept { return tuple<>(); }
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123 |
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124 | bool
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125 | operator==(const __inner_type_impl&) const noexcept
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126 | { return true; }
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127 | };
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128 |
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129 | template<typename _Outer, typename _InnerHead, typename... _InnerTail>
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130 | struct __inner_type_impl<_Outer, _InnerHead, _InnerTail...>
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131 | {
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132 | typedef scoped_allocator_adaptor<_InnerHead, _InnerTail...> __type;
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133 |
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134 | __inner_type_impl() = default;
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135 | __inner_type_impl(const __inner_type_impl&) = default;
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136 | __inner_type_impl(__inner_type_impl&&) = default;
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137 | __inner_type_impl& operator=(const __inner_type_impl&) = default;
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138 | __inner_type_impl& operator=(__inner_type_impl&&) = default;
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139 |
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140 | template<typename... _Allocs>
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141 | __inner_type_impl(const __inner_type_impl<_Allocs...>& __other)
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142 | : _M_inner(__other._M_inner) { }
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143 |
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144 | template<typename... _Allocs>
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145 | __inner_type_impl(__inner_type_impl<_Allocs...>&& __other)
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146 | : _M_inner(std::move(__other._M_inner)) { }
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147 |
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148 | template<typename... _Args>
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149 | explicit
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150 | __inner_type_impl(_Args&&... __args)
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151 | : _M_inner(std::forward<_Args>(__args)...) { }
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152 |
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153 | __type&
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154 | _M_get(void*) noexcept { return _M_inner; }
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155 |
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156 | const __type&
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157 | _M_get(const void*) const noexcept { return _M_inner; }
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158 |
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159 | tuple<const _InnerHead&, const _InnerTail&...>
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160 | _M_tie() const noexcept
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161 | { return _M_inner._M_tie(); }
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162 |
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163 | bool
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164 | operator==(const __inner_type_impl& __other) const noexcept
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165 | { return _M_inner == __other._M_inner; }
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166 |
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167 | private:
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168 | template<typename...> friend class __inner_type_impl;
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169 | template<typename, typename...> friend class scoped_allocator_adaptor;
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170 |
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171 | __type _M_inner;
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172 | };
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173 |
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174 | /// @endcond
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175 |
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176 | /// An adaptor to recursively pass an allocator to the objects it constructs
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177 | template<typename _OuterAlloc, typename... _InnerAllocs>
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178 | class scoped_allocator_adaptor
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179 | : public _OuterAlloc
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180 | {
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181 | typedef allocator_traits<_OuterAlloc> __traits;
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182 |
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183 | typedef __inner_type_impl<_OuterAlloc, _InnerAllocs...> __inner_type;
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184 | __inner_type _M_inner;
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185 |
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186 | template<typename _Outer, typename... _Inner>
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187 | friend class scoped_allocator_adaptor;
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188 |
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189 | template<typename...>
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190 | friend class __inner_type_impl;
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191 |
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192 | tuple<const _OuterAlloc&, const _InnerAllocs&...>
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193 | _M_tie() const noexcept
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194 | { return std::tuple_cat(std::tie(outer_allocator()), _M_inner._M_tie()); }
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195 |
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196 | template<typename _Alloc>
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197 | using __outermost_alloc_traits
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198 | = allocator_traits<typename __outermost_type<_Alloc>::type>;
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199 |
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200 | #if ! __cpp_lib_make_obj_using_allocator
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201 | template<typename _Tp, typename... _Args>
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202 | void
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203 | _M_construct(__uses_alloc0, _Tp* __p, _Args&&... __args)
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204 | {
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205 | typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
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206 | _O_traits::construct(__outermost(*this), __p,
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207 | std::forward<_Args>(__args)...);
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208 | }
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209 |
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210 | typedef __uses_alloc1<typename __inner_type::__type> __uses_alloc1_;
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211 | typedef __uses_alloc2<typename __inner_type::__type> __uses_alloc2_;
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212 |
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213 | template<typename _Tp, typename... _Args>
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214 | void
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215 | _M_construct(__uses_alloc1_, _Tp* __p, _Args&&... __args)
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216 | {
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217 | typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
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218 | _O_traits::construct(__outermost(*this), __p,
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219 | allocator_arg, inner_allocator(),
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220 | std::forward<_Args>(__args)...);
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221 | }
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222 |
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223 | template<typename _Tp, typename... _Args>
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224 | void
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225 | _M_construct(__uses_alloc2_, _Tp* __p, _Args&&... __args)
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226 | {
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227 | typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
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228 | _O_traits::construct(__outermost(*this), __p,
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229 | std::forward<_Args>(__args)...,
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230 | inner_allocator());
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231 | }
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232 | #endif // ! make_obj_using_allocator
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233 |
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234 | template<typename _Alloc>
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235 | static _Alloc
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236 | _S_select_on_copy(const _Alloc& __a)
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237 | {
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238 | typedef allocator_traits<_Alloc> __a_traits;
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239 | return __a_traits::select_on_container_copy_construction(__a);
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240 | }
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241 |
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242 | template<std::size_t... _Indices>
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243 | scoped_allocator_adaptor(tuple<const _OuterAlloc&,
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244 | const _InnerAllocs&...> __refs,
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245 | _Index_tuple<_Indices...>)
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246 | : _OuterAlloc(_S_select_on_copy(std::get<0>(__refs))),
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247 | _M_inner(_S_select_on_copy(std::get<_Indices+1>(__refs))...)
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248 | { }
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249 |
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250 | // Used to constrain constructors to disallow invalid conversions.
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251 | template<typename _Alloc>
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252 | using _Constructible = typename enable_if<
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253 | is_constructible<_OuterAlloc, _Alloc>::value
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254 | >::type;
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255 |
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256 | // _GLIBCXX_RESOLVE_LIB_DEFECTS
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257 | // 2975. Missing case for pair construction in scoped [...] allocators
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258 | template<typename _Tp>
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259 | struct __not_pair { using type = void; };
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260 |
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261 | template<typename _Tp, typename _Up>
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262 | struct __not_pair<pair<_Tp, _Up>> { };
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263 |
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264 | public:
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265 | typedef _OuterAlloc outer_allocator_type;
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266 | typedef typename __inner_type::__type inner_allocator_type;
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267 |
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268 | typedef typename __traits::value_type value_type;
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269 | typedef typename __traits::size_type size_type;
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270 | typedef typename __traits::difference_type difference_type;
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271 | typedef typename __traits::pointer pointer;
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272 | typedef typename __traits::const_pointer const_pointer;
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273 | typedef typename __traits::void_pointer void_pointer;
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274 | typedef typename __traits::const_void_pointer const_void_pointer;
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275 |
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276 | typedef typename __or_<
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277 | typename __traits::propagate_on_container_copy_assignment,
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278 | typename allocator_traits<_InnerAllocs>::
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279 | propagate_on_container_copy_assignment...>::type
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280 | propagate_on_container_copy_assignment;
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281 |
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282 | typedef typename __or_<
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283 | typename __traits::propagate_on_container_move_assignment,
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284 | typename allocator_traits<_InnerAllocs>::
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285 | propagate_on_container_move_assignment...>::type
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286 | propagate_on_container_move_assignment;
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287 |
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288 | typedef typename __or_<
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289 | typename __traits::propagate_on_container_swap,
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290 | typename allocator_traits<_InnerAllocs>::
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291 | propagate_on_container_swap...>::type
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292 | propagate_on_container_swap;
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293 |
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294 | typedef typename __and_<
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295 | typename __traits::is_always_equal,
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296 | typename allocator_traits<_InnerAllocs>::is_always_equal...>::type
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297 | is_always_equal;
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298 |
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299 | template <class _Tp>
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300 | struct rebind
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301 | {
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302 | typedef scoped_allocator_adaptor<
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303 | typename __traits::template rebind_alloc<_Tp>,
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304 | _InnerAllocs...> other;
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305 | };
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306 |
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307 | scoped_allocator_adaptor() : _OuterAlloc(), _M_inner() { }
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308 |
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309 | template<typename _Outer2, typename = _Constructible<_Outer2>>
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310 | scoped_allocator_adaptor(_Outer2&& __outer,
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311 | const _InnerAllocs&... __inner)
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312 | : _OuterAlloc(std::forward<_Outer2>(__outer)),
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313 | _M_inner(__inner...)
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314 | { }
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315 |
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316 | scoped_allocator_adaptor(const scoped_allocator_adaptor& __other)
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317 | : _OuterAlloc(__other.outer_allocator()),
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318 | _M_inner(__other._M_inner)
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319 | { }
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320 |
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321 | scoped_allocator_adaptor(scoped_allocator_adaptor&& __other)
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322 | : _OuterAlloc(std::move(__other.outer_allocator())),
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323 | _M_inner(std::move(__other._M_inner))
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324 | { }
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325 |
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326 | template<typename _Outer2, typename = _Constructible<const _Outer2&>>
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327 | scoped_allocator_adaptor(
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328 | const scoped_allocator_adaptor<_Outer2, _InnerAllocs...>& __other)
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329 | : _OuterAlloc(__other.outer_allocator()),
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330 | _M_inner(__other._M_inner)
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331 | { }
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332 |
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333 | template<typename _Outer2, typename = _Constructible<_Outer2>>
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334 | scoped_allocator_adaptor(
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335 | scoped_allocator_adaptor<_Outer2, _InnerAllocs...>&& __other)
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336 | : _OuterAlloc(std::move(__other.outer_allocator())),
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337 | _M_inner(std::move(__other._M_inner))
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338 | { }
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339 |
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340 | scoped_allocator_adaptor&
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341 | operator=(const scoped_allocator_adaptor&) = default;
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342 |
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343 | scoped_allocator_adaptor&
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344 | operator=(scoped_allocator_adaptor&&) = default;
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345 |
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346 | inner_allocator_type& inner_allocator() noexcept
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347 | { return _M_inner._M_get(this); }
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348 |
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349 | const inner_allocator_type& inner_allocator() const noexcept
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350 | { return _M_inner._M_get(this); }
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351 |
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352 | outer_allocator_type& outer_allocator() noexcept
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353 | { return static_cast<_OuterAlloc&>(*this); }
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354 |
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355 | const outer_allocator_type& outer_allocator() const noexcept
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356 | { return static_cast<const _OuterAlloc&>(*this); }
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357 |
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358 | _GLIBCXX_NODISCARD pointer allocate(size_type __n)
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359 | { return __traits::allocate(outer_allocator(), __n); }
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360 |
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361 | _GLIBCXX_NODISCARD pointer allocate(size_type __n, const_void_pointer __hint)
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362 | { return __traits::allocate(outer_allocator(), __n, __hint); }
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363 |
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364 | void deallocate(pointer __p, size_type __n)
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365 | { return __traits::deallocate(outer_allocator(), __p, __n); }
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366 |
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367 | size_type max_size() const
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368 | { return __traits::max_size(outer_allocator()); }
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369 |
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370 | #if ! __cpp_lib_make_obj_using_allocator
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371 | template<typename _Tp, typename... _Args>
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372 | typename __not_pair<_Tp>::type
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373 | construct(_Tp* __p, _Args&&... __args)
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374 | {
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375 | auto& __inner = inner_allocator();
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376 | auto __use_tag
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377 | = std::__use_alloc<_Tp, inner_allocator_type, _Args...>(__inner);
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378 | _M_construct(__use_tag, __p, std::forward<_Args>(__args)...);
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379 | }
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380 |
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381 | template<typename _T1, typename _T2, typename... _Args1,
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382 | typename... _Args2>
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383 | void
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384 | construct(pair<_T1, _T2>* __p, piecewise_construct_t,
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385 | tuple<_Args1...> __x, tuple<_Args2...> __y)
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386 | {
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387 | // _GLIBCXX_RESOLVE_LIB_DEFECTS
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388 | // 2203. wrong argument types for piecewise construction
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389 | auto& __inner = inner_allocator();
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390 | auto __x_use_tag
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391 | = std::__use_alloc<_T1, inner_allocator_type, _Args1...>(__inner);
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392 | auto __y_use_tag
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393 | = std::__use_alloc<_T2, inner_allocator_type, _Args2...>(__inner);
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394 | typename _Build_index_tuple<sizeof...(_Args1)>::__type __x_indices;
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395 | typename _Build_index_tuple<sizeof...(_Args2)>::__type __y_indices;
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396 | typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
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397 | _O_traits::construct(__outermost(*this), __p, piecewise_construct,
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398 | _M_construct_p(__x_use_tag, __x_indices, __x),
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399 | _M_construct_p(__y_use_tag, __y_indices, __y));
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400 | }
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401 |
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402 | template<typename _T1, typename _T2>
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403 | void
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404 | construct(pair<_T1, _T2>* __p)
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405 | { construct(__p, piecewise_construct, tuple<>(), tuple<>()); }
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406 |
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407 | template<typename _T1, typename _T2, typename _Up, typename _Vp>
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408 | void
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409 | construct(pair<_T1, _T2>* __p, _Up&& __u, _Vp&& __v)
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410 | {
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411 | construct(__p, piecewise_construct,
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412 | std::forward_as_tuple(std::forward<_Up>(__u)),
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413 | std::forward_as_tuple(std::forward<_Vp>(__v)));
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414 | }
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415 |
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416 | template<typename _T1, typename _T2, typename _Up, typename _Vp>
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417 | void
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418 | construct(pair<_T1, _T2>* __p, const pair<_Up, _Vp>& __x)
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419 | {
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420 | construct(__p, piecewise_construct,
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421 | std::forward_as_tuple(__x.first),
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422 | std::forward_as_tuple(__x.second));
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423 | }
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424 |
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425 | template<typename _T1, typename _T2, typename _Up, typename _Vp>
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426 | void
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427 | construct(pair<_T1, _T2>* __p, pair<_Up, _Vp>&& __x)
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428 | {
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429 | construct(__p, piecewise_construct,
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430 | std::forward_as_tuple(std::forward<_Up>(__x.first)),
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431 | std::forward_as_tuple(std::forward<_Vp>(__x.second)));
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432 | }
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433 | #else // make_obj_using_allocator
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434 | template<typename _Tp, typename... _Args>
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435 | __attribute__((__nonnull__))
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436 | void
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437 | construct(_Tp* __p, _Args&&... __args)
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438 | {
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439 | typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
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440 | std::apply([__p, this](auto&&... __newargs) {
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441 | _O_traits::construct(__outermost(*this), __p,
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442 | std::forward<decltype(__newargs)>(__newargs)...);
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443 | },
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444 | uses_allocator_construction_args<_Tp>(inner_allocator(),
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445 | std::forward<_Args>(__args)...));
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446 | }
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447 | #endif
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448 |
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449 | template<typename _Tp>
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450 | void destroy(_Tp* __p)
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451 | {
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452 | typedef __outermost_alloc_traits<scoped_allocator_adaptor> _O_traits;
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453 | _O_traits::destroy(__outermost(*this), __p);
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454 | }
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455 |
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456 | scoped_allocator_adaptor
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457 | select_on_container_copy_construction() const
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458 | {
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459 | typedef typename _Build_index_tuple<sizeof...(_InnerAllocs)>::__type
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460 | _Indices;
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461 | return scoped_allocator_adaptor(_M_tie(), _Indices());
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462 | }
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463 |
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464 | template <typename _OutA1, typename _OutA2, typename... _InA>
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465 | friend bool
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466 | operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
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467 | const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept;
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468 |
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469 | private:
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470 | #if ! __cpp_lib_make_obj_using_allocator
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471 | template<typename _Ind, typename... _Args>
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472 | tuple<_Args&&...>
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473 | _M_construct_p(__uses_alloc0, _Ind, tuple<_Args...>& __t)
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474 | { return std::move(__t); }
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475 |
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476 | template<size_t... _Ind, typename... _Args>
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477 | tuple<allocator_arg_t, inner_allocator_type&, _Args&&...>
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478 | _M_construct_p(__uses_alloc1_, _Index_tuple<_Ind...>,
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479 | tuple<_Args...>& __t)
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480 | {
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481 | return { allocator_arg, inner_allocator(),
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482 | std::get<_Ind>(std::move(__t))...
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483 | };
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484 | }
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485 |
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486 | template<size_t... _Ind, typename... _Args>
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487 | tuple<_Args&&..., inner_allocator_type&>
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488 | _M_construct_p(__uses_alloc2_, _Index_tuple<_Ind...>,
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489 | tuple<_Args...>& __t)
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490 | {
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491 | return { std::get<_Ind>(std::move(__t))..., inner_allocator() };
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492 | }
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493 | #endif // ! make_obj_using_allocator
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494 | };
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495 |
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496 | /// @related std::scoped_allocator_adaptor
|
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497 | template <typename _OutA1, typename _OutA2, typename... _InA>
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498 | inline bool
|
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499 | operator==(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
|
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500 | const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept
|
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501 | {
|
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502 | return __a.outer_allocator() == __b.outer_allocator()
|
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503 | && __a._M_inner == __b._M_inner;
|
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504 | }
|
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505 |
|
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506 | #if __cpp_impl_three_way_comparison < 201907L
|
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507 | /// @related std::scoped_allocator_adaptor
|
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508 | template <typename _OutA1, typename _OutA2, typename... _InA>
|
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509 | inline bool
|
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510 | operator!=(const scoped_allocator_adaptor<_OutA1, _InA...>& __a,
|
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511 | const scoped_allocator_adaptor<_OutA2, _InA...>& __b) noexcept
|
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512 | { return !(__a == __b); }
|
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513 | #endif
|
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514 |
|
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515 | /// @}
|
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516 |
|
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517 | _GLIBCXX_END_NAMESPACE_VERSION
|
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518 | } // namespace
|
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519 |
|
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520 | #endif // C++11
|
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521 |
|
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522 | #endif // _SCOPED_ALLOCATOR
|
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