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1 // Allocator that wraps operator new -*- C++ -*-
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2
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145
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3 // Copyright (C) 2001-2020 Free Software Foundation, Inc.
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111
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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 ext/new_allocator.h
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26 * This file is a GNU extension to the Standard C++ Library.
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27 */
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28
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29 #ifndef _NEW_ALLOCATOR_H
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30 #define _NEW_ALLOCATOR_H 1
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31
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32 #include <bits/c++config.h>
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33 #include <new>
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34 #include <bits/functexcept.h>
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35 #include <bits/move.h>
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36 #if __cplusplus >= 201103L
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37 #include <type_traits>
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38 #endif
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39
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40 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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41 {
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42 _GLIBCXX_BEGIN_NAMESPACE_VERSION
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43
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44 /**
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45 * @brief An allocator that uses global new, as per [20.4].
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46 * @ingroup allocators
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47 *
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48 * This is precisely the allocator defined in the C++ Standard.
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49 * - all allocation calls operator new
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50 * - all deallocation calls operator delete
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51 *
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52 * @tparam _Tp Type of allocated object.
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53 */
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54 template<typename _Tp>
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55 class new_allocator
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56 {
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57 public:
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58 typedef _Tp value_type;
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59 typedef std::size_t size_type;
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60 typedef std::ptrdiff_t difference_type;
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61 #if __cplusplus <= 201703L
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62 typedef _Tp* pointer;
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63 typedef const _Tp* const_pointer;
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64 typedef _Tp& reference;
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65 typedef const _Tp& const_reference;
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66
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67 template<typename _Tp1>
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68 struct rebind
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69 { typedef new_allocator<_Tp1> other; };
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70 #endif
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71
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72 #if __cplusplus >= 201103L
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73 // _GLIBCXX_RESOLVE_LIB_DEFECTS
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74 // 2103. propagate_on_container_move_assignment
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75 typedef std::true_type propagate_on_container_move_assignment;
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76 #endif
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77
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78 _GLIBCXX20_CONSTEXPR
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79 new_allocator() _GLIBCXX_USE_NOEXCEPT { }
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80
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81 _GLIBCXX20_CONSTEXPR
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82 new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }
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83
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84 template<typename _Tp1>
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85 _GLIBCXX20_CONSTEXPR
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86 new_allocator(const new_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { }
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87
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88 #if __cplusplus <= 201703L
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89 ~new_allocator() _GLIBCXX_USE_NOEXCEPT { }
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90
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91 pointer
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92 address(reference __x) const _GLIBCXX_NOEXCEPT
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93 { return std::__addressof(__x); }
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94
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95 const_pointer
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96 address(const_reference __x) const _GLIBCXX_NOEXCEPT
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97 { return std::__addressof(__x); }
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98 #endif
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99
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100 // NB: __n is permitted to be 0. The C++ standard says nothing
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101 // about what the return value is when __n == 0.
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102 _GLIBCXX_NODISCARD _Tp*
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103 allocate(size_type __n, const void* = static_cast<const void*>(0))
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104 {
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105 if (__n > this->_M_max_size())
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106 std::__throw_bad_alloc();
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107
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108 #if __cpp_aligned_new
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109 if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
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110 {
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111 std::align_val_t __al = std::align_val_t(alignof(_Tp));
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112 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp), __al));
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113 }
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114 #endif
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115 return static_cast<_Tp*>(::operator new(__n * sizeof(_Tp)));
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116 }
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117
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118 // __p is not permitted to be a null pointer.
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119 void
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120 deallocate(_Tp* __p, size_type __t)
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121 {
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122 #if __cpp_aligned_new
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123 if (alignof(_Tp) > __STDCPP_DEFAULT_NEW_ALIGNMENT__)
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124 {
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125 ::operator delete(__p,
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126 # if __cpp_sized_deallocation
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127 __t * sizeof(_Tp),
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128 # endif
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129 std::align_val_t(alignof(_Tp)));
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130 return;
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131 }
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132 #endif
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133 ::operator delete(__p
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134 #if __cpp_sized_deallocation
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135 , __t * sizeof(_Tp)
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136 #endif
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137 );
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138 }
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139
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140 #if __cplusplus <= 201703L
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141 size_type
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142 max_size() const _GLIBCXX_USE_NOEXCEPT
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145
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143 { return _M_max_size(); }
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144
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145 #if __cplusplus >= 201103L
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146 template<typename _Up, typename... _Args>
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147 void
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148 construct(_Up* __p, _Args&&... __args)
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145
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149 noexcept(noexcept(::new((void *)__p)
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150 _Up(std::forward<_Args>(__args)...)))
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151 { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
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152
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153 template<typename _Up>
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154 void
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155 destroy(_Up* __p)
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156 noexcept(noexcept( __p->~_Up()))
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157 { __p->~_Up(); }
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158 #else
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159 // _GLIBCXX_RESOLVE_LIB_DEFECTS
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160 // 402. wrong new expression in [some_] allocator::construct
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161 void
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162 construct(pointer __p, const _Tp& __val)
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163 { ::new((void *)__p) _Tp(__val); }
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164
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165 void
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166 destroy(pointer __p) { __p->~_Tp(); }
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167 #endif
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168 #endif // ! C++20
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169
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170 template<typename _Up>
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171 friend _GLIBCXX20_CONSTEXPR bool
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172 operator==(const new_allocator&, const new_allocator<_Up>&)
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173 _GLIBCXX_NOTHROW
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174 { return true; }
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175
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176 template<typename _Up>
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177 friend _GLIBCXX20_CONSTEXPR bool
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178 operator!=(const new_allocator&, const new_allocator<_Up>&)
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179 _GLIBCXX_NOTHROW
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180 { return false; }
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181
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182 private:
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183 _GLIBCXX_CONSTEXPR size_type
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184 _M_max_size() const _GLIBCXX_USE_NOEXCEPT
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185 {
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186 #if __PTRDIFF_MAX__ < __SIZE_MAX__
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187 return std::size_t(__PTRDIFF_MAX__) / sizeof(_Tp);
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188 #else
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189 return std::size_t(-1) / sizeof(_Tp);
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190 #endif
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191 }
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131
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192 };
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193
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194 _GLIBCXX_END_NAMESPACE_VERSION
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195 } // namespace
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196
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197 #endif
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