1 | /* Copyright 2003-2009 Joaquin M Lopez Munoz. |
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2 | * Distributed under the Boost Software License, Version 1.0. |
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3 | * (See accompanying file LICENSE_1_0.txt or copy at |
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4 | * http://www.boost.org/LICENSE_1_0.txt) |
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5 | * |
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6 | * See Boost website at http://www.boost.org/ |
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7 | */ |
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8 | |
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9 | #ifndef BOOST_DETAIL_ALLOCATOR_UTILITIES_HPP |
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10 | #define BOOST_DETAIL_ALLOCATOR_UTILITIES_HPP |
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11 | |
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12 | #include <boost/config.hpp> /* keep it first to prevent nasty warns in MSVC */ |
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13 | #include <boost/detail/workaround.hpp> |
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14 | #include <boost/mpl/aux_/msvc_never_true.hpp> |
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15 | #include <boost/mpl/eval_if.hpp> |
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16 | #include <boost/type_traits/is_same.hpp> |
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17 | #include <cstddef> |
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18 | #include <memory> |
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19 | #include <new> |
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20 | |
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21 | namespace boost{ |
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22 | |
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23 | namespace detail{ |
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24 | |
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25 | /* Allocator adaption layer. Some stdlibs provide allocators without rebind |
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26 | * and template ctors. These facilities are simulated with the external |
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27 | * template class rebind_to and the aid of partial_std_allocator_wrapper. |
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28 | */ |
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29 | |
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30 | namespace allocator{ |
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31 | |
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32 | /* partial_std_allocator_wrapper inherits the functionality of a std |
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33 | * allocator while providing a templatized ctor and other bits missing |
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34 | * in some stdlib implementation or another. |
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35 | */ |
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36 | |
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37 | template<typename Type> |
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38 | class partial_std_allocator_wrapper:public std::allocator<Type> |
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39 | { |
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40 | public: |
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41 | /* Oddly enough, STLport does not define std::allocator<void>::value_type |
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42 | * when configured to work without partial template specialization. |
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43 | * No harm in supplying the definition here unconditionally. |
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44 | */ |
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45 | |
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46 | typedef Type value_type; |
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47 | |
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48 | partial_std_allocator_wrapper(){}; |
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49 | |
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50 | template<typename Other> |
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51 | partial_std_allocator_wrapper(const partial_std_allocator_wrapper<Other>&){} |
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52 | |
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53 | partial_std_allocator_wrapper(const std::allocator<Type>& x): |
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54 | std::allocator<Type>(x) |
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55 | { |
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56 | }; |
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57 | |
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58 | #if defined(BOOST_DINKUMWARE_STDLIB) |
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59 | /* Dinkumware guys didn't provide a means to call allocate() without |
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60 | * supplying a hint, in disagreement with the standard. |
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61 | */ |
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62 | |
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63 | Type* allocate(std::size_t n,const void* hint=0) |
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64 | { |
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65 | std::allocator<Type>& a=*this; |
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66 | return a.allocate(n,hint); |
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67 | } |
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68 | #endif |
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69 | |
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70 | }; |
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71 | |
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72 | /* Detects whether a given allocator belongs to a defective stdlib not |
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73 | * having the required member templates. |
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74 | * Note that it does not suffice to check the Boost.Config stdlib |
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75 | * macros, as the user might have passed a custom, compliant allocator. |
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76 | * The checks also considers partial_std_allocator_wrapper to be |
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77 | * a standard defective allocator. |
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78 | */ |
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79 | |
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80 | #if defined(BOOST_NO_STD_ALLOCATOR)&&\ |
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81 | (defined(BOOST_HAS_PARTIAL_STD_ALLOCATOR)||defined(BOOST_DINKUMWARE_STDLIB)) |
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82 | |
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83 | template<typename Allocator> |
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84 | struct is_partial_std_allocator |
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85 | { |
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86 | BOOST_STATIC_CONSTANT(bool, |
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87 | value= |
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88 | (is_same< |
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89 | std::allocator<BOOST_DEDUCED_TYPENAME Allocator::value_type>, |
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90 | Allocator |
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91 | >::value)|| |
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92 | (is_same< |
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93 | partial_std_allocator_wrapper< |
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94 | BOOST_DEDUCED_TYPENAME Allocator::value_type>, |
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95 | Allocator |
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96 | >::value)); |
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97 | }; |
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98 | |
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99 | #else |
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100 | |
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101 | template<typename Allocator> |
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102 | struct is_partial_std_allocator |
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103 | { |
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104 | BOOST_STATIC_CONSTANT(bool,value=false); |
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105 | }; |
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106 | |
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107 | #endif |
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108 | |
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109 | /* rebind operations for defective std allocators */ |
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110 | |
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111 | template<typename Allocator,typename Type> |
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112 | struct partial_std_allocator_rebind_to |
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113 | { |
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114 | typedef partial_std_allocator_wrapper<Type> type; |
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115 | }; |
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116 | |
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117 | /* rebind operation in all other cases */ |
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118 | |
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119 | #if BOOST_WORKAROUND(BOOST_MSVC,<1300) |
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120 | /* Workaround for a problem in MSVC with dependent template typedefs |
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121 | * when doing rebinding of allocators. |
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122 | * Modeled after <boost/mpl/aux_/msvc_dtw.hpp> (thanks, Aleksey!) |
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123 | */ |
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124 | |
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125 | template<typename Allocator> |
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126 | struct rebinder |
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127 | { |
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128 | template<bool> struct fake_allocator:Allocator{}; |
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129 | template<> struct fake_allocator<true> |
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130 | { |
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131 | template<typename Type> struct rebind{}; |
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132 | }; |
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133 | |
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134 | template<typename Type> |
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135 | struct result: |
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136 | fake_allocator<mpl::aux::msvc_never_true<Allocator>::value>:: |
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137 | template rebind<Type> |
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138 | { |
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139 | }; |
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140 | }; |
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141 | #else |
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142 | template<typename Allocator> |
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143 | struct rebinder |
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144 | { |
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145 | template<typename Type> |
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146 | struct result |
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147 | { |
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148 | typedef typename Allocator::BOOST_NESTED_TEMPLATE |
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149 | rebind<Type>::other other; |
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150 | }; |
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151 | }; |
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152 | #endif |
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153 | |
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154 | template<typename Allocator,typename Type> |
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155 | struct compliant_allocator_rebind_to |
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156 | { |
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157 | typedef typename rebinder<Allocator>:: |
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158 | BOOST_NESTED_TEMPLATE result<Type>::other type; |
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159 | }; |
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160 | |
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161 | /* rebind front-end */ |
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162 | |
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163 | template<typename Allocator,typename Type> |
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164 | struct rebind_to: |
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165 | mpl::eval_if_c< |
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166 | is_partial_std_allocator<Allocator>::value, |
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167 | partial_std_allocator_rebind_to<Allocator,Type>, |
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168 | compliant_allocator_rebind_to<Allocator,Type> |
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169 | > |
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170 | { |
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171 | }; |
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172 | |
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173 | /* allocator-independent versions of construct and destroy */ |
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174 | |
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175 | template<typename Type> |
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176 | void construct(void* p,const Type& t) |
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177 | { |
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178 | new (p) Type(t); |
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179 | } |
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180 | |
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181 | #if BOOST_WORKAROUND(BOOST_MSVC,BOOST_TESTED_AT(1500)) |
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182 | /* MSVC++ issues spurious warnings about unreferencend formal parameters |
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183 | * in destroy<Type> when Type is a class with trivial dtor. |
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184 | */ |
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185 | |
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186 | #pragma warning(push) |
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187 | #pragma warning(disable:4100) |
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188 | #endif |
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189 | |
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190 | template<typename Type> |
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191 | void destroy(const Type* p) |
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192 | { |
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193 | |
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194 | #if BOOST_WORKAROUND(__SUNPRO_CC,BOOST_TESTED_AT(0x590)) |
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195 | const_cast<Type*>(p)->~Type(); |
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196 | #else |
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197 | p->~Type(); |
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198 | #endif |
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199 | |
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200 | } |
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201 | |
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202 | #if BOOST_WORKAROUND(BOOST_MSVC,BOOST_TESTED_AT(1500)) |
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203 | #pragma warning(pop) |
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204 | #endif |
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205 | |
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206 | } /* namespace boost::detail::allocator */ |
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207 | |
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208 | } /* namespace boost::detail */ |
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209 | |
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210 | } /* namespace boost */ |
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211 | |
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212 | #endif |
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