1 | /*============================================================================= |
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2 | Copyright (c) 2007 Tobias Schwinger |
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3 | |
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4 | Use modification and distribution are subject to the Boost Software |
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5 | License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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6 | http://www.boost.org/LICENSE_1_0.txt). |
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7 | ==============================================================================*/ |
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8 | |
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9 | #ifndef BOOST_FUNCTIONAL_FACTORY_HPP_INCLUDED |
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10 | # ifndef BOOST_PP_IS_ITERATING |
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11 | |
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12 | # include <boost/preprocessor/iteration/iterate.hpp> |
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13 | # include <boost/preprocessor/repetition/enum_params.hpp> |
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14 | # include <boost/preprocessor/repetition/enum_binary_params.hpp> |
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15 | |
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16 | # include <new> |
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17 | # include <boost/pointee.hpp> |
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18 | # include <boost/none_t.hpp> |
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19 | # include <boost/get_pointer.hpp> |
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20 | # include <boost/non_type.hpp> |
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21 | # include <boost/type_traits/remove_cv.hpp> |
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22 | |
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23 | # ifndef BOOST_FUNCTIONAL_FACTORY_MAX_ARITY |
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24 | # define BOOST_FUNCTIONAL_FACTORY_MAX_ARITY 10 |
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25 | # elif BOOST_FUNCTIONAL_FACTORY_MAX_ARITY < 3 |
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26 | # undef BOOST_FUNCTIONAL_FACTORY_MAX_ARITY |
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27 | # define BOOST_FUNCTIONAL_FACTORY_MAX_ARITY 3 |
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28 | # endif |
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29 | |
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30 | namespace boost |
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31 | { |
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32 | enum factory_alloc_propagation |
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33 | { |
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34 | factory_alloc_for_pointee_and_deleter, |
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35 | factory_passes_alloc_to_smart_pointer |
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36 | }; |
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37 | |
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38 | template< typename Pointer, class Allocator = boost::none_t, |
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39 | factory_alloc_propagation AP = factory_alloc_for_pointee_and_deleter > |
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40 | class factory; |
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41 | |
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42 | //----- ---- --- -- - - - - |
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43 | |
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44 | template< typename Pointer, factory_alloc_propagation AP > |
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45 | class factory<Pointer, boost::none_t, AP> |
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46 | { |
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47 | public: |
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48 | typedef typename boost::remove_cv<Pointer>::type result_type; |
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49 | typedef typename boost::pointee<result_type>::type value_type; |
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50 | |
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51 | factory() |
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52 | { } |
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53 | |
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54 | # define BOOST_PP_FILENAME_1 <boost/functional/factory.hpp> |
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55 | # define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_FACTORY_MAX_ARITY) |
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56 | # include BOOST_PP_ITERATE() |
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57 | }; |
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58 | |
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59 | template< class Pointer, class Allocator, factory_alloc_propagation AP > |
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60 | class factory |
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61 | : private Allocator::template rebind< typename boost::pointee< |
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62 | typename boost::remove_cv<Pointer>::type >::type >::other |
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63 | { |
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64 | public: |
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65 | typedef typename boost::remove_cv<Pointer>::type result_type; |
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66 | typedef typename boost::pointee<result_type>::type value_type; |
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67 | |
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68 | typedef typename Allocator::template rebind<value_type>::other |
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69 | allocator_type; |
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70 | |
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71 | explicit factory(allocator_type const & a = allocator_type()) |
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72 | : allocator_type(a) |
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73 | { } |
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74 | |
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75 | private: |
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76 | |
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77 | struct deleter |
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78 | : allocator_type |
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79 | { |
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80 | inline deleter(allocator_type const& that) |
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81 | : allocator_type(that) |
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82 | { } |
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83 | |
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84 | allocator_type& get_allocator() const |
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85 | { |
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86 | return *const_cast<allocator_type*>( |
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87 | static_cast<allocator_type const*>(this)); |
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88 | } |
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89 | |
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90 | void operator()(value_type* ptr) const |
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91 | { |
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92 | if (!! ptr) ptr->~value_type(); |
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93 | const_cast<allocator_type*>(static_cast<allocator_type const*>( |
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94 | this))->deallocate(ptr,1); |
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95 | } |
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96 | }; |
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97 | |
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98 | inline allocator_type& get_allocator() const |
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99 | { |
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100 | return *const_cast<allocator_type*>( |
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101 | static_cast<allocator_type const*>(this)); |
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102 | } |
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103 | |
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104 | inline result_type make_pointer(value_type* ptr, boost::non_type< |
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105 | factory_alloc_propagation,factory_passes_alloc_to_smart_pointer>) |
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106 | const |
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107 | { |
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108 | return result_type(ptr,deleter(this->get_allocator())); |
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109 | } |
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110 | inline result_type make_pointer(value_type* ptr, boost::non_type< |
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111 | factory_alloc_propagation,factory_alloc_for_pointee_and_deleter>) |
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112 | const |
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113 | { |
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114 | return result_type(ptr,deleter(this->get_allocator()), |
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115 | this->get_allocator()); |
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116 | } |
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117 | |
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118 | public: |
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119 | |
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120 | # define BOOST_TMP_MACRO |
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121 | # define BOOST_PP_FILENAME_1 <boost/functional/factory.hpp> |
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122 | # define BOOST_PP_ITERATION_LIMITS (0,BOOST_FUNCTIONAL_FACTORY_MAX_ARITY) |
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123 | # include BOOST_PP_ITERATE() |
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124 | # undef BOOST_TMP_MACRO |
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125 | }; |
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126 | |
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127 | template< typename Pointer, class Allocator, factory_alloc_propagation AP > |
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128 | class factory<Pointer&, Allocator, AP>; |
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129 | // forbidden, would create a dangling reference |
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130 | } |
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131 | |
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132 | # define BOOST_FUNCTIONAL_FACTORY_HPP_INCLUDED |
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133 | # else // defined(BOOST_PP_IS_ITERATING) |
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134 | # define N BOOST_PP_ITERATION() |
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135 | # if !defined(BOOST_TMP_MACRO) |
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136 | # if N > 0 |
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137 | template< BOOST_PP_ENUM_PARAMS(N, typename T) > |
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138 | # endif |
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139 | inline result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& a)) const |
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140 | { |
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141 | return result_type( new value_type(BOOST_PP_ENUM_PARAMS(N,a)) ); |
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142 | } |
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143 | # else // defined(BOOST_TMP_MACRO) |
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144 | # if N > 0 |
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145 | template< BOOST_PP_ENUM_PARAMS(N, typename T) > |
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146 | # endif |
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147 | inline result_type operator()(BOOST_PP_ENUM_BINARY_PARAMS(N,T,& a)) const |
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148 | { |
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149 | value_type* memory = this->get_allocator().allocate(1); |
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150 | try |
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151 | { |
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152 | return make_pointer( |
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153 | new(memory) value_type(BOOST_PP_ENUM_PARAMS(N,a)), |
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154 | boost::non_type<factory_alloc_propagation,AP>() ); |
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155 | } |
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156 | catch (...) { this->get_allocator().deallocate(memory,1); throw; } |
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157 | } |
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158 | # endif |
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159 | # undef N |
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160 | # endif // defined(BOOST_PP_IS_ITERATING) |
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161 | |
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162 | #endif // include guard |
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163 | |
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