1 | // (C) Copyright Thorsten Ottosen 2005. |
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2 | // (C) Copyright Jonathan Turkanis 2004. |
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3 | // (C) Copyright Daniel Wallin 2004. |
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4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) |
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6 | |
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7 | // Implementation of the move_ptr from the "Move Proposal" |
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8 | // (http://std.dkuug.dk/jtc1/sc22/wg21/docs/papers/2002/n1377.htm) |
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9 | // enhanced to support custom deleters and safe boolean conversions. |
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10 | // |
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11 | // The implementation is based on an implementation by Daniel Wallin, at |
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12 | // "http://aspn.activestate.com/ASPN/Mail/Message/Attachments/boost/ |
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13 | // 400DC271.1060903@student.umu.se/move_ptr.hpp". The current was adapted |
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14 | // by Jonathan Turkanis to incorporating ideas of Howard Hinnant and |
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15 | // Rani Sharoni. |
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16 | |
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17 | #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED |
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18 | #define BOOST_STATIC_MOVE_PTR_HPP_INCLUDED |
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19 | |
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20 | #include <boost/config.hpp> // Member template friends, put size_t in std. |
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21 | #include <algorithm> // swap. |
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22 | #include <cstddef> // size_t |
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23 | #include <boost/compressed_pair.hpp> |
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24 | #include <boost/ptr_container/detail/default_deleter.hpp> |
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25 | #include <boost/ptr_container/detail/is_convertible.hpp> |
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26 | #include <boost/ptr_container/detail/move.hpp> |
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27 | #include <boost/static_assert.hpp> |
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28 | #include <boost/type_traits/add_reference.hpp> |
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29 | #include <boost/type_traits/is_array.hpp> |
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30 | |
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31 | #if defined(BOOST_MSVC) |
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32 | #pragma warning(push) |
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33 | #pragma warning(disable:4521) // Multiple copy constuctors. |
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34 | #endif |
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35 | |
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36 | namespace boost { namespace ptr_container_detail { |
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37 | |
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38 | |
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39 | template< typename T, |
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40 | typename Deleter = |
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41 | move_ptrs::default_deleter<T> > |
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42 | class static_move_ptr |
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43 | { |
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44 | public: |
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45 | |
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46 | typedef typename remove_bounds<T>::type element_type; |
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47 | typedef Deleter deleter_type; |
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48 | |
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49 | private: |
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50 | |
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51 | struct safe_bool_helper { int x; }; |
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52 | typedef int safe_bool_helper::* safe_bool; |
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53 | typedef boost::compressed_pair<element_type*, Deleter> impl_type; |
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54 | |
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55 | public: |
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56 | typedef typename impl_type::second_reference deleter_reference; |
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57 | typedef typename impl_type::second_const_reference deleter_const_reference; |
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58 | |
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59 | // Constructors |
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60 | |
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61 | static_move_ptr() : impl_(0) { } |
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62 | |
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63 | static_move_ptr(const static_move_ptr& p) |
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64 | : impl_(p.get(), p.get_deleter()) |
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65 | { |
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66 | const_cast<static_move_ptr&>(p).release(); |
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67 | } |
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68 | |
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69 | #if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564)) |
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70 | static_move_ptr( const move_ptrs::move_source<static_move_ptr<T,Deleter> >& src ) |
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71 | #else |
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72 | static_move_ptr( const move_ptrs::move_source<static_move_ptr>& src ) |
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73 | #endif |
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74 | : impl_(src.ptr().get(), src.ptr().get_deleter()) |
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75 | { |
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76 | src.ptr().release(); |
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77 | } |
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78 | |
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79 | template<typename TT> |
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80 | explicit static_move_ptr(TT* tt) |
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81 | : impl_(tt, Deleter()) |
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82 | { } |
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83 | |
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84 | // Destructor |
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85 | |
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86 | ~static_move_ptr() { if (ptr()) get_deleter()(ptr()); } |
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87 | |
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88 | // Assignment |
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89 | |
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90 | static_move_ptr& operator=(static_move_ptr rhs) |
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91 | { |
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92 | rhs.swap(*this); |
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93 | return *this; |
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94 | } |
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95 | |
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96 | // Smart pointer interface |
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97 | |
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98 | element_type* get() const { return ptr(); } |
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99 | |
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100 | element_type& operator*() |
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101 | { |
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102 | /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); |
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103 | } |
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104 | |
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105 | const element_type& operator*() const |
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106 | { |
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107 | /*BOOST_STATIC_ASSERT(!is_array);*/ return *ptr(); |
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108 | } |
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109 | |
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110 | element_type* operator->() |
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111 | { |
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112 | /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); |
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113 | } |
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114 | |
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115 | const element_type* operator->() const |
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116 | { |
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117 | /*BOOST_STATIC_ASSERT(!is_array);*/ return ptr(); |
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118 | } |
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119 | |
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120 | |
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121 | element_type* release() |
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122 | { |
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123 | element_type* result = ptr(); |
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124 | ptr() = 0; |
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125 | return result; |
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126 | } |
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127 | |
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128 | void reset() |
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129 | { |
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130 | if (ptr()) get_deleter()(ptr()); |
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131 | ptr() = 0; |
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132 | } |
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133 | |
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134 | template<typename TT> |
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135 | void reset(TT* tt) |
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136 | { |
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137 | static_move_ptr(tt).swap(*this); |
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138 | } |
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139 | |
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140 | template<typename TT, typename DD> |
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141 | void reset(TT* tt, DD dd) |
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142 | { |
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143 | static_move_ptr(tt, dd).swap(*this); |
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144 | } |
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145 | |
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146 | operator safe_bool() const { return ptr() ? &safe_bool_helper::x : 0; } |
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147 | |
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148 | void swap(static_move_ptr& p) { impl_.swap(p.impl_); } |
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149 | |
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150 | deleter_reference get_deleter() { return impl_.second(); } |
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151 | |
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152 | deleter_const_reference get_deleter() const { return impl_.second(); } |
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153 | private: |
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154 | template<typename TT, typename DD> |
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155 | void check(const static_move_ptr<TT, DD>& ptr) |
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156 | { |
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157 | typedef move_ptrs::is_smart_ptr_convertible<TT, T> convertible; |
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158 | BOOST_STATIC_ASSERT(convertible::value); |
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159 | } |
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160 | |
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161 | #if defined(BOOST_NO_FUNCTION_TEMPLATE_ORDERING) || defined(BOOST_NO_SFINAE) |
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162 | // give up on this behavior |
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163 | #else |
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164 | |
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165 | template<typename Ptr> struct cant_move_from_const; |
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166 | |
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167 | template<typename TT, typename DD> |
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168 | struct cant_move_from_const< const static_move_ptr<TT, DD> > { |
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169 | typedef typename static_move_ptr<TT, DD>::error type; |
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170 | }; |
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171 | |
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172 | template<typename Ptr> |
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173 | static_move_ptr(Ptr&, typename cant_move_from_const<Ptr>::type = 0); |
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174 | |
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175 | |
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176 | public: |
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177 | static_move_ptr(static_move_ptr&); |
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178 | |
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179 | |
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180 | private: |
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181 | template<typename TT, typename DD> |
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182 | static_move_ptr( static_move_ptr<TT, DD>&, |
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183 | typename |
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184 | move_ptrs::enable_if_convertible< |
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185 | TT, T, static_move_ptr& |
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186 | >::type::type* = 0 ); |
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187 | |
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188 | #endif // BOOST_NO_FUNCTION_TEMPLATE_ORDERING || BOOST_NO_SFINAE |
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189 | |
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190 | //#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
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191 | // template<typename TT, typename DD> |
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192 | // friend class static_move_ptr; |
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193 | //#else |
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194 | public: |
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195 | //#endif |
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196 | typename impl_type::first_reference |
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197 | ptr() { return impl_.first(); } |
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198 | |
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199 | typename impl_type::first_const_reference |
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200 | ptr() const { return impl_.first(); } |
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201 | |
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202 | impl_type impl_; |
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203 | }; |
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204 | |
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205 | } // namespace ptr_container_detail |
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206 | } // End namespace boost. |
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207 | |
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208 | #if defined(BOOST_MSVC) |
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209 | #pragma warning(pop) // #pragma warning(disable:4251) |
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210 | #endif |
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211 | |
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212 | #endif // #ifndef BOOST_STATIC_MOVE_PTR_HPP_INCLUDED |
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