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1 // Boost.Signals library |
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2 |
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3 // Copyright Douglas Gregor 2001-2004. Use, modification and |
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4 // distribution is subject to the Boost Software License, Version |
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5 // 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 // For more information, see http://www.boost.org |
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9 |
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10 #ifndef BOOST_SIGNALS_TRACKABLE_HPP |
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11 #define BOOST_SIGNALS_TRACKABLE_HPP |
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12 |
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13 #include <boost/type_traits.hpp> |
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14 #include <boost/signals/connection.hpp> |
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15 #include <boost/pending/ct_if.hpp> |
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16 #include <boost/ref.hpp> |
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17 #include <boost/utility/addressof.hpp> |
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18 #include <list> |
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19 #include <vector> |
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20 |
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21 #ifdef BOOST_HAS_ABI_HEADERS |
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22 # include BOOST_ABI_PREFIX |
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23 #endif |
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24 |
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25 namespace boost { |
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26 |
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27 namespace BOOST_SIGNALS_NAMESPACE { |
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28 // Base class for "trackable" objects that can be tracked when they are |
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29 // bound in slot target functions. When a trackable object is destroyed, |
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30 // the signal/slot connections are disconnected automatically. |
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31 class BOOST_SIGNALS_DECL trackable { |
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32 private: |
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33 static void signal_disconnected(void* obj, void* data); |
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34 |
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35 friend class detail::signal_base_impl; |
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36 friend class detail::slot_base; |
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37 void signal_connected(connection, BOOST_SIGNALS_NAMESPACE::detail::bound_object&) const; |
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38 |
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39 protected: |
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40 trackable() : connected_signals(), dying(false) {} |
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41 trackable(const trackable&) : connected_signals(), dying(false) {} |
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42 ~trackable(); |
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43 |
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44 trackable& operator=(const trackable&) |
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45 { |
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46 connected_signals.clear(); |
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47 return *this; |
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48 } |
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49 |
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50 private: |
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51 typedef std::list<connection> connection_list; |
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52 typedef connection_list::iterator connection_iterator; |
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53 |
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54 // List of connections that this object is part of |
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55 mutable connection_list connected_signals; |
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56 |
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57 // True when the object is being destroyed |
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58 mutable bool dying; |
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59 }; |
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60 |
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61 namespace detail { |
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62 template<bool Cond> struct truth {}; |
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63 |
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64 // A visitor that adds each trackable object to a vector |
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65 class bound_objects_visitor { |
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66 public: |
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67 bound_objects_visitor(std::vector<const trackable*>& v) : |
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68 bound_objects(v) |
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69 { |
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70 } |
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71 |
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72 template<typename T> |
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73 void operator()(const T& t) const |
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74 { |
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75 decode(t, 0); |
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76 } |
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77 |
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78 private: |
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79 // decode() decides between a reference wrapper and anything else |
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80 template<typename T> |
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81 void decode(const reference_wrapper<T>& t, int) const |
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82 { |
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83 add_if_trackable(t.get_pointer()); |
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84 } |
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85 |
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86 template<typename T> |
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87 void decode(const T& t, long) const |
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88 { |
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89 typedef truth<(is_pointer<T>::value)> is_a_pointer; |
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90 maybe_get_pointer(t, is_a_pointer()); |
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91 } |
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92 |
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93 // maybe_get_pointer() decides between a pointer and a non-pointer |
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94 template<typename T> |
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95 void maybe_get_pointer(const T& t, truth<true>) const |
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96 { |
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97 add_if_trackable(t); |
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98 } |
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99 |
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100 template<typename T> |
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101 void maybe_get_pointer(const T& t, truth<false>) const |
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102 { |
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103 // Take the address of this object, because the object itself may be |
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104 // trackable |
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105 add_if_trackable(boost::addressof(t)); |
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106 } |
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107 |
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108 // add_if_trackable() adds trackable objects to the list of bound objects |
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109 inline void add_if_trackable(const trackable* b) const |
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110 { |
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111 if (b) { |
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112 bound_objects.push_back(b); |
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113 } |
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114 } |
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115 |
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116 inline void add_if_trackable(const void*) const |
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117 { |
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118 } |
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119 |
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120 template<typename R> |
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121 inline void add_if_trackable(R (*)()) const |
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122 { |
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123 } |
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124 |
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125 template<typename R, typename T1> |
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126 inline void add_if_trackable(R (*)(T1)) const |
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127 { |
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128 } |
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129 |
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130 template<typename R, typename T1, typename T2> |
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131 inline void add_if_trackable(R (*)(T1, T2)) const |
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132 { |
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133 } |
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134 |
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135 template<typename R, typename T1, typename T2, typename T3> |
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136 inline void add_if_trackable(R (*)(T1, T2, T3)) const |
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137 { |
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138 } |
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139 |
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140 template<typename R, typename T1, typename T2, typename T3, typename T4> |
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141 inline void add_if_trackable(R (*)(T1, T2, T3, T4)) const |
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142 { |
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143 } |
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144 |
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145 template<typename R, typename T1, typename T2, typename T3, typename T4, |
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146 typename T5> |
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147 inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5)) const |
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148 { |
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149 } |
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150 |
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151 template<typename R, typename T1, typename T2, typename T3, typename T4, |
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152 typename T5, typename T6> |
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153 inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6)) const |
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154 { |
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155 } |
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156 |
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157 template<typename R, typename T1, typename T2, typename T3, typename T4, |
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158 typename T5, typename T6, typename T7> |
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159 inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7)) const |
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160 { |
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161 } |
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162 |
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163 template<typename R, typename T1, typename T2, typename T3, typename T4, |
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164 typename T5, typename T6, typename T7, typename T8> |
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165 inline void add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7, T8)) const |
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166 { |
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167 } |
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168 |
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169 template<typename R, typename T1, typename T2, typename T3, typename T4, |
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170 typename T5, typename T6, typename T7, typename T8, typename T9> |
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171 inline void |
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172 add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9)) const |
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173 { |
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174 } |
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175 |
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176 template<typename R, typename T1, typename T2, typename T3, typename T4, |
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177 typename T5, typename T6, typename T7, typename T8, typename T9, |
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178 typename T10> |
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179 inline void |
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180 add_if_trackable(R (*)(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)) const |
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181 { |
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182 } |
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183 |
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184 std::vector<const trackable*>& bound_objects; |
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185 }; |
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186 } // end namespace detail |
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187 } // end namespace BOOST_SIGNALS_NAMESPACE |
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188 |
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189 } // end namespace boost |
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190 |
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191 #ifdef BOOST_HAS_ABI_HEADERS |
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192 # include BOOST_ABI_SUFFIX |
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193 #endif |
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194 |
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195 #endif // BOOST_SIGNALS_TRACKABLE_HPP |