1 | // Boost.Function library |
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2 | |
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3 | // Copyright Douglas Gregor 2001-2006. 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_FUNCTION_BASE_HEADER |
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11 | #define BOOST_FUNCTION_BASE_HEADER |
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12 | |
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13 | #include <stdexcept> |
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14 | #include <string> |
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15 | #include <memory> |
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16 | #include <new> |
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17 | #include <typeinfo> |
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18 | #include <boost/config.hpp> |
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19 | #include <boost/assert.hpp> |
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20 | #include <boost/type_traits/is_integral.hpp> |
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21 | #include <boost/type_traits/composite_traits.hpp> |
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22 | #include <boost/ref.hpp> |
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23 | #include <boost/mpl/if.hpp> |
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24 | #include <boost/detail/workaround.hpp> |
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25 | #include <boost/type_traits/alignment_of.hpp> |
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26 | #ifndef BOOST_NO_SFINAE |
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27 | # include "boost/utility/enable_if.hpp" |
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28 | #else |
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29 | # include "boost/mpl/bool.hpp" |
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30 | #endif |
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31 | #include <boost/function_equal.hpp> |
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32 | |
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33 | // Borrowed from Boost.Python library: determines the cases where we |
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34 | // need to use std::type_info::name to compare instead of operator==. |
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35 | # if (defined(__GNUC__) && __GNUC__ >= 3) \ |
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36 | || defined(_AIX) \ |
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37 | || ( defined(__sgi) && defined(__host_mips)) |
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38 | # include <cstring> |
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39 | # define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) \ |
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40 | (std::strcmp((X).name(),(Y).name()) == 0) |
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41 | # else |
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42 | # define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) ((X)==(Y)) |
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43 | #endif |
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44 | |
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45 | #if defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__ICL) && __ICL <= 600 || defined(__MWERKS__) && __MWERKS__ < 0x2406 && !defined(BOOST_STRICT_CONFIG) |
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46 | # define BOOST_FUNCTION_TARGET_FIX(x) x |
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47 | #else |
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48 | # define BOOST_FUNCTION_TARGET_FIX(x) |
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49 | #endif // not MSVC |
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50 | |
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51 | #if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730 && !defined(BOOST_STRICT_CONFIG) |
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52 | // Work around a compiler bug. |
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53 | // boost::python::objects::function has to be seen by the compiler before the |
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54 | // boost::function class template. |
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55 | namespace boost { namespace python { namespace objects { |
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56 | class function; |
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57 | }}} |
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58 | #endif |
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59 | |
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60 | #if defined (BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) \ |
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61 | || defined(BOOST_BCB_PARTIAL_SPECIALIZATION_BUG) \ |
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62 | || !(BOOST_STRICT_CONFIG || !defined(__SUNPRO_CC) || __SUNPRO_CC > 0x540) |
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63 | # define BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX |
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64 | #endif |
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65 | |
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66 | #if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) |
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67 | # define BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor,Type) \ |
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68 | typename ::boost::enable_if_c<(::boost::type_traits::ice_not< \ |
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69 | (::boost::is_integral<Functor>::value)>::value), \ |
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70 | Type>::type |
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71 | #else |
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72 | // BCC doesn't recognize this depends on a template argument and complains |
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73 | // about the use of 'typename' |
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74 | # define BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor,Type) \ |
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75 | ::boost::enable_if_c<(::boost::type_traits::ice_not< \ |
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76 | (::boost::is_integral<Functor>::value)>::value), \ |
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77 | Type>::type |
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78 | #endif |
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79 | |
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80 | #if !defined(BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX) |
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81 | namespace boost { |
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82 | |
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83 | #if defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730 && !defined(BOOST_STRICT_CONFIG) |
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84 | // The library shipping with MIPSpro 7.3.1.3m has a broken allocator<void> |
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85 | class function_base; |
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86 | |
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87 | template<typename Signature, |
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88 | typename Allocator = std::allocator<function_base> > |
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89 | class function; |
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90 | #else |
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91 | template<typename Signature, typename Allocator = std::allocator<void> > |
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92 | class function; |
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93 | #endif |
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94 | |
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95 | template<typename Signature, typename Allocator> |
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96 | inline void swap(function<Signature, Allocator>& f1, |
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97 | function<Signature, Allocator>& f2) |
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98 | { |
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99 | f1.swap(f2); |
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100 | } |
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101 | |
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102 | } // end namespace boost |
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103 | #endif // have partial specialization |
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104 | |
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105 | namespace boost { |
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106 | namespace detail { |
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107 | namespace function { |
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108 | class X; |
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109 | |
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110 | /** |
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111 | * A buffer used to store small function objects in |
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112 | * boost::function. It is a union containing function pointers, |
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113 | * object pointers, and a structure that resembles a bound |
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114 | * member function pointer. |
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115 | */ |
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116 | union function_buffer |
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117 | { |
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118 | // For pointers to function objects |
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119 | void* obj_ptr; |
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120 | |
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121 | // For pointers to std::type_info objects |
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122 | // (get_functor_type_tag, check_functor_type_tag). |
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123 | const void* const_obj_ptr; |
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124 | |
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125 | // For function pointers of all kinds |
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126 | mutable void (*func_ptr)(); |
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127 | |
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128 | // For bound member pointers |
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129 | struct bound_memfunc_ptr_t { |
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130 | void (X::*memfunc_ptr)(int); |
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131 | void* obj_ptr; |
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132 | } bound_memfunc_ptr; |
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133 | |
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134 | // To relax aliasing constraints |
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135 | mutable char data; |
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136 | }; |
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137 | |
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138 | /** |
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139 | * The unusable class is a placeholder for unused function arguments |
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140 | * It is also completely unusable except that it constructable from |
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141 | * anything. This helps compilers without partial specialization to |
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142 | * handle Boost.Function objects returning void. |
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143 | */ |
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144 | struct unusable |
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145 | { |
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146 | unusable() {} |
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147 | template<typename T> unusable(const T&) {} |
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148 | }; |
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149 | |
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150 | /* Determine the return type. This supports compilers that do not support |
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151 | * void returns or partial specialization by silently changing the return |
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152 | * type to "unusable". |
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153 | */ |
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154 | template<typename T> struct function_return_type { typedef T type; }; |
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155 | |
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156 | template<> |
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157 | struct function_return_type<void> |
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158 | { |
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159 | typedef unusable type; |
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160 | }; |
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161 | |
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162 | // The operation type to perform on the given functor/function pointer |
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163 | enum functor_manager_operation_type { |
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164 | clone_functor_tag, |
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165 | destroy_functor_tag, |
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166 | check_functor_type_tag, |
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167 | get_functor_type_tag |
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168 | }; |
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169 | |
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170 | // Tags used to decide between different types of functions |
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171 | struct function_ptr_tag {}; |
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172 | struct function_obj_tag {}; |
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173 | struct member_ptr_tag {}; |
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174 | struct function_obj_ref_tag {}; |
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175 | |
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176 | template<typename F> |
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177 | class get_function_tag |
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178 | { |
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179 | typedef typename mpl::if_c<(is_pointer<F>::value), |
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180 | function_ptr_tag, |
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181 | function_obj_tag>::type ptr_or_obj_tag; |
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182 | |
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183 | typedef typename mpl::if_c<(is_member_pointer<F>::value), |
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184 | member_ptr_tag, |
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185 | ptr_or_obj_tag>::type ptr_or_obj_or_mem_tag; |
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186 | |
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187 | typedef typename mpl::if_c<(is_reference_wrapper<F>::value), |
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188 | function_obj_ref_tag, |
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189 | ptr_or_obj_or_mem_tag>::type or_ref_tag; |
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190 | |
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191 | public: |
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192 | typedef or_ref_tag type; |
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193 | }; |
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194 | |
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195 | // The trivial manager does nothing but return the same pointer (if we |
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196 | // are cloning) or return the null pointer (if we are deleting). |
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197 | template<typename F> |
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198 | struct reference_manager |
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199 | { |
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200 | static inline void |
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201 | get(const function_buffer& in_buffer, function_buffer& out_buffer, |
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202 | functor_manager_operation_type op) |
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203 | { |
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204 | switch (op) { |
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205 | case clone_functor_tag: |
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206 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
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207 | return; |
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208 | |
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209 | case destroy_functor_tag: |
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210 | out_buffer.obj_ptr = 0; |
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211 | return; |
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212 | |
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213 | case check_functor_type_tag: |
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214 | { |
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215 | // DPG TBD: Since we're only storing a pointer, it's |
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216 | // possible that the user could ask for a base class or |
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217 | // derived class. Is that okay? |
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218 | const std::type_info& check_type = |
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219 | *static_cast<const std::type_info*>(out_buffer.const_obj_ptr); |
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220 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(F))) |
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221 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
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222 | else |
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223 | out_buffer.obj_ptr = 0; |
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224 | } |
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225 | return; |
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226 | |
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227 | case get_functor_type_tag: |
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228 | out_buffer.const_obj_ptr = &typeid(F); |
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229 | return; |
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230 | } |
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231 | } |
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232 | }; |
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233 | |
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234 | /** |
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235 | * Determine if boost::function can use the small-object |
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236 | * optimization with the function object type F. |
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237 | */ |
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238 | template<typename F> |
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239 | struct function_allows_small_object_optimization |
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240 | { |
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241 | BOOST_STATIC_CONSTANT |
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242 | (bool, |
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243 | value = ((sizeof(F) <= sizeof(function_buffer) && |
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244 | (alignment_of<function_buffer>::value |
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245 | % alignment_of<F>::value == 0)))); |
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246 | }; |
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247 | |
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248 | /** |
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249 | * The functor_manager class contains a static function "manage" which |
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250 | * can clone or destroy the given function/function object pointer. |
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251 | */ |
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252 | template<typename Functor, typename Allocator> |
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253 | struct functor_manager |
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254 | { |
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255 | private: |
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256 | typedef Functor functor_type; |
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257 | |
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258 | // For function pointers, the manager is trivial |
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259 | static inline void |
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260 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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261 | functor_manager_operation_type op, function_ptr_tag) |
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262 | { |
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263 | if (op == clone_functor_tag) |
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264 | out_buffer.func_ptr = in_buffer.func_ptr; |
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265 | else if (op == destroy_functor_tag) |
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266 | out_buffer.func_ptr = 0; |
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267 | else /* op == check_functor_type_tag */ { |
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268 | const std::type_info& check_type = |
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269 | *static_cast<const std::type_info*>(out_buffer.const_obj_ptr); |
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270 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor))) |
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271 | out_buffer.obj_ptr = &in_buffer.func_ptr; |
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272 | else |
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273 | out_buffer.obj_ptr = 0; |
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274 | } |
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275 | } |
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276 | |
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277 | // Function objects that fit in the small-object buffer. |
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278 | static inline void |
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279 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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280 | functor_manager_operation_type op, mpl::true_) |
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281 | { |
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282 | if (op == clone_functor_tag) { |
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283 | const functor_type* in_functor = |
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284 | reinterpret_cast<const functor_type*>(&in_buffer.data); |
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285 | new ((void*)&out_buffer.data) functor_type(*in_functor); |
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286 | } else if (op == destroy_functor_tag) { |
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287 | // Some compilers (Borland, vc6, ...) are unhappy with ~functor_type. |
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288 | reinterpret_cast<functor_type*>(&out_buffer.data)->~Functor(); |
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289 | } else /* op == check_functor_type_tag */ { |
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290 | const std::type_info& check_type = |
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291 | *static_cast<const std::type_info*>(out_buffer.const_obj_ptr); |
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292 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor))) |
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293 | out_buffer.obj_ptr = &in_buffer.data; |
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294 | else |
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295 | out_buffer.obj_ptr = 0; |
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296 | } |
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297 | } |
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298 | |
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299 | // Function objects that require heap allocation |
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300 | static inline void |
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301 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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302 | functor_manager_operation_type op, mpl::false_) |
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303 | { |
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304 | #ifndef BOOST_NO_STD_ALLOCATOR |
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305 | typedef typename Allocator::template rebind<functor_type>::other |
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306 | allocator_type; |
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307 | typedef typename allocator_type::pointer pointer_type; |
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308 | #else |
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309 | typedef functor_type* pointer_type; |
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310 | #endif // BOOST_NO_STD_ALLOCATOR |
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311 | |
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312 | # ifndef BOOST_NO_STD_ALLOCATOR |
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313 | allocator_type allocator; |
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314 | # endif // BOOST_NO_STD_ALLOCATOR |
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315 | |
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316 | if (op == clone_functor_tag) { |
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317 | // GCC 2.95.3 gets the CV qualifiers wrong here, so we |
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318 | // can't do the static_cast that we should do. |
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319 | const functor_type* f = |
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320 | (const functor_type*)(in_buffer.obj_ptr); |
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321 | |
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322 | // Clone the functor |
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323 | # ifndef BOOST_NO_STD_ALLOCATOR |
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324 | pointer_type copy = allocator.allocate(1); |
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325 | allocator.construct(copy, *f); |
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326 | |
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327 | // Get back to the original pointer type |
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328 | functor_type* new_f = static_cast<functor_type*>(copy); |
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329 | # else |
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330 | functor_type* new_f = new functor_type(*f); |
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331 | # endif // BOOST_NO_STD_ALLOCATOR |
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332 | out_buffer.obj_ptr = new_f; |
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333 | } else if (op == destroy_functor_tag) { |
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334 | /* Cast from the void pointer to the functor pointer type */ |
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335 | functor_type* f = |
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336 | static_cast<functor_type*>(out_buffer.obj_ptr); |
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337 | |
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338 | # ifndef BOOST_NO_STD_ALLOCATOR |
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339 | /* Cast from the functor pointer type to the allocator's pointer |
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340 | type */ |
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341 | pointer_type victim = static_cast<pointer_type>(f); |
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342 | |
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343 | // Destroy and deallocate the functor |
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344 | allocator.destroy(victim); |
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345 | allocator.deallocate(victim, 1); |
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346 | # else |
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347 | delete f; |
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348 | # endif // BOOST_NO_STD_ALLOCATOR |
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349 | out_buffer.obj_ptr = 0; |
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350 | } else /* op == check_functor_type_tag */ { |
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351 | const std::type_info& check_type = |
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352 | *static_cast<const std::type_info*>(out_buffer.const_obj_ptr); |
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353 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, typeid(Functor))) |
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354 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
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355 | else |
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356 | out_buffer.obj_ptr = 0; |
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357 | } |
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358 | } |
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359 | |
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360 | // For function objects, we determine whether the function |
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361 | // object can use the small-object optimization buffer or |
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362 | // whether we need to allocate it on the heap. |
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363 | static inline void |
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364 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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365 | functor_manager_operation_type op, function_obj_tag) |
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366 | { |
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367 | manager(in_buffer, out_buffer, op, |
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368 | mpl::bool_<(function_allows_small_object_optimization<functor_type>::value)>()); |
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369 | } |
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370 | |
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371 | public: |
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372 | /* Dispatch to an appropriate manager based on whether we have a |
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373 | function pointer or a function object pointer. */ |
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374 | static inline void |
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375 | manage(const function_buffer& in_buffer, function_buffer& out_buffer, |
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376 | functor_manager_operation_type op) |
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377 | { |
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378 | typedef typename get_function_tag<functor_type>::type tag_type; |
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379 | switch (op) { |
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380 | case get_functor_type_tag: |
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381 | out_buffer.const_obj_ptr = &typeid(functor_type); |
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382 | return; |
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383 | |
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384 | default: |
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385 | manager(in_buffer, out_buffer, op, tag_type()); |
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386 | return; |
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387 | } |
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388 | } |
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389 | }; |
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390 | |
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391 | // A type that is only used for comparisons against zero |
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392 | struct useless_clear_type {}; |
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393 | |
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394 | #ifdef BOOST_NO_SFINAE |
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395 | // These routines perform comparisons between a Boost.Function |
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396 | // object and an arbitrary function object (when the last |
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397 | // parameter is mpl::bool_<false>) or against zero (when the |
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398 | // last parameter is mpl::bool_<true>). They are only necessary |
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399 | // for compilers that don't support SFINAE. |
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400 | template<typename Function, typename Functor> |
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401 | bool |
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402 | compare_equal(const Function& f, const Functor&, int, mpl::bool_<true>) |
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403 | { return f.empty(); } |
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404 | |
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405 | template<typename Function, typename Functor> |
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406 | bool |
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407 | compare_not_equal(const Function& f, const Functor&, int, |
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408 | mpl::bool_<true>) |
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409 | { return !f.empty(); } |
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410 | |
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411 | template<typename Function, typename Functor> |
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412 | bool |
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413 | compare_equal(const Function& f, const Functor& g, long, |
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414 | mpl::bool_<false>) |
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415 | { |
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416 | if (const Functor* fp = f.template target<Functor>()) |
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417 | return function_equal(*fp, g); |
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418 | else return false; |
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419 | } |
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420 | |
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421 | template<typename Function, typename Functor> |
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422 | bool |
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423 | compare_equal(const Function& f, const reference_wrapper<Functor>& g, |
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424 | int, mpl::bool_<false>) |
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425 | { |
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426 | if (const Functor* fp = f.template target<Functor>()) |
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427 | return fp == g.get_pointer(); |
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428 | else return false; |
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429 | } |
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430 | |
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431 | template<typename Function, typename Functor> |
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432 | bool |
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433 | compare_not_equal(const Function& f, const Functor& g, long, |
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434 | mpl::bool_<false>) |
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435 | { |
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436 | if (const Functor* fp = f.template target<Functor>()) |
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437 | return !function_equal(*fp, g); |
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438 | else return true; |
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439 | } |
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440 | |
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441 | template<typename Function, typename Functor> |
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442 | bool |
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443 | compare_not_equal(const Function& f, |
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444 | const reference_wrapper<Functor>& g, int, |
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445 | mpl::bool_<false>) |
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446 | { |
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447 | if (const Functor* fp = f.template target<Functor>()) |
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448 | return fp != g.get_pointer(); |
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449 | else return true; |
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450 | } |
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451 | #endif // BOOST_NO_SFINAE |
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452 | |
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453 | /** |
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454 | * Stores the "manager" portion of the vtable for a |
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455 | * boost::function object. |
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456 | */ |
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457 | struct vtable_base |
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458 | { |
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459 | vtable_base() : manager(0) { } |
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460 | void (*manager)(const function_buffer& in_buffer, |
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461 | function_buffer& out_buffer, |
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462 | functor_manager_operation_type op); |
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463 | }; |
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464 | } // end namespace function |
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465 | } // end namespace detail |
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466 | |
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467 | /** |
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468 | * The function_base class contains the basic elements needed for the |
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469 | * function1, function2, function3, etc. classes. It is common to all |
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470 | * functions (and as such can be used to tell if we have one of the |
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471 | * functionN objects). |
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472 | */ |
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473 | class function_base |
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474 | { |
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475 | public: |
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476 | function_base() : vtable(0) { } |
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477 | |
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478 | /** Determine if the function is empty (i.e., has no target). */ |
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479 | bool empty() const { return !vtable; } |
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480 | |
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481 | /** Retrieve the type of the stored function object, or typeid(void) |
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482 | if this is empty. */ |
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483 | const std::type_info& target_type() const |
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484 | { |
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485 | if (!vtable) return typeid(void); |
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486 | |
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487 | detail::function::function_buffer type; |
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488 | vtable->manager(functor, type, detail::function::get_functor_type_tag); |
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489 | return *static_cast<const std::type_info*>(type.const_obj_ptr); |
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490 | } |
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491 | |
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492 | template<typename Functor> |
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493 | Functor* target() |
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494 | { |
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495 | if (!vtable) return 0; |
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496 | |
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497 | detail::function::function_buffer type_result; |
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498 | type_result.const_obj_ptr = &typeid(Functor); |
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499 | vtable->manager(functor, type_result, |
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500 | detail::function::check_functor_type_tag); |
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501 | return static_cast<Functor*>(type_result.obj_ptr); |
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502 | } |
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503 | |
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504 | template<typename Functor> |
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505 | #if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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506 | const Functor* target( Functor * = 0 ) const |
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507 | #else |
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508 | const Functor* target() const |
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509 | #endif |
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510 | { |
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511 | if (!vtable) return 0; |
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512 | |
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513 | detail::function::function_buffer type_result; |
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514 | type_result.const_obj_ptr = &typeid(Functor); |
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515 | vtable->manager(functor, type_result, |
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516 | detail::function::check_functor_type_tag); |
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517 | // GCC 2.95.3 gets the CV qualifiers wrong here, so we |
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518 | // can't do the static_cast that we should do. |
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519 | return (const Functor*)(type_result.obj_ptr); |
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520 | } |
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521 | |
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522 | template<typename F> |
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523 | bool contains(const F& f) const |
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524 | { |
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525 | #if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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526 | if (const F* fp = this->target( (F*)0 )) |
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527 | #else |
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528 | if (const F* fp = this->template target<F>()) |
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529 | #endif |
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530 | { |
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531 | return function_equal(*fp, f); |
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532 | } else { |
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533 | return false; |
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534 | } |
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535 | } |
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536 | |
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537 | #if defined(__GNUC__) && __GNUC__ == 3 && __GNUC_MINOR__ <= 3 |
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538 | // GCC 3.3 and newer cannot copy with the global operator==, due to |
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539 | // problems with instantiation of function return types before it |
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540 | // has been verified that the argument types match up. |
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541 | template<typename Functor> |
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542 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
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543 | operator==(Functor g) const |
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544 | { |
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545 | if (const Functor* fp = target<Functor>()) |
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546 | return function_equal(*fp, g); |
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547 | else return false; |
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548 | } |
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549 | |
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550 | template<typename Functor> |
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551 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
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552 | operator!=(Functor g) const |
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553 | { |
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554 | if (const Functor* fp = target<Functor>()) |
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555 | return !function_equal(*fp, g); |
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556 | else return true; |
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557 | } |
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558 | #endif |
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559 | |
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560 | public: // should be protected, but GCC 2.95.3 will fail to allow access |
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561 | detail::function::vtable_base* vtable; |
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562 | mutable detail::function::function_buffer functor; |
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563 | }; |
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564 | |
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565 | /** |
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566 | * The bad_function_call exception class is thrown when a boost::function |
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567 | * object is invoked |
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568 | */ |
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569 | class bad_function_call : public std::runtime_error |
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570 | { |
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571 | public: |
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572 | bad_function_call() : std::runtime_error("call to empty boost::function") {} |
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573 | }; |
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574 | |
---|
575 | #ifndef BOOST_NO_SFINAE |
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576 | inline bool operator==(const function_base& f, |
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577 | detail::function::useless_clear_type*) |
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578 | { |
---|
579 | return f.empty(); |
---|
580 | } |
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581 | |
---|
582 | inline bool operator!=(const function_base& f, |
---|
583 | detail::function::useless_clear_type*) |
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584 | { |
---|
585 | return !f.empty(); |
---|
586 | } |
---|
587 | |
---|
588 | inline bool operator==(detail::function::useless_clear_type*, |
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589 | const function_base& f) |
---|
590 | { |
---|
591 | return f.empty(); |
---|
592 | } |
---|
593 | |
---|
594 | inline bool operator!=(detail::function::useless_clear_type*, |
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595 | const function_base& f) |
---|
596 | { |
---|
597 | return !f.empty(); |
---|
598 | } |
---|
599 | #endif |
---|
600 | |
---|
601 | #ifdef BOOST_NO_SFINAE |
---|
602 | // Comparisons between boost::function objects and arbitrary function objects |
---|
603 | template<typename Functor> |
---|
604 | inline bool operator==(const function_base& f, Functor g) |
---|
605 | { |
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606 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
607 | return detail::function::compare_equal(f, g, 0, integral()); |
---|
608 | } |
---|
609 | |
---|
610 | template<typename Functor> |
---|
611 | inline bool operator==(Functor g, const function_base& f) |
---|
612 | { |
---|
613 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
614 | return detail::function::compare_equal(f, g, 0, integral()); |
---|
615 | } |
---|
616 | |
---|
617 | template<typename Functor> |
---|
618 | inline bool operator!=(const function_base& f, Functor g) |
---|
619 | { |
---|
620 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
621 | return detail::function::compare_not_equal(f, g, 0, integral()); |
---|
622 | } |
---|
623 | |
---|
624 | template<typename Functor> |
---|
625 | inline bool operator!=(Functor g, const function_base& f) |
---|
626 | { |
---|
627 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
628 | return detail::function::compare_not_equal(f, g, 0, integral()); |
---|
629 | } |
---|
630 | #else |
---|
631 | |
---|
632 | # if !(defined(__GNUC__) && __GNUC__ == 3 && __GNUC_MINOR__ <= 3) |
---|
633 | // Comparisons between boost::function objects and arbitrary function |
---|
634 | // objects. GCC 3.3 and before has an obnoxious bug that prevents this |
---|
635 | // from working. |
---|
636 | template<typename Functor> |
---|
637 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
638 | operator==(const function_base& f, Functor g) |
---|
639 | { |
---|
640 | if (const Functor* fp = f.template target<Functor>()) |
---|
641 | return function_equal(*fp, g); |
---|
642 | else return false; |
---|
643 | } |
---|
644 | |
---|
645 | template<typename Functor> |
---|
646 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
647 | operator==(Functor g, const function_base& f) |
---|
648 | { |
---|
649 | if (const Functor* fp = f.template target<Functor>()) |
---|
650 | return function_equal(g, *fp); |
---|
651 | else return false; |
---|
652 | } |
---|
653 | |
---|
654 | template<typename Functor> |
---|
655 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
656 | operator!=(const function_base& f, Functor g) |
---|
657 | { |
---|
658 | if (const Functor* fp = f.template target<Functor>()) |
---|
659 | return !function_equal(*fp, g); |
---|
660 | else return true; |
---|
661 | } |
---|
662 | |
---|
663 | template<typename Functor> |
---|
664 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
665 | operator!=(Functor g, const function_base& f) |
---|
666 | { |
---|
667 | if (const Functor* fp = f.template target<Functor>()) |
---|
668 | return !function_equal(g, *fp); |
---|
669 | else return true; |
---|
670 | } |
---|
671 | # endif |
---|
672 | |
---|
673 | template<typename Functor> |
---|
674 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
675 | operator==(const function_base& f, reference_wrapper<Functor> g) |
---|
676 | { |
---|
677 | if (const Functor* fp = f.template target<Functor>()) |
---|
678 | return fp == g.get_pointer(); |
---|
679 | else return false; |
---|
680 | } |
---|
681 | |
---|
682 | template<typename Functor> |
---|
683 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
684 | operator==(reference_wrapper<Functor> g, const function_base& f) |
---|
685 | { |
---|
686 | if (const Functor* fp = f.template target<Functor>()) |
---|
687 | return g.get_pointer() == fp; |
---|
688 | else return false; |
---|
689 | } |
---|
690 | |
---|
691 | template<typename Functor> |
---|
692 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
693 | operator!=(const function_base& f, reference_wrapper<Functor> g) |
---|
694 | { |
---|
695 | if (const Functor* fp = f.template target<Functor>()) |
---|
696 | return fp != g.get_pointer(); |
---|
697 | else return true; |
---|
698 | } |
---|
699 | |
---|
700 | template<typename Functor> |
---|
701 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
702 | operator!=(reference_wrapper<Functor> g, const function_base& f) |
---|
703 | { |
---|
704 | if (const Functor* fp = f.template target<Functor>()) |
---|
705 | return g.get_pointer() != fp; |
---|
706 | else return true; |
---|
707 | } |
---|
708 | |
---|
709 | #endif // Compiler supporting SFINAE |
---|
710 | |
---|
711 | namespace detail { |
---|
712 | namespace function { |
---|
713 | inline bool has_empty_target(const function_base* f) |
---|
714 | { |
---|
715 | return f->empty(); |
---|
716 | } |
---|
717 | |
---|
718 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1310) |
---|
719 | inline bool has_empty_target(const void*) |
---|
720 | { |
---|
721 | return false; |
---|
722 | } |
---|
723 | #else |
---|
724 | inline bool has_empty_target(...) |
---|
725 | { |
---|
726 | return false; |
---|
727 | } |
---|
728 | #endif |
---|
729 | } // end namespace function |
---|
730 | } // end namespace detail |
---|
731 | } // end namespace boost |
---|
732 | |
---|
733 | #undef BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL |
---|
734 | #undef BOOST_FUNCTION_COMPARE_TYPE_ID |
---|
735 | |
---|
736 | #endif // BOOST_FUNCTION_BASE_HEADER |
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