1 | // Boost.Function library |
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2 | |
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3 | // Copyright Douglas Gregor 2001-2006 |
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4 | // Copyright Emil Dotchevski 2007 |
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5 | // Use, modification and distribution is subject to the Boost Software License, Version 1.0. |
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6 | // (See accompanying file LICENSE_1_0.txt or copy at |
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7 | // http://www.boost.org/LICENSE_1_0.txt) |
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8 | |
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9 | // For more information, see http://www.boost.org |
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10 | |
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11 | #ifndef BOOST_FUNCTION_BASE_HEADER |
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12 | #define BOOST_FUNCTION_BASE_HEADER |
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13 | |
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14 | #include <stdexcept> |
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15 | #include <string> |
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16 | #include <memory> |
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17 | #include <new> |
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18 | #include <boost/config.hpp> |
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19 | #include <boost/detail/sp_typeinfo.hpp> |
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20 | #include <boost/assert.hpp> |
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21 | #include <boost/integer.hpp> |
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22 | #include <boost/type_traits/has_trivial_copy.hpp> |
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23 | #include <boost/type_traits/has_trivial_destructor.hpp> |
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24 | #include <boost/type_traits/is_const.hpp> |
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25 | #include <boost/type_traits/is_integral.hpp> |
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26 | #include <boost/type_traits/is_volatile.hpp> |
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27 | #include <boost/type_traits/composite_traits.hpp> |
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28 | #include <boost/type_traits/ice.hpp> |
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29 | #include <boost/ref.hpp> |
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30 | #include <boost/mpl/if.hpp> |
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31 | #include <boost/detail/workaround.hpp> |
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32 | #include <boost/type_traits/alignment_of.hpp> |
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33 | #ifndef BOOST_NO_SFINAE |
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34 | # include "boost/utility/enable_if.hpp" |
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35 | #else |
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36 | # include "boost/mpl/bool.hpp" |
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37 | #endif |
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38 | #include <boost/function_equal.hpp> |
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39 | #include <boost/function/function_fwd.hpp> |
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40 | |
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41 | #if defined(BOOST_MSVC) |
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42 | # pragma warning( push ) |
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43 | # pragma warning( disable : 4793 ) // complaint about native code generation |
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44 | # pragma warning( disable : 4127 ) // "conditional expression is constant" |
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45 | #endif |
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46 | |
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47 | // Define BOOST_FUNCTION_STD_NS to the namespace that contains type_info. |
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48 | #ifdef BOOST_NO_STD_TYPEINFO |
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49 | // Embedded VC++ does not have type_info in namespace std |
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50 | # define BOOST_FUNCTION_STD_NS |
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51 | #else |
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52 | # define BOOST_FUNCTION_STD_NS std |
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53 | #endif |
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54 | |
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55 | // Borrowed from Boost.Python library: determines the cases where we |
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56 | // need to use std::type_info::name to compare instead of operator==. |
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57 | #if defined( BOOST_NO_TYPEID ) |
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58 | # define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) ((X)==(Y)) |
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59 | #elif (defined(__GNUC__) && __GNUC__ >= 3) \ |
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60 | || defined(_AIX) \ |
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61 | || ( defined(__sgi) && defined(__host_mips)) |
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62 | # include <cstring> |
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63 | # define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) \ |
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64 | (std::strcmp((X).name(),(Y).name()) == 0) |
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65 | # else |
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66 | # define BOOST_FUNCTION_COMPARE_TYPE_ID(X,Y) ((X)==(Y)) |
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67 | #endif |
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68 | |
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69 | #if defined(BOOST_MSVC) && BOOST_MSVC <= 1300 || defined(__ICL) && __ICL <= 600 || defined(__MWERKS__) && __MWERKS__ < 0x2406 && !defined(BOOST_STRICT_CONFIG) |
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70 | # define BOOST_FUNCTION_TARGET_FIX(x) x |
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71 | #else |
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72 | # define BOOST_FUNCTION_TARGET_FIX(x) |
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73 | #endif // not MSVC |
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74 | |
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75 | #if !BOOST_WORKAROUND(__BORLANDC__, < 0x5A0) |
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76 | # define BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor,Type) \ |
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77 | typename ::boost::enable_if_c<(::boost::type_traits::ice_not< \ |
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78 | (::boost::is_integral<Functor>::value)>::value), \ |
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79 | Type>::type |
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80 | #else |
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81 | // BCC doesn't recognize this depends on a template argument and complains |
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82 | // about the use of 'typename' |
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83 | # define BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor,Type) \ |
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84 | ::boost::enable_if_c<(::boost::type_traits::ice_not< \ |
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85 | (::boost::is_integral<Functor>::value)>::value), \ |
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86 | Type>::type |
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87 | #endif |
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88 | |
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89 | namespace boost { |
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90 | namespace detail { |
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91 | namespace function { |
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92 | class X; |
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93 | |
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94 | /** |
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95 | * A buffer used to store small function objects in |
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96 | * boost::function. It is a union containing function pointers, |
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97 | * object pointers, and a structure that resembles a bound |
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98 | * member function pointer. |
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99 | */ |
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100 | union function_buffer |
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101 | { |
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102 | // For pointers to function objects |
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103 | mutable void* obj_ptr; |
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104 | |
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105 | // For pointers to std::type_info objects |
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106 | struct type_t { |
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107 | // (get_functor_type_tag, check_functor_type_tag). |
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108 | const detail::sp_typeinfo* type; |
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109 | |
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110 | // Whether the type is const-qualified. |
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111 | bool const_qualified; |
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112 | // Whether the type is volatile-qualified. |
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113 | bool volatile_qualified; |
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114 | } type; |
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115 | |
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116 | // For function pointers of all kinds |
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117 | mutable void (*func_ptr)(); |
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118 | |
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119 | // For bound member pointers |
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120 | struct bound_memfunc_ptr_t { |
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121 | void (X::*memfunc_ptr)(int); |
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122 | void* obj_ptr; |
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123 | } bound_memfunc_ptr; |
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124 | |
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125 | // For references to function objects. We explicitly keep |
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126 | // track of the cv-qualifiers on the object referenced. |
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127 | struct obj_ref_t { |
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128 | mutable void* obj_ptr; |
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129 | bool is_const_qualified; |
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130 | bool is_volatile_qualified; |
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131 | } obj_ref; |
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132 | |
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133 | // To relax aliasing constraints |
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134 | mutable char data; |
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135 | }; |
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136 | |
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137 | /** |
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138 | * The unusable class is a placeholder for unused function arguments |
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139 | * It is also completely unusable except that it constructable from |
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140 | * anything. This helps compilers without partial specialization to |
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141 | * handle Boost.Function objects returning void. |
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142 | */ |
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143 | struct unusable |
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144 | { |
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145 | unusable() {} |
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146 | template<typename T> unusable(const T&) {} |
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147 | }; |
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148 | |
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149 | /* Determine the return type. This supports compilers that do not support |
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150 | * void returns or partial specialization by silently changing the return |
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151 | * type to "unusable". |
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152 | */ |
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153 | template<typename T> struct function_return_type { typedef T type; }; |
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154 | |
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155 | template<> |
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156 | struct function_return_type<void> |
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157 | { |
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158 | typedef unusable type; |
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159 | }; |
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160 | |
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161 | // The operation type to perform on the given functor/function pointer |
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162 | enum functor_manager_operation_type { |
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163 | clone_functor_tag, |
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164 | move_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 | manage(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_ref.obj_ptr = in_buffer.obj_ref.obj_ptr; |
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207 | return; |
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208 | |
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209 | case move_functor_tag: |
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210 | out_buffer.obj_ref.obj_ptr = in_buffer.obj_ref.obj_ptr; |
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211 | in_buffer.obj_ref.obj_ptr = 0; |
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212 | return; |
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213 | |
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214 | case destroy_functor_tag: |
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215 | out_buffer.obj_ref.obj_ptr = 0; |
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216 | return; |
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217 | |
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218 | case check_functor_type_tag: |
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219 | { |
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220 | const detail::sp_typeinfo& check_type |
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221 | = *out_buffer.type.type; |
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222 | |
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223 | // Check whether we have the same type. We can add |
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224 | // cv-qualifiers, but we can't take them away. |
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225 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, BOOST_SP_TYPEID(F)) |
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226 | && (!in_buffer.obj_ref.is_const_qualified |
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227 | || out_buffer.type.const_qualified) |
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228 | && (!in_buffer.obj_ref.is_volatile_qualified |
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229 | || out_buffer.type.volatile_qualified)) |
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230 | out_buffer.obj_ptr = in_buffer.obj_ref.obj_ptr; |
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231 | else |
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232 | out_buffer.obj_ptr = 0; |
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233 | } |
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234 | return; |
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235 | |
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236 | case get_functor_type_tag: |
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237 | out_buffer.type.type = &BOOST_SP_TYPEID(F); |
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238 | out_buffer.type.const_qualified = in_buffer.obj_ref.is_const_qualified; |
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239 | out_buffer.type.volatile_qualified = in_buffer.obj_ref.is_volatile_qualified; |
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240 | return; |
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241 | } |
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242 | } |
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243 | }; |
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244 | |
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245 | /** |
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246 | * Determine if boost::function can use the small-object |
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247 | * optimization with the function object type F. |
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248 | */ |
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249 | template<typename F> |
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250 | struct function_allows_small_object_optimization |
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251 | { |
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252 | BOOST_STATIC_CONSTANT |
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253 | (bool, |
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254 | value = ((sizeof(F) <= sizeof(function_buffer) && |
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255 | (alignment_of<function_buffer>::value |
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256 | % alignment_of<F>::value == 0)))); |
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257 | }; |
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258 | |
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259 | template <typename F,typename A> |
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260 | struct functor_wrapper: public F, public A |
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261 | { |
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262 | functor_wrapper( F f, A a ): |
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263 | F(f), |
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264 | A(a) |
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265 | { |
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266 | } |
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267 | |
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268 | functor_wrapper(const functor_wrapper& f) : |
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269 | F(static_cast<const F&>(f)), |
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270 | A(static_cast<const A&>(f)) |
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271 | { |
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272 | } |
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273 | }; |
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274 | |
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275 | /** |
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276 | * The functor_manager class contains a static function "manage" which |
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277 | * can clone or destroy the given function/function object pointer. |
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278 | */ |
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279 | template<typename Functor> |
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280 | struct functor_manager_common |
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281 | { |
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282 | typedef Functor functor_type; |
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283 | |
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284 | // Function pointers |
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285 | static inline void |
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286 | manage_ptr(const function_buffer& in_buffer, function_buffer& out_buffer, |
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287 | functor_manager_operation_type op) |
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288 | { |
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289 | if (op == clone_functor_tag) |
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290 | out_buffer.func_ptr = in_buffer.func_ptr; |
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291 | else if (op == move_functor_tag) { |
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292 | out_buffer.func_ptr = in_buffer.func_ptr; |
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293 | in_buffer.func_ptr = 0; |
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294 | } else if (op == destroy_functor_tag) |
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295 | out_buffer.func_ptr = 0; |
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296 | else if (op == check_functor_type_tag) { |
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297 | const detail::sp_typeinfo& check_type |
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298 | = *out_buffer.type.type; |
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299 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, BOOST_SP_TYPEID(Functor))) |
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300 | out_buffer.obj_ptr = &in_buffer.func_ptr; |
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301 | else |
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302 | out_buffer.obj_ptr = 0; |
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303 | } else /* op == get_functor_type_tag */ { |
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304 | out_buffer.type.type = &BOOST_SP_TYPEID(Functor); |
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305 | out_buffer.type.const_qualified = false; |
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306 | out_buffer.type.volatile_qualified = false; |
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307 | } |
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308 | } |
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309 | |
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310 | // Function objects that fit in the small-object buffer. |
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311 | static inline void |
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312 | manage_small(const function_buffer& in_buffer, function_buffer& out_buffer, |
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313 | functor_manager_operation_type op) |
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314 | { |
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315 | if (op == clone_functor_tag || op == move_functor_tag) { |
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316 | const functor_type* in_functor = |
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317 | reinterpret_cast<const functor_type*>(&in_buffer.data); |
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318 | new ((void*)&out_buffer.data) functor_type(*in_functor); |
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319 | |
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320 | if (op == move_functor_tag) { |
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321 | reinterpret_cast<functor_type*>(&in_buffer.data)->~Functor(); |
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322 | } |
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323 | } else if (op == destroy_functor_tag) { |
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324 | // Some compilers (Borland, vc6, ...) are unhappy with ~functor_type. |
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325 | reinterpret_cast<functor_type*>(&out_buffer.data)->~Functor(); |
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326 | } else if (op == check_functor_type_tag) { |
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327 | const detail::sp_typeinfo& check_type |
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328 | = *out_buffer.type.type; |
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329 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, BOOST_SP_TYPEID(Functor))) |
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330 | out_buffer.obj_ptr = &in_buffer.data; |
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331 | else |
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332 | out_buffer.obj_ptr = 0; |
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333 | } else /* op == get_functor_type_tag */ { |
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334 | out_buffer.type.type = &BOOST_SP_TYPEID(Functor); |
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335 | out_buffer.type.const_qualified = false; |
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336 | out_buffer.type.volatile_qualified = false; |
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337 | } |
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338 | } |
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339 | }; |
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340 | |
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341 | template<typename Functor> |
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342 | struct functor_manager |
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343 | { |
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344 | private: |
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345 | typedef Functor functor_type; |
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346 | |
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347 | // Function pointers |
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348 | static inline void |
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349 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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350 | functor_manager_operation_type op, function_ptr_tag) |
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351 | { |
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352 | functor_manager_common<Functor>::manage_ptr(in_buffer,out_buffer,op); |
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353 | } |
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354 | |
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355 | // Function objects that fit in the small-object buffer. |
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356 | static inline void |
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357 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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358 | functor_manager_operation_type op, mpl::true_) |
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359 | { |
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360 | functor_manager_common<Functor>::manage_small(in_buffer,out_buffer,op); |
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361 | } |
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362 | |
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363 | // Function objects that require heap allocation |
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364 | static inline void |
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365 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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366 | functor_manager_operation_type op, mpl::false_) |
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367 | { |
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368 | if (op == clone_functor_tag) { |
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369 | // Clone the functor |
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370 | // GCC 2.95.3 gets the CV qualifiers wrong here, so we |
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371 | // can't do the static_cast that we should do. |
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372 | const functor_type* f = |
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373 | (const functor_type*)(in_buffer.obj_ptr); |
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374 | functor_type* new_f = new functor_type(*f); |
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375 | out_buffer.obj_ptr = new_f; |
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376 | } else if (op == move_functor_tag) { |
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377 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
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378 | in_buffer.obj_ptr = 0; |
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379 | } else if (op == destroy_functor_tag) { |
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380 | /* Cast from the void pointer to the functor pointer type */ |
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381 | functor_type* f = |
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382 | static_cast<functor_type*>(out_buffer.obj_ptr); |
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383 | delete f; |
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384 | out_buffer.obj_ptr = 0; |
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385 | } else if (op == check_functor_type_tag) { |
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386 | const detail::sp_typeinfo& check_type |
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387 | = *out_buffer.type.type; |
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388 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, BOOST_SP_TYPEID(Functor))) |
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389 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
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390 | else |
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391 | out_buffer.obj_ptr = 0; |
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392 | } else /* op == get_functor_type_tag */ { |
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393 | out_buffer.type.type = &BOOST_SP_TYPEID(Functor); |
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394 | out_buffer.type.const_qualified = false; |
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395 | out_buffer.type.volatile_qualified = false; |
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396 | } |
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397 | } |
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398 | |
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399 | // For function objects, we determine whether the function |
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400 | // object can use the small-object optimization buffer or |
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401 | // whether we need to allocate it on the heap. |
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402 | static inline void |
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403 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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404 | functor_manager_operation_type op, function_obj_tag) |
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405 | { |
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406 | manager(in_buffer, out_buffer, op, |
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407 | mpl::bool_<(function_allows_small_object_optimization<functor_type>::value)>()); |
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408 | } |
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409 | |
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410 | // For member pointers, we use the small-object optimization buffer. |
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411 | static inline void |
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412 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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413 | functor_manager_operation_type op, member_ptr_tag) |
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414 | { |
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415 | manager(in_buffer, out_buffer, op, mpl::true_()); |
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416 | } |
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417 | |
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418 | public: |
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419 | /* Dispatch to an appropriate manager based on whether we have a |
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420 | function pointer or a function object pointer. */ |
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421 | static inline void |
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422 | manage(const function_buffer& in_buffer, function_buffer& out_buffer, |
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423 | functor_manager_operation_type op) |
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424 | { |
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425 | typedef typename get_function_tag<functor_type>::type tag_type; |
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426 | switch (op) { |
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427 | case get_functor_type_tag: |
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428 | out_buffer.type.type = &BOOST_SP_TYPEID(functor_type); |
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429 | out_buffer.type.const_qualified = false; |
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430 | out_buffer.type.volatile_qualified = false; |
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431 | return; |
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432 | |
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433 | default: |
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434 | manager(in_buffer, out_buffer, op, tag_type()); |
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435 | return; |
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436 | } |
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437 | } |
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438 | }; |
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439 | |
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440 | template<typename Functor, typename Allocator> |
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441 | struct functor_manager_a |
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442 | { |
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443 | private: |
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444 | typedef Functor functor_type; |
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445 | |
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446 | // Function pointers |
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447 | static inline void |
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448 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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449 | functor_manager_operation_type op, function_ptr_tag) |
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450 | { |
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451 | functor_manager_common<Functor>::manage_ptr(in_buffer,out_buffer,op); |
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452 | } |
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453 | |
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454 | // Function objects that fit in the small-object buffer. |
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455 | static inline void |
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456 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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457 | functor_manager_operation_type op, mpl::true_) |
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458 | { |
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459 | functor_manager_common<Functor>::manage_small(in_buffer,out_buffer,op); |
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460 | } |
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461 | |
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462 | // Function objects that require heap allocation |
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463 | static inline void |
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464 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
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465 | functor_manager_operation_type op, mpl::false_) |
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466 | { |
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467 | typedef functor_wrapper<Functor,Allocator> functor_wrapper_type; |
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468 | typedef typename Allocator::template rebind<functor_wrapper_type>::other |
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469 | wrapper_allocator_type; |
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470 | typedef typename wrapper_allocator_type::pointer wrapper_allocator_pointer_type; |
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471 | |
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472 | if (op == clone_functor_tag) { |
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473 | // Clone the functor |
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474 | // GCC 2.95.3 gets the CV qualifiers wrong here, so we |
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475 | // can't do the static_cast that we should do. |
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476 | const functor_wrapper_type* f = |
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477 | (const functor_wrapper_type*)(in_buffer.obj_ptr); |
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478 | wrapper_allocator_type wrapper_allocator(static_cast<Allocator const &>(*f)); |
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479 | wrapper_allocator_pointer_type copy = wrapper_allocator.allocate(1); |
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480 | wrapper_allocator.construct(copy, *f); |
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481 | |
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482 | // Get back to the original pointer type |
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483 | functor_wrapper_type* new_f = static_cast<functor_wrapper_type*>(copy); |
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484 | out_buffer.obj_ptr = new_f; |
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485 | } else if (op == move_functor_tag) { |
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486 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
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487 | in_buffer.obj_ptr = 0; |
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488 | } else if (op == destroy_functor_tag) { |
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489 | /* Cast from the void pointer to the functor_wrapper_type */ |
---|
490 | functor_wrapper_type* victim = |
---|
491 | static_cast<functor_wrapper_type*>(in_buffer.obj_ptr); |
---|
492 | wrapper_allocator_type wrapper_allocator(static_cast<Allocator const &>(*victim)); |
---|
493 | wrapper_allocator.destroy(victim); |
---|
494 | wrapper_allocator.deallocate(victim,1); |
---|
495 | out_buffer.obj_ptr = 0; |
---|
496 | } else if (op == check_functor_type_tag) { |
---|
497 | const detail::sp_typeinfo& check_type |
---|
498 | = *out_buffer.type.type; |
---|
499 | if (BOOST_FUNCTION_COMPARE_TYPE_ID(check_type, BOOST_SP_TYPEID(Functor))) |
---|
500 | out_buffer.obj_ptr = in_buffer.obj_ptr; |
---|
501 | else |
---|
502 | out_buffer.obj_ptr = 0; |
---|
503 | } else /* op == get_functor_type_tag */ { |
---|
504 | out_buffer.type.type = &BOOST_SP_TYPEID(Functor); |
---|
505 | out_buffer.type.const_qualified = false; |
---|
506 | out_buffer.type.volatile_qualified = false; |
---|
507 | } |
---|
508 | } |
---|
509 | |
---|
510 | // For function objects, we determine whether the function |
---|
511 | // object can use the small-object optimization buffer or |
---|
512 | // whether we need to allocate it on the heap. |
---|
513 | static inline void |
---|
514 | manager(const function_buffer& in_buffer, function_buffer& out_buffer, |
---|
515 | functor_manager_operation_type op, function_obj_tag) |
---|
516 | { |
---|
517 | manager(in_buffer, out_buffer, op, |
---|
518 | mpl::bool_<(function_allows_small_object_optimization<functor_type>::value)>()); |
---|
519 | } |
---|
520 | |
---|
521 | public: |
---|
522 | /* Dispatch to an appropriate manager based on whether we have a |
---|
523 | function pointer or a function object pointer. */ |
---|
524 | static inline void |
---|
525 | manage(const function_buffer& in_buffer, function_buffer& out_buffer, |
---|
526 | functor_manager_operation_type op) |
---|
527 | { |
---|
528 | typedef typename get_function_tag<functor_type>::type tag_type; |
---|
529 | switch (op) { |
---|
530 | case get_functor_type_tag: |
---|
531 | out_buffer.type.type = &BOOST_SP_TYPEID(functor_type); |
---|
532 | out_buffer.type.const_qualified = false; |
---|
533 | out_buffer.type.volatile_qualified = false; |
---|
534 | return; |
---|
535 | |
---|
536 | default: |
---|
537 | manager(in_buffer, out_buffer, op, tag_type()); |
---|
538 | return; |
---|
539 | } |
---|
540 | } |
---|
541 | }; |
---|
542 | |
---|
543 | // A type that is only used for comparisons against zero |
---|
544 | struct useless_clear_type {}; |
---|
545 | |
---|
546 | #ifdef BOOST_NO_SFINAE |
---|
547 | // These routines perform comparisons between a Boost.Function |
---|
548 | // object and an arbitrary function object (when the last |
---|
549 | // parameter is mpl::bool_<false>) or against zero (when the |
---|
550 | // last parameter is mpl::bool_<true>). They are only necessary |
---|
551 | // for compilers that don't support SFINAE. |
---|
552 | template<typename Function, typename Functor> |
---|
553 | bool |
---|
554 | compare_equal(const Function& f, const Functor&, int, mpl::bool_<true>) |
---|
555 | { return f.empty(); } |
---|
556 | |
---|
557 | template<typename Function, typename Functor> |
---|
558 | bool |
---|
559 | compare_not_equal(const Function& f, const Functor&, int, |
---|
560 | mpl::bool_<true>) |
---|
561 | { return !f.empty(); } |
---|
562 | |
---|
563 | template<typename Function, typename Functor> |
---|
564 | bool |
---|
565 | compare_equal(const Function& f, const Functor& g, long, |
---|
566 | mpl::bool_<false>) |
---|
567 | { |
---|
568 | if (const Functor* fp = f.template target<Functor>()) |
---|
569 | return function_equal(*fp, g); |
---|
570 | else return false; |
---|
571 | } |
---|
572 | |
---|
573 | template<typename Function, typename Functor> |
---|
574 | bool |
---|
575 | compare_equal(const Function& f, const reference_wrapper<Functor>& g, |
---|
576 | int, mpl::bool_<false>) |
---|
577 | { |
---|
578 | if (const Functor* fp = f.template target<Functor>()) |
---|
579 | return fp == g.get_pointer(); |
---|
580 | else return false; |
---|
581 | } |
---|
582 | |
---|
583 | template<typename Function, typename Functor> |
---|
584 | bool |
---|
585 | compare_not_equal(const Function& f, const Functor& g, long, |
---|
586 | mpl::bool_<false>) |
---|
587 | { |
---|
588 | if (const Functor* fp = f.template target<Functor>()) |
---|
589 | return !function_equal(*fp, g); |
---|
590 | else return true; |
---|
591 | } |
---|
592 | |
---|
593 | template<typename Function, typename Functor> |
---|
594 | bool |
---|
595 | compare_not_equal(const Function& f, |
---|
596 | const reference_wrapper<Functor>& g, int, |
---|
597 | mpl::bool_<false>) |
---|
598 | { |
---|
599 | if (const Functor* fp = f.template target<Functor>()) |
---|
600 | return fp != g.get_pointer(); |
---|
601 | else return true; |
---|
602 | } |
---|
603 | #endif // BOOST_NO_SFINAE |
---|
604 | |
---|
605 | /** |
---|
606 | * Stores the "manager" portion of the vtable for a |
---|
607 | * boost::function object. |
---|
608 | */ |
---|
609 | struct vtable_base |
---|
610 | { |
---|
611 | void (*manager)(const function_buffer& in_buffer, |
---|
612 | function_buffer& out_buffer, |
---|
613 | functor_manager_operation_type op); |
---|
614 | }; |
---|
615 | } // end namespace function |
---|
616 | } // end namespace detail |
---|
617 | |
---|
618 | /** |
---|
619 | * The function_base class contains the basic elements needed for the |
---|
620 | * function1, function2, function3, etc. classes. It is common to all |
---|
621 | * functions (and as such can be used to tell if we have one of the |
---|
622 | * functionN objects). |
---|
623 | */ |
---|
624 | class function_base |
---|
625 | { |
---|
626 | public: |
---|
627 | function_base() : vtable(0) { } |
---|
628 | |
---|
629 | /** Determine if the function is empty (i.e., has no target). */ |
---|
630 | bool empty() const { return !vtable; } |
---|
631 | |
---|
632 | /** Retrieve the type of the stored function object, or BOOST_SP_TYPEID(void) |
---|
633 | if this is empty. */ |
---|
634 | const detail::sp_typeinfo& target_type() const |
---|
635 | { |
---|
636 | if (!vtable) return BOOST_SP_TYPEID(void); |
---|
637 | |
---|
638 | detail::function::function_buffer type; |
---|
639 | get_vtable()->manager(functor, type, detail::function::get_functor_type_tag); |
---|
640 | return *type.type.type; |
---|
641 | } |
---|
642 | |
---|
643 | template<typename Functor> |
---|
644 | Functor* target() |
---|
645 | { |
---|
646 | if (!vtable) return 0; |
---|
647 | |
---|
648 | detail::function::function_buffer type_result; |
---|
649 | type_result.type.type = &BOOST_SP_TYPEID(Functor); |
---|
650 | type_result.type.const_qualified = is_const<Functor>::value; |
---|
651 | type_result.type.volatile_qualified = is_volatile<Functor>::value; |
---|
652 | get_vtable()->manager(functor, type_result, |
---|
653 | detail::function::check_functor_type_tag); |
---|
654 | return static_cast<Functor*>(type_result.obj_ptr); |
---|
655 | } |
---|
656 | |
---|
657 | template<typename Functor> |
---|
658 | #if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
---|
659 | const Functor* target( Functor * = 0 ) const |
---|
660 | #else |
---|
661 | const Functor* target() const |
---|
662 | #endif |
---|
663 | { |
---|
664 | if (!vtable) return 0; |
---|
665 | |
---|
666 | detail::function::function_buffer type_result; |
---|
667 | type_result.type.type = &BOOST_SP_TYPEID(Functor); |
---|
668 | type_result.type.const_qualified = true; |
---|
669 | type_result.type.volatile_qualified = is_volatile<Functor>::value; |
---|
670 | get_vtable()->manager(functor, type_result, |
---|
671 | detail::function::check_functor_type_tag); |
---|
672 | // GCC 2.95.3 gets the CV qualifiers wrong here, so we |
---|
673 | // can't do the static_cast that we should do. |
---|
674 | return (const Functor*)(type_result.obj_ptr); |
---|
675 | } |
---|
676 | |
---|
677 | template<typename F> |
---|
678 | bool contains(const F& f) const |
---|
679 | { |
---|
680 | #if defined(BOOST_MSVC) && BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
---|
681 | if (const F* fp = this->target( (F*)0 )) |
---|
682 | #else |
---|
683 | if (const F* fp = this->template target<F>()) |
---|
684 | #endif |
---|
685 | { |
---|
686 | return function_equal(*fp, f); |
---|
687 | } else { |
---|
688 | return false; |
---|
689 | } |
---|
690 | } |
---|
691 | |
---|
692 | #if defined(__GNUC__) && __GNUC__ == 3 && __GNUC_MINOR__ <= 3 |
---|
693 | // GCC 3.3 and newer cannot copy with the global operator==, due to |
---|
694 | // problems with instantiation of function return types before it |
---|
695 | // has been verified that the argument types match up. |
---|
696 | template<typename Functor> |
---|
697 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
698 | operator==(Functor g) const |
---|
699 | { |
---|
700 | if (const Functor* fp = target<Functor>()) |
---|
701 | return function_equal(*fp, g); |
---|
702 | else return false; |
---|
703 | } |
---|
704 | |
---|
705 | template<typename Functor> |
---|
706 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
707 | operator!=(Functor g) const |
---|
708 | { |
---|
709 | if (const Functor* fp = target<Functor>()) |
---|
710 | return !function_equal(*fp, g); |
---|
711 | else return true; |
---|
712 | } |
---|
713 | #endif |
---|
714 | |
---|
715 | public: // should be protected, but GCC 2.95.3 will fail to allow access |
---|
716 | detail::function::vtable_base* get_vtable() const { |
---|
717 | return reinterpret_cast<detail::function::vtable_base*>( |
---|
718 | reinterpret_cast<std::size_t>(vtable) & ~(std::size_t)0x01); |
---|
719 | |
---|
720 | } |
---|
721 | |
---|
722 | bool has_trivial_copy_and_destroy() const { |
---|
723 | return reinterpret_cast<std::size_t>(vtable) & 0x01; |
---|
724 | } |
---|
725 | |
---|
726 | detail::function::vtable_base* vtable; |
---|
727 | mutable detail::function::function_buffer functor; |
---|
728 | }; |
---|
729 | |
---|
730 | /** |
---|
731 | * The bad_function_call exception class is thrown when a boost::function |
---|
732 | * object is invoked |
---|
733 | */ |
---|
734 | class bad_function_call : public std::runtime_error |
---|
735 | { |
---|
736 | public: |
---|
737 | bad_function_call() : std::runtime_error("call to empty boost::function") {} |
---|
738 | }; |
---|
739 | |
---|
740 | #ifndef BOOST_NO_SFINAE |
---|
741 | inline bool operator==(const function_base& f, |
---|
742 | detail::function::useless_clear_type*) |
---|
743 | { |
---|
744 | return f.empty(); |
---|
745 | } |
---|
746 | |
---|
747 | inline bool operator!=(const function_base& f, |
---|
748 | detail::function::useless_clear_type*) |
---|
749 | { |
---|
750 | return !f.empty(); |
---|
751 | } |
---|
752 | |
---|
753 | inline bool operator==(detail::function::useless_clear_type*, |
---|
754 | const function_base& f) |
---|
755 | { |
---|
756 | return f.empty(); |
---|
757 | } |
---|
758 | |
---|
759 | inline bool operator!=(detail::function::useless_clear_type*, |
---|
760 | const function_base& f) |
---|
761 | { |
---|
762 | return !f.empty(); |
---|
763 | } |
---|
764 | #endif |
---|
765 | |
---|
766 | #ifdef BOOST_NO_SFINAE |
---|
767 | // Comparisons between boost::function objects and arbitrary function objects |
---|
768 | template<typename Functor> |
---|
769 | inline bool operator==(const function_base& f, Functor g) |
---|
770 | { |
---|
771 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
772 | return detail::function::compare_equal(f, g, 0, integral()); |
---|
773 | } |
---|
774 | |
---|
775 | template<typename Functor> |
---|
776 | inline bool operator==(Functor g, const function_base& f) |
---|
777 | { |
---|
778 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
779 | return detail::function::compare_equal(f, g, 0, integral()); |
---|
780 | } |
---|
781 | |
---|
782 | template<typename Functor> |
---|
783 | inline bool operator!=(const function_base& f, Functor g) |
---|
784 | { |
---|
785 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
786 | return detail::function::compare_not_equal(f, g, 0, integral()); |
---|
787 | } |
---|
788 | |
---|
789 | template<typename Functor> |
---|
790 | inline bool operator!=(Functor g, const function_base& f) |
---|
791 | { |
---|
792 | typedef mpl::bool_<(is_integral<Functor>::value)> integral; |
---|
793 | return detail::function::compare_not_equal(f, g, 0, integral()); |
---|
794 | } |
---|
795 | #else |
---|
796 | |
---|
797 | # if !(defined(__GNUC__) && __GNUC__ == 3 && __GNUC_MINOR__ <= 3) |
---|
798 | // Comparisons between boost::function objects and arbitrary function |
---|
799 | // objects. GCC 3.3 and before has an obnoxious bug that prevents this |
---|
800 | // from working. |
---|
801 | template<typename Functor> |
---|
802 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
803 | operator==(const function_base& f, Functor g) |
---|
804 | { |
---|
805 | if (const Functor* fp = f.template target<Functor>()) |
---|
806 | return function_equal(*fp, g); |
---|
807 | else return false; |
---|
808 | } |
---|
809 | |
---|
810 | template<typename Functor> |
---|
811 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
812 | operator==(Functor g, const function_base& f) |
---|
813 | { |
---|
814 | if (const Functor* fp = f.template target<Functor>()) |
---|
815 | return function_equal(g, *fp); |
---|
816 | else return false; |
---|
817 | } |
---|
818 | |
---|
819 | template<typename Functor> |
---|
820 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
821 | operator!=(const function_base& f, Functor g) |
---|
822 | { |
---|
823 | if (const Functor* fp = f.template target<Functor>()) |
---|
824 | return !function_equal(*fp, g); |
---|
825 | else return true; |
---|
826 | } |
---|
827 | |
---|
828 | template<typename Functor> |
---|
829 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
830 | operator!=(Functor g, const function_base& f) |
---|
831 | { |
---|
832 | if (const Functor* fp = f.template target<Functor>()) |
---|
833 | return !function_equal(g, *fp); |
---|
834 | else return true; |
---|
835 | } |
---|
836 | # endif |
---|
837 | |
---|
838 | template<typename Functor> |
---|
839 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
840 | operator==(const function_base& f, reference_wrapper<Functor> g) |
---|
841 | { |
---|
842 | if (const Functor* fp = f.template target<Functor>()) |
---|
843 | return fp == g.get_pointer(); |
---|
844 | else return false; |
---|
845 | } |
---|
846 | |
---|
847 | template<typename Functor> |
---|
848 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
849 | operator==(reference_wrapper<Functor> g, const function_base& f) |
---|
850 | { |
---|
851 | if (const Functor* fp = f.template target<Functor>()) |
---|
852 | return g.get_pointer() == fp; |
---|
853 | else return false; |
---|
854 | } |
---|
855 | |
---|
856 | template<typename Functor> |
---|
857 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
858 | operator!=(const function_base& f, reference_wrapper<Functor> g) |
---|
859 | { |
---|
860 | if (const Functor* fp = f.template target<Functor>()) |
---|
861 | return fp != g.get_pointer(); |
---|
862 | else return true; |
---|
863 | } |
---|
864 | |
---|
865 | template<typename Functor> |
---|
866 | BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL(Functor, bool) |
---|
867 | operator!=(reference_wrapper<Functor> g, const function_base& f) |
---|
868 | { |
---|
869 | if (const Functor* fp = f.template target<Functor>()) |
---|
870 | return g.get_pointer() != fp; |
---|
871 | else return true; |
---|
872 | } |
---|
873 | |
---|
874 | #endif // Compiler supporting SFINAE |
---|
875 | |
---|
876 | namespace detail { |
---|
877 | namespace function { |
---|
878 | inline bool has_empty_target(const function_base* f) |
---|
879 | { |
---|
880 | return f->empty(); |
---|
881 | } |
---|
882 | |
---|
883 | #if BOOST_WORKAROUND(BOOST_MSVC, <= 1310) |
---|
884 | inline bool has_empty_target(const void*) |
---|
885 | { |
---|
886 | return false; |
---|
887 | } |
---|
888 | #else |
---|
889 | inline bool has_empty_target(...) |
---|
890 | { |
---|
891 | return false; |
---|
892 | } |
---|
893 | #endif |
---|
894 | } // end namespace function |
---|
895 | } // end namespace detail |
---|
896 | } // end namespace boost |
---|
897 | |
---|
898 | #undef BOOST_FUNCTION_ENABLE_IF_NOT_INTEGRAL |
---|
899 | #undef BOOST_FUNCTION_COMPARE_TYPE_ID |
---|
900 | |
---|
901 | #if defined(BOOST_MSVC) |
---|
902 | # pragma warning( pop ) |
---|
903 | #endif |
---|
904 | |
---|
905 | #endif // BOOST_FUNCTION_BASE_HEADER |
---|