[29] | 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 | // Note: this header is a header template and must NOT have multiple-inclusion |
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| 11 | // protection. |
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| 12 | #include <boost/function/detail/prologue.hpp> |
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| 13 | |
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| 14 | #define BOOST_FUNCTION_TEMPLATE_PARMS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, typename T) |
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| 15 | |
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| 16 | #define BOOST_FUNCTION_TEMPLATE_ARGS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, T) |
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| 17 | |
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| 18 | #define BOOST_FUNCTION_PARM(J,I,D) BOOST_PP_CAT(T,I) BOOST_PP_CAT(a,I) |
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| 19 | |
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| 20 | #define BOOST_FUNCTION_PARMS BOOST_PP_ENUM(BOOST_FUNCTION_NUM_ARGS,BOOST_FUNCTION_PARM,BOOST_PP_EMPTY) |
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| 21 | |
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| 22 | #define BOOST_FUNCTION_ARGS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, a) |
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| 23 | |
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| 24 | #define BOOST_FUNCTION_ARG_TYPE(J,I,D) \ |
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| 25 | typedef BOOST_PP_CAT(T,I) BOOST_PP_CAT(BOOST_PP_CAT(arg, BOOST_PP_INC(I)),_type); |
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| 26 | |
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| 27 | #define BOOST_FUNCTION_ARG_TYPES BOOST_PP_REPEAT(BOOST_FUNCTION_NUM_ARGS,BOOST_FUNCTION_ARG_TYPE,BOOST_PP_EMPTY) |
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| 28 | |
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| 29 | // Type of the default allocator |
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| 30 | #ifndef BOOST_NO_STD_ALLOCATOR |
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| 31 | # define BOOST_FUNCTION_DEFAULT_ALLOCATOR std::allocator<function_base> |
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| 32 | #else |
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| 33 | # define BOOST_FUNCTION_DEFAULT_ALLOCATOR int |
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| 34 | #endif // BOOST_NO_STD_ALLOCATOR |
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| 35 | |
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| 36 | // Comma if nonzero number of arguments |
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| 37 | #if BOOST_FUNCTION_NUM_ARGS == 0 |
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| 38 | # define BOOST_FUNCTION_COMMA |
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| 39 | #else |
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| 40 | # define BOOST_FUNCTION_COMMA , |
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| 41 | #endif // BOOST_FUNCTION_NUM_ARGS > 0 |
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| 42 | |
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| 43 | // Class names used in this version of the code |
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| 44 | #define BOOST_FUNCTION_FUNCTION BOOST_JOIN(function,BOOST_FUNCTION_NUM_ARGS) |
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| 45 | #define BOOST_FUNCTION_FUNCTION_INVOKER \ |
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| 46 | BOOST_JOIN(function_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 47 | #define BOOST_FUNCTION_VOID_FUNCTION_INVOKER \ |
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| 48 | BOOST_JOIN(void_function_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 49 | #define BOOST_FUNCTION_FUNCTION_OBJ_INVOKER \ |
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| 50 | BOOST_JOIN(function_obj_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 51 | #define BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER \ |
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| 52 | BOOST_JOIN(void_function_obj_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 53 | #define BOOST_FUNCTION_FUNCTION_REF_INVOKER \ |
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| 54 | BOOST_JOIN(function_ref_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 55 | #define BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER \ |
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| 56 | BOOST_JOIN(void_function_ref_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 57 | #define BOOST_FUNCTION_GET_FUNCTION_INVOKER \ |
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| 58 | BOOST_JOIN(get_function_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 59 | #define BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER \ |
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| 60 | BOOST_JOIN(get_function_obj_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 61 | #define BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER \ |
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| 62 | BOOST_JOIN(get_function_ref_invoker,BOOST_FUNCTION_NUM_ARGS) |
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| 63 | #define BOOST_FUNCTION_VTABLE BOOST_JOIN(basic_vtable,BOOST_FUNCTION_NUM_ARGS) |
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| 64 | |
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| 65 | #ifndef BOOST_NO_VOID_RETURNS |
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| 66 | # define BOOST_FUNCTION_VOID_RETURN_TYPE void |
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| 67 | # define BOOST_FUNCTION_RETURN(X) X |
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| 68 | #else |
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| 69 | # define BOOST_FUNCTION_VOID_RETURN_TYPE boost::detail::function::unusable |
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| 70 | # define BOOST_FUNCTION_RETURN(X) X; return BOOST_FUNCTION_VOID_RETURN_TYPE () |
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| 71 | #endif |
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| 72 | |
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| 73 | #ifdef BOOST_MSVC |
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| 74 | # pragma warning(push) |
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| 75 | # pragma warning(disable: 4127) // conditional expression is constant. |
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| 76 | #endif |
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| 77 | |
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| 78 | #ifdef BOOST_MSVC |
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| 79 | # pragma warning(push) |
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| 80 | # pragma warning(disable: 4127) // conditional expression is constant. |
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| 81 | #endif |
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| 82 | |
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| 83 | namespace boost { |
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| 84 | namespace detail { |
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| 85 | namespace function { |
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| 86 | template< |
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| 87 | typename FunctionPtr, |
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| 88 | typename R BOOST_FUNCTION_COMMA |
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| 89 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 90 | > |
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| 91 | struct BOOST_FUNCTION_FUNCTION_INVOKER |
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| 92 | { |
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| 93 | static R invoke(function_buffer& function_ptr BOOST_FUNCTION_COMMA |
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| 94 | BOOST_FUNCTION_PARMS) |
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| 95 | { |
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| 96 | FunctionPtr f = reinterpret_cast<FunctionPtr>(function_ptr.func_ptr); |
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| 97 | return f(BOOST_FUNCTION_ARGS); |
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| 98 | } |
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| 99 | }; |
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| 100 | |
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| 101 | template< |
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| 102 | typename FunctionPtr, |
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| 103 | typename R BOOST_FUNCTION_COMMA |
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| 104 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 105 | > |
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| 106 | struct BOOST_FUNCTION_VOID_FUNCTION_INVOKER |
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| 107 | { |
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| 108 | static BOOST_FUNCTION_VOID_RETURN_TYPE |
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| 109 | invoke(function_buffer& function_ptr BOOST_FUNCTION_COMMA |
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| 110 | BOOST_FUNCTION_PARMS) |
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| 111 | |
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| 112 | { |
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| 113 | FunctionPtr f = reinterpret_cast<FunctionPtr>(function_ptr.func_ptr); |
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| 114 | BOOST_FUNCTION_RETURN(f(BOOST_FUNCTION_ARGS)); |
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| 115 | } |
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| 116 | }; |
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| 117 | |
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| 118 | template< |
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| 119 | typename FunctionObj, |
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| 120 | typename R BOOST_FUNCTION_COMMA |
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| 121 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 122 | > |
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| 123 | struct BOOST_FUNCTION_FUNCTION_OBJ_INVOKER |
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| 124 | { |
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| 125 | static R invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA |
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| 126 | BOOST_FUNCTION_PARMS) |
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| 127 | |
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| 128 | { |
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| 129 | FunctionObj* f; |
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| 130 | if (function_allows_small_object_optimization<FunctionObj>::value) |
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| 131 | f = reinterpret_cast<FunctionObj*>(&function_obj_ptr.data); |
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| 132 | else |
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| 133 | f = reinterpret_cast<FunctionObj*>(function_obj_ptr.obj_ptr); |
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| 134 | return (*f)(BOOST_FUNCTION_ARGS); |
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| 135 | } |
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| 136 | }; |
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| 137 | |
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| 138 | template< |
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| 139 | typename FunctionObj, |
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| 140 | typename R BOOST_FUNCTION_COMMA |
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| 141 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 142 | > |
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| 143 | struct BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER |
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| 144 | { |
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| 145 | static BOOST_FUNCTION_VOID_RETURN_TYPE |
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| 146 | invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA |
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| 147 | BOOST_FUNCTION_PARMS) |
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| 148 | |
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| 149 | { |
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| 150 | FunctionObj* f; |
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| 151 | if (function_allows_small_object_optimization<FunctionObj>::value) |
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| 152 | f = reinterpret_cast<FunctionObj*>(&function_obj_ptr.data); |
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| 153 | else |
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| 154 | f = reinterpret_cast<FunctionObj*>(function_obj_ptr.obj_ptr); |
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| 155 | BOOST_FUNCTION_RETURN((*f)(BOOST_FUNCTION_ARGS)); |
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| 156 | } |
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| 157 | }; |
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| 158 | |
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| 159 | template< |
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| 160 | typename FunctionObj, |
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| 161 | typename R BOOST_FUNCTION_COMMA |
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| 162 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 163 | > |
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| 164 | struct BOOST_FUNCTION_FUNCTION_REF_INVOKER |
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| 165 | { |
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| 166 | static R invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA |
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| 167 | BOOST_FUNCTION_PARMS) |
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| 168 | |
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| 169 | { |
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| 170 | FunctionObj* f = |
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| 171 | reinterpret_cast<FunctionObj*>(function_obj_ptr.obj_ptr); |
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| 172 | return (*f)(BOOST_FUNCTION_ARGS); |
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| 173 | } |
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| 174 | }; |
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| 175 | |
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| 176 | template< |
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| 177 | typename FunctionObj, |
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| 178 | typename R BOOST_FUNCTION_COMMA |
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| 179 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 180 | > |
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| 181 | struct BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER |
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| 182 | { |
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| 183 | static BOOST_FUNCTION_VOID_RETURN_TYPE |
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| 184 | invoke(function_buffer& function_obj_ptr BOOST_FUNCTION_COMMA |
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| 185 | BOOST_FUNCTION_PARMS) |
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| 186 | |
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| 187 | { |
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| 188 | FunctionObj* f = |
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| 189 | reinterpret_cast<FunctionObj*>(function_obj_ptr.obj_ptr); |
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| 190 | BOOST_FUNCTION_RETURN((*f)(BOOST_FUNCTION_ARGS)); |
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| 191 | } |
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| 192 | }; |
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| 193 | |
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| 194 | template< |
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| 195 | typename FunctionPtr, |
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| 196 | typename R BOOST_FUNCTION_COMMA |
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| 197 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 198 | > |
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| 199 | struct BOOST_FUNCTION_GET_FUNCTION_INVOKER |
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| 200 | { |
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| 201 | typedef typename mpl::if_c<(is_void<R>::value), |
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| 202 | BOOST_FUNCTION_VOID_FUNCTION_INVOKER< |
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| 203 | FunctionPtr, |
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| 204 | R BOOST_FUNCTION_COMMA |
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| 205 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 206 | >, |
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| 207 | BOOST_FUNCTION_FUNCTION_INVOKER< |
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| 208 | FunctionPtr, |
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| 209 | R BOOST_FUNCTION_COMMA |
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| 210 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 211 | > |
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| 212 | >::type type; |
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| 213 | }; |
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| 214 | |
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| 215 | template< |
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| 216 | typename FunctionObj, |
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| 217 | typename R BOOST_FUNCTION_COMMA |
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| 218 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 219 | > |
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| 220 | struct BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER |
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| 221 | { |
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| 222 | typedef typename mpl::if_c<(is_void<R>::value), |
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| 223 | BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER< |
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| 224 | FunctionObj, |
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| 225 | R BOOST_FUNCTION_COMMA |
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| 226 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 227 | >, |
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| 228 | BOOST_FUNCTION_FUNCTION_OBJ_INVOKER< |
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| 229 | FunctionObj, |
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| 230 | R BOOST_FUNCTION_COMMA |
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| 231 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 232 | > |
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| 233 | >::type type; |
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| 234 | }; |
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| 235 | |
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| 236 | template< |
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| 237 | typename FunctionObj, |
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| 238 | typename R BOOST_FUNCTION_COMMA |
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| 239 | BOOST_FUNCTION_TEMPLATE_PARMS |
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| 240 | > |
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| 241 | struct BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER |
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| 242 | { |
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| 243 | typedef typename mpl::if_c<(is_void<R>::value), |
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| 244 | BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER< |
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| 245 | FunctionObj, |
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| 246 | R BOOST_FUNCTION_COMMA |
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| 247 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 248 | >, |
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| 249 | BOOST_FUNCTION_FUNCTION_REF_INVOKER< |
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| 250 | FunctionObj, |
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| 251 | R BOOST_FUNCTION_COMMA |
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| 252 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 253 | > |
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| 254 | >::type type; |
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| 255 | }; |
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| 256 | |
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| 257 | /** |
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| 258 | * vtable for a specific boost::function instance. |
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| 259 | */ |
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| 260 | template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS, |
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| 261 | typename Allocator> |
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| 262 | struct BOOST_FUNCTION_VTABLE : vtable_base |
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| 263 | { |
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| 264 | #ifndef BOOST_NO_VOID_RETURNS |
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| 265 | typedef R result_type; |
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| 266 | #else |
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| 267 | typedef typename function_return_type<R>::type result_type; |
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| 268 | #endif // BOOST_NO_VOID_RETURNS |
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| 269 | |
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| 270 | typedef result_type (*invoker_type)(function_buffer& |
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| 271 | BOOST_FUNCTION_COMMA |
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| 272 | BOOST_FUNCTION_TEMPLATE_ARGS); |
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| 273 | |
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| 274 | template<typename F> |
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| 275 | BOOST_FUNCTION_VTABLE(F f) : vtable_base(), invoker(0) |
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| 276 | { |
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| 277 | init(f); |
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| 278 | } |
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| 279 | |
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| 280 | template<typename F> |
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| 281 | bool assign_to(F f, function_buffer& functor) |
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| 282 | { |
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| 283 | typedef typename get_function_tag<F>::type tag; |
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| 284 | return assign_to(f, functor, tag()); |
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| 285 | } |
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| 286 | |
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| 287 | void clear(function_buffer& functor) |
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| 288 | { |
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| 289 | if (manager) |
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| 290 | manager(functor, functor, destroy_functor_tag); |
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| 291 | } |
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| 292 | |
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| 293 | private: |
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| 294 | template<typename F> |
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| 295 | void init(F f) |
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| 296 | { |
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| 297 | typedef typename get_function_tag<F>::type tag; |
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| 298 | init(f, tag()); |
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| 299 | } |
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| 300 | |
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| 301 | // Function pointers |
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| 302 | template<typename FunctionPtr> |
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| 303 | void init(FunctionPtr /*f*/, function_ptr_tag) |
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| 304 | { |
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| 305 | typedef typename BOOST_FUNCTION_GET_FUNCTION_INVOKER< |
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| 306 | FunctionPtr, |
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| 307 | R BOOST_FUNCTION_COMMA |
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| 308 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 309 | >::type |
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| 310 | actual_invoker_type; |
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| 311 | |
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| 312 | invoker = &actual_invoker_type::invoke; |
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| 313 | manager = &functor_manager<FunctionPtr, Allocator>::manage; |
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| 314 | } |
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| 315 | |
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| 316 | template<typename FunctionPtr> |
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| 317 | bool |
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| 318 | assign_to(FunctionPtr f, function_buffer& functor, function_ptr_tag) |
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| 319 | { |
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| 320 | this->clear(functor); |
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| 321 | if (f) { |
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| 322 | // should be a reinterpret cast, but some compilers insist |
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| 323 | // on giving cv-qualifiers to free functions |
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| 324 | functor.func_ptr = (void (*)())(f); |
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| 325 | return true; |
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| 326 | } else { |
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| 327 | return false; |
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| 328 | } |
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| 329 | } |
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| 330 | |
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| 331 | // Member pointers |
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| 332 | #if BOOST_FUNCTION_NUM_ARGS > 0 |
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| 333 | template<typename MemberPtr> |
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| 334 | void init(MemberPtr f, member_ptr_tag) |
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| 335 | { |
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| 336 | // DPG TBD: Add explicit support for member function |
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| 337 | // objects, so we invoke through mem_fn() but we retain the |
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| 338 | // right target_type() values. |
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| 339 | this->init(mem_fn(f)); |
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| 340 | } |
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| 341 | |
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| 342 | template<typename MemberPtr> |
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| 343 | bool assign_to(MemberPtr f, function_buffer& functor, member_ptr_tag) |
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| 344 | { |
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| 345 | // DPG TBD: Add explicit support for member function |
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| 346 | // objects, so we invoke through mem_fn() but we retain the |
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| 347 | // right target_type() values. |
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| 348 | if (f) { |
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| 349 | this->assign_to(mem_fn(f), functor); |
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| 350 | return true; |
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| 351 | } else { |
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| 352 | return false; |
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| 353 | } |
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| 354 | } |
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| 355 | #endif // BOOST_FUNCTION_NUM_ARGS > 0 |
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| 356 | |
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| 357 | // Function objects |
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| 358 | template<typename FunctionObj> |
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| 359 | void init(FunctionObj /*f*/, function_obj_tag) |
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| 360 | { |
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| 361 | typedef typename BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER< |
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| 362 | FunctionObj, |
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| 363 | R BOOST_FUNCTION_COMMA |
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| 364 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 365 | >::type |
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| 366 | actual_invoker_type; |
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| 367 | |
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| 368 | invoker = &actual_invoker_type::invoke; |
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| 369 | manager = &functor_manager<FunctionObj, Allocator>::manage; |
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| 370 | } |
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| 371 | |
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| 372 | // Assign to a function object using the small object optimization |
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| 373 | template<typename FunctionObj> |
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| 374 | void |
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| 375 | assign_functor(FunctionObj f, function_buffer& functor, mpl::true_) |
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| 376 | { |
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| 377 | new ((void*)&functor.data) FunctionObj(f); |
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| 378 | } |
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| 379 | |
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| 380 | // Assign to a function object allocated on the heap. |
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| 381 | template<typename FunctionObj> |
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| 382 | void |
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| 383 | assign_functor(FunctionObj f, function_buffer& functor, mpl::false_) |
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| 384 | { |
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| 385 | #ifndef BOOST_NO_STD_ALLOCATOR |
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| 386 | typedef typename Allocator::template rebind<FunctionObj>::other |
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| 387 | allocator_type; |
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| 388 | typedef typename allocator_type::pointer pointer_type; |
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| 389 | |
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| 390 | allocator_type allocator; |
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| 391 | pointer_type copy = allocator.allocate(1); |
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| 392 | allocator.construct(copy, f); |
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| 393 | |
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| 394 | // Get back to the original pointer type |
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| 395 | functor.obj_ptr = static_cast<FunctionObj*>(copy); |
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| 396 | # else |
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| 397 | functor.obj_ptr = new FunctionObj(f); |
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| 398 | # endif // BOOST_NO_STD_ALLOCATOR |
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| 399 | } |
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| 400 | |
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| 401 | template<typename FunctionObj> |
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| 402 | bool |
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| 403 | assign_to(FunctionObj f, function_buffer& functor, function_obj_tag) |
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| 404 | { |
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| 405 | if (!boost::detail::function::has_empty_target(boost::addressof(f))) { |
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| 406 | assign_functor(f, functor, |
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| 407 | mpl::bool_<(function_allows_small_object_optimization<FunctionObj>::value)>()); |
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| 408 | return true; |
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| 409 | } else { |
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| 410 | return false; |
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| 411 | } |
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| 412 | } |
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| 413 | |
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| 414 | // Reference to a function object |
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| 415 | template<typename FunctionObj> |
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| 416 | void |
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| 417 | init(const reference_wrapper<FunctionObj>& /*f*/, function_obj_ref_tag) |
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| 418 | { |
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| 419 | typedef typename BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER< |
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| 420 | FunctionObj, |
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| 421 | R BOOST_FUNCTION_COMMA |
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| 422 | BOOST_FUNCTION_TEMPLATE_ARGS |
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| 423 | >::type |
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| 424 | actual_invoker_type; |
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| 425 | |
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| 426 | invoker = &actual_invoker_type::invoke; |
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| 427 | manager = &reference_manager<FunctionObj>::get; |
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| 428 | } |
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| 429 | |
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| 430 | template<typename FunctionObj> |
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| 431 | bool |
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| 432 | assign_to(const reference_wrapper<FunctionObj>& f, |
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| 433 | function_buffer& functor, function_obj_ref_tag) |
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| 434 | { |
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| 435 | if (!boost::detail::function::has_empty_target(f.get_pointer())) { |
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| 436 | // DPG TBD: We might need to detect constness of |
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| 437 | // FunctionObj to assign into obj_ptr or const_obj_ptr to |
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| 438 | // be truly legit, but no platform in existence makes |
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| 439 | // const void* different from void*. |
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| 440 | functor.const_obj_ptr = f.get_pointer(); |
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| 441 | return true; |
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| 442 | } else { |
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| 443 | return false; |
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| 444 | } |
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| 445 | } |
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| 446 | |
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| 447 | public: |
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| 448 | invoker_type invoker; |
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| 449 | }; |
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| 450 | } // end namespace function |
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| 451 | } // end namespace detail |
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| 452 | |
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| 453 | template< |
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| 454 | typename R BOOST_FUNCTION_COMMA |
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| 455 | BOOST_FUNCTION_TEMPLATE_PARMS, |
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| 456 | typename Allocator = BOOST_FUNCTION_DEFAULT_ALLOCATOR |
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| 457 | > |
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| 458 | class BOOST_FUNCTION_FUNCTION : public function_base |
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| 459 | { |
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| 460 | public: |
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| 461 | #ifndef BOOST_NO_VOID_RETURNS |
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| 462 | typedef R result_type; |
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| 463 | #else |
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| 464 | typedef typename boost::detail::function::function_return_type<R>::type |
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| 465 | result_type; |
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| 466 | #endif // BOOST_NO_VOID_RETURNS |
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| 467 | |
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| 468 | private: |
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| 469 | typedef boost::detail::function::BOOST_FUNCTION_VTABLE< |
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| 470 | R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS, Allocator> |
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| 471 | vtable_type; |
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| 472 | |
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| 473 | struct clear_type {}; |
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| 474 | |
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| 475 | public: |
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| 476 | BOOST_STATIC_CONSTANT(int, args = BOOST_FUNCTION_NUM_ARGS); |
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| 477 | |
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| 478 | // add signature for boost::lambda |
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| 479 | template<typename Args> |
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| 480 | struct sig |
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| 481 | { |
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| 482 | typedef result_type type; |
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| 483 | }; |
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| 484 | |
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| 485 | #if BOOST_FUNCTION_NUM_ARGS == 1 |
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| 486 | typedef T0 argument_type; |
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| 487 | #elif BOOST_FUNCTION_NUM_ARGS == 2 |
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| 488 | typedef T0 first_argument_type; |
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| 489 | typedef T1 second_argument_type; |
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| 490 | #endif |
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| 491 | |
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| 492 | BOOST_STATIC_CONSTANT(int, arity = BOOST_FUNCTION_NUM_ARGS); |
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| 493 | BOOST_FUNCTION_ARG_TYPES |
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| 494 | |
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| 495 | typedef Allocator allocator_type; |
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| 496 | typedef BOOST_FUNCTION_FUNCTION self_type; |
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| 497 | |
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| 498 | BOOST_FUNCTION_FUNCTION() : function_base() { } |
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| 499 | |
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| 500 | // MSVC chokes if the following two constructors are collapsed into |
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| 501 | // one with a default parameter. |
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| 502 | template<typename Functor> |
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| 503 | BOOST_FUNCTION_FUNCTION(Functor BOOST_FUNCTION_TARGET_FIX(const &) f |
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| 504 | #ifndef BOOST_NO_SFINAE |
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| 505 | ,typename enable_if_c< |
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| 506 | (boost::type_traits::ice_not< |
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| 507 | (is_integral<Functor>::value)>::value), |
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| 508 | int>::type = 0 |
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| 509 | #endif // BOOST_NO_SFINAE |
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| 510 | ) : |
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| 511 | function_base() |
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| 512 | { |
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| 513 | this->assign_to(f); |
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| 514 | } |
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| 515 | |
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| 516 | #ifndef BOOST_NO_SFINAE |
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| 517 | BOOST_FUNCTION_FUNCTION(clear_type*) : function_base() { } |
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| 518 | #else |
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| 519 | BOOST_FUNCTION_FUNCTION(int zero) : function_base() |
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| 520 | { |
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| 521 | BOOST_ASSERT(zero == 0); |
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| 522 | } |
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| 523 | #endif |
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| 524 | |
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| 525 | BOOST_FUNCTION_FUNCTION(const BOOST_FUNCTION_FUNCTION& f) : function_base() |
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| 526 | { |
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| 527 | this->assign_to_own(f); |
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| 528 | } |
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| 529 | |
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| 530 | ~BOOST_FUNCTION_FUNCTION() { clear(); } |
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| 531 | |
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| 532 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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| 533 | // MSVC 6.0 and prior require all definitions to be inline, but |
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| 534 | // these definitions can become very costly. |
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| 535 | result_type operator()(BOOST_FUNCTION_PARMS) const |
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| 536 | { |
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| 537 | if (this->empty()) |
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| 538 | boost::throw_exception(bad_function_call()); |
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| 539 | |
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| 540 | return static_cast<vtable_type*>(vtable)->invoker |
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| 541 | (this->functor BOOST_FUNCTION_COMMA BOOST_FUNCTION_ARGS); |
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| 542 | } |
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| 543 | #else |
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| 544 | result_type operator()(BOOST_FUNCTION_PARMS) const; |
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| 545 | #endif |
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| 546 | |
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| 547 | // The distinction between when to use BOOST_FUNCTION_FUNCTION and |
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| 548 | // when to use self_type is obnoxious. MSVC cannot handle self_type as |
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| 549 | // the return type of these assignment operators, but Borland C++ cannot |
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| 550 | // handle BOOST_FUNCTION_FUNCTION as the type of the temporary to |
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| 551 | // construct. |
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| 552 | template<typename Functor> |
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| 553 | #ifndef BOOST_NO_SFINAE |
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| 554 | typename enable_if_c< |
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| 555 | (boost::type_traits::ice_not< |
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| 556 | (is_integral<Functor>::value)>::value), |
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| 557 | BOOST_FUNCTION_FUNCTION&>::type |
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| 558 | #else |
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| 559 | BOOST_FUNCTION_FUNCTION& |
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| 560 | #endif |
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| 561 | operator=(Functor BOOST_FUNCTION_TARGET_FIX(const &) f) |
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| 562 | { |
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| 563 | this->clear(); |
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| 564 | try { |
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| 565 | this->assign_to(f); |
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| 566 | } catch (...) { |
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| 567 | vtable = 0; |
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| 568 | throw; |
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| 569 | } |
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| 570 | return *this; |
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| 571 | } |
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| 572 | |
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| 573 | #ifndef BOOST_NO_SFINAE |
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| 574 | BOOST_FUNCTION_FUNCTION& operator=(clear_type*) |
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| 575 | { |
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| 576 | this->clear(); |
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| 577 | return *this; |
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| 578 | } |
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| 579 | #else |
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| 580 | BOOST_FUNCTION_FUNCTION& operator=(int zero) |
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| 581 | { |
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| 582 | BOOST_ASSERT(zero == 0); |
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| 583 | this->clear(); |
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| 584 | return *this; |
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| 585 | } |
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| 586 | #endif |
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| 587 | |
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| 588 | // Assignment from another BOOST_FUNCTION_FUNCTION |
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| 589 | BOOST_FUNCTION_FUNCTION& operator=(const BOOST_FUNCTION_FUNCTION& f) |
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| 590 | { |
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| 591 | if (&f == this) |
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| 592 | return *this; |
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| 593 | |
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| 594 | this->clear(); |
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| 595 | try { |
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| 596 | this->assign_to_own(f); |
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| 597 | } catch (...) { |
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| 598 | vtable = 0; |
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| 599 | throw; |
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| 600 | } |
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| 601 | return *this; |
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| 602 | } |
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| 603 | |
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| 604 | void swap(BOOST_FUNCTION_FUNCTION& other) |
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| 605 | { |
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| 606 | if (&other == this) |
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| 607 | return; |
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| 608 | |
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| 609 | BOOST_FUNCTION_FUNCTION tmp = *this; |
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| 610 | *this = other; |
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| 611 | other = tmp; |
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| 612 | } |
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| 613 | |
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| 614 | // Clear out a target, if there is one |
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| 615 | void clear() |
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| 616 | { |
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| 617 | if (vtable) { |
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| 618 | static_cast<vtable_type*>(vtable)->clear(this->functor); |
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| 619 | vtable = 0; |
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| 620 | } |
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| 621 | } |
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| 622 | |
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| 623 | #if (defined __SUNPRO_CC) && (__SUNPRO_CC <= 0x530) && !(defined BOOST_NO_COMPILER_CONFIG) |
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| 624 | // Sun C++ 5.3 can't handle the safe_bool idiom, so don't use it |
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| 625 | operator bool () const { return !this->empty(); } |
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| 626 | #else |
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| 627 | private: |
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| 628 | struct dummy { |
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| 629 | void nonnull() {}; |
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| 630 | }; |
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| 631 | |
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| 632 | typedef void (dummy::*safe_bool)(); |
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| 633 | |
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| 634 | public: |
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| 635 | operator safe_bool () const |
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| 636 | { return (this->empty())? 0 : &dummy::nonnull; } |
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| 637 | |
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| 638 | bool operator!() const |
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| 639 | { return this->empty(); } |
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| 640 | #endif |
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| 641 | |
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| 642 | private: |
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| 643 | void assign_to_own(const BOOST_FUNCTION_FUNCTION& f) |
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| 644 | { |
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| 645 | if (!f.empty()) { |
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| 646 | this->vtable = f.vtable; |
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| 647 | f.vtable->manager(f.functor, this->functor, |
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| 648 | boost::detail::function::clone_functor_tag); |
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| 649 | } |
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| 650 | } |
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| 651 | |
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| 652 | template<typename Functor> |
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| 653 | void assign_to(Functor f) |
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| 654 | { |
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| 655 | static vtable_type stored_vtable(f); |
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| 656 | if (stored_vtable.assign_to(f, functor)) vtable = &stored_vtable; |
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| 657 | else vtable = 0; |
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| 658 | } |
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| 659 | }; |
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| 660 | |
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| 661 | template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS , |
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| 662 | typename Allocator> |
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| 663 | inline void swap(BOOST_FUNCTION_FUNCTION< |
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| 664 | R BOOST_FUNCTION_COMMA |
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| 665 | BOOST_FUNCTION_TEMPLATE_ARGS , |
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| 666 | Allocator |
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| 667 | >& f1, |
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| 668 | BOOST_FUNCTION_FUNCTION< |
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| 669 | R BOOST_FUNCTION_COMMA |
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| 670 | BOOST_FUNCTION_TEMPLATE_ARGS, |
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| 671 | Allocator |
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| 672 | >& f2) |
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| 673 | { |
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| 674 | f1.swap(f2); |
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| 675 | } |
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| 676 | |
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| 677 | #if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) |
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| 678 | template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS, |
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| 679 | typename Allocator> |
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| 680 | typename BOOST_FUNCTION_FUNCTION< |
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| 681 | R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS, |
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| 682 | Allocator>::result_type |
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| 683 | BOOST_FUNCTION_FUNCTION<R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_ARGS, |
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| 684 | |
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| 685 | Allocator> |
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| 686 | ::operator()(BOOST_FUNCTION_PARMS) const |
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| 687 | { |
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| 688 | if (this->empty()) |
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| 689 | boost::throw_exception(bad_function_call()); |
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| 690 | |
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| 691 | return static_cast<vtable_type*>(vtable)->invoker |
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| 692 | (this->functor BOOST_FUNCTION_COMMA BOOST_FUNCTION_ARGS); |
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| 693 | } |
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| 694 | #endif |
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| 695 | |
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| 696 | // Poison comparisons between boost::function objects of the same type. |
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| 697 | template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS , |
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| 698 | typename Allocator> |
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| 699 | void operator==(const BOOST_FUNCTION_FUNCTION< |
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| 700 | R BOOST_FUNCTION_COMMA |
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| 701 | BOOST_FUNCTION_TEMPLATE_ARGS , |
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| 702 | Allocator>&, |
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| 703 | const BOOST_FUNCTION_FUNCTION< |
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| 704 | R BOOST_FUNCTION_COMMA |
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| 705 | BOOST_FUNCTION_TEMPLATE_ARGS , |
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| 706 | Allocator>&); |
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| 707 | template<typename R BOOST_FUNCTION_COMMA BOOST_FUNCTION_TEMPLATE_PARMS , |
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| 708 | typename Allocator> |
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| 709 | void operator!=(const BOOST_FUNCTION_FUNCTION< |
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| 710 | R BOOST_FUNCTION_COMMA |
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| 711 | BOOST_FUNCTION_TEMPLATE_ARGS , |
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| 712 | Allocator>&, |
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| 713 | const BOOST_FUNCTION_FUNCTION< |
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| 714 | R BOOST_FUNCTION_COMMA |
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| 715 | BOOST_FUNCTION_TEMPLATE_ARGS , |
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| 716 | Allocator>&); |
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| 717 | |
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| 718 | #if !defined(BOOST_FUNCTION_NO_FUNCTION_TYPE_SYNTAX) |
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| 719 | |
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| 720 | #if BOOST_FUNCTION_NUM_ARGS == 0 |
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| 721 | #define BOOST_FUNCTION_PARTIAL_SPEC R (void) |
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| 722 | #else |
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| 723 | #define BOOST_FUNCTION_PARTIAL_SPEC R (BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS,T)) |
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| 724 | #endif |
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| 725 | |
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| 726 | template<typename R BOOST_FUNCTION_COMMA |
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| 727 | BOOST_FUNCTION_TEMPLATE_PARMS, |
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| 728 | typename Allocator> |
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| 729 | class function<BOOST_FUNCTION_PARTIAL_SPEC, Allocator> |
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| 730 | : public BOOST_FUNCTION_FUNCTION<R, BOOST_FUNCTION_TEMPLATE_ARGS |
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| 731 | BOOST_FUNCTION_COMMA Allocator> |
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| 732 | { |
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| 733 | typedef BOOST_FUNCTION_FUNCTION<R, BOOST_FUNCTION_TEMPLATE_ARGS |
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| 734 | BOOST_FUNCTION_COMMA Allocator> base_type; |
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| 735 | typedef function self_type; |
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| 736 | |
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| 737 | struct clear_type {}; |
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| 738 | |
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| 739 | public: |
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| 740 | typedef typename base_type::allocator_type allocator_type; |
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| 741 | |
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| 742 | function() : base_type() {} |
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| 743 | |
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| 744 | template<typename Functor> |
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| 745 | function(Functor f |
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| 746 | #ifndef BOOST_NO_SFINAE |
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| 747 | ,typename enable_if_c< |
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| 748 | (boost::type_traits::ice_not< |
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| 749 | (is_integral<Functor>::value)>::value), |
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| 750 | int>::type = 0 |
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| 751 | #endif |
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| 752 | ) : |
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| 753 | base_type(f) |
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| 754 | { |
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| 755 | } |
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| 756 | |
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| 757 | #ifndef BOOST_NO_SFINAE |
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| 758 | function(clear_type*) : base_type() {} |
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| 759 | #endif |
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| 760 | |
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| 761 | function(const self_type& f) : base_type(static_cast<const base_type&>(f)){} |
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| 762 | |
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| 763 | function(const base_type& f) : base_type(static_cast<const base_type&>(f)){} |
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| 764 | |
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| 765 | self_type& operator=(const self_type& f) |
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| 766 | { |
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| 767 | self_type(f).swap(*this); |
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| 768 | return *this; |
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| 769 | } |
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| 770 | |
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| 771 | template<typename Functor> |
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| 772 | #ifndef BOOST_NO_SFINAE |
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| 773 | typename enable_if_c< |
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| 774 | (boost::type_traits::ice_not< |
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| 775 | (is_integral<Functor>::value)>::value), |
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| 776 | self_type&>::type |
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| 777 | #else |
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| 778 | self_type& |
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| 779 | #endif |
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| 780 | operator=(Functor f) |
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| 781 | { |
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| 782 | self_type(f).swap(*this); |
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| 783 | return *this; |
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| 784 | } |
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| 785 | |
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| 786 | #ifndef BOOST_NO_SFINAE |
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| 787 | self_type& operator=(clear_type*) |
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| 788 | { |
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| 789 | this->clear(); |
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| 790 | return *this; |
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| 791 | } |
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| 792 | #endif |
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| 793 | |
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| 794 | self_type& operator=(const base_type& f) |
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| 795 | { |
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| 796 | self_type(f).swap(*this); |
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| 797 | return *this; |
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| 798 | } |
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| 799 | }; |
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| 800 | |
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| 801 | #ifdef BOOST_MSVC |
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| 802 | # pragma warning(pop) |
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| 803 | #endif |
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| 804 | |
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| 805 | #undef BOOST_FUNCTION_PARTIAL_SPEC |
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| 806 | #endif // have partial specialization |
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| 807 | |
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| 808 | } // end namespace boost |
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| 809 | |
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| 810 | #ifdef BOOST_MSVC |
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| 811 | # pragma warning(pop) |
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| 812 | #endif |
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| 813 | |
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| 814 | // Cleanup after ourselves... |
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| 815 | #undef BOOST_FUNCTION_VTABLE |
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| 816 | #undef BOOST_FUNCTION_DEFAULT_ALLOCATOR |
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| 817 | #undef BOOST_FUNCTION_COMMA |
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| 818 | #undef BOOST_FUNCTION_FUNCTION |
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| 819 | #undef BOOST_FUNCTION_FUNCTION_INVOKER |
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| 820 | #undef BOOST_FUNCTION_VOID_FUNCTION_INVOKER |
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| 821 | #undef BOOST_FUNCTION_FUNCTION_OBJ_INVOKER |
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| 822 | #undef BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER |
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| 823 | #undef BOOST_FUNCTION_FUNCTION_REF_INVOKER |
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| 824 | #undef BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER |
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| 825 | #undef BOOST_FUNCTION_GET_FUNCTION_INVOKER |
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| 826 | #undef BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER |
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| 827 | #undef BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER |
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| 828 | #undef BOOST_FUNCTION_GET_MEM_FUNCTION_INVOKER |
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| 829 | #undef BOOST_FUNCTION_TEMPLATE_PARMS |
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| 830 | #undef BOOST_FUNCTION_TEMPLATE_ARGS |
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| 831 | #undef BOOST_FUNCTION_PARMS |
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| 832 | #undef BOOST_FUNCTION_PARM |
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| 833 | #undef BOOST_FUNCTION_ARGS |
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| 834 | #undef BOOST_FUNCTION_ARG_TYPE |
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| 835 | #undef BOOST_FUNCTION_ARG_TYPES |
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| 836 | #undef BOOST_FUNCTION_VOID_RETURN_TYPE |
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| 837 | #undef BOOST_FUNCTION_RETURN |
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