Flexible templated function class and related utilities that avoid dynamic memory allocation without limiting functionality
FuncPtr provides a flexible templated function class and related utilities while avoiding dynamic memory allocation and avoiding limited functionality.
FuncPtr provides an intuitive template interface:
FuncPtr<void(const char *)> func(puts); func("hello!\n"); // prints hello!
Several function types are supported by FuncPtr:
// Simple C functions void func(); FuncPtr<void()> fp(func); // C++ Methods struct Thing { void func(); }; Thing thing; FuncPtr<void()> fp(&thing, &Thing::func); // C functions with context void func(Thing *); FuncPtr<void()> fp(&thing, func); // Function objects struct Thing { void operator()(); }; Thing thing; FuncPtr<void()> fp(&thing);
There is no dynamic memory allocation, managing memory is placed entirely on the user. More advanced function manipulation can be accomplished with statically allocated classes:
// Function binding Binder<void(const char *), const char *> bind(putc, "hi!"); bind(); // prints hi! // Function composition Composer<int(const char *), const char *(int)> comp(puts, itoa); comp(10); // prints 10 // Function chaining Chainer<void(const char *), 2> chain; chain.attach(puts); chain.attach(puts); chain("hi!\n"); // prints hi! twice
FuncPtr allows easy support of a large range of function types in C++ APIs with very few lines of code:
class Thing { public: // The following two methods are sufficient for supporting // every supported function type void attach(FuncPtr<void()> func) { _func.attach(func); } template<typename T, typename M> void attach(T *obj, M method) { attach(FuncPtr<void()>(obj, method)); } private: FuncPtr<void()> _func; }
Additionally, FuncPtrs have several utilities for easy integration with C APIs:
// C style callbacks void register_callback(void (*callback)(void *), void *data); register_callback(&FuncPtr<void()>::thunk, &func); // C style functions without context void register_callback(void (*callback)()); Thunker thunk(func); register_callback(thunk); // mbed style callbacks void register_callback(T *obj, void (T::*M)()); register_callback(&func, &FuncPtr<void()>::call);
FuncPtr.h@1:9c28068feddc, 2016-04-17 (annotated)
- Committer:
- Christopher Haster
- Date:
- Sun Apr 17 13:34:58 2016 -0500
- Revision:
- 1:9c28068feddc
- Parent:
- 0:176c74479de2
- Child:
- 2:56e1906f7103
Added thunk function for better interoperability with C
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Christopher Haster |
0:176c74479de2 | 1 | /** FuncPtr |
Christopher Haster |
0:176c74479de2 | 2 | * Flexible templated function class that avoids dynamic memory |
Christopher Haster |
0:176c74479de2 | 3 | * allocation without limiting functionality |
Christopher Haster |
0:176c74479de2 | 4 | */ |
Christopher Haster |
0:176c74479de2 | 5 | #ifndef FUNCPTR_H |
Christopher Haster |
0:176c74479de2 | 6 | #define FUNCPTR_H |
Christopher Haster |
0:176c74479de2 | 7 | |
Christopher Haster |
0:176c74479de2 | 8 | #include <string.h> |
Christopher Haster |
0:176c74479de2 | 9 | #include <stdint.h> |
Christopher Haster |
0:176c74479de2 | 10 | |
Christopher Haster |
0:176c74479de2 | 11 | |
Christopher Haster |
0:176c74479de2 | 12 | /** FuncPtr class based on template specialization |
Christopher Haster |
0:176c74479de2 | 13 | */ |
Christopher Haster |
0:176c74479de2 | 14 | template <typename F> |
Christopher Haster |
0:176c74479de2 | 15 | class FuncPtr; |
Christopher Haster |
0:176c74479de2 | 16 | |
Christopher Haster |
0:176c74479de2 | 17 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 18 | */ |
Christopher Haster |
0:176c74479de2 | 19 | template <typename R, typename A0, typename A1, typename A2, typename A3> |
Christopher Haster |
0:176c74479de2 | 20 | class FuncPtr<R(A0, A1, A2, A3)> { |
Christopher Haster |
0:176c74479de2 | 21 | public: |
Christopher Haster |
0:176c74479de2 | 22 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 23 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 24 | */ |
Christopher Haster |
0:176c74479de2 | 25 | FuncPtr(R (*func)(A0, A1, A2, A3) = 0) { |
Christopher Haster |
0:176c74479de2 | 26 | attach(func); |
Christopher Haster |
0:176c74479de2 | 27 | } |
Christopher Haster |
0:176c74479de2 | 28 | |
Christopher Haster |
0:176c74479de2 | 29 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 30 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 31 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 32 | */ |
Christopher Haster |
0:176c74479de2 | 33 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 34 | FuncPtr(T *obj, R (*func)(T*, A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 35 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 36 | } |
Christopher Haster |
0:176c74479de2 | 37 | |
Christopher Haster |
0:176c74479de2 | 38 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 39 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 40 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 41 | */ |
Christopher Haster |
0:176c74479de2 | 42 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 43 | FuncPtr(T *obj, R (T::*func)(A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 44 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 45 | } |
Christopher Haster |
0:176c74479de2 | 46 | |
Christopher Haster |
0:176c74479de2 | 47 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 48 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 49 | */ |
Christopher Haster |
0:176c74479de2 | 50 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 51 | FuncPtr(T *obj) { |
Christopher Haster |
0:176c74479de2 | 52 | attach(obj, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 53 | } |
Christopher Haster |
0:176c74479de2 | 54 | |
Christopher Haster |
0:176c74479de2 | 55 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 56 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 57 | */ |
Christopher Haster |
0:176c74479de2 | 58 | FuncPtr(const FuncPtr<R(A0, A1, A2, A3)> &func) { |
Christopher Haster |
0:176c74479de2 | 59 | attach(func); |
Christopher Haster |
0:176c74479de2 | 60 | } |
Christopher Haster |
0:176c74479de2 | 61 | |
Christopher Haster |
0:176c74479de2 | 62 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 63 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 64 | */ |
Christopher Haster |
0:176c74479de2 | 65 | void attach(R (*func)(A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 66 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 67 | _thunk = &FuncPtr::_staticthunk; |
Christopher Haster |
0:176c74479de2 | 68 | } |
Christopher Haster |
0:176c74479de2 | 69 | |
Christopher Haster |
0:176c74479de2 | 70 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 71 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 72 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 73 | */ |
Christopher Haster |
0:176c74479de2 | 74 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 75 | void attach(T *obj, R (*func)(T*, A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 76 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 77 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 78 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 79 | } |
Christopher Haster |
0:176c74479de2 | 80 | |
Christopher Haster |
0:176c74479de2 | 81 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 82 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 83 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 84 | */ |
Christopher Haster |
0:176c74479de2 | 85 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 86 | void attach(T *obj, R (T::*func)(A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 87 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 88 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 89 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 90 | } |
Christopher Haster |
0:176c74479de2 | 91 | |
Christopher Haster |
0:176c74479de2 | 92 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 93 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 94 | */ |
Christopher Haster |
0:176c74479de2 | 95 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 96 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 97 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 98 | } |
Christopher Haster |
0:176c74479de2 | 99 | |
Christopher Haster |
0:176c74479de2 | 100 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 101 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 102 | */ |
Christopher Haster |
0:176c74479de2 | 103 | void attach(const FuncPtr<R(A0, A1, A2, A3)> &func) { |
Christopher Haster |
0:176c74479de2 | 104 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 105 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 106 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 107 | } |
Christopher Haster |
0:176c74479de2 | 108 | |
Christopher Haster |
0:176c74479de2 | 109 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 110 | */ |
Christopher Haster |
0:176c74479de2 | 111 | R call(A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 112 | return _thunk(_obj, &_func, a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 113 | } |
Christopher Haster |
0:176c74479de2 | 114 | |
Christopher Haster |
0:176c74479de2 | 115 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 116 | */ |
Christopher Haster |
0:176c74479de2 | 117 | R operator()(A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 118 | return call(a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 119 | } |
Christopher Haster |
0:176c74479de2 | 120 | |
Christopher Haster |
0:176c74479de2 | 121 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 122 | */ |
Christopher Haster |
0:176c74479de2 | 123 | operator bool(void) const { |
Christopher Haster |
0:176c74479de2 | 124 | return static_cast<bool>(_func); |
Christopher Haster |
0:176c74479de2 | 125 | } |
Christopher Haster |
0:176c74479de2 | 126 | |
Christopher Haster |
1:9c28068feddc | 127 | /** Static thunk for passing as C-style function |
Christopher Haster |
1:9c28068feddc | 128 | * @param funcptr FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 129 | */ |
Christopher Haster |
1:9c28068feddc | 130 | static R thunk(void *funcptr, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
1:9c28068feddc | 131 | return static_cast<FuncPtr<R(A0, A1, A2, A3)>*>(funcptr) |
Christopher Haster |
1:9c28068feddc | 132 | ->call(a0, a1, a2, a3); |
Christopher Haster |
1:9c28068feddc | 133 | } |
Christopher Haster |
1:9c28068feddc | 134 | |
Christopher Haster |
0:176c74479de2 | 135 | private: |
Christopher Haster |
0:176c74479de2 | 136 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 137 | static R _staticthunk(void*, void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 138 | return (*reinterpret_cast<R (**)(A0, A1, A2, A3)>(func)) |
Christopher Haster |
0:176c74479de2 | 139 | (a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 140 | } |
Christopher Haster |
0:176c74479de2 | 141 | |
Christopher Haster |
0:176c74479de2 | 142 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 143 | static R _boundthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 144 | return (*reinterpret_cast<R (**)(T*, A0, A1, A2, A3)>(func)) |
Christopher Haster |
0:176c74479de2 | 145 | (static_cast<T*>(obj), a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 146 | } |
Christopher Haster |
0:176c74479de2 | 147 | |
Christopher Haster |
0:176c74479de2 | 148 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 149 | static R _methodthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 150 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 151 | (*reinterpret_cast<R (T::**)(A0, A1, A2, A3)>(func))) |
Christopher Haster |
0:176c74479de2 | 152 | (a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 153 | } |
Christopher Haster |
0:176c74479de2 | 154 | |
Christopher Haster |
0:176c74479de2 | 155 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 156 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 157 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 158 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 159 | struct _class; |
Christopher Haster |
0:176c74479de2 | 160 | union { |
Christopher Haster |
0:176c74479de2 | 161 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 162 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 163 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 164 | } _func; |
Christopher Haster |
0:176c74479de2 | 165 | |
Christopher Haster |
0:176c74479de2 | 166 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 167 | R (*_thunk)(void*, void*, A0, A1, A2, A3); |
Christopher Haster |
0:176c74479de2 | 168 | }; |
Christopher Haster |
0:176c74479de2 | 169 | |
Christopher Haster |
0:176c74479de2 | 170 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 171 | */ |
Christopher Haster |
0:176c74479de2 | 172 | template <typename R, typename A0, typename A1, typename A2> |
Christopher Haster |
0:176c74479de2 | 173 | class FuncPtr<R(A0, A1, A2)> { |
Christopher Haster |
0:176c74479de2 | 174 | public: |
Christopher Haster |
0:176c74479de2 | 175 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 176 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 177 | */ |
Christopher Haster |
0:176c74479de2 | 178 | FuncPtr(R (*func)(A0, A1, A2) = 0) { |
Christopher Haster |
0:176c74479de2 | 179 | attach(func); |
Christopher Haster |
0:176c74479de2 | 180 | } |
Christopher Haster |
0:176c74479de2 | 181 | |
Christopher Haster |
0:176c74479de2 | 182 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 183 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 184 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 185 | */ |
Christopher Haster |
0:176c74479de2 | 186 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 187 | FuncPtr(T *obj, R (*func)(T*, A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 188 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 189 | } |
Christopher Haster |
0:176c74479de2 | 190 | |
Christopher Haster |
0:176c74479de2 | 191 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 192 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 193 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 194 | */ |
Christopher Haster |
0:176c74479de2 | 195 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 196 | FuncPtr(T *obj, R (T::*func)(A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 197 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 198 | } |
Christopher Haster |
0:176c74479de2 | 199 | |
Christopher Haster |
0:176c74479de2 | 200 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 201 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 202 | */ |
Christopher Haster |
0:176c74479de2 | 203 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 204 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 205 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 206 | } |
Christopher Haster |
0:176c74479de2 | 207 | |
Christopher Haster |
0:176c74479de2 | 208 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 209 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 210 | */ |
Christopher Haster |
0:176c74479de2 | 211 | FuncPtr(const FuncPtr<R(A0, A1, A2)> &func) { |
Christopher Haster |
0:176c74479de2 | 212 | attach(func); |
Christopher Haster |
0:176c74479de2 | 213 | } |
Christopher Haster |
0:176c74479de2 | 214 | |
Christopher Haster |
0:176c74479de2 | 215 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 216 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 217 | */ |
Christopher Haster |
0:176c74479de2 | 218 | void attach(R (*func)(A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 219 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 220 | _thunk = &FuncPtr::_staticthunk; |
Christopher Haster |
0:176c74479de2 | 221 | } |
Christopher Haster |
0:176c74479de2 | 222 | |
Christopher Haster |
0:176c74479de2 | 223 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 224 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 225 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 226 | */ |
Christopher Haster |
0:176c74479de2 | 227 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 228 | void attach(T *obj, R (*func)(T*, A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 229 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 230 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 231 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 232 | } |
Christopher Haster |
0:176c74479de2 | 233 | |
Christopher Haster |
0:176c74479de2 | 234 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 235 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 236 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 237 | */ |
Christopher Haster |
0:176c74479de2 | 238 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 239 | void attach(T *obj, R (T::*func)(A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 240 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 241 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 242 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 243 | } |
Christopher Haster |
0:176c74479de2 | 244 | |
Christopher Haster |
0:176c74479de2 | 245 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 246 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 247 | */ |
Christopher Haster |
0:176c74479de2 | 248 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 249 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 250 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 251 | } |
Christopher Haster |
0:176c74479de2 | 252 | |
Christopher Haster |
0:176c74479de2 | 253 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 254 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 255 | */ |
Christopher Haster |
0:176c74479de2 | 256 | void attach(const FuncPtr<R(A0, A1, A2)> &func) { |
Christopher Haster |
0:176c74479de2 | 257 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 258 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 259 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 260 | } |
Christopher Haster |
0:176c74479de2 | 261 | |
Christopher Haster |
0:176c74479de2 | 262 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 263 | */ |
Christopher Haster |
0:176c74479de2 | 264 | R call(A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 265 | return _thunk(_obj, &_func, a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 266 | } |
Christopher Haster |
0:176c74479de2 | 267 | |
Christopher Haster |
0:176c74479de2 | 268 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 269 | */ |
Christopher Haster |
0:176c74479de2 | 270 | R operator()(A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 271 | return call(a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 272 | } |
Christopher Haster |
0:176c74479de2 | 273 | |
Christopher Haster |
0:176c74479de2 | 274 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 275 | */ |
Christopher Haster |
0:176c74479de2 | 276 | operator bool(void) const { |
Christopher Haster |
0:176c74479de2 | 277 | return static_cast<bool>(_func); |
Christopher Haster |
0:176c74479de2 | 278 | } |
Christopher Haster |
0:176c74479de2 | 279 | |
Christopher Haster |
1:9c28068feddc | 280 | /** Static thunk for passing as C-style function |
Christopher Haster |
1:9c28068feddc | 281 | * @param funcptr FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 282 | */ |
Christopher Haster |
1:9c28068feddc | 283 | static R thunk(void *funcptr, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
1:9c28068feddc | 284 | return static_cast<FuncPtr<R(A0, A1, A2)>*>(funcptr) |
Christopher Haster |
1:9c28068feddc | 285 | ->call(a0, a1, a2); |
Christopher Haster |
1:9c28068feddc | 286 | } |
Christopher Haster |
1:9c28068feddc | 287 | |
Christopher Haster |
0:176c74479de2 | 288 | private: |
Christopher Haster |
0:176c74479de2 | 289 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 290 | static R _staticthunk(void*, void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 291 | return (*reinterpret_cast<R (**)(A0, A1, A2)>(func)) |
Christopher Haster |
0:176c74479de2 | 292 | (a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 293 | } |
Christopher Haster |
0:176c74479de2 | 294 | |
Christopher Haster |
0:176c74479de2 | 295 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 296 | static R _boundthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 297 | return (*reinterpret_cast<R (**)(T*, A0, A1, A2)>(func)) |
Christopher Haster |
0:176c74479de2 | 298 | (static_cast<T*>(obj), a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 299 | } |
Christopher Haster |
0:176c74479de2 | 300 | |
Christopher Haster |
0:176c74479de2 | 301 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 302 | static R _methodthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 303 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 304 | (*reinterpret_cast<R (T::**)(A0, A1, A2)>(func))) |
Christopher Haster |
0:176c74479de2 | 305 | (a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 306 | } |
Christopher Haster |
0:176c74479de2 | 307 | |
Christopher Haster |
0:176c74479de2 | 308 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 309 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 310 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 311 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 312 | struct _class; |
Christopher Haster |
0:176c74479de2 | 313 | union { |
Christopher Haster |
0:176c74479de2 | 314 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 315 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 316 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 317 | } _func; |
Christopher Haster |
0:176c74479de2 | 318 | |
Christopher Haster |
0:176c74479de2 | 319 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 320 | R (*_thunk)(void*, void*, A0, A1, A2); |
Christopher Haster |
0:176c74479de2 | 321 | }; |
Christopher Haster |
0:176c74479de2 | 322 | |
Christopher Haster |
0:176c74479de2 | 323 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 324 | */ |
Christopher Haster |
0:176c74479de2 | 325 | template <typename R, typename A0, typename A1> |
Christopher Haster |
0:176c74479de2 | 326 | class FuncPtr<R(A0, A1)> { |
Christopher Haster |
0:176c74479de2 | 327 | public: |
Christopher Haster |
0:176c74479de2 | 328 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 329 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 330 | */ |
Christopher Haster |
0:176c74479de2 | 331 | FuncPtr(R (*func)(A0, A1) = 0) { |
Christopher Haster |
0:176c74479de2 | 332 | attach(func); |
Christopher Haster |
0:176c74479de2 | 333 | } |
Christopher Haster |
0:176c74479de2 | 334 | |
Christopher Haster |
0:176c74479de2 | 335 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 336 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 337 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 338 | */ |
Christopher Haster |
0:176c74479de2 | 339 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 340 | FuncPtr(T *obj, R (*func)(T*, A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 341 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 342 | } |
Christopher Haster |
0:176c74479de2 | 343 | |
Christopher Haster |
0:176c74479de2 | 344 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 345 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 346 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 347 | */ |
Christopher Haster |
0:176c74479de2 | 348 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 349 | FuncPtr(T *obj, R (T::*func)(A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 350 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 351 | } |
Christopher Haster |
0:176c74479de2 | 352 | |
Christopher Haster |
0:176c74479de2 | 353 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 354 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 355 | */ |
Christopher Haster |
0:176c74479de2 | 356 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 357 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 358 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 359 | } |
Christopher Haster |
0:176c74479de2 | 360 | |
Christopher Haster |
0:176c74479de2 | 361 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 362 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 363 | */ |
Christopher Haster |
0:176c74479de2 | 364 | FuncPtr(const FuncPtr<R(A0, A1)> &func) { |
Christopher Haster |
0:176c74479de2 | 365 | attach(func); |
Christopher Haster |
0:176c74479de2 | 366 | } |
Christopher Haster |
0:176c74479de2 | 367 | |
Christopher Haster |
0:176c74479de2 | 368 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 369 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 370 | */ |
Christopher Haster |
0:176c74479de2 | 371 | void attach(R (*func)(A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 372 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 373 | _thunk = &FuncPtr::_staticthunk; |
Christopher Haster |
0:176c74479de2 | 374 | } |
Christopher Haster |
0:176c74479de2 | 375 | |
Christopher Haster |
0:176c74479de2 | 376 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 377 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 378 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 379 | */ |
Christopher Haster |
0:176c74479de2 | 380 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 381 | void attach(T *obj, R (*func)(T*, A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 382 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 383 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 384 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 385 | } |
Christopher Haster |
0:176c74479de2 | 386 | |
Christopher Haster |
0:176c74479de2 | 387 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 388 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 389 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 390 | */ |
Christopher Haster |
0:176c74479de2 | 391 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 392 | void attach(T *obj, R (T::*func)(A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 393 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 394 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 395 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 396 | } |
Christopher Haster |
0:176c74479de2 | 397 | |
Christopher Haster |
0:176c74479de2 | 398 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 399 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 400 | */ |
Christopher Haster |
0:176c74479de2 | 401 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 402 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 403 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 404 | } |
Christopher Haster |
0:176c74479de2 | 405 | |
Christopher Haster |
0:176c74479de2 | 406 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 407 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 408 | */ |
Christopher Haster |
0:176c74479de2 | 409 | void attach(const FuncPtr<R(A0, A1)> &func) { |
Christopher Haster |
0:176c74479de2 | 410 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 411 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 412 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 413 | } |
Christopher Haster |
0:176c74479de2 | 414 | |
Christopher Haster |
0:176c74479de2 | 415 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 416 | */ |
Christopher Haster |
0:176c74479de2 | 417 | R call(A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 418 | return _thunk(_obj, &_func, a0, a1); |
Christopher Haster |
0:176c74479de2 | 419 | } |
Christopher Haster |
0:176c74479de2 | 420 | |
Christopher Haster |
0:176c74479de2 | 421 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 422 | */ |
Christopher Haster |
0:176c74479de2 | 423 | R operator()(A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 424 | return call(a0, a1); |
Christopher Haster |
0:176c74479de2 | 425 | } |
Christopher Haster |
0:176c74479de2 | 426 | |
Christopher Haster |
0:176c74479de2 | 427 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 428 | */ |
Christopher Haster |
0:176c74479de2 | 429 | operator bool(void) const { |
Christopher Haster |
0:176c74479de2 | 430 | return static_cast<bool>(_func); |
Christopher Haster |
0:176c74479de2 | 431 | } |
Christopher Haster |
0:176c74479de2 | 432 | |
Christopher Haster |
1:9c28068feddc | 433 | /** Static thunk for passing as C-style function |
Christopher Haster |
1:9c28068feddc | 434 | * @param funcptr FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 435 | */ |
Christopher Haster |
1:9c28068feddc | 436 | static R thunk(void *funcptr, A0 a0, A1 a1) { |
Christopher Haster |
1:9c28068feddc | 437 | return static_cast<FuncPtr<R(A0, A1)>*>(funcptr) |
Christopher Haster |
1:9c28068feddc | 438 | ->call(a0, a1); |
Christopher Haster |
1:9c28068feddc | 439 | } |
Christopher Haster |
1:9c28068feddc | 440 | |
Christopher Haster |
0:176c74479de2 | 441 | private: |
Christopher Haster |
0:176c74479de2 | 442 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 443 | static R _staticthunk(void*, void *func, A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 444 | return (*reinterpret_cast<R (**)(A0, A1)>(func)) |
Christopher Haster |
0:176c74479de2 | 445 | (a0, a1); |
Christopher Haster |
0:176c74479de2 | 446 | } |
Christopher Haster |
0:176c74479de2 | 447 | |
Christopher Haster |
0:176c74479de2 | 448 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 449 | static R _boundthunk(void *obj, void *func, A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 450 | return (*reinterpret_cast<R (**)(T*, A0, A1)>(func)) |
Christopher Haster |
0:176c74479de2 | 451 | (static_cast<T*>(obj), a0, a1); |
Christopher Haster |
0:176c74479de2 | 452 | } |
Christopher Haster |
0:176c74479de2 | 453 | |
Christopher Haster |
0:176c74479de2 | 454 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 455 | static R _methodthunk(void *obj, void *func, A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 456 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 457 | (*reinterpret_cast<R (T::**)(A0, A1)>(func))) |
Christopher Haster |
0:176c74479de2 | 458 | (a0, a1); |
Christopher Haster |
0:176c74479de2 | 459 | } |
Christopher Haster |
0:176c74479de2 | 460 | |
Christopher Haster |
0:176c74479de2 | 461 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 462 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 463 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 464 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 465 | struct _class; |
Christopher Haster |
0:176c74479de2 | 466 | union { |
Christopher Haster |
0:176c74479de2 | 467 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 468 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 469 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 470 | } _func; |
Christopher Haster |
0:176c74479de2 | 471 | |
Christopher Haster |
0:176c74479de2 | 472 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 473 | R (*_thunk)(void*, void*, A0, A1); |
Christopher Haster |
0:176c74479de2 | 474 | }; |
Christopher Haster |
0:176c74479de2 | 475 | |
Christopher Haster |
0:176c74479de2 | 476 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 477 | */ |
Christopher Haster |
0:176c74479de2 | 478 | template <typename R, typename A0> |
Christopher Haster |
0:176c74479de2 | 479 | class FuncPtr<R(A0)> { |
Christopher Haster |
0:176c74479de2 | 480 | public: |
Christopher Haster |
0:176c74479de2 | 481 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 482 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 483 | */ |
Christopher Haster |
0:176c74479de2 | 484 | FuncPtr(R (*func)(A0) = 0) { |
Christopher Haster |
0:176c74479de2 | 485 | attach(func); |
Christopher Haster |
0:176c74479de2 | 486 | } |
Christopher Haster |
0:176c74479de2 | 487 | |
Christopher Haster |
0:176c74479de2 | 488 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 489 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 490 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 491 | */ |
Christopher Haster |
0:176c74479de2 | 492 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 493 | FuncPtr(T *obj, R (*func)(T*, A0)) { |
Christopher Haster |
0:176c74479de2 | 494 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 495 | } |
Christopher Haster |
0:176c74479de2 | 496 | |
Christopher Haster |
0:176c74479de2 | 497 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 498 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 499 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 500 | */ |
Christopher Haster |
0:176c74479de2 | 501 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 502 | FuncPtr(T *obj, R (T::*func)(A0)) { |
Christopher Haster |
0:176c74479de2 | 503 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 504 | } |
Christopher Haster |
0:176c74479de2 | 505 | |
Christopher Haster |
0:176c74479de2 | 506 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 507 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 508 | */ |
Christopher Haster |
0:176c74479de2 | 509 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 510 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 511 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 512 | } |
Christopher Haster |
0:176c74479de2 | 513 | |
Christopher Haster |
0:176c74479de2 | 514 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 515 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 516 | */ |
Christopher Haster |
0:176c74479de2 | 517 | FuncPtr(const FuncPtr<R(A0)> &func) { |
Christopher Haster |
0:176c74479de2 | 518 | attach(func); |
Christopher Haster |
0:176c74479de2 | 519 | } |
Christopher Haster |
0:176c74479de2 | 520 | |
Christopher Haster |
0:176c74479de2 | 521 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 522 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 523 | */ |
Christopher Haster |
0:176c74479de2 | 524 | void attach(R (*func)(A0)) { |
Christopher Haster |
0:176c74479de2 | 525 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 526 | _thunk = &FuncPtr::_staticthunk; |
Christopher Haster |
0:176c74479de2 | 527 | } |
Christopher Haster |
0:176c74479de2 | 528 | |
Christopher Haster |
0:176c74479de2 | 529 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 530 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 531 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 532 | */ |
Christopher Haster |
0:176c74479de2 | 533 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 534 | void attach(T *obj, R (*func)(T*, A0)) { |
Christopher Haster |
0:176c74479de2 | 535 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 536 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 537 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 538 | } |
Christopher Haster |
0:176c74479de2 | 539 | |
Christopher Haster |
0:176c74479de2 | 540 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 541 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 542 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 543 | */ |
Christopher Haster |
0:176c74479de2 | 544 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 545 | void attach(T *obj, R (T::*func)(A0)) { |
Christopher Haster |
0:176c74479de2 | 546 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 547 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 548 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 549 | } |
Christopher Haster |
0:176c74479de2 | 550 | |
Christopher Haster |
0:176c74479de2 | 551 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 552 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 553 | */ |
Christopher Haster |
0:176c74479de2 | 554 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 555 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 556 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 557 | } |
Christopher Haster |
0:176c74479de2 | 558 | |
Christopher Haster |
0:176c74479de2 | 559 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 560 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 561 | */ |
Christopher Haster |
0:176c74479de2 | 562 | void attach(const FuncPtr<R(A0)> &func) { |
Christopher Haster |
0:176c74479de2 | 563 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 564 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 565 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 566 | } |
Christopher Haster |
0:176c74479de2 | 567 | |
Christopher Haster |
0:176c74479de2 | 568 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 569 | */ |
Christopher Haster |
0:176c74479de2 | 570 | R call(A0 a0) { |
Christopher Haster |
0:176c74479de2 | 571 | return _thunk(_obj, &_func, a0); |
Christopher Haster |
0:176c74479de2 | 572 | } |
Christopher Haster |
0:176c74479de2 | 573 | |
Christopher Haster |
0:176c74479de2 | 574 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 575 | */ |
Christopher Haster |
0:176c74479de2 | 576 | R operator()(A0 a0) { |
Christopher Haster |
0:176c74479de2 | 577 | return call(a0); |
Christopher Haster |
0:176c74479de2 | 578 | } |
Christopher Haster |
0:176c74479de2 | 579 | |
Christopher Haster |
0:176c74479de2 | 580 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 581 | */ |
Christopher Haster |
0:176c74479de2 | 582 | operator bool(void) const { |
Christopher Haster |
0:176c74479de2 | 583 | return static_cast<bool>(_func); |
Christopher Haster |
0:176c74479de2 | 584 | } |
Christopher Haster |
0:176c74479de2 | 585 | |
Christopher Haster |
1:9c28068feddc | 586 | /** Static thunk for passing as C-style function |
Christopher Haster |
1:9c28068feddc | 587 | * @param funcptr FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 588 | */ |
Christopher Haster |
1:9c28068feddc | 589 | static R thunk(void *funcptr, A0 a0) { |
Christopher Haster |
1:9c28068feddc | 590 | return static_cast<FuncPtr<R(A0)>*>(funcptr) |
Christopher Haster |
1:9c28068feddc | 591 | ->call(a0); |
Christopher Haster |
1:9c28068feddc | 592 | } |
Christopher Haster |
1:9c28068feddc | 593 | |
Christopher Haster |
0:176c74479de2 | 594 | private: |
Christopher Haster |
0:176c74479de2 | 595 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 596 | static R _staticthunk(void*, void *func, A0 a0) { |
Christopher Haster |
0:176c74479de2 | 597 | return (*reinterpret_cast<R (**)(A0)>(func)) |
Christopher Haster |
0:176c74479de2 | 598 | (a0); |
Christopher Haster |
0:176c74479de2 | 599 | } |
Christopher Haster |
0:176c74479de2 | 600 | |
Christopher Haster |
0:176c74479de2 | 601 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 602 | static R _boundthunk(void *obj, void *func, A0 a0) { |
Christopher Haster |
0:176c74479de2 | 603 | return (*reinterpret_cast<R (**)(T*, A0)>(func)) |
Christopher Haster |
0:176c74479de2 | 604 | (static_cast<T*>(obj), a0); |
Christopher Haster |
0:176c74479de2 | 605 | } |
Christopher Haster |
0:176c74479de2 | 606 | |
Christopher Haster |
0:176c74479de2 | 607 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 608 | static R _methodthunk(void *obj, void *func, A0 a0) { |
Christopher Haster |
0:176c74479de2 | 609 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 610 | (*reinterpret_cast<R (T::**)(A0)>(func))) |
Christopher Haster |
0:176c74479de2 | 611 | (a0); |
Christopher Haster |
0:176c74479de2 | 612 | } |
Christopher Haster |
0:176c74479de2 | 613 | |
Christopher Haster |
0:176c74479de2 | 614 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 615 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 616 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 617 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 618 | struct _class; |
Christopher Haster |
0:176c74479de2 | 619 | union { |
Christopher Haster |
0:176c74479de2 | 620 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 621 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 622 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 623 | } _func; |
Christopher Haster |
0:176c74479de2 | 624 | |
Christopher Haster |
0:176c74479de2 | 625 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 626 | R (*_thunk)(void*, void*, A0); |
Christopher Haster |
0:176c74479de2 | 627 | }; |
Christopher Haster |
0:176c74479de2 | 628 | |
Christopher Haster |
0:176c74479de2 | 629 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 630 | */ |
Christopher Haster |
0:176c74479de2 | 631 | template <typename R> |
Christopher Haster |
0:176c74479de2 | 632 | class FuncPtr<R()> { |
Christopher Haster |
0:176c74479de2 | 633 | public: |
Christopher Haster |
0:176c74479de2 | 634 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 635 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 636 | */ |
Christopher Haster |
0:176c74479de2 | 637 | FuncPtr(R (*func)() = 0) { |
Christopher Haster |
0:176c74479de2 | 638 | attach(func); |
Christopher Haster |
0:176c74479de2 | 639 | } |
Christopher Haster |
0:176c74479de2 | 640 | |
Christopher Haster |
0:176c74479de2 | 641 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 642 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 643 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 644 | */ |
Christopher Haster |
0:176c74479de2 | 645 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 646 | FuncPtr(T *obj, R (*func)(T*)) { |
Christopher Haster |
0:176c74479de2 | 647 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 648 | } |
Christopher Haster |
0:176c74479de2 | 649 | |
Christopher Haster |
0:176c74479de2 | 650 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 651 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 652 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 653 | */ |
Christopher Haster |
0:176c74479de2 | 654 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 655 | FuncPtr(T *obj, R (T::*func)()) { |
Christopher Haster |
0:176c74479de2 | 656 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 657 | } |
Christopher Haster |
0:176c74479de2 | 658 | |
Christopher Haster |
0:176c74479de2 | 659 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 660 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 661 | */ |
Christopher Haster |
0:176c74479de2 | 662 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 663 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 664 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 665 | } |
Christopher Haster |
0:176c74479de2 | 666 | |
Christopher Haster |
0:176c74479de2 | 667 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 668 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 669 | */ |
Christopher Haster |
0:176c74479de2 | 670 | FuncPtr(const FuncPtr<R()> &func) { |
Christopher Haster |
0:176c74479de2 | 671 | attach(func); |
Christopher Haster |
0:176c74479de2 | 672 | } |
Christopher Haster |
0:176c74479de2 | 673 | |
Christopher Haster |
0:176c74479de2 | 674 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 675 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 676 | */ |
Christopher Haster |
0:176c74479de2 | 677 | void attach(R (*func)()) { |
Christopher Haster |
0:176c74479de2 | 678 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 679 | _thunk = &FuncPtr::_staticthunk; |
Christopher Haster |
0:176c74479de2 | 680 | } |
Christopher Haster |
0:176c74479de2 | 681 | |
Christopher Haster |
0:176c74479de2 | 682 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 683 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 684 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 685 | */ |
Christopher Haster |
0:176c74479de2 | 686 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 687 | void attach(T *obj, R (*func)(T*)) { |
Christopher Haster |
0:176c74479de2 | 688 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 689 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 690 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 691 | } |
Christopher Haster |
0:176c74479de2 | 692 | |
Christopher Haster |
0:176c74479de2 | 693 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 694 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 695 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 696 | */ |
Christopher Haster |
0:176c74479de2 | 697 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 698 | void attach(T *obj, R (T::*func)()) { |
Christopher Haster |
0:176c74479de2 | 699 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 700 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 701 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 702 | } |
Christopher Haster |
0:176c74479de2 | 703 | |
Christopher Haster |
0:176c74479de2 | 704 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 705 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 706 | */ |
Christopher Haster |
0:176c74479de2 | 707 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 708 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 709 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 710 | } |
Christopher Haster |
0:176c74479de2 | 711 | |
Christopher Haster |
0:176c74479de2 | 712 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 713 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 714 | */ |
Christopher Haster |
0:176c74479de2 | 715 | void attach(const FuncPtr<R()> &func) { |
Christopher Haster |
0:176c74479de2 | 716 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 717 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 718 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 719 | } |
Christopher Haster |
0:176c74479de2 | 720 | |
Christopher Haster |
0:176c74479de2 | 721 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 722 | */ |
Christopher Haster |
0:176c74479de2 | 723 | R call() { |
Christopher Haster |
0:176c74479de2 | 724 | return _thunk(_obj, &_func); |
Christopher Haster |
0:176c74479de2 | 725 | } |
Christopher Haster |
0:176c74479de2 | 726 | |
Christopher Haster |
0:176c74479de2 | 727 | /** Call the attached static or member function |
Christopher Haster |
0:176c74479de2 | 728 | */ |
Christopher Haster |
0:176c74479de2 | 729 | R operator()() { |
Christopher Haster |
0:176c74479de2 | 730 | return call(); |
Christopher Haster |
0:176c74479de2 | 731 | } |
Christopher Haster |
0:176c74479de2 | 732 | |
Christopher Haster |
0:176c74479de2 | 733 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 734 | */ |
Christopher Haster |
0:176c74479de2 | 735 | operator bool(void) const { |
Christopher Haster |
0:176c74479de2 | 736 | return static_cast<bool>(_func); |
Christopher Haster |
0:176c74479de2 | 737 | } |
Christopher Haster |
0:176c74479de2 | 738 | |
Christopher Haster |
1:9c28068feddc | 739 | /** Static thunk for passing as C-style function |
Christopher Haster |
1:9c28068feddc | 740 | * @param funcptr FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 741 | */ |
Christopher Haster |
1:9c28068feddc | 742 | static R thunk(void *funcptr) { |
Christopher Haster |
1:9c28068feddc | 743 | return static_cast<FuncPtr<R()>*>(funcptr) |
Christopher Haster |
1:9c28068feddc | 744 | ->call(); |
Christopher Haster |
1:9c28068feddc | 745 | } |
Christopher Haster |
1:9c28068feddc | 746 | |
Christopher Haster |
0:176c74479de2 | 747 | private: |
Christopher Haster |
0:176c74479de2 | 748 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 749 | static R _staticthunk(void*, void *func) { |
Christopher Haster |
0:176c74479de2 | 750 | return (*reinterpret_cast<R (**)()>(func)) |
Christopher Haster |
0:176c74479de2 | 751 | (); |
Christopher Haster |
0:176c74479de2 | 752 | } |
Christopher Haster |
0:176c74479de2 | 753 | |
Christopher Haster |
0:176c74479de2 | 754 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 755 | static R _boundthunk(void *obj, void *func) { |
Christopher Haster |
0:176c74479de2 | 756 | return (*reinterpret_cast<R (**)(T*)>(func)) |
Christopher Haster |
0:176c74479de2 | 757 | (static_cast<T*>(obj)); |
Christopher Haster |
0:176c74479de2 | 758 | } |
Christopher Haster |
0:176c74479de2 | 759 | |
Christopher Haster |
0:176c74479de2 | 760 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 761 | static R _methodthunk(void *obj, void *func) { |
Christopher Haster |
0:176c74479de2 | 762 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 763 | (*reinterpret_cast<R (T::**)()>(func))) |
Christopher Haster |
0:176c74479de2 | 764 | (); |
Christopher Haster |
0:176c74479de2 | 765 | } |
Christopher Haster |
0:176c74479de2 | 766 | |
Christopher Haster |
0:176c74479de2 | 767 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 768 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 769 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 770 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 771 | struct _class; |
Christopher Haster |
0:176c74479de2 | 772 | union { |
Christopher Haster |
0:176c74479de2 | 773 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 774 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 775 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 776 | } _func; |
Christopher Haster |
0:176c74479de2 | 777 | |
Christopher Haster |
0:176c74479de2 | 778 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 779 | R (*_thunk)(void*, void*); |
Christopher Haster |
0:176c74479de2 | 780 | }; |
Christopher Haster |
0:176c74479de2 | 781 | |
Christopher Haster |
0:176c74479de2 | 782 | |
Christopher Haster |
0:176c74479de2 | 783 | #endif |