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@8:71037a47492d, 2016-04-17 (annotated)
- Committer:
- Christopher Haster
- Date:
- Sun Apr 17 15:52:35 2016 -0500
- Revision:
- 8:71037a47492d
- Parent:
- 6:b5f0551273f6
- Child:
- 11:035e0728d927
Standardized empty argument methods
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
Christopher Haster |
2:56e1906f7103 | 1 | /* FuncPtr |
Christopher Haster |
2:56e1906f7103 | 2 | * |
Christopher Haster |
0:176c74479de2 | 3 | * Flexible templated function class that avoids dynamic memory |
Christopher Haster |
0:176c74479de2 | 4 | * allocation without limiting functionality |
Christopher Haster |
0:176c74479de2 | 5 | */ |
Christopher Haster |
0:176c74479de2 | 6 | #ifndef FUNCPTR_H |
Christopher Haster |
0:176c74479de2 | 7 | #define FUNCPTR_H |
Christopher Haster |
0:176c74479de2 | 8 | |
Christopher Haster |
0:176c74479de2 | 9 | #include <string.h> |
Christopher Haster |
0:176c74479de2 | 10 | #include <stdint.h> |
Christopher Haster |
0:176c74479de2 | 11 | |
Christopher Haster |
0:176c74479de2 | 12 | |
Christopher Haster |
0:176c74479de2 | 13 | /** FuncPtr class based on template specialization |
Christopher Haster |
0:176c74479de2 | 14 | */ |
Christopher Haster |
0:176c74479de2 | 15 | template <typename F> |
Christopher Haster |
0:176c74479de2 | 16 | class FuncPtr; |
Christopher Haster |
0:176c74479de2 | 17 | |
Christopher Haster |
0:176c74479de2 | 18 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 19 | */ |
Christopher Haster |
0:176c74479de2 | 20 | template <typename R, typename A0, typename A1, typename A2, typename A3> |
Christopher Haster |
0:176c74479de2 | 21 | class FuncPtr<R(A0, A1, A2, A3)> { |
Christopher Haster |
0:176c74479de2 | 22 | public: |
Christopher Haster |
0:176c74479de2 | 23 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 24 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 25 | */ |
Christopher Haster |
0:176c74479de2 | 26 | FuncPtr(R (*func)(A0, A1, A2, A3) = 0) { |
Christopher Haster |
0:176c74479de2 | 27 | attach(func); |
Christopher Haster |
0:176c74479de2 | 28 | } |
Christopher Haster |
0:176c74479de2 | 29 | |
Christopher Haster |
0:176c74479de2 | 30 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 31 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 32 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 33 | */ |
Christopher Haster |
0:176c74479de2 | 34 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 35 | FuncPtr(T *obj, R (*func)(T*, A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 36 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 37 | } |
Christopher Haster |
0:176c74479de2 | 38 | |
Christopher Haster |
0:176c74479de2 | 39 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 40 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 41 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 42 | */ |
Christopher Haster |
0:176c74479de2 | 43 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 44 | FuncPtr(T *obj, R (T::*func)(A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 45 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 46 | } |
Christopher Haster |
0:176c74479de2 | 47 | |
Christopher Haster |
0:176c74479de2 | 48 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 49 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 50 | */ |
Christopher Haster |
0:176c74479de2 | 51 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 52 | FuncPtr(T *obj) { |
Christopher Haster |
0:176c74479de2 | 53 | attach(obj, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 54 | } |
Christopher Haster |
0:176c74479de2 | 55 | |
Christopher Haster |
0:176c74479de2 | 56 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 57 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 58 | */ |
Christopher Haster |
0:176c74479de2 | 59 | FuncPtr(const FuncPtr<R(A0, A1, A2, A3)> &func) { |
Christopher Haster |
0:176c74479de2 | 60 | attach(func); |
Christopher Haster |
0:176c74479de2 | 61 | } |
Christopher Haster |
0:176c74479de2 | 62 | |
Christopher Haster |
0:176c74479de2 | 63 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 64 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 65 | */ |
Christopher Haster |
0:176c74479de2 | 66 | void attach(R (*func)(A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 67 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
6:b5f0551273f6 | 68 | _thunk = func ? &FuncPtr::_staticthunk : 0; |
Christopher Haster |
0:176c74479de2 | 69 | } |
Christopher Haster |
0:176c74479de2 | 70 | |
Christopher Haster |
0:176c74479de2 | 71 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 72 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 73 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 74 | */ |
Christopher Haster |
0:176c74479de2 | 75 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 76 | void attach(T *obj, R (*func)(T*, A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 77 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 78 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 79 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 80 | } |
Christopher Haster |
0:176c74479de2 | 81 | |
Christopher Haster |
0:176c74479de2 | 82 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 83 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 84 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 85 | */ |
Christopher Haster |
0:176c74479de2 | 86 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 87 | void attach(T *obj, R (T::*func)(A0, A1, A2, A3)) { |
Christopher Haster |
0:176c74479de2 | 88 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 89 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 90 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 91 | } |
Christopher Haster |
0:176c74479de2 | 92 | |
Christopher Haster |
0:176c74479de2 | 93 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 94 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 95 | */ |
Christopher Haster |
0:176c74479de2 | 96 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 97 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 98 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 99 | } |
Christopher Haster |
0:176c74479de2 | 100 | |
Christopher Haster |
0:176c74479de2 | 101 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 102 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 103 | */ |
Christopher Haster |
0:176c74479de2 | 104 | void attach(const FuncPtr<R(A0, A1, A2, A3)> &func) { |
Christopher Haster |
0:176c74479de2 | 105 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 106 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 107 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 108 | } |
Christopher Haster |
0:176c74479de2 | 109 | |
Christopher Haster |
2:56e1906f7103 | 110 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 111 | */ |
Christopher Haster |
0:176c74479de2 | 112 | R call(A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 113 | return _thunk(_obj, &_func, a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 114 | } |
Christopher Haster |
0:176c74479de2 | 115 | |
Christopher Haster |
2:56e1906f7103 | 116 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 117 | */ |
Christopher Haster |
0:176c74479de2 | 118 | R operator()(A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 119 | return call(a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 120 | } |
Christopher Haster |
0:176c74479de2 | 121 | |
Christopher Haster |
0:176c74479de2 | 122 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 123 | */ |
Christopher Haster |
8:71037a47492d | 124 | operator bool() const { |
Christopher Haster |
6:b5f0551273f6 | 125 | return _thunk; |
Christopher Haster |
0:176c74479de2 | 126 | } |
Christopher Haster |
0:176c74479de2 | 127 | |
Christopher Haster |
1:9c28068feddc | 128 | /** Static thunk for passing as C-style function |
Christopher Haster |
2:56e1906f7103 | 129 | * @param func FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 130 | */ |
Christopher Haster |
2:56e1906f7103 | 131 | static R thunk(void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
2:56e1906f7103 | 132 | return static_cast<FuncPtr<R(A0, A1, A2, A3)>*>(func) |
Christopher Haster |
1:9c28068feddc | 133 | ->call(a0, a1, a2, a3); |
Christopher Haster |
1:9c28068feddc | 134 | } |
Christopher Haster |
1:9c28068feddc | 135 | |
Christopher Haster |
0:176c74479de2 | 136 | private: |
Christopher Haster |
0:176c74479de2 | 137 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 138 | static R _staticthunk(void*, void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 139 | return (*reinterpret_cast<R (**)(A0, A1, A2, A3)>(func)) |
Christopher Haster |
0:176c74479de2 | 140 | (a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 141 | } |
Christopher Haster |
0:176c74479de2 | 142 | |
Christopher Haster |
0:176c74479de2 | 143 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 144 | static R _boundthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 145 | return (*reinterpret_cast<R (**)(T*, A0, A1, A2, A3)>(func)) |
Christopher Haster |
0:176c74479de2 | 146 | (static_cast<T*>(obj), a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 147 | } |
Christopher Haster |
0:176c74479de2 | 148 | |
Christopher Haster |
0:176c74479de2 | 149 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 150 | static R _methodthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2, A3 a3) { |
Christopher Haster |
0:176c74479de2 | 151 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 152 | (*reinterpret_cast<R (T::**)(A0, A1, A2, A3)>(func))) |
Christopher Haster |
0:176c74479de2 | 153 | (a0, a1, a2, a3); |
Christopher Haster |
0:176c74479de2 | 154 | } |
Christopher Haster |
0:176c74479de2 | 155 | |
Christopher Haster |
0:176c74479de2 | 156 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 157 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 158 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 159 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 160 | struct _class; |
Christopher Haster |
0:176c74479de2 | 161 | union { |
Christopher Haster |
0:176c74479de2 | 162 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 163 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 164 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 165 | } _func; |
Christopher Haster |
0:176c74479de2 | 166 | |
Christopher Haster |
0:176c74479de2 | 167 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 168 | R (*_thunk)(void*, void*, A0, A1, A2, A3); |
Christopher Haster |
0:176c74479de2 | 169 | }; |
Christopher Haster |
0:176c74479de2 | 170 | |
Christopher Haster |
0:176c74479de2 | 171 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 172 | */ |
Christopher Haster |
0:176c74479de2 | 173 | template <typename R, typename A0, typename A1, typename A2> |
Christopher Haster |
0:176c74479de2 | 174 | class FuncPtr<R(A0, A1, A2)> { |
Christopher Haster |
0:176c74479de2 | 175 | public: |
Christopher Haster |
0:176c74479de2 | 176 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 177 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 178 | */ |
Christopher Haster |
0:176c74479de2 | 179 | FuncPtr(R (*func)(A0, A1, A2) = 0) { |
Christopher Haster |
0:176c74479de2 | 180 | attach(func); |
Christopher Haster |
0:176c74479de2 | 181 | } |
Christopher Haster |
0:176c74479de2 | 182 | |
Christopher Haster |
0:176c74479de2 | 183 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 184 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 185 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 186 | */ |
Christopher Haster |
0:176c74479de2 | 187 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 188 | FuncPtr(T *obj, R (*func)(T*, A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 189 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 190 | } |
Christopher Haster |
0:176c74479de2 | 191 | |
Christopher Haster |
0:176c74479de2 | 192 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 193 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 194 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 195 | */ |
Christopher Haster |
0:176c74479de2 | 196 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 197 | FuncPtr(T *obj, R (T::*func)(A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 198 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 199 | } |
Christopher Haster |
0:176c74479de2 | 200 | |
Christopher Haster |
0:176c74479de2 | 201 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 202 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 203 | */ |
Christopher Haster |
0:176c74479de2 | 204 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 205 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 206 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 207 | } |
Christopher Haster |
0:176c74479de2 | 208 | |
Christopher Haster |
0:176c74479de2 | 209 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 210 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 211 | */ |
Christopher Haster |
0:176c74479de2 | 212 | FuncPtr(const FuncPtr<R(A0, A1, A2)> &func) { |
Christopher Haster |
0:176c74479de2 | 213 | attach(func); |
Christopher Haster |
0:176c74479de2 | 214 | } |
Christopher Haster |
0:176c74479de2 | 215 | |
Christopher Haster |
0:176c74479de2 | 216 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 217 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 218 | */ |
Christopher Haster |
0:176c74479de2 | 219 | void attach(R (*func)(A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 220 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
6:b5f0551273f6 | 221 | _thunk = func ? &FuncPtr::_staticthunk : 0; |
Christopher Haster |
0:176c74479de2 | 222 | } |
Christopher Haster |
0:176c74479de2 | 223 | |
Christopher Haster |
0:176c74479de2 | 224 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 225 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 226 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 227 | */ |
Christopher Haster |
0:176c74479de2 | 228 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 229 | void attach(T *obj, R (*func)(T*, A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 230 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 231 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 232 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 233 | } |
Christopher Haster |
0:176c74479de2 | 234 | |
Christopher Haster |
0:176c74479de2 | 235 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 236 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 237 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 238 | */ |
Christopher Haster |
0:176c74479de2 | 239 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 240 | void attach(T *obj, R (T::*func)(A0, A1, A2)) { |
Christopher Haster |
0:176c74479de2 | 241 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 242 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 243 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 244 | } |
Christopher Haster |
0:176c74479de2 | 245 | |
Christopher Haster |
0:176c74479de2 | 246 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 247 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 248 | */ |
Christopher Haster |
0:176c74479de2 | 249 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 250 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 251 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 252 | } |
Christopher Haster |
0:176c74479de2 | 253 | |
Christopher Haster |
0:176c74479de2 | 254 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 255 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 256 | */ |
Christopher Haster |
0:176c74479de2 | 257 | void attach(const FuncPtr<R(A0, A1, A2)> &func) { |
Christopher Haster |
0:176c74479de2 | 258 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 259 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 260 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 261 | } |
Christopher Haster |
0:176c74479de2 | 262 | |
Christopher Haster |
2:56e1906f7103 | 263 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 264 | */ |
Christopher Haster |
0:176c74479de2 | 265 | R call(A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 266 | return _thunk(_obj, &_func, a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 267 | } |
Christopher Haster |
0:176c74479de2 | 268 | |
Christopher Haster |
2:56e1906f7103 | 269 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 270 | */ |
Christopher Haster |
0:176c74479de2 | 271 | R operator()(A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 272 | return call(a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 273 | } |
Christopher Haster |
0:176c74479de2 | 274 | |
Christopher Haster |
0:176c74479de2 | 275 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 276 | */ |
Christopher Haster |
8:71037a47492d | 277 | operator bool() const { |
Christopher Haster |
6:b5f0551273f6 | 278 | return _thunk; |
Christopher Haster |
0:176c74479de2 | 279 | } |
Christopher Haster |
0:176c74479de2 | 280 | |
Christopher Haster |
1:9c28068feddc | 281 | /** Static thunk for passing as C-style function |
Christopher Haster |
2:56e1906f7103 | 282 | * @param func FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 283 | */ |
Christopher Haster |
2:56e1906f7103 | 284 | static R thunk(void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
2:56e1906f7103 | 285 | return static_cast<FuncPtr<R(A0, A1, A2)>*>(func) |
Christopher Haster |
1:9c28068feddc | 286 | ->call(a0, a1, a2); |
Christopher Haster |
1:9c28068feddc | 287 | } |
Christopher Haster |
1:9c28068feddc | 288 | |
Christopher Haster |
0:176c74479de2 | 289 | private: |
Christopher Haster |
0:176c74479de2 | 290 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 291 | static R _staticthunk(void*, void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 292 | return (*reinterpret_cast<R (**)(A0, A1, A2)>(func)) |
Christopher Haster |
0:176c74479de2 | 293 | (a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 294 | } |
Christopher Haster |
0:176c74479de2 | 295 | |
Christopher Haster |
0:176c74479de2 | 296 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 297 | static R _boundthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 298 | return (*reinterpret_cast<R (**)(T*, A0, A1, A2)>(func)) |
Christopher Haster |
0:176c74479de2 | 299 | (static_cast<T*>(obj), a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 300 | } |
Christopher Haster |
0:176c74479de2 | 301 | |
Christopher Haster |
0:176c74479de2 | 302 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 303 | static R _methodthunk(void *obj, void *func, A0 a0, A1 a1, A2 a2) { |
Christopher Haster |
0:176c74479de2 | 304 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 305 | (*reinterpret_cast<R (T::**)(A0, A1, A2)>(func))) |
Christopher Haster |
0:176c74479de2 | 306 | (a0, a1, a2); |
Christopher Haster |
0:176c74479de2 | 307 | } |
Christopher Haster |
0:176c74479de2 | 308 | |
Christopher Haster |
0:176c74479de2 | 309 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 310 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 311 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 312 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 313 | struct _class; |
Christopher Haster |
0:176c74479de2 | 314 | union { |
Christopher Haster |
0:176c74479de2 | 315 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 316 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 317 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 318 | } _func; |
Christopher Haster |
0:176c74479de2 | 319 | |
Christopher Haster |
0:176c74479de2 | 320 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 321 | R (*_thunk)(void*, void*, A0, A1, A2); |
Christopher Haster |
0:176c74479de2 | 322 | }; |
Christopher Haster |
0:176c74479de2 | 323 | |
Christopher Haster |
0:176c74479de2 | 324 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 325 | */ |
Christopher Haster |
0:176c74479de2 | 326 | template <typename R, typename A0, typename A1> |
Christopher Haster |
0:176c74479de2 | 327 | class FuncPtr<R(A0, A1)> { |
Christopher Haster |
0:176c74479de2 | 328 | public: |
Christopher Haster |
0:176c74479de2 | 329 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 330 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 331 | */ |
Christopher Haster |
0:176c74479de2 | 332 | FuncPtr(R (*func)(A0, A1) = 0) { |
Christopher Haster |
0:176c74479de2 | 333 | attach(func); |
Christopher Haster |
0:176c74479de2 | 334 | } |
Christopher Haster |
0:176c74479de2 | 335 | |
Christopher Haster |
0:176c74479de2 | 336 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 337 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 338 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 339 | */ |
Christopher Haster |
0:176c74479de2 | 340 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 341 | FuncPtr(T *obj, R (*func)(T*, A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 342 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 343 | } |
Christopher Haster |
0:176c74479de2 | 344 | |
Christopher Haster |
0:176c74479de2 | 345 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 346 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 347 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 348 | */ |
Christopher Haster |
0:176c74479de2 | 349 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 350 | FuncPtr(T *obj, R (T::*func)(A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 351 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 352 | } |
Christopher Haster |
0:176c74479de2 | 353 | |
Christopher Haster |
0:176c74479de2 | 354 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 355 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 356 | */ |
Christopher Haster |
0:176c74479de2 | 357 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 358 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 359 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 360 | } |
Christopher Haster |
0:176c74479de2 | 361 | |
Christopher Haster |
0:176c74479de2 | 362 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 363 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 364 | */ |
Christopher Haster |
0:176c74479de2 | 365 | FuncPtr(const FuncPtr<R(A0, A1)> &func) { |
Christopher Haster |
0:176c74479de2 | 366 | attach(func); |
Christopher Haster |
0:176c74479de2 | 367 | } |
Christopher Haster |
0:176c74479de2 | 368 | |
Christopher Haster |
0:176c74479de2 | 369 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 370 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 371 | */ |
Christopher Haster |
0:176c74479de2 | 372 | void attach(R (*func)(A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 373 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
6:b5f0551273f6 | 374 | _thunk = func ? &FuncPtr::_staticthunk : 0; |
Christopher Haster |
0:176c74479de2 | 375 | } |
Christopher Haster |
0:176c74479de2 | 376 | |
Christopher Haster |
0:176c74479de2 | 377 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 378 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 379 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 380 | */ |
Christopher Haster |
0:176c74479de2 | 381 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 382 | void attach(T *obj, R (*func)(T*, A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 383 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 384 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 385 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 386 | } |
Christopher Haster |
0:176c74479de2 | 387 | |
Christopher Haster |
0:176c74479de2 | 388 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 389 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 390 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 391 | */ |
Christopher Haster |
0:176c74479de2 | 392 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 393 | void attach(T *obj, R (T::*func)(A0, A1)) { |
Christopher Haster |
0:176c74479de2 | 394 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 395 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 396 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 397 | } |
Christopher Haster |
0:176c74479de2 | 398 | |
Christopher Haster |
0:176c74479de2 | 399 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 400 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 401 | */ |
Christopher Haster |
0:176c74479de2 | 402 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 403 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 404 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 405 | } |
Christopher Haster |
0:176c74479de2 | 406 | |
Christopher Haster |
0:176c74479de2 | 407 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 408 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 409 | */ |
Christopher Haster |
0:176c74479de2 | 410 | void attach(const FuncPtr<R(A0, A1)> &func) { |
Christopher Haster |
0:176c74479de2 | 411 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 412 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 413 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 414 | } |
Christopher Haster |
0:176c74479de2 | 415 | |
Christopher Haster |
2:56e1906f7103 | 416 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 417 | */ |
Christopher Haster |
0:176c74479de2 | 418 | R call(A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 419 | return _thunk(_obj, &_func, a0, a1); |
Christopher Haster |
0:176c74479de2 | 420 | } |
Christopher Haster |
0:176c74479de2 | 421 | |
Christopher Haster |
2:56e1906f7103 | 422 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 423 | */ |
Christopher Haster |
0:176c74479de2 | 424 | R operator()(A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 425 | return call(a0, a1); |
Christopher Haster |
0:176c74479de2 | 426 | } |
Christopher Haster |
0:176c74479de2 | 427 | |
Christopher Haster |
0:176c74479de2 | 428 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 429 | */ |
Christopher Haster |
8:71037a47492d | 430 | operator bool() const { |
Christopher Haster |
6:b5f0551273f6 | 431 | return _thunk; |
Christopher Haster |
0:176c74479de2 | 432 | } |
Christopher Haster |
0:176c74479de2 | 433 | |
Christopher Haster |
1:9c28068feddc | 434 | /** Static thunk for passing as C-style function |
Christopher Haster |
2:56e1906f7103 | 435 | * @param func FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 436 | */ |
Christopher Haster |
2:56e1906f7103 | 437 | static R thunk(void *func, A0 a0, A1 a1) { |
Christopher Haster |
2:56e1906f7103 | 438 | return static_cast<FuncPtr<R(A0, A1)>*>(func) |
Christopher Haster |
1:9c28068feddc | 439 | ->call(a0, a1); |
Christopher Haster |
1:9c28068feddc | 440 | } |
Christopher Haster |
1:9c28068feddc | 441 | |
Christopher Haster |
0:176c74479de2 | 442 | private: |
Christopher Haster |
0:176c74479de2 | 443 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 444 | static R _staticthunk(void*, void *func, A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 445 | return (*reinterpret_cast<R (**)(A0, A1)>(func)) |
Christopher Haster |
0:176c74479de2 | 446 | (a0, a1); |
Christopher Haster |
0:176c74479de2 | 447 | } |
Christopher Haster |
0:176c74479de2 | 448 | |
Christopher Haster |
0:176c74479de2 | 449 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 450 | static R _boundthunk(void *obj, void *func, A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 451 | return (*reinterpret_cast<R (**)(T*, A0, A1)>(func)) |
Christopher Haster |
0:176c74479de2 | 452 | (static_cast<T*>(obj), a0, a1); |
Christopher Haster |
0:176c74479de2 | 453 | } |
Christopher Haster |
0:176c74479de2 | 454 | |
Christopher Haster |
0:176c74479de2 | 455 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 456 | static R _methodthunk(void *obj, void *func, A0 a0, A1 a1) { |
Christopher Haster |
0:176c74479de2 | 457 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 458 | (*reinterpret_cast<R (T::**)(A0, A1)>(func))) |
Christopher Haster |
0:176c74479de2 | 459 | (a0, a1); |
Christopher Haster |
0:176c74479de2 | 460 | } |
Christopher Haster |
0:176c74479de2 | 461 | |
Christopher Haster |
0:176c74479de2 | 462 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 463 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 464 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 465 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 466 | struct _class; |
Christopher Haster |
0:176c74479de2 | 467 | union { |
Christopher Haster |
0:176c74479de2 | 468 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 469 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 470 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 471 | } _func; |
Christopher Haster |
0:176c74479de2 | 472 | |
Christopher Haster |
0:176c74479de2 | 473 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 474 | R (*_thunk)(void*, void*, A0, A1); |
Christopher Haster |
0:176c74479de2 | 475 | }; |
Christopher Haster |
0:176c74479de2 | 476 | |
Christopher Haster |
0:176c74479de2 | 477 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 478 | */ |
Christopher Haster |
0:176c74479de2 | 479 | template <typename R, typename A0> |
Christopher Haster |
0:176c74479de2 | 480 | class FuncPtr<R(A0)> { |
Christopher Haster |
0:176c74479de2 | 481 | public: |
Christopher Haster |
0:176c74479de2 | 482 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 483 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 484 | */ |
Christopher Haster |
0:176c74479de2 | 485 | FuncPtr(R (*func)(A0) = 0) { |
Christopher Haster |
0:176c74479de2 | 486 | attach(func); |
Christopher Haster |
0:176c74479de2 | 487 | } |
Christopher Haster |
0:176c74479de2 | 488 | |
Christopher Haster |
0:176c74479de2 | 489 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 490 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 491 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 492 | */ |
Christopher Haster |
0:176c74479de2 | 493 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 494 | FuncPtr(T *obj, R (*func)(T*, A0)) { |
Christopher Haster |
0:176c74479de2 | 495 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 496 | } |
Christopher Haster |
0:176c74479de2 | 497 | |
Christopher Haster |
0:176c74479de2 | 498 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 499 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 500 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 501 | */ |
Christopher Haster |
0:176c74479de2 | 502 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 503 | FuncPtr(T *obj, R (T::*func)(A0)) { |
Christopher Haster |
0:176c74479de2 | 504 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 505 | } |
Christopher Haster |
0:176c74479de2 | 506 | |
Christopher Haster |
0:176c74479de2 | 507 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 508 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 509 | */ |
Christopher Haster |
0:176c74479de2 | 510 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 511 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 512 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 513 | } |
Christopher Haster |
0:176c74479de2 | 514 | |
Christopher Haster |
0:176c74479de2 | 515 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 516 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 517 | */ |
Christopher Haster |
0:176c74479de2 | 518 | FuncPtr(const FuncPtr<R(A0)> &func) { |
Christopher Haster |
0:176c74479de2 | 519 | attach(func); |
Christopher Haster |
0:176c74479de2 | 520 | } |
Christopher Haster |
0:176c74479de2 | 521 | |
Christopher Haster |
0:176c74479de2 | 522 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 523 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 524 | */ |
Christopher Haster |
0:176c74479de2 | 525 | void attach(R (*func)(A0)) { |
Christopher Haster |
0:176c74479de2 | 526 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
6:b5f0551273f6 | 527 | _thunk = func ? &FuncPtr::_staticthunk : 0; |
Christopher Haster |
0:176c74479de2 | 528 | } |
Christopher Haster |
0:176c74479de2 | 529 | |
Christopher Haster |
0:176c74479de2 | 530 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 531 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 532 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 533 | */ |
Christopher Haster |
0:176c74479de2 | 534 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 535 | void attach(T *obj, R (*func)(T*, A0)) { |
Christopher Haster |
0:176c74479de2 | 536 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 537 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 538 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 539 | } |
Christopher Haster |
0:176c74479de2 | 540 | |
Christopher Haster |
0:176c74479de2 | 541 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 542 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 543 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 544 | */ |
Christopher Haster |
0:176c74479de2 | 545 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 546 | void attach(T *obj, R (T::*func)(A0)) { |
Christopher Haster |
0:176c74479de2 | 547 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 548 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 549 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 550 | } |
Christopher Haster |
0:176c74479de2 | 551 | |
Christopher Haster |
0:176c74479de2 | 552 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 553 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 554 | */ |
Christopher Haster |
0:176c74479de2 | 555 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 556 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 557 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 558 | } |
Christopher Haster |
0:176c74479de2 | 559 | |
Christopher Haster |
0:176c74479de2 | 560 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 561 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 562 | */ |
Christopher Haster |
0:176c74479de2 | 563 | void attach(const FuncPtr<R(A0)> &func) { |
Christopher Haster |
0:176c74479de2 | 564 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 565 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 566 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 567 | } |
Christopher Haster |
0:176c74479de2 | 568 | |
Christopher Haster |
2:56e1906f7103 | 569 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 570 | */ |
Christopher Haster |
0:176c74479de2 | 571 | R call(A0 a0) { |
Christopher Haster |
0:176c74479de2 | 572 | return _thunk(_obj, &_func, a0); |
Christopher Haster |
0:176c74479de2 | 573 | } |
Christopher Haster |
0:176c74479de2 | 574 | |
Christopher Haster |
2:56e1906f7103 | 575 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 576 | */ |
Christopher Haster |
0:176c74479de2 | 577 | R operator()(A0 a0) { |
Christopher Haster |
0:176c74479de2 | 578 | return call(a0); |
Christopher Haster |
0:176c74479de2 | 579 | } |
Christopher Haster |
0:176c74479de2 | 580 | |
Christopher Haster |
0:176c74479de2 | 581 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 582 | */ |
Christopher Haster |
8:71037a47492d | 583 | operator bool() const { |
Christopher Haster |
6:b5f0551273f6 | 584 | return _thunk; |
Christopher Haster |
0:176c74479de2 | 585 | } |
Christopher Haster |
0:176c74479de2 | 586 | |
Christopher Haster |
1:9c28068feddc | 587 | /** Static thunk for passing as C-style function |
Christopher Haster |
2:56e1906f7103 | 588 | * @param func FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 589 | */ |
Christopher Haster |
2:56e1906f7103 | 590 | static R thunk(void *func, A0 a0) { |
Christopher Haster |
2:56e1906f7103 | 591 | return static_cast<FuncPtr<R(A0)>*>(func) |
Christopher Haster |
1:9c28068feddc | 592 | ->call(a0); |
Christopher Haster |
1:9c28068feddc | 593 | } |
Christopher Haster |
1:9c28068feddc | 594 | |
Christopher Haster |
0:176c74479de2 | 595 | private: |
Christopher Haster |
0:176c74479de2 | 596 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 597 | static R _staticthunk(void*, void *func, A0 a0) { |
Christopher Haster |
0:176c74479de2 | 598 | return (*reinterpret_cast<R (**)(A0)>(func)) |
Christopher Haster |
0:176c74479de2 | 599 | (a0); |
Christopher Haster |
0:176c74479de2 | 600 | } |
Christopher Haster |
0:176c74479de2 | 601 | |
Christopher Haster |
0:176c74479de2 | 602 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 603 | static R _boundthunk(void *obj, void *func, A0 a0) { |
Christopher Haster |
0:176c74479de2 | 604 | return (*reinterpret_cast<R (**)(T*, A0)>(func)) |
Christopher Haster |
0:176c74479de2 | 605 | (static_cast<T*>(obj), a0); |
Christopher Haster |
0:176c74479de2 | 606 | } |
Christopher Haster |
0:176c74479de2 | 607 | |
Christopher Haster |
0:176c74479de2 | 608 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 609 | static R _methodthunk(void *obj, void *func, A0 a0) { |
Christopher Haster |
0:176c74479de2 | 610 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 611 | (*reinterpret_cast<R (T::**)(A0)>(func))) |
Christopher Haster |
0:176c74479de2 | 612 | (a0); |
Christopher Haster |
0:176c74479de2 | 613 | } |
Christopher Haster |
0:176c74479de2 | 614 | |
Christopher Haster |
0:176c74479de2 | 615 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 616 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 617 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 618 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 619 | struct _class; |
Christopher Haster |
0:176c74479de2 | 620 | union { |
Christopher Haster |
0:176c74479de2 | 621 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 622 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 623 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 624 | } _func; |
Christopher Haster |
0:176c74479de2 | 625 | |
Christopher Haster |
0:176c74479de2 | 626 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 627 | R (*_thunk)(void*, void*, A0); |
Christopher Haster |
0:176c74479de2 | 628 | }; |
Christopher Haster |
0:176c74479de2 | 629 | |
Christopher Haster |
0:176c74479de2 | 630 | /** Flexible templated function class |
Christopher Haster |
0:176c74479de2 | 631 | */ |
Christopher Haster |
0:176c74479de2 | 632 | template <typename R> |
Christopher Haster |
0:176c74479de2 | 633 | class FuncPtr<R()> { |
Christopher Haster |
0:176c74479de2 | 634 | public: |
Christopher Haster |
0:176c74479de2 | 635 | /** Create a FuncPtr with a static function |
Christopher Haster |
0:176c74479de2 | 636 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 637 | */ |
Christopher Haster |
0:176c74479de2 | 638 | FuncPtr(R (*func)() = 0) { |
Christopher Haster |
0:176c74479de2 | 639 | attach(func); |
Christopher Haster |
0:176c74479de2 | 640 | } |
Christopher Haster |
0:176c74479de2 | 641 | |
Christopher Haster |
0:176c74479de2 | 642 | /** Create a FuncPtr with a static function and bound pointer |
Christopher Haster |
0:176c74479de2 | 643 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 644 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 645 | */ |
Christopher Haster |
0:176c74479de2 | 646 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 647 | FuncPtr(T *obj, R (*func)(T*)) { |
Christopher Haster |
0:176c74479de2 | 648 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 649 | } |
Christopher Haster |
0:176c74479de2 | 650 | |
Christopher Haster |
0:176c74479de2 | 651 | /** Create a FuncPtr with a method |
Christopher Haster |
0:176c74479de2 | 652 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 653 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 654 | */ |
Christopher Haster |
0:176c74479de2 | 655 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 656 | FuncPtr(T *obj, R (T::*func)()) { |
Christopher Haster |
0:176c74479de2 | 657 | attach(obj, func); |
Christopher Haster |
0:176c74479de2 | 658 | } |
Christopher Haster |
0:176c74479de2 | 659 | |
Christopher Haster |
0:176c74479de2 | 660 | /** Create a FuncPtr with a function object |
Christopher Haster |
0:176c74479de2 | 661 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 662 | */ |
Christopher Haster |
0:176c74479de2 | 663 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 664 | FuncPtr(T *func) { |
Christopher Haster |
0:176c74479de2 | 665 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 666 | } |
Christopher Haster |
0:176c74479de2 | 667 | |
Christopher Haster |
0:176c74479de2 | 668 | /** Create a FuncPtr with another FuncPtr |
Christopher Haster |
0:176c74479de2 | 669 | * @param func FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 670 | */ |
Christopher Haster |
0:176c74479de2 | 671 | FuncPtr(const FuncPtr<R()> &func) { |
Christopher Haster |
0:176c74479de2 | 672 | attach(func); |
Christopher Haster |
0:176c74479de2 | 673 | } |
Christopher Haster |
0:176c74479de2 | 674 | |
Christopher Haster |
0:176c74479de2 | 675 | /** Attach a static function |
Christopher Haster |
0:176c74479de2 | 676 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 677 | */ |
Christopher Haster |
0:176c74479de2 | 678 | void attach(R (*func)()) { |
Christopher Haster |
0:176c74479de2 | 679 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
6:b5f0551273f6 | 680 | _thunk = func ? &FuncPtr::_staticthunk : 0; |
Christopher Haster |
0:176c74479de2 | 681 | } |
Christopher Haster |
0:176c74479de2 | 682 | |
Christopher Haster |
0:176c74479de2 | 683 | /** Attach a static function with a bound pointer |
Christopher Haster |
0:176c74479de2 | 684 | * @param obj Pointer to object to bind to function |
Christopher Haster |
0:176c74479de2 | 685 | * @param func Static function to attach |
Christopher Haster |
0:176c74479de2 | 686 | */ |
Christopher Haster |
0:176c74479de2 | 687 | template <typename T> |
Christopher Haster |
0:176c74479de2 | 688 | void attach(T *obj, R (*func)(T*)) { |
Christopher Haster |
0:176c74479de2 | 689 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 690 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 691 | _thunk = &FuncPtr::_boundthunk<T>; |
Christopher Haster |
0:176c74479de2 | 692 | } |
Christopher Haster |
0:176c74479de2 | 693 | |
Christopher Haster |
0:176c74479de2 | 694 | /** Attach a method |
Christopher Haster |
0:176c74479de2 | 695 | * @param obj Pointer to object to invoke method on |
Christopher Haster |
0:176c74479de2 | 696 | * @param func Method to attach |
Christopher Haster |
0:176c74479de2 | 697 | */ |
Christopher Haster |
0:176c74479de2 | 698 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 699 | void attach(T *obj, R (T::*func)()) { |
Christopher Haster |
0:176c74479de2 | 700 | _obj = static_cast<void*>(obj); |
Christopher Haster |
0:176c74479de2 | 701 | memcpy(&_func, &func, sizeof func); |
Christopher Haster |
0:176c74479de2 | 702 | _thunk = &FuncPtr::_methodthunk<T>; |
Christopher Haster |
0:176c74479de2 | 703 | } |
Christopher Haster |
0:176c74479de2 | 704 | |
Christopher Haster |
0:176c74479de2 | 705 | /** Attach a function object |
Christopher Haster |
0:176c74479de2 | 706 | * @param func Function object to attach |
Christopher Haster |
0:176c74479de2 | 707 | */ |
Christopher Haster |
0:176c74479de2 | 708 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 709 | void attach(T *func) { |
Christopher Haster |
0:176c74479de2 | 710 | attach(func, &T::operator()); |
Christopher Haster |
0:176c74479de2 | 711 | } |
Christopher Haster |
0:176c74479de2 | 712 | |
Christopher Haster |
0:176c74479de2 | 713 | /** Attach a FuncPtr |
Christopher Haster |
0:176c74479de2 | 714 | * @param func The FuncPtr to attach |
Christopher Haster |
0:176c74479de2 | 715 | */ |
Christopher Haster |
0:176c74479de2 | 716 | void attach(const FuncPtr<R()> &func) { |
Christopher Haster |
0:176c74479de2 | 717 | _obj = func._obj; |
Christopher Haster |
0:176c74479de2 | 718 | memcpy(&_func, &func._func, sizeof _func); |
Christopher Haster |
0:176c74479de2 | 719 | _thunk = func._thunk; |
Christopher Haster |
0:176c74479de2 | 720 | } |
Christopher Haster |
0:176c74479de2 | 721 | |
Christopher Haster |
2:56e1906f7103 | 722 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 723 | */ |
Christopher Haster |
0:176c74479de2 | 724 | R call() { |
Christopher Haster |
0:176c74479de2 | 725 | return _thunk(_obj, &_func); |
Christopher Haster |
0:176c74479de2 | 726 | } |
Christopher Haster |
0:176c74479de2 | 727 | |
Christopher Haster |
2:56e1906f7103 | 728 | /** Call the attached function |
Christopher Haster |
0:176c74479de2 | 729 | */ |
Christopher Haster |
0:176c74479de2 | 730 | R operator()() { |
Christopher Haster |
0:176c74479de2 | 731 | return call(); |
Christopher Haster |
0:176c74479de2 | 732 | } |
Christopher Haster |
0:176c74479de2 | 733 | |
Christopher Haster |
0:176c74479de2 | 734 | /** Test if function has been attached |
Christopher Haster |
0:176c74479de2 | 735 | */ |
Christopher Haster |
8:71037a47492d | 736 | operator bool() const { |
Christopher Haster |
6:b5f0551273f6 | 737 | return _thunk; |
Christopher Haster |
0:176c74479de2 | 738 | } |
Christopher Haster |
0:176c74479de2 | 739 | |
Christopher Haster |
1:9c28068feddc | 740 | /** Static thunk for passing as C-style function |
Christopher Haster |
2:56e1906f7103 | 741 | * @param func FuncPtr to call passed as void pointer |
Christopher Haster |
1:9c28068feddc | 742 | */ |
Christopher Haster |
2:56e1906f7103 | 743 | static R thunk(void *func) { |
Christopher Haster |
2:56e1906f7103 | 744 | return static_cast<FuncPtr<R()>*>(func) |
Christopher Haster |
1:9c28068feddc | 745 | ->call(); |
Christopher Haster |
1:9c28068feddc | 746 | } |
Christopher Haster |
1:9c28068feddc | 747 | |
Christopher Haster |
0:176c74479de2 | 748 | private: |
Christopher Haster |
0:176c74479de2 | 749 | // Internal thunks for various function types |
Christopher Haster |
0:176c74479de2 | 750 | static R _staticthunk(void*, void *func) { |
Christopher Haster |
0:176c74479de2 | 751 | return (*reinterpret_cast<R (**)()>(func)) |
Christopher Haster |
0:176c74479de2 | 752 | (); |
Christopher Haster |
0:176c74479de2 | 753 | } |
Christopher Haster |
0:176c74479de2 | 754 | |
Christopher Haster |
0:176c74479de2 | 755 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 756 | static R _boundthunk(void *obj, void *func) { |
Christopher Haster |
0:176c74479de2 | 757 | return (*reinterpret_cast<R (**)(T*)>(func)) |
Christopher Haster |
0:176c74479de2 | 758 | (static_cast<T*>(obj)); |
Christopher Haster |
0:176c74479de2 | 759 | } |
Christopher Haster |
0:176c74479de2 | 760 | |
Christopher Haster |
0:176c74479de2 | 761 | template<typename T> |
Christopher Haster |
0:176c74479de2 | 762 | static R _methodthunk(void *obj, void *func) { |
Christopher Haster |
0:176c74479de2 | 763 | return (static_cast<T*>(obj)->* |
Christopher Haster |
0:176c74479de2 | 764 | (*reinterpret_cast<R (T::**)()>(func))) |
Christopher Haster |
0:176c74479de2 | 765 | (); |
Christopher Haster |
0:176c74479de2 | 766 | } |
Christopher Haster |
0:176c74479de2 | 767 | |
Christopher Haster |
0:176c74479de2 | 768 | // Stored as pointer to function and pointer to optional object |
Christopher Haster |
0:176c74479de2 | 769 | // Function pointer is stored as union of possible function types |
Christopher Haster |
0:176c74479de2 | 770 | // to garuntee proper size and alignment |
Christopher Haster |
0:176c74479de2 | 771 | void *_obj; |
Christopher Haster |
0:176c74479de2 | 772 | struct _class; |
Christopher Haster |
0:176c74479de2 | 773 | union { |
Christopher Haster |
0:176c74479de2 | 774 | void (*_staticfunc)(); |
Christopher Haster |
0:176c74479de2 | 775 | void (*_boundfunc)(_class *); |
Christopher Haster |
0:176c74479de2 | 776 | void (_class::*_methodfunc)(); |
Christopher Haster |
0:176c74479de2 | 777 | } _func; |
Christopher Haster |
0:176c74479de2 | 778 | |
Christopher Haster |
0:176c74479de2 | 779 | // Thunk registered on attach to dispatch calls |
Christopher Haster |
0:176c74479de2 | 780 | R (*_thunk)(void*, void*); |
Christopher Haster |
0:176c74479de2 | 781 | }; |
Christopher Haster |
0:176c74479de2 | 782 | |
Christopher Haster |
0:176c74479de2 | 783 | |
Christopher Haster |
0:176c74479de2 | 784 | #endif |