PHung Tung / SRC_STM32F7

SPKT

Dependents:   WAV

api/FunctionPointer.h@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 * Copyright (c) 2006-2015 ARM Limited
phungductung 0:e87aa4c49e95 3 *
phungductung 0:e87aa4c49e95 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:e87aa4c49e95 5 * you may not use this file except in compliance with the License.
phungductung 0:e87aa4c49e95 6 * You may obtain a copy of the License at
phungductung 0:e87aa4c49e95 7 *
phungductung 0:e87aa4c49e95 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:e87aa4c49e95 9 *
phungductung 0:e87aa4c49e95 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:e87aa4c49e95 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:e87aa4c49e95 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:e87aa4c49e95 13 * See the License for the specific language governing permissions and
phungductung 0:e87aa4c49e95 14 * limitations under the License.
phungductung 0:e87aa4c49e95 15 */
phungductung 0:e87aa4c49e95 16 #ifndef MBED_FUNCTIONPOINTER_H
phungductung 0:e87aa4c49e95 17 #define MBED_FUNCTIONPOINTER_H
phungductung 0:e87aa4c49e95 18
phungductung 0:e87aa4c49e95 19 #include <string.h>
phungductung 0:e87aa4c49e95 20 #include <stdint.h>
phungductung 0:e87aa4c49e95 21
phungductung 0:e87aa4c49e95 22 namespace mbed {
phungductung 0:e87aa4c49e95 23
phungductung 0:e87aa4c49e95 24 /* If we had variaditic templates, this wouldn't be a problem, but until C++11 is enabled, we are stuck with multiple classes... */
phungductung 0:e87aa4c49e95 25
phungductung 0:e87aa4c49e95 26 /** A class for storing and calling a pointer to a static or member function
phungductung 0:e87aa4c49e95 27 */
phungductung 0:e87aa4c49e95 28 template <typename R, typename A1>
phungductung 0:e87aa4c49e95 29 class FunctionPointerArg1{
phungductung 0:e87aa4c49e95 30 public:
phungductung 0:e87aa4c49e95 31 /** Create a FunctionPointer, attaching a static function
phungductung 0:e87aa4c49e95 32 *
phungductung 0:e87aa4c49e95 33 * @param function The static function to attach (default is none)
phungductung 0:e87aa4c49e95 34 */
phungductung 0:e87aa4c49e95 35 FunctionPointerArg1(R (*function)(A1) = 0) {
phungductung 0:e87aa4c49e95 36 attach(function);
phungductung 0:e87aa4c49e95 37 }
phungductung 0:e87aa4c49e95 38
phungductung 0:e87aa4c49e95 39 /** Create a FunctionPointer, attaching a member function
phungductung 0:e87aa4c49e95 40 *
phungductung 0:e87aa4c49e95 41 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:e87aa4c49e95 42 * @param function The address of the member function to attach
phungductung 0:e87aa4c49e95 43 */
phungductung 0:e87aa4c49e95 44 template<typename T>
phungductung 0:e87aa4c49e95 45 FunctionPointerArg1(T *object, R (T::*member)(A1)) {
phungductung 0:e87aa4c49e95 46 attach(object, member);
phungductung 0:e87aa4c49e95 47 }
phungductung 0:e87aa4c49e95 48
phungductung 0:e87aa4c49e95 49 /** Attach a static function
phungductung 0:e87aa4c49e95 50 *
phungductung 0:e87aa4c49e95 51 * @param function The static function to attach (default is none)
phungductung 0:e87aa4c49e95 52 */
phungductung 0:e87aa4c49e95 53 void attach(R (*function)(A1)) {
phungductung 0:e87aa4c49e95 54 _p.function = function;
phungductung 0:e87aa4c49e95 55 _membercaller = 0;
phungductung 0:e87aa4c49e95 56 }
phungductung 0:e87aa4c49e95 57
phungductung 0:e87aa4c49e95 58 /** Attach a member function
phungductung 0:e87aa4c49e95 59 *
phungductung 0:e87aa4c49e95 60 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:e87aa4c49e95 61 * @param function The address of the member function to attach
phungductung 0:e87aa4c49e95 62 */
phungductung 0:e87aa4c49e95 63 template<typename T>
phungductung 0:e87aa4c49e95 64 void attach(T *object, R (T::*member)(A1)) {
phungductung 0:e87aa4c49e95 65 _p.object = static_cast<void*>(object);
phungductung 0:e87aa4c49e95 66 *reinterpret_cast<R (T::**)(A1)>(_member) = member;
phungductung 0:e87aa4c49e95 67 _membercaller = &FunctionPointerArg1::membercaller<T>;
phungductung 0:e87aa4c49e95 68 }
phungductung 0:e87aa4c49e95 69
phungductung 0:e87aa4c49e95 70 /** Call the attached static or member function
phungductung 0:e87aa4c49e95 71 */
phungductung 0:e87aa4c49e95 72 R call(A1 a) {
phungductung 0:e87aa4c49e95 73 if (_membercaller == 0 && _p.function) {
phungductung 0:e87aa4c49e95 74 return _p.function(a);
phungductung 0:e87aa4c49e95 75 } else if (_membercaller && _p.object) {
phungductung 0:e87aa4c49e95 76 return _membercaller(_p.object, _member, a);
phungductung 0:e87aa4c49e95 77 }
phungductung 0:e87aa4c49e95 78 return (R)0;
phungductung 0:e87aa4c49e95 79 }
phungductung 0:e87aa4c49e95 80
phungductung 0:e87aa4c49e95 81 /** Get registered static function
phungductung 0:e87aa4c49e95 82 */
phungductung 0:e87aa4c49e95 83 R(*get_function(A1))() {
phungductung 0:e87aa4c49e95 84 return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function;
phungductung 0:e87aa4c49e95 85 }
phungductung 0:e87aa4c49e95 86
phungductung 0:e87aa4c49e95 87 #ifdef MBED_OPERATORS
phungductung 0:e87aa4c49e95 88 R operator ()(A1 a) {
phungductung 0:e87aa4c49e95 89 return call(a);
phungductung 0:e87aa4c49e95 90 }
phungductung 0:e87aa4c49e95 91 operator bool(void) const {
phungductung 0:e87aa4c49e95 92 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
phungductung 0:e87aa4c49e95 93 }
phungductung 0:e87aa4c49e95 94 #endif
phungductung 0:e87aa4c49e95 95 private:
phungductung 0:e87aa4c49e95 96 template<typename T>
phungductung 0:e87aa4c49e95 97 static R membercaller(void *object, uintptr_t *member, A1 a) {
phungductung 0:e87aa4c49e95 98 T* o = static_cast<T*>(object);
phungductung 0:e87aa4c49e95 99 R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
phungductung 0:e87aa4c49e95 100 return (o->**m)(a);
phungductung 0:e87aa4c49e95 101 }
phungductung 0:e87aa4c49e95 102
phungductung 0:e87aa4c49e95 103 union {
phungductung 0:e87aa4c49e95 104 R (*function)(A1); // static function pointer
phungductung 0:e87aa4c49e95 105 void *object; // object this pointer
phungductung 0:e87aa4c49e95 106 } _p;
phungductung 0:e87aa4c49e95 107 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
phungductung 0:e87aa4c49e95 108 R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
phungductung 0:e87aa4c49e95 109 };
phungductung 0:e87aa4c49e95 110
phungductung 0:e87aa4c49e95 111 /** A class for storing and calling a pointer to a static or member function (R ()(void))
phungductung 0:e87aa4c49e95 112 */
phungductung 0:e87aa4c49e95 113 template <typename R>
phungductung 0:e87aa4c49e95 114 class FunctionPointerArg1<R, void>{
phungductung 0:e87aa4c49e95 115 public:
phungductung 0:e87aa4c49e95 116 /** Create a FunctionPointer, attaching a static function
phungductung 0:e87aa4c49e95 117 *
phungductung 0:e87aa4c49e95 118 * @param function The static function to attach (default is none)
phungductung 0:e87aa4c49e95 119 */
phungductung 0:e87aa4c49e95 120 FunctionPointerArg1(R (*function)(void) = 0) {
phungductung 0:e87aa4c49e95 121 attach(function);
phungductung 0:e87aa4c49e95 122 }
phungductung 0:e87aa4c49e95 123
phungductung 0:e87aa4c49e95 124 /** Create a FunctionPointer, attaching a member function
phungductung 0:e87aa4c49e95 125 *
phungductung 0:e87aa4c49e95 126 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:e87aa4c49e95 127 * @param function The address of the void member function to attach
phungductung 0:e87aa4c49e95 128 */
phungductung 0:e87aa4c49e95 129 template<typename T>
phungductung 0:e87aa4c49e95 130 FunctionPointerArg1(T *object, R (T::*member)(void)) {
phungductung 0:e87aa4c49e95 131 attach(object, member);
phungductung 0:e87aa4c49e95 132 }
phungductung 0:e87aa4c49e95 133
phungductung 0:e87aa4c49e95 134 /** Attach a static function
phungductung 0:e87aa4c49e95 135 *
phungductung 0:e87aa4c49e95 136 * @param function The void static function to attach (default is none)
phungductung 0:e87aa4c49e95 137 */
phungductung 0:e87aa4c49e95 138 void attach(R (*function)(void)) {
phungductung 0:e87aa4c49e95 139 _p.function = function;
phungductung 0:e87aa4c49e95 140 _membercaller = 0;
phungductung 0:e87aa4c49e95 141 }
phungductung 0:e87aa4c49e95 142
phungductung 0:e87aa4c49e95 143 /** Attach a member function
phungductung 0:e87aa4c49e95 144 *
phungductung 0:e87aa4c49e95 145 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:e87aa4c49e95 146 * @param function The address of the void member function to attach
phungductung 0:e87aa4c49e95 147 */
phungductung 0:e87aa4c49e95 148 template<typename T>
phungductung 0:e87aa4c49e95 149 void attach(T *object, R (T::*member)(void)) {
phungductung 0:e87aa4c49e95 150 _p.object = static_cast<void*>(object);
phungductung 0:e87aa4c49e95 151 *reinterpret_cast<R (T::**)(void)>(_member) = member;
phungductung 0:e87aa4c49e95 152 _membercaller = &FunctionPointerArg1::membercaller<T>;
phungductung 0:e87aa4c49e95 153 }
phungductung 0:e87aa4c49e95 154
phungductung 0:e87aa4c49e95 155 /** Call the attached static or member function
phungductung 0:e87aa4c49e95 156 */
phungductung 0:e87aa4c49e95 157 R call(){
phungductung 0:e87aa4c49e95 158 if (_membercaller == 0 && _p.function) {
phungductung 0:e87aa4c49e95 159 return _p.function();
phungductung 0:e87aa4c49e95 160 } else if (_membercaller && _p.object) {
phungductung 0:e87aa4c49e95 161 return _membercaller(_p.object, _member);
phungductung 0:e87aa4c49e95 162 }
phungductung 0:e87aa4c49e95 163 return (R)0;
phungductung 0:e87aa4c49e95 164 }
phungductung 0:e87aa4c49e95 165
phungductung 0:e87aa4c49e95 166 /** Get registered static function
phungductung 0:e87aa4c49e95 167 */
phungductung 0:e87aa4c49e95 168 R(*get_function())() {
phungductung 0:e87aa4c49e95 169 return _membercaller ? (R(*)())0 : (R(*)())_p.function;
phungductung 0:e87aa4c49e95 170 }
phungductung 0:e87aa4c49e95 171
phungductung 0:e87aa4c49e95 172 #ifdef MBED_OPERATORS
phungductung 0:e87aa4c49e95 173 R operator ()(void) {
phungductung 0:e87aa4c49e95 174 return call();
phungductung 0:e87aa4c49e95 175 }
phungductung 0:e87aa4c49e95 176 operator bool(void) const {
phungductung 0:e87aa4c49e95 177 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
phungductung 0:e87aa4c49e95 178 }
phungductung 0:e87aa4c49e95 179 #endif
phungductung 0:e87aa4c49e95 180
phungductung 0:e87aa4c49e95 181 private:
phungductung 0:e87aa4c49e95 182 template<typename T>
phungductung 0:e87aa4c49e95 183 static R membercaller(void *object, uintptr_t *member) {
phungductung 0:e87aa4c49e95 184 T* o = static_cast<T*>(object);
phungductung 0:e87aa4c49e95 185 R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
phungductung 0:e87aa4c49e95 186 return (o->**m)();
phungductung 0:e87aa4c49e95 187 }
phungductung 0:e87aa4c49e95 188
phungductung 0:e87aa4c49e95 189 union {
phungductung 0:e87aa4c49e95 190 R (*function)(void); // static function pointer
phungductung 0:e87aa4c49e95 191 void *object; // object this pointer
phungductung 0:e87aa4c49e95 192 } _p;
phungductung 0:e87aa4c49e95 193 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
phungductung 0:e87aa4c49e95 194 R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
phungductung 0:e87aa4c49e95 195 };
phungductung 0:e87aa4c49e95 196
phungductung 0:e87aa4c49e95 197 typedef FunctionPointerArg1<void, void> FunctionPointer;
phungductung 0:e87aa4c49e95 198 typedef FunctionPointerArg1<void, int> event_callback_t;
phungductung 0:e87aa4c49e95 199
phungductung 0:e87aa4c49e95 200 } // namespace mbed
phungductung 0:e87aa4c49e95 201
phungductung 0:e87aa4c49e95 202 #endif