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mbed_src_STM32F7/api/FunctionPointer.h@0:aa3fc5ad02f7, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 09:08:29 2019 +0000
Revision:
0:aa3fc5ad02f7
SPKT

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phungductung 0:aa3fc5ad02f7 1 /* mbed Microcontroller Library
phungductung 0:aa3fc5ad02f7 2 * Copyright (c) 2006-2015 ARM Limited
phungductung 0:aa3fc5ad02f7 3 *
phungductung 0:aa3fc5ad02f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:aa3fc5ad02f7 5 * you may not use this file except in compliance with the License.
phungductung 0:aa3fc5ad02f7 6 * You may obtain a copy of the License at
phungductung 0:aa3fc5ad02f7 7 *
phungductung 0:aa3fc5ad02f7 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:aa3fc5ad02f7 9 *
phungductung 0:aa3fc5ad02f7 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:aa3fc5ad02f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:aa3fc5ad02f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:aa3fc5ad02f7 13 * See the License for the specific language governing permissions and
phungductung 0:aa3fc5ad02f7 14 * limitations under the License.
phungductung 0:aa3fc5ad02f7 15 */
phungductung 0:aa3fc5ad02f7 16 #ifndef MBED_FUNCTIONPOINTER_H
phungductung 0:aa3fc5ad02f7 17 #define MBED_FUNCTIONPOINTER_H
phungductung 0:aa3fc5ad02f7 18
phungductung 0:aa3fc5ad02f7 19 #include <string.h>
phungductung 0:aa3fc5ad02f7 20 #include <stdint.h>
phungductung 0:aa3fc5ad02f7 21
phungductung 0:aa3fc5ad02f7 22 namespace mbed {
phungductung 0:aa3fc5ad02f7 23
phungductung 0:aa3fc5ad02f7 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:aa3fc5ad02f7 25
phungductung 0:aa3fc5ad02f7 26 /** A class for storing and calling a pointer to a static or member function
phungductung 0:aa3fc5ad02f7 27 */
phungductung 0:aa3fc5ad02f7 28 template <typename R, typename A1>
phungductung 0:aa3fc5ad02f7 29 class FunctionPointerArg1{
phungductung 0:aa3fc5ad02f7 30 public:
phungductung 0:aa3fc5ad02f7 31 /** Create a FunctionPointer, attaching a static function
phungductung 0:aa3fc5ad02f7 32 *
phungductung 0:aa3fc5ad02f7 33 * @param function The static function to attach (default is none)
phungductung 0:aa3fc5ad02f7 34 */
phungductung 0:aa3fc5ad02f7 35 FunctionPointerArg1(R (*function)(A1) = 0) {
phungductung 0:aa3fc5ad02f7 36 attach(function);
phungductung 0:aa3fc5ad02f7 37 }
phungductung 0:aa3fc5ad02f7 38
phungductung 0:aa3fc5ad02f7 39 /** Create a FunctionPointer, attaching a member function
phungductung 0:aa3fc5ad02f7 40 *
phungductung 0:aa3fc5ad02f7 41 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:aa3fc5ad02f7 42 * @param function The address of the member function to attach
phungductung 0:aa3fc5ad02f7 43 */
phungductung 0:aa3fc5ad02f7 44 template<typename T>
phungductung 0:aa3fc5ad02f7 45 FunctionPointerArg1(T *object, R (T::*member)(A1)) {
phungductung 0:aa3fc5ad02f7 46 attach(object, member);
phungductung 0:aa3fc5ad02f7 47 }
phungductung 0:aa3fc5ad02f7 48
phungductung 0:aa3fc5ad02f7 49 /** Attach a static function
phungductung 0:aa3fc5ad02f7 50 *
phungductung 0:aa3fc5ad02f7 51 * @param function The static function to attach (default is none)
phungductung 0:aa3fc5ad02f7 52 */
phungductung 0:aa3fc5ad02f7 53 void attach(R (*function)(A1)) {
phungductung 0:aa3fc5ad02f7 54 _p.function = function;
phungductung 0:aa3fc5ad02f7 55 _membercaller = 0;
phungductung 0:aa3fc5ad02f7 56 }
phungductung 0:aa3fc5ad02f7 57
phungductung 0:aa3fc5ad02f7 58 /** Attach a member function
phungductung 0:aa3fc5ad02f7 59 *
phungductung 0:aa3fc5ad02f7 60 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:aa3fc5ad02f7 61 * @param function The address of the member function to attach
phungductung 0:aa3fc5ad02f7 62 */
phungductung 0:aa3fc5ad02f7 63 template<typename T>
phungductung 0:aa3fc5ad02f7 64 void attach(T *object, R (T::*member)(A1)) {
phungductung 0:aa3fc5ad02f7 65 _p.object = static_cast<void*>(object);
phungductung 0:aa3fc5ad02f7 66 *reinterpret_cast<R (T::**)(A1)>(_member) = member;
phungductung 0:aa3fc5ad02f7 67 _membercaller = &FunctionPointerArg1::membercaller<T>;
phungductung 0:aa3fc5ad02f7 68 }
phungductung 0:aa3fc5ad02f7 69
phungductung 0:aa3fc5ad02f7 70 /** Call the attached static or member function
phungductung 0:aa3fc5ad02f7 71 */
phungductung 0:aa3fc5ad02f7 72 R call(A1 a) {
phungductung 0:aa3fc5ad02f7 73 if (_membercaller == 0 && _p.function) {
phungductung 0:aa3fc5ad02f7 74 return _p.function(a);
phungductung 0:aa3fc5ad02f7 75 } else if (_membercaller && _p.object) {
phungductung 0:aa3fc5ad02f7 76 return _membercaller(_p.object, _member, a);
phungductung 0:aa3fc5ad02f7 77 }
phungductung 0:aa3fc5ad02f7 78 return (R)0;
phungductung 0:aa3fc5ad02f7 79 }
phungductung 0:aa3fc5ad02f7 80
phungductung 0:aa3fc5ad02f7 81 /** Get registered static function
phungductung 0:aa3fc5ad02f7 82 */
phungductung 0:aa3fc5ad02f7 83 R(*get_function(A1))() {
phungductung 0:aa3fc5ad02f7 84 return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function;
phungductung 0:aa3fc5ad02f7 85 }
phungductung 0:aa3fc5ad02f7 86
phungductung 0:aa3fc5ad02f7 87 #ifdef MBED_OPERATORS
phungductung 0:aa3fc5ad02f7 88 R operator ()(A1 a) {
phungductung 0:aa3fc5ad02f7 89 return call(a);
phungductung 0:aa3fc5ad02f7 90 }
phungductung 0:aa3fc5ad02f7 91 operator bool(void) const {
phungductung 0:aa3fc5ad02f7 92 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
phungductung 0:aa3fc5ad02f7 93 }
phungductung 0:aa3fc5ad02f7 94 #endif
phungductung 0:aa3fc5ad02f7 95 private:
phungductung 0:aa3fc5ad02f7 96 template<typename T>
phungductung 0:aa3fc5ad02f7 97 static R membercaller(void *object, uintptr_t *member, A1 a) {
phungductung 0:aa3fc5ad02f7 98 T* o = static_cast<T*>(object);
phungductung 0:aa3fc5ad02f7 99 R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
phungductung 0:aa3fc5ad02f7 100 return (o->**m)(a);
phungductung 0:aa3fc5ad02f7 101 }
phungductung 0:aa3fc5ad02f7 102
phungductung 0:aa3fc5ad02f7 103 union {
phungductung 0:aa3fc5ad02f7 104 R (*function)(A1); // static function pointer
phungductung 0:aa3fc5ad02f7 105 void *object; // object this pointer
phungductung 0:aa3fc5ad02f7 106 } _p;
phungductung 0:aa3fc5ad02f7 107 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
phungductung 0:aa3fc5ad02f7 108 R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
phungductung 0:aa3fc5ad02f7 109 };
phungductung 0:aa3fc5ad02f7 110
phungductung 0:aa3fc5ad02f7 111 /** A class for storing and calling a pointer to a static or member function (R ()(void))
phungductung 0:aa3fc5ad02f7 112 */
phungductung 0:aa3fc5ad02f7 113 template <typename R>
phungductung 0:aa3fc5ad02f7 114 class FunctionPointerArg1<R, void>{
phungductung 0:aa3fc5ad02f7 115 public:
phungductung 0:aa3fc5ad02f7 116 /** Create a FunctionPointer, attaching a static function
phungductung 0:aa3fc5ad02f7 117 *
phungductung 0:aa3fc5ad02f7 118 * @param function The static function to attach (default is none)
phungductung 0:aa3fc5ad02f7 119 */
phungductung 0:aa3fc5ad02f7 120 FunctionPointerArg1(R (*function)(void) = 0) {
phungductung 0:aa3fc5ad02f7 121 attach(function);
phungductung 0:aa3fc5ad02f7 122 }
phungductung 0:aa3fc5ad02f7 123
phungductung 0:aa3fc5ad02f7 124 /** Create a FunctionPointer, attaching a member function
phungductung 0:aa3fc5ad02f7 125 *
phungductung 0:aa3fc5ad02f7 126 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:aa3fc5ad02f7 127 * @param function The address of the void member function to attach
phungductung 0:aa3fc5ad02f7 128 */
phungductung 0:aa3fc5ad02f7 129 template<typename T>
phungductung 0:aa3fc5ad02f7 130 FunctionPointerArg1(T *object, R (T::*member)(void)) {
phungductung 0:aa3fc5ad02f7 131 attach(object, member);
phungductung 0:aa3fc5ad02f7 132 }
phungductung 0:aa3fc5ad02f7 133
phungductung 0:aa3fc5ad02f7 134 /** Attach a static function
phungductung 0:aa3fc5ad02f7 135 *
phungductung 0:aa3fc5ad02f7 136 * @param function The void static function to attach (default is none)
phungductung 0:aa3fc5ad02f7 137 */
phungductung 0:aa3fc5ad02f7 138 void attach(R (*function)(void)) {
phungductung 0:aa3fc5ad02f7 139 _p.function = function;
phungductung 0:aa3fc5ad02f7 140 _membercaller = 0;
phungductung 0:aa3fc5ad02f7 141 }
phungductung 0:aa3fc5ad02f7 142
phungductung 0:aa3fc5ad02f7 143 /** Attach a member function
phungductung 0:aa3fc5ad02f7 144 *
phungductung 0:aa3fc5ad02f7 145 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:aa3fc5ad02f7 146 * @param function The address of the void member function to attach
phungductung 0:aa3fc5ad02f7 147 */
phungductung 0:aa3fc5ad02f7 148 template<typename T>
phungductung 0:aa3fc5ad02f7 149 void attach(T *object, R (T::*member)(void)) {
phungductung 0:aa3fc5ad02f7 150 _p.object = static_cast<void*>(object);
phungductung 0:aa3fc5ad02f7 151 *reinterpret_cast<R (T::**)(void)>(_member) = member;
phungductung 0:aa3fc5ad02f7 152 _membercaller = &FunctionPointerArg1::membercaller<T>;
phungductung 0:aa3fc5ad02f7 153 }
phungductung 0:aa3fc5ad02f7 154
phungductung 0:aa3fc5ad02f7 155 /** Call the attached static or member function
phungductung 0:aa3fc5ad02f7 156 */
phungductung 0:aa3fc5ad02f7 157 R call(){
phungductung 0:aa3fc5ad02f7 158 if (_membercaller == 0 && _p.function) {
phungductung 0:aa3fc5ad02f7 159 return _p.function();
phungductung 0:aa3fc5ad02f7 160 } else if (_membercaller && _p.object) {
phungductung 0:aa3fc5ad02f7 161 return _membercaller(_p.object, _member);
phungductung 0:aa3fc5ad02f7 162 }
phungductung 0:aa3fc5ad02f7 163 return (R)0;
phungductung 0:aa3fc5ad02f7 164 }
phungductung 0:aa3fc5ad02f7 165
phungductung 0:aa3fc5ad02f7 166 /** Get registered static function
phungductung 0:aa3fc5ad02f7 167 */
phungductung 0:aa3fc5ad02f7 168 R(*get_function())() {
phungductung 0:aa3fc5ad02f7 169 return _membercaller ? (R(*)())0 : (R(*)())_p.function;
phungductung 0:aa3fc5ad02f7 170 }
phungductung 0:aa3fc5ad02f7 171
phungductung 0:aa3fc5ad02f7 172 #ifdef MBED_OPERATORS
phungductung 0:aa3fc5ad02f7 173 R operator ()(void) {
phungductung 0:aa3fc5ad02f7 174 return call();
phungductung 0:aa3fc5ad02f7 175 }
phungductung 0:aa3fc5ad02f7 176 operator bool(void) const {
phungductung 0:aa3fc5ad02f7 177 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
phungductung 0:aa3fc5ad02f7 178 }
phungductung 0:aa3fc5ad02f7 179 #endif
phungductung 0:aa3fc5ad02f7 180
phungductung 0:aa3fc5ad02f7 181 private:
phungductung 0:aa3fc5ad02f7 182 template<typename T>
phungductung 0:aa3fc5ad02f7 183 static R membercaller(void *object, uintptr_t *member) {
phungductung 0:aa3fc5ad02f7 184 T* o = static_cast<T*>(object);
phungductung 0:aa3fc5ad02f7 185 R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
phungductung 0:aa3fc5ad02f7 186 return (o->**m)();
phungductung 0:aa3fc5ad02f7 187 }
phungductung 0:aa3fc5ad02f7 188
phungductung 0:aa3fc5ad02f7 189 union {
phungductung 0:aa3fc5ad02f7 190 R (*function)(void); // static function pointer
phungductung 0:aa3fc5ad02f7 191 void *object; // object this pointer
phungductung 0:aa3fc5ad02f7 192 } _p;
phungductung 0:aa3fc5ad02f7 193 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
phungductung 0:aa3fc5ad02f7 194 R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
phungductung 0:aa3fc5ad02f7 195 };
phungductung 0:aa3fc5ad02f7 196
phungductung 0:aa3fc5ad02f7 197 typedef FunctionPointerArg1<void, void> FunctionPointer;
phungductung 0:aa3fc5ad02f7 198 typedef FunctionPointerArg1<void, int> event_callback_t;
phungductung 0:aa3fc5ad02f7 199
phungductung 0:aa3fc5ad02f7 200 } // namespace mbed
phungductung 0:aa3fc5ad02f7 201
phungductung 0:aa3fc5ad02f7 202 #endif