PHung Tung / DISCO-F746_WAV_PLAYER

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Dependencies:   F746_GUI SD_PlayerSkeleton F746_SAI_IO

SRC_STM32F7/api/FunctionPointer.h@0:8ede47d38d10, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:37:21 2019 +0000
Revision:
0:8ede47d38d10
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phungductung 0:8ede47d38d10 1 /* mbed Microcontroller Library
phungductung 0:8ede47d38d10 2 * Copyright (c) 2006-2015 ARM Limited
phungductung 0:8ede47d38d10 3 *
phungductung 0:8ede47d38d10 4 * Licensed under the Apache License, Version 2.0 (the "License");
phungductung 0:8ede47d38d10 5 * you may not use this file except in compliance with the License.
phungductung 0:8ede47d38d10 6 * You may obtain a copy of the License at
phungductung 0:8ede47d38d10 7 *
phungductung 0:8ede47d38d10 8 * http://www.apache.org/licenses/LICENSE-2.0
phungductung 0:8ede47d38d10 9 *
phungductung 0:8ede47d38d10 10 * Unless required by applicable law or agreed to in writing, software
phungductung 0:8ede47d38d10 11 * distributed under the License is distributed on an "AS IS" BASIS,
phungductung 0:8ede47d38d10 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
phungductung 0:8ede47d38d10 13 * See the License for the specific language governing permissions and
phungductung 0:8ede47d38d10 14 * limitations under the License.
phungductung 0:8ede47d38d10 15 */
phungductung 0:8ede47d38d10 16 #ifndef MBED_FUNCTIONPOINTER_H
phungductung 0:8ede47d38d10 17 #define MBED_FUNCTIONPOINTER_H
phungductung 0:8ede47d38d10 18
phungductung 0:8ede47d38d10 19 #include <string.h>
phungductung 0:8ede47d38d10 20 #include <stdint.h>
phungductung 0:8ede47d38d10 21
phungductung 0:8ede47d38d10 22 namespace mbed {
phungductung 0:8ede47d38d10 23
phungductung 0:8ede47d38d10 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 0:8ede47d38d10 25
phungductung 0:8ede47d38d10 26 /** A class for storing and calling a pointer to a static or member function
phungductung 0:8ede47d38d10 27 */
phungductung 0:8ede47d38d10 28 template <typename R, typename A1>
phungductung 0:8ede47d38d10 29 class FunctionPointerArg1{
phungductung 0:8ede47d38d10 30 public:
phungductung 0:8ede47d38d10 31 /** Create a FunctionPointer, attaching a static function
phungductung 0:8ede47d38d10 32 *
phungductung 0:8ede47d38d10 33 * @param function The static function to attach (default is none)
phungductung 0:8ede47d38d10 34 */
phungductung 0:8ede47d38d10 35 FunctionPointerArg1(R (*function)(A1) = 0) {
phungductung 0:8ede47d38d10 36 attach(function);
phungductung 0:8ede47d38d10 37 }
phungductung 0:8ede47d38d10 38
phungductung 0:8ede47d38d10 39 /** Create a FunctionPointer, attaching a member function
phungductung 0:8ede47d38d10 40 *
phungductung 0:8ede47d38d10 41 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:8ede47d38d10 42 * @param function The address of the member function to attach
phungductung 0:8ede47d38d10 43 */
phungductung 0:8ede47d38d10 44 template<typename T>
phungductung 0:8ede47d38d10 45 FunctionPointerArg1(T *object, R (T::*member)(A1)) {
phungductung 0:8ede47d38d10 46 attach(object, member);
phungductung 0:8ede47d38d10 47 }
phungductung 0:8ede47d38d10 48
phungductung 0:8ede47d38d10 49 /** Attach a static function
phungductung 0:8ede47d38d10 50 *
phungductung 0:8ede47d38d10 51 * @param function The static function to attach (default is none)
phungductung 0:8ede47d38d10 52 */
phungductung 0:8ede47d38d10 53 void attach(R (*function)(A1)) {
phungductung 0:8ede47d38d10 54 _p.function = function;
phungductung 0:8ede47d38d10 55 _membercaller = 0;
phungductung 0:8ede47d38d10 56 }
phungductung 0:8ede47d38d10 57
phungductung 0:8ede47d38d10 58 /** Attach a member function
phungductung 0:8ede47d38d10 59 *
phungductung 0:8ede47d38d10 60 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:8ede47d38d10 61 * @param function The address of the member function to attach
phungductung 0:8ede47d38d10 62 */
phungductung 0:8ede47d38d10 63 template<typename T>
phungductung 0:8ede47d38d10 64 void attach(T *object, R (T::*member)(A1)) {
phungductung 0:8ede47d38d10 65 _p.object = static_cast<void*>(object);
phungductung 0:8ede47d38d10 66 *reinterpret_cast<R (T::**)(A1)>(_member) = member;
phungductung 0:8ede47d38d10 67 _membercaller = &FunctionPointerArg1::membercaller<T>;
phungductung 0:8ede47d38d10 68 }
phungductung 0:8ede47d38d10 69
phungductung 0:8ede47d38d10 70 /** Call the attached static or member function
phungductung 0:8ede47d38d10 71 */
phungductung 0:8ede47d38d10 72 R call(A1 a) {
phungductung 0:8ede47d38d10 73 if (_membercaller == 0 && _p.function) {
phungductung 0:8ede47d38d10 74 return _p.function(a);
phungductung 0:8ede47d38d10 75 } else if (_membercaller && _p.object) {
phungductung 0:8ede47d38d10 76 return _membercaller(_p.object, _member, a);
phungductung 0:8ede47d38d10 77 }
phungductung 0:8ede47d38d10 78 return (R)0;
phungductung 0:8ede47d38d10 79 }
phungductung 0:8ede47d38d10 80
phungductung 0:8ede47d38d10 81 /** Get registered static function
phungductung 0:8ede47d38d10 82 */
phungductung 0:8ede47d38d10 83 R(*get_function(A1))() {
phungductung 0:8ede47d38d10 84 return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function;
phungductung 0:8ede47d38d10 85 }
phungductung 0:8ede47d38d10 86
phungductung 0:8ede47d38d10 87 #ifdef MBED_OPERATORS
phungductung 0:8ede47d38d10 88 R operator ()(A1 a) {
phungductung 0:8ede47d38d10 89 return call(a);
phungductung 0:8ede47d38d10 90 }
phungductung 0:8ede47d38d10 91 operator bool(void) const {
phungductung 0:8ede47d38d10 92 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
phungductung 0:8ede47d38d10 93 }
phungductung 0:8ede47d38d10 94 #endif
phungductung 0:8ede47d38d10 95 private:
phungductung 0:8ede47d38d10 96 template<typename T>
phungductung 0:8ede47d38d10 97 static R membercaller(void *object, uintptr_t *member, A1 a) {
phungductung 0:8ede47d38d10 98 T* o = static_cast<T*>(object);
phungductung 0:8ede47d38d10 99 R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
phungductung 0:8ede47d38d10 100 return (o->**m)(a);
phungductung 0:8ede47d38d10 101 }
phungductung 0:8ede47d38d10 102
phungductung 0:8ede47d38d10 103 union {
phungductung 0:8ede47d38d10 104 R (*function)(A1); // static function pointer
phungductung 0:8ede47d38d10 105 void *object; // object this pointer
phungductung 0:8ede47d38d10 106 } _p;
phungductung 0:8ede47d38d10 107 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
phungductung 0:8ede47d38d10 108 R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
phungductung 0:8ede47d38d10 109 };
phungductung 0:8ede47d38d10 110
phungductung 0:8ede47d38d10 111 /** A class for storing and calling a pointer to a static or member function (R ()(void))
phungductung 0:8ede47d38d10 112 */
phungductung 0:8ede47d38d10 113 template <typename R>
phungductung 0:8ede47d38d10 114 class FunctionPointerArg1<R, void>{
phungductung 0:8ede47d38d10 115 public:
phungductung 0:8ede47d38d10 116 /** Create a FunctionPointer, attaching a static function
phungductung 0:8ede47d38d10 117 *
phungductung 0:8ede47d38d10 118 * @param function The static function to attach (default is none)
phungductung 0:8ede47d38d10 119 */
phungductung 0:8ede47d38d10 120 FunctionPointerArg1(R (*function)(void) = 0) {
phungductung 0:8ede47d38d10 121 attach(function);
phungductung 0:8ede47d38d10 122 }
phungductung 0:8ede47d38d10 123
phungductung 0:8ede47d38d10 124 /** Create a FunctionPointer, attaching a member function
phungductung 0:8ede47d38d10 125 *
phungductung 0:8ede47d38d10 126 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:8ede47d38d10 127 * @param function The address of the void member function to attach
phungductung 0:8ede47d38d10 128 */
phungductung 0:8ede47d38d10 129 template<typename T>
phungductung 0:8ede47d38d10 130 FunctionPointerArg1(T *object, R (T::*member)(void)) {
phungductung 0:8ede47d38d10 131 attach(object, member);
phungductung 0:8ede47d38d10 132 }
phungductung 0:8ede47d38d10 133
phungductung 0:8ede47d38d10 134 /** Attach a static function
phungductung 0:8ede47d38d10 135 *
phungductung 0:8ede47d38d10 136 * @param function The void static function to attach (default is none)
phungductung 0:8ede47d38d10 137 */
phungductung 0:8ede47d38d10 138 void attach(R (*function)(void)) {
phungductung 0:8ede47d38d10 139 _p.function = function;
phungductung 0:8ede47d38d10 140 _membercaller = 0;
phungductung 0:8ede47d38d10 141 }
phungductung 0:8ede47d38d10 142
phungductung 0:8ede47d38d10 143 /** Attach a member function
phungductung 0:8ede47d38d10 144 *
phungductung 0:8ede47d38d10 145 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
phungductung 0:8ede47d38d10 146 * @param function The address of the void member function to attach
phungductung 0:8ede47d38d10 147 */
phungductung 0:8ede47d38d10 148 template<typename T>
phungductung 0:8ede47d38d10 149 void attach(T *object, R (T::*member)(void)) {
phungductung 0:8ede47d38d10 150 _p.object = static_cast<void*>(object);
phungductung 0:8ede47d38d10 151 *reinterpret_cast<R (T::**)(void)>(_member) = member;
phungductung 0:8ede47d38d10 152 _membercaller = &FunctionPointerArg1::membercaller<T>;
phungductung 0:8ede47d38d10 153 }
phungductung 0:8ede47d38d10 154
phungductung 0:8ede47d38d10 155 /** Call the attached static or member function
phungductung 0:8ede47d38d10 156 */
phungductung 0:8ede47d38d10 157 R call(){
phungductung 0:8ede47d38d10 158 if (_membercaller == 0 && _p.function) {
phungductung 0:8ede47d38d10 159 return _p.function();
phungductung 0:8ede47d38d10 160 } else if (_membercaller && _p.object) {
phungductung 0:8ede47d38d10 161 return _membercaller(_p.object, _member);
phungductung 0:8ede47d38d10 162 }
phungductung 0:8ede47d38d10 163 return (R)0;
phungductung 0:8ede47d38d10 164 }
phungductung 0:8ede47d38d10 165
phungductung 0:8ede47d38d10 166 /** Get registered static function
phungductung 0:8ede47d38d10 167 */
phungductung 0:8ede47d38d10 168 R(*get_function())() {
phungductung 0:8ede47d38d10 169 return _membercaller ? (R(*)())0 : (R(*)())_p.function;
phungductung 0:8ede47d38d10 170 }
phungductung 0:8ede47d38d10 171
phungductung 0:8ede47d38d10 172 #ifdef MBED_OPERATORS
phungductung 0:8ede47d38d10 173 R operator ()(void) {
phungductung 0:8ede47d38d10 174 return call();
phungductung 0:8ede47d38d10 175 }
phungductung 0:8ede47d38d10 176 operator bool(void) const {
phungductung 0:8ede47d38d10 177 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
phungductung 0:8ede47d38d10 178 }
phungductung 0:8ede47d38d10 179 #endif
phungductung 0:8ede47d38d10 180
phungductung 0:8ede47d38d10 181 private:
phungductung 0:8ede47d38d10 182 template<typename T>
phungductung 0:8ede47d38d10 183 static R membercaller(void *object, uintptr_t *member) {
phungductung 0:8ede47d38d10 184 T* o = static_cast<T*>(object);
phungductung 0:8ede47d38d10 185 R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
phungductung 0:8ede47d38d10 186 return (o->**m)();
phungductung 0:8ede47d38d10 187 }
phungductung 0:8ede47d38d10 188
phungductung 0:8ede47d38d10 189 union {
phungductung 0:8ede47d38d10 190 R (*function)(void); // static function pointer
phungductung 0:8ede47d38d10 191 void *object; // object this pointer
phungductung 0:8ede47d38d10 192 } _p;
phungductung 0:8ede47d38d10 193 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
phungductung 0:8ede47d38d10 194 R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
phungductung 0:8ede47d38d10 195 };
phungductung 0:8ede47d38d10 196
phungductung 0:8ede47d38d10 197 typedef FunctionPointerArg1<void, void> FunctionPointer;
phungductung 0:8ede47d38d10 198 typedef FunctionPointerArg1<void, int> event_callback_t;
phungductung 0:8ede47d38d10 199
phungductung 0:8ede47d38d10 200 } // namespace mbed
phungductung 0:8ede47d38d10 201
phungductung 0:8ede47d38d10 202 #endif