Lancaster University / mbed-dev-bin

Binary version of Lancaster University's mbed branch, soon to be merged. The source lives here:https://developer.mbed.org/teams/Lancaster-University/code/mbed-src/

Dependents:   microbit-dal microbit-ble-open microbit-dal-eddystone microbit-dal ... more

Fork of mbed-lite-test by Lancaster University

FunctionPointer.h@3:768173a57492, 2016-07-13 (annotated)

Committer:
jamesadevine
Date:
Wed Jul 13 15:12:06 2016 +0100
Revision:
3:768173a57492
Parent:
0:e1a608bb55e8 
further updates to mbed-dev-bin

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jamesadevine 0:e1a608bb55e8 1 /* mbed Microcontroller Library
jamesadevine 0:e1a608bb55e8 2 * Copyright (c) 2006-2015 ARM Limited
jamesadevine 0:e1a608bb55e8 3 *
jamesadevine 0:e1a608bb55e8 4 * Licensed under the Apache License, Version 2.0 (the "License");
jamesadevine 0:e1a608bb55e8 5 * you may not use this file except in compliance with the License.
jamesadevine 0:e1a608bb55e8 6 * You may obtain a copy of the License at
jamesadevine 0:e1a608bb55e8 7 *
jamesadevine 0:e1a608bb55e8 8 * http://www.apache.org/licenses/LICENSE-2.0
jamesadevine 0:e1a608bb55e8 9 *
jamesadevine 0:e1a608bb55e8 10 * Unless required by applicable law or agreed to in writing, software
jamesadevine 0:e1a608bb55e8 11 * distributed under the License is distributed on an "AS IS" BASIS,
jamesadevine 0:e1a608bb55e8 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
jamesadevine 0:e1a608bb55e8 13 * See the License for the specific language governing permissions and
jamesadevine 0:e1a608bb55e8 14 * limitations under the License.
jamesadevine 0:e1a608bb55e8 15 */
jamesadevine 0:e1a608bb55e8 16 #ifndef MBED_FUNCTIONPOINTER_H
jamesadevine 0:e1a608bb55e8 17 #define MBED_FUNCTIONPOINTER_H
jamesadevine 0:e1a608bb55e8 18
jamesadevine 0:e1a608bb55e8 19 #include <string.h>
jamesadevine 0:e1a608bb55e8 20 #include <stdint.h>
jamesadevine 0:e1a608bb55e8 21
jamesadevine 0:e1a608bb55e8 22 namespace mbed {
jamesadevine 0:e1a608bb55e8 23
jamesadevine 0:e1a608bb55e8 24 /* If we had variaditic templates, this wouldn't be a problem, but until C++11 is enabled, we are stuck with multiple classes... */
jamesadevine 0:e1a608bb55e8 25
jamesadevine 0:e1a608bb55e8 26 /** A class for storing and calling a pointer to a static or member function
jamesadevine 0:e1a608bb55e8 27 */
jamesadevine 0:e1a608bb55e8 28 template <typename R, typename A1>
jamesadevine 0:e1a608bb55e8 29 class FunctionPointerArg1{
jamesadevine 0:e1a608bb55e8 30 public:
jamesadevine 0:e1a608bb55e8 31 /** Create a FunctionPointer, attaching a static function
jamesadevine 0:e1a608bb55e8 32 *
jamesadevine 0:e1a608bb55e8 33 * @param function The static function to attach (default is none)
jamesadevine 0:e1a608bb55e8 34 */
jamesadevine 0:e1a608bb55e8 35 FunctionPointerArg1(R (*function)(A1) = 0) {
jamesadevine 0:e1a608bb55e8 36 attach(function);
jamesadevine 0:e1a608bb55e8 37 }
jamesadevine 0:e1a608bb55e8 38
jamesadevine 0:e1a608bb55e8 39 /** Create a FunctionPointer, attaching a member function
jamesadevine 0:e1a608bb55e8 40 *
jamesadevine 0:e1a608bb55e8 41 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
jamesadevine 0:e1a608bb55e8 42 * @param function The address of the member function to attach
jamesadevine 0:e1a608bb55e8 43 */
jamesadevine 0:e1a608bb55e8 44 template<typename T>
jamesadevine 0:e1a608bb55e8 45 FunctionPointerArg1(T *object, R (T::*member)(A1)) {
jamesadevine 0:e1a608bb55e8 46 attach(object, member);
jamesadevine 0:e1a608bb55e8 47 }
jamesadevine 0:e1a608bb55e8 48
jamesadevine 0:e1a608bb55e8 49 /** Attach a static function
jamesadevine 0:e1a608bb55e8 50 *
jamesadevine 0:e1a608bb55e8 51 * @param function The static function to attach (default is none)
jamesadevine 0:e1a608bb55e8 52 */
jamesadevine 0:e1a608bb55e8 53 void attach(R (*function)(A1)) {
jamesadevine 0:e1a608bb55e8 54 _p.function = function;
jamesadevine 0:e1a608bb55e8 55 _membercaller = 0;
jamesadevine 0:e1a608bb55e8 56 }
jamesadevine 0:e1a608bb55e8 57
jamesadevine 0:e1a608bb55e8 58 /** Attach a member function
jamesadevine 0:e1a608bb55e8 59 *
jamesadevine 0:e1a608bb55e8 60 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
jamesadevine 0:e1a608bb55e8 61 * @param function The address of the member function to attach
jamesadevine 0:e1a608bb55e8 62 */
jamesadevine 0:e1a608bb55e8 63 template<typename T>
jamesadevine 0:e1a608bb55e8 64 void attach(T *object, R (T::*member)(A1)) {
jamesadevine 0:e1a608bb55e8 65 _p.object = static_cast<void*>(object);
jamesadevine 0:e1a608bb55e8 66 *reinterpret_cast<R (T::**)(A1)>(_member) = member;
jamesadevine 0:e1a608bb55e8 67 _membercaller = &FunctionPointerArg1::membercaller<T>;
jamesadevine 0:e1a608bb55e8 68 }
jamesadevine 0:e1a608bb55e8 69
jamesadevine 0:e1a608bb55e8 70 /** Call the attached static or member function
jamesadevine 0:e1a608bb55e8 71 */
jamesadevine 0:e1a608bb55e8 72 R call(A1 a) {
jamesadevine 0:e1a608bb55e8 73 if (_membercaller == 0 && _p.function) {
jamesadevine 0:e1a608bb55e8 74 return _p.function(a);
jamesadevine 0:e1a608bb55e8 75 } else if (_membercaller && _p.object) {
jamesadevine 0:e1a608bb55e8 76 return _membercaller(_p.object, _member, a);
jamesadevine 0:e1a608bb55e8 77 }
jamesadevine 0:e1a608bb55e8 78 return (R)0;
jamesadevine 0:e1a608bb55e8 79 }
jamesadevine 0:e1a608bb55e8 80
jamesadevine 0:e1a608bb55e8 81 /** Get registered static function
jamesadevine 0:e1a608bb55e8 82 */
jamesadevine 0:e1a608bb55e8 83 R(*get_function(A1))() {
jamesadevine 0:e1a608bb55e8 84 return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function;
jamesadevine 0:e1a608bb55e8 85 }
jamesadevine 0:e1a608bb55e8 86
jamesadevine 0:e1a608bb55e8 87 #ifdef MBED_OPERATORS
jamesadevine 0:e1a608bb55e8 88 R operator ()(A1 a) {
jamesadevine 0:e1a608bb55e8 89 return call(a);
jamesadevine 0:e1a608bb55e8 90 }
jamesadevine 0:e1a608bb55e8 91 operator bool(void) const {
jamesadevine 0:e1a608bb55e8 92 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
jamesadevine 0:e1a608bb55e8 93 }
jamesadevine 0:e1a608bb55e8 94 #endif
jamesadevine 0:e1a608bb55e8 95 private:
jamesadevine 0:e1a608bb55e8 96 template<typename T>
jamesadevine 0:e1a608bb55e8 97 static R membercaller(void *object, uintptr_t *member, A1 a) {
jamesadevine 0:e1a608bb55e8 98 T* o = static_cast<T*>(object);
jamesadevine 0:e1a608bb55e8 99 R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
jamesadevine 0:e1a608bb55e8 100 return (o->**m)(a);
jamesadevine 0:e1a608bb55e8 101 }
jamesadevine 0:e1a608bb55e8 102
jamesadevine 0:e1a608bb55e8 103 union {
jamesadevine 0:e1a608bb55e8 104 R (*function)(A1); // static function pointer
jamesadevine 0:e1a608bb55e8 105 void *object; // object this pointer
jamesadevine 0:e1a608bb55e8 106 } _p;
jamesadevine 0:e1a608bb55e8 107 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
jamesadevine 0:e1a608bb55e8 108 R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
jamesadevine 0:e1a608bb55e8 109 };
jamesadevine 0:e1a608bb55e8 110
jamesadevine 0:e1a608bb55e8 111 /** A class for storing and calling a pointer to a static or member function (R ()(void))
jamesadevine 0:e1a608bb55e8 112 */
jamesadevine 0:e1a608bb55e8 113 template <typename R>
jamesadevine 0:e1a608bb55e8 114 class FunctionPointerArg1<R, void>{
jamesadevine 0:e1a608bb55e8 115 public:
jamesadevine 0:e1a608bb55e8 116 /** Create a FunctionPointer, attaching a static function
jamesadevine 0:e1a608bb55e8 117 *
jamesadevine 0:e1a608bb55e8 118 * @param function The static function to attach (default is none)
jamesadevine 0:e1a608bb55e8 119 */
jamesadevine 0:e1a608bb55e8 120 FunctionPointerArg1(R (*function)(void) = 0) {
jamesadevine 0:e1a608bb55e8 121 attach(function);
jamesadevine 0:e1a608bb55e8 122 }
jamesadevine 0:e1a608bb55e8 123
jamesadevine 0:e1a608bb55e8 124 /** Create a FunctionPointer, attaching a member function
jamesadevine 0:e1a608bb55e8 125 *
jamesadevine 0:e1a608bb55e8 126 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
jamesadevine 0:e1a608bb55e8 127 * @param function The address of the void member function to attach
jamesadevine 0:e1a608bb55e8 128 */
jamesadevine 0:e1a608bb55e8 129 template<typename T>
jamesadevine 0:e1a608bb55e8 130 FunctionPointerArg1(T *object, R (T::*member)(void)) {
jamesadevine 0:e1a608bb55e8 131 attach(object, member);
jamesadevine 0:e1a608bb55e8 132 }
jamesadevine 0:e1a608bb55e8 133
jamesadevine 0:e1a608bb55e8 134 /** Attach a static function
jamesadevine 0:e1a608bb55e8 135 *
jamesadevine 0:e1a608bb55e8 136 * @param function The void static function to attach (default is none)
jamesadevine 0:e1a608bb55e8 137 */
jamesadevine 0:e1a608bb55e8 138 void attach(R (*function)(void)) {
jamesadevine 0:e1a608bb55e8 139 _p.function = function;
jamesadevine 0:e1a608bb55e8 140 _membercaller = 0;
jamesadevine 0:e1a608bb55e8 141 }
jamesadevine 0:e1a608bb55e8 142
jamesadevine 0:e1a608bb55e8 143 /** Attach a member function
jamesadevine 0:e1a608bb55e8 144 *
jamesadevine 0:e1a608bb55e8 145 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
jamesadevine 0:e1a608bb55e8 146 * @param function The address of the void member function to attach
jamesadevine 0:e1a608bb55e8 147 */
jamesadevine 0:e1a608bb55e8 148 template<typename T>
jamesadevine 0:e1a608bb55e8 149 void attach(T *object, R (T::*member)(void)) {
jamesadevine 0:e1a608bb55e8 150 _p.object = static_cast<void*>(object);
jamesadevine 0:e1a608bb55e8 151 *reinterpret_cast<R (T::**)(void)>(_member) = member;
jamesadevine 0:e1a608bb55e8 152 _membercaller = &FunctionPointerArg1::membercaller<T>;
jamesadevine 0:e1a608bb55e8 153 }
jamesadevine 0:e1a608bb55e8 154
jamesadevine 0:e1a608bb55e8 155 /** Call the attached static or member function
jamesadevine 0:e1a608bb55e8 156 */
jamesadevine 0:e1a608bb55e8 157 R call(){
jamesadevine 0:e1a608bb55e8 158 if (_membercaller == 0 && _p.function) {
jamesadevine 0:e1a608bb55e8 159 return _p.function();
jamesadevine 0:e1a608bb55e8 160 } else if (_membercaller && _p.object) {
jamesadevine 0:e1a608bb55e8 161 return _membercaller(_p.object, _member);
jamesadevine 0:e1a608bb55e8 162 }
jamesadevine 0:e1a608bb55e8 163 return (R)0;
jamesadevine 0:e1a608bb55e8 164 }
jamesadevine 0:e1a608bb55e8 165
jamesadevine 0:e1a608bb55e8 166 /** Get registered static function
jamesadevine 0:e1a608bb55e8 167 */
jamesadevine 0:e1a608bb55e8 168 R(*get_function())() {
jamesadevine 0:e1a608bb55e8 169 return _membercaller ? (R(*)())0 : (R(*)())_p.function;
jamesadevine 0:e1a608bb55e8 170 }
jamesadevine 0:e1a608bb55e8 171
jamesadevine 0:e1a608bb55e8 172 #ifdef MBED_OPERATORS
jamesadevine 0:e1a608bb55e8 173 R operator ()(void) {
jamesadevine 0:e1a608bb55e8 174 return call();
jamesadevine 0:e1a608bb55e8 175 }
jamesadevine 0:e1a608bb55e8 176 operator bool(void) const {
jamesadevine 0:e1a608bb55e8 177 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
jamesadevine 0:e1a608bb55e8 178 }
jamesadevine 0:e1a608bb55e8 179 #endif
jamesadevine 0:e1a608bb55e8 180
jamesadevine 0:e1a608bb55e8 181 private:
jamesadevine 0:e1a608bb55e8 182 template<typename T>
jamesadevine 0:e1a608bb55e8 183 static R membercaller(void *object, uintptr_t *member) {
jamesadevine 0:e1a608bb55e8 184 T* o = static_cast<T*>(object);
jamesadevine 0:e1a608bb55e8 185 R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
jamesadevine 0:e1a608bb55e8 186 return (o->**m)();
jamesadevine 0:e1a608bb55e8 187 }
jamesadevine 0:e1a608bb55e8 188
jamesadevine 0:e1a608bb55e8 189 union {
jamesadevine 0:e1a608bb55e8 190 R (*function)(void); // static function pointer
jamesadevine 0:e1a608bb55e8 191 void *object; // object this pointer
jamesadevine 0:e1a608bb55e8 192 } _p;
jamesadevine 0:e1a608bb55e8 193 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
jamesadevine 0:e1a608bb55e8 194 R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
jamesadevine 0:e1a608bb55e8 195 };
jamesadevine 0:e1a608bb55e8 196
jamesadevine 0:e1a608bb55e8 197 typedef FunctionPointerArg1<void, void> FunctionPointer;
jamesadevine 0:e1a608bb55e8 198 typedef FunctionPointerArg1<void, int> event_callback_t;
jamesadevine 0:e1a608bb55e8 199
jamesadevine 0:e1a608bb55e8 200 } // namespace mbed
jamesadevine 0:e1a608bb55e8 201
jamesadevine 0:e1a608bb55e8 202 #endif