Bei Chen Liu / mbed-src

mbed library sources

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api/FunctionPointer.h@582:ed68b5b3ef6d, 2015-07-03 (annotated)

Committer:
Baycken
Date:
Fri Jul 03 17:02:48 2015 +0000
Revision:
582:ed68b5b3ef6d
Parent:
525:c320967f86b9 
Disable Hardware Flow Control

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 13:0645d8841f51 1 /* mbed Microcontroller Library
mbed_official 525:c320967f86b9 2 * Copyright (c) 2006-2015 ARM Limited
bogdanm 13:0645d8841f51 3 *
bogdanm 13:0645d8841f51 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 13:0645d8841f51 5 * you may not use this file except in compliance with the License.
bogdanm 13:0645d8841f51 6 * You may obtain a copy of the License at
bogdanm 13:0645d8841f51 7 *
bogdanm 13:0645d8841f51 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 13:0645d8841f51 9 *
bogdanm 13:0645d8841f51 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 13:0645d8841f51 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 13:0645d8841f51 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 13:0645d8841f51 13 * See the License for the specific language governing permissions and
bogdanm 13:0645d8841f51 14 * limitations under the License.
bogdanm 13:0645d8841f51 15 */
bogdanm 13:0645d8841f51 16 #ifndef MBED_FUNCTIONPOINTER_H
bogdanm 13:0645d8841f51 17 #define MBED_FUNCTIONPOINTER_H
bogdanm 13:0645d8841f51 18
bogdanm 13:0645d8841f51 19 #include <string.h>
mbed_official 525:c320967f86b9 20 #include <stdint.h>
bogdanm 13:0645d8841f51 21
bogdanm 13:0645d8841f51 22 namespace mbed {
bogdanm 13:0645d8841f51 23
mbed_official 525:c320967f86b9 24 /* If we had variaditic templates, this wouldn't be a problem, but until C++11 is enabled, we are stuck with multiple classes... */
bogdanm 15:4892fe388435 25
mbed_official 525:c320967f86b9 26 /** A class for storing and calling a pointer to a static or member function
bogdanm 13:0645d8841f51 27 */
mbed_official 525:c320967f86b9 28 template <typename R, typename A1>
mbed_official 525:c320967f86b9 29 class FunctionPointerArg1{
bogdanm 13:0645d8841f51 30 public:
bogdanm 13:0645d8841f51 31 /** Create a FunctionPointer, attaching a static function
bogdanm 13:0645d8841f51 32 *
mbed_official 525:c320967f86b9 33 * @param function The static function to attach (default is none)
mbed_official 525:c320967f86b9 34 */
mbed_official 525:c320967f86b9 35 FunctionPointerArg1(R (*function)(A1) = 0) {
mbed_official 525:c320967f86b9 36 attach(function);
mbed_official 525:c320967f86b9 37 }
mbed_official 525:c320967f86b9 38
mbed_official 525:c320967f86b9 39 /** Create a FunctionPointer, attaching a member function
mbed_official 525:c320967f86b9 40 *
mbed_official 525:c320967f86b9 41 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
mbed_official 525:c320967f86b9 42 * @param function The address of the member function to attach
mbed_official 525:c320967f86b9 43 */
mbed_official 525:c320967f86b9 44 template<typename T>
mbed_official 525:c320967f86b9 45 FunctionPointerArg1(T *object, R (T::*member)(A1)) {
mbed_official 525:c320967f86b9 46 attach(object, member);
mbed_official 525:c320967f86b9 47 }
mbed_official 525:c320967f86b9 48
mbed_official 525:c320967f86b9 49 /** Attach a static function
mbed_official 525:c320967f86b9 50 *
mbed_official 525:c320967f86b9 51 * @param function The static function to attach (default is none)
mbed_official 525:c320967f86b9 52 */
mbed_official 525:c320967f86b9 53 void attach(R (*function)(A1)) {
mbed_official 525:c320967f86b9 54 _p.function = function;
mbed_official 525:c320967f86b9 55 _membercaller = 0;
mbed_official 525:c320967f86b9 56 }
mbed_official 525:c320967f86b9 57
mbed_official 525:c320967f86b9 58 /** Attach a member function
mbed_official 525:c320967f86b9 59 *
mbed_official 525:c320967f86b9 60 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
mbed_official 525:c320967f86b9 61 * @param function The address of the member function to attach
mbed_official 525:c320967f86b9 62 */
mbed_official 525:c320967f86b9 63 template<typename T>
mbed_official 525:c320967f86b9 64 void attach(T *object, R (T::*member)(A1)) {
mbed_official 525:c320967f86b9 65 _p.object = static_cast<void*>(object);
mbed_official 525:c320967f86b9 66 *reinterpret_cast<R (T::**)(A1)>(_member) = member;
mbed_official 525:c320967f86b9 67 _membercaller = &FunctionPointerArg1::membercaller<T>;
mbed_official 525:c320967f86b9 68 }
mbed_official 525:c320967f86b9 69
mbed_official 525:c320967f86b9 70 /** Call the attached static or member function
bogdanm 13:0645d8841f51 71 */
mbed_official 525:c320967f86b9 72 R call(A1 a) {
mbed_official 525:c320967f86b9 73 if (_membercaller == 0 && _p.function) {
mbed_official 525:c320967f86b9 74 return _p.function(a);
mbed_official 525:c320967f86b9 75 } else if (_membercaller && _p.object) {
mbed_official 525:c320967f86b9 76 return _membercaller(_p.object, _member, a);
mbed_official 525:c320967f86b9 77 }
mbed_official 525:c320967f86b9 78 return (R)0;
mbed_official 525:c320967f86b9 79 }
mbed_official 525:c320967f86b9 80
mbed_official 525:c320967f86b9 81 /** Get registered static function
mbed_official 525:c320967f86b9 82 */
mbed_official 525:c320967f86b9 83 R(*get_function(A1))() {
mbed_official 525:c320967f86b9 84 return _membercaller ? (R(*)(A1))0 : (R(*)(A1))_p.function;
mbed_official 525:c320967f86b9 85 }
mbed_official 525:c320967f86b9 86
mbed_official 525:c320967f86b9 87 #ifdef MBED_OPERATORS
mbed_official 525:c320967f86b9 88 R operator ()(A1 a) {
mbed_official 525:c320967f86b9 89 return call(a);
mbed_official 525:c320967f86b9 90 }
mbed_official 525:c320967f86b9 91 operator bool(void) const {
mbed_official 525:c320967f86b9 92 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
mbed_official 525:c320967f86b9 93 }
mbed_official 525:c320967f86b9 94 #endif
mbed_official 525:c320967f86b9 95 private:
mbed_official 525:c320967f86b9 96 template<typename T>
mbed_official 525:c320967f86b9 97 static R membercaller(void *object, uintptr_t *member, A1 a) {
mbed_official 525:c320967f86b9 98 T* o = static_cast<T*>(object);
mbed_official 525:c320967f86b9 99 R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
mbed_official 525:c320967f86b9 100 return (o->**m)(a);
mbed_official 525:c320967f86b9 101 }
mbed_official 525:c320967f86b9 102
mbed_official 525:c320967f86b9 103 union {
mbed_official 525:c320967f86b9 104 R (*function)(A1); // static function pointer
mbed_official 525:c320967f86b9 105 void *object; // object this pointer
mbed_official 525:c320967f86b9 106 } _p;
mbed_official 525:c320967f86b9 107 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
mbed_official 525:c320967f86b9 108 R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
mbed_official 525:c320967f86b9 109 };
mbed_official 525:c320967f86b9 110
mbed_official 525:c320967f86b9 111 /** A class for storing and calling a pointer to a static or member function (R ()(void))
mbed_official 525:c320967f86b9 112 */
mbed_official 525:c320967f86b9 113 template <typename R>
mbed_official 525:c320967f86b9 114 class FunctionPointerArg1<R, void>{
mbed_official 525:c320967f86b9 115 public:
mbed_official 525:c320967f86b9 116 /** Create a FunctionPointer, attaching a static function
mbed_official 525:c320967f86b9 117 *
mbed_official 525:c320967f86b9 118 * @param function The static function to attach (default is none)
mbed_official 525:c320967f86b9 119 */
mbed_official 525:c320967f86b9 120 FunctionPointerArg1(R (*function)(void) = 0) {
mbed_official 525:c320967f86b9 121 attach(function);
mbed_official 525:c320967f86b9 122 }
bogdanm 13:0645d8841f51 123
bogdanm 13:0645d8841f51 124 /** Create a FunctionPointer, attaching a member function
bogdanm 13:0645d8841f51 125 *
bogdanm 13:0645d8841f51 126 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
bogdanm 13:0645d8841f51 127 * @param function The address of the void member function to attach
bogdanm 13:0645d8841f51 128 */
bogdanm 13:0645d8841f51 129 template<typename T>
mbed_official 525:c320967f86b9 130 FunctionPointerArg1(T *object, R (T::*member)(void)) {
bogdanm 13:0645d8841f51 131 attach(object, member);
bogdanm 13:0645d8841f51 132 }
bogdanm 13:0645d8841f51 133
bogdanm 13:0645d8841f51 134 /** Attach a static function
bogdanm 13:0645d8841f51 135 *
bogdanm 13:0645d8841f51 136 * @param function The void static function to attach (default is none)
bogdanm 13:0645d8841f51 137 */
mbed_official 525:c320967f86b9 138 void attach(R (*function)(void)) {
mbed_official 525:c320967f86b9 139 _p.function = function;
mbed_official 525:c320967f86b9 140 _membercaller = 0;
mbed_official 525:c320967f86b9 141 }
bogdanm 13:0645d8841f51 142
bogdanm 13:0645d8841f51 143 /** Attach a member function
bogdanm 13:0645d8841f51 144 *
bogdanm 13:0645d8841f51 145 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
bogdanm 13:0645d8841f51 146 * @param function The address of the void member function to attach
bogdanm 13:0645d8841f51 147 */
bogdanm 13:0645d8841f51 148 template<typename T>
mbed_official 525:c320967f86b9 149 void attach(T *object, R (T::*member)(void)) {
mbed_official 525:c320967f86b9 150 _p.object = static_cast<void*>(object);
mbed_official 525:c320967f86b9 151 *reinterpret_cast<R (T::**)(void)>(_member) = member;
mbed_official 525:c320967f86b9 152 _membercaller = &FunctionPointerArg1::membercaller<T>;
bogdanm 13:0645d8841f51 153 }
bogdanm 13:0645d8841f51 154
bogdanm 13:0645d8841f51 155 /** Call the attached static or member function
bogdanm 13:0645d8841f51 156 */
mbed_official 525:c320967f86b9 157 R call(){
mbed_official 525:c320967f86b9 158 if (_membercaller == 0 && _p.function) {
mbed_official 525:c320967f86b9 159 return _p.function();
mbed_official 525:c320967f86b9 160 } else if (_membercaller && _p.object) {
mbed_official 525:c320967f86b9 161 return _membercaller(_p.object, _member);
mbed_official 525:c320967f86b9 162 }
mbed_official 525:c320967f86b9 163 return (R)0;
mbed_official 525:c320967f86b9 164 }
bogdanm 13:0645d8841f51 165
mbed_official 525:c320967f86b9 166 /** Get registered static function
mbed_official 525:c320967f86b9 167 */
mbed_official 525:c320967f86b9 168 R(*get_function())() {
mbed_official 525:c320967f86b9 169 return _membercaller ? (R(*)())0 : (R(*)())_p.function;
bogdanm 15:4892fe388435 170 }
bogdanm 15:4892fe388435 171
bogdanm 15:4892fe388435 172 #ifdef MBED_OPERATORS
mbed_official 525:c320967f86b9 173 R operator ()(void) {
mbed_official 525:c320967f86b9 174 return call();
mbed_official 525:c320967f86b9 175 }
mbed_official 525:c320967f86b9 176 operator bool(void) const {
mbed_official 525:c320967f86b9 177 return (_membercaller != NULL ? _p.object : (void*)_p.function) != NULL;
mbed_official 525:c320967f86b9 178 }
bogdanm 15:4892fe388435 179 #endif
bogdanm 15:4892fe388435 180
bogdanm 13:0645d8841f51 181 private:
bogdanm 13:0645d8841f51 182 template<typename T>
mbed_official 525:c320967f86b9 183 static R membercaller(void *object, uintptr_t *member) {
bogdanm 13:0645d8841f51 184 T* o = static_cast<T*>(object);
mbed_official 525:c320967f86b9 185 R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
mbed_official 525:c320967f86b9 186 return (o->**m)();
bogdanm 13:0645d8841f51 187 }
bogdanm 13:0645d8841f51 188
mbed_official 525:c320967f86b9 189 union {
mbed_official 525:c320967f86b9 190 R (*function)(void); // static function pointer
mbed_official 525:c320967f86b9 191 void *object; // object this pointer
mbed_official 525:c320967f86b9 192 } _p;
mbed_official 525:c320967f86b9 193 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
mbed_official 525:c320967f86b9 194 R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
bogdanm 13:0645d8841f51 195 };
bogdanm 13:0645d8841f51 196
mbed_official 525:c320967f86b9 197 typedef FunctionPointerArg1<void, void> FunctionPointer;
mbed_official 525:c320967f86b9 198 typedef FunctionPointerArg1<void, int> event_callback_t;
mbed_official 525:c320967f86b9 199
bogdanm 13:0645d8841f51 200 } // namespace mbed
bogdanm 13:0645d8841f51 201
bogdanm 13:0645d8841f51 202 #endif