Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbed-client/mbed-client/functionpointer.h@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

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mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * Copyright (c) 2015 ARM Limited. All rights reserved.
mbedAustin 11:cada08fc8a70 3 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 4 * Licensed under the Apache License, Version 2.0 (the License); you may
mbedAustin 11:cada08fc8a70 5 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 6 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 7 *
mbedAustin 11:cada08fc8a70 8 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 9 *
mbedAustin 11:cada08fc8a70 10 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 11 * distributed under the License is distributed on an AS IS BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 12 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 13 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 14 * limitations under the License.
mbedAustin 11:cada08fc8a70 15 */
mbedAustin 11:cada08fc8a70 16 #ifndef FUNCTIONPOINTER_H
mbedAustin 11:cada08fc8a70 17 #define FUNCTIONPOINTER_H
mbedAustin 11:cada08fc8a70 18
mbedAustin 11:cada08fc8a70 19 #include <string.h>
mbedAustin 11:cada08fc8a70 20 #include <stdint.h>
mbedAustin 11:cada08fc8a70 21
mbedAustin 11:cada08fc8a70 22
mbedAustin 11:cada08fc8a70 23 /** A class for storing and calling a pointer to a static or member void function
mbedAustin 11:cada08fc8a70 24 */
mbedAustin 11:cada08fc8a70 25 template <typename R>
mbedAustin 11:cada08fc8a70 26 class FP0{
mbedAustin 11:cada08fc8a70 27 public:
mbedAustin 11:cada08fc8a70 28 /** Create a FunctionPointer, attaching a static function
mbedAustin 11:cada08fc8a70 29 *
mbedAustin 11:cada08fc8a70 30 * @param function The void static function to attach (default is none)
mbedAustin 11:cada08fc8a70 31 */
mbedAustin 11:cada08fc8a70 32 FP0(R (*function)(void) = 0) {
mbedAustin 11:cada08fc8a70 33 attach(function);
mbedAustin 11:cada08fc8a70 34 }
mbedAustin 11:cada08fc8a70 35
mbedAustin 11:cada08fc8a70 36 /** Create a FP, attaching a member function
mbedAustin 11:cada08fc8a70 37 *
mbedAustin 11:cada08fc8a70 38 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
mbedAustin 11:cada08fc8a70 39 * @param function The address of the void member function to attach
mbedAustin 11:cada08fc8a70 40 */
mbedAustin 11:cada08fc8a70 41 template<typename T>
mbedAustin 11:cada08fc8a70 42 FP0(T *object, R (T::*member)(void)) {
mbedAustin 11:cada08fc8a70 43 attach(object, member);
mbedAustin 11:cada08fc8a70 44 }
mbedAustin 11:cada08fc8a70 45
mbedAustin 11:cada08fc8a70 46 /** Attach a static function
mbedAustin 11:cada08fc8a70 47 *
mbedAustin 11:cada08fc8a70 48 * @param function The void static function to attach (default is none)
mbedAustin 11:cada08fc8a70 49 */
mbedAustin 11:cada08fc8a70 50 void attach(R (*function)(void)) {
mbedAustin 11:cada08fc8a70 51 _p.function = function;
mbedAustin 11:cada08fc8a70 52 _membercaller = 0;
mbedAustin 11:cada08fc8a70 53 }
mbedAustin 11:cada08fc8a70 54
mbedAustin 11:cada08fc8a70 55 /** Attach a member function
mbedAustin 11:cada08fc8a70 56 *
mbedAustin 11:cada08fc8a70 57 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
mbedAustin 11:cada08fc8a70 58 * @param function The address of the void member function to attach
mbedAustin 11:cada08fc8a70 59 */
mbedAustin 11:cada08fc8a70 60 template<typename T>
mbedAustin 11:cada08fc8a70 61 void attach(T *object, R (T::*member)(void)) {
mbedAustin 11:cada08fc8a70 62 _p.object = static_cast<void*>(object);
mbedAustin 11:cada08fc8a70 63 *reinterpret_cast<R (T::**)(void)>(_member) = member;
mbedAustin 11:cada08fc8a70 64 _membercaller = &FP0::membercaller<T>;
mbedAustin 11:cada08fc8a70 65 }
mbedAustin 11:cada08fc8a70 66
mbedAustin 11:cada08fc8a70 67 /** Call the attached static or member function
mbedAustin 11:cada08fc8a70 68 */
mbedAustin 11:cada08fc8a70 69 R call(){
mbedAustin 11:cada08fc8a70 70 if (_membercaller == 0 && _p.function) {
mbedAustin 11:cada08fc8a70 71 return _p.function();
mbedAustin 11:cada08fc8a70 72 } else if (_membercaller && _p.object) {
mbedAustin 11:cada08fc8a70 73 return _membercaller(_p.object, _member);
mbedAustin 11:cada08fc8a70 74 }
mbedAustin 11:cada08fc8a70 75 return (R)0;
mbedAustin 11:cada08fc8a70 76 }
mbedAustin 11:cada08fc8a70 77
mbedAustin 11:cada08fc8a70 78 typedef R (*static_fp)();
mbedAustin 11:cada08fc8a70 79 static_fp get_function() const {
mbedAustin 11:cada08fc8a70 80 return (R(*)())_p.function;
mbedAustin 11:cada08fc8a70 81 }
mbedAustin 11:cada08fc8a70 82
mbedAustin 11:cada08fc8a70 83 R operator ()(void) {
mbedAustin 11:cada08fc8a70 84 return call();
mbedAustin 11:cada08fc8a70 85 }
mbedAustin 11:cada08fc8a70 86 operator bool(void) {
mbedAustin 11:cada08fc8a70 87 void *q = &_p.function;
mbedAustin 11:cada08fc8a70 88 return (_membercaller != NULL) && _p.object != NULL && (*static_cast<void **>(q) != NULL);
mbedAustin 11:cada08fc8a70 89 }
mbedAustin 11:cada08fc8a70 90
mbedAustin 11:cada08fc8a70 91 private:
mbedAustin 11:cada08fc8a70 92 template<typename T>
mbedAustin 11:cada08fc8a70 93 static void membercaller(void *object, uintptr_t *member) {
mbedAustin 11:cada08fc8a70 94 T* o = static_cast<T*>(object);
mbedAustin 11:cada08fc8a70 95 R (T::**m)(void) = reinterpret_cast<R (T::**)(void)>(member);
mbedAustin 11:cada08fc8a70 96 (o->**m)();
mbedAustin 11:cada08fc8a70 97 }
mbedAustin 11:cada08fc8a70 98
mbedAustin 11:cada08fc8a70 99 union {
mbedAustin 11:cada08fc8a70 100 R (*function)(void); // static function pointer - 0 if none attached
mbedAustin 11:cada08fc8a70 101 void *object; // object this pointer - 0 if none attached
mbedAustin 11:cada08fc8a70 102 } _p;
mbedAustin 11:cada08fc8a70 103 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
mbedAustin 11:cada08fc8a70 104 R (*_membercaller)(void*, uintptr_t*); // registered membercaller function to convert back and call _m.member on _object
mbedAustin 11:cada08fc8a70 105 };
mbedAustin 11:cada08fc8a70 106
mbedAustin 11:cada08fc8a70 107 /* If we had variadic templates, this wouldn't be a problem, but until C++11 is enabled, we are stuck with multiple classes... */
mbedAustin 11:cada08fc8a70 108
mbedAustin 11:cada08fc8a70 109 /** A class for storing and calling a pointer to a static or member void function
mbedAustin 11:cada08fc8a70 110 */
mbedAustin 11:cada08fc8a70 111 template <typename R, typename A1>
mbedAustin 11:cada08fc8a70 112 class FP1{
mbedAustin 11:cada08fc8a70 113 public:
mbedAustin 11:cada08fc8a70 114 /** Create a FP, attaching a static function
mbedAustin 11:cada08fc8a70 115 *
mbedAustin 11:cada08fc8a70 116 * @param function The void static function to attach (default is none)
mbedAustin 11:cada08fc8a70 117 */
mbedAustin 11:cada08fc8a70 118 FP1(R (*function)(A1) = 0) {
mbedAustin 11:cada08fc8a70 119 attach(function);
mbedAustin 11:cada08fc8a70 120 }
mbedAustin 11:cada08fc8a70 121
mbedAustin 11:cada08fc8a70 122 /** Create a FP, attaching a member function
mbedAustin 11:cada08fc8a70 123 *
mbedAustin 11:cada08fc8a70 124 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
mbedAustin 11:cada08fc8a70 125 * @param function The address of the void member function to attach
mbedAustin 11:cada08fc8a70 126 */
mbedAustin 11:cada08fc8a70 127 template<typename T>
mbedAustin 11:cada08fc8a70 128 FP1(T *object, R (T::*member)(A1)) {
mbedAustin 11:cada08fc8a70 129 attach(object, member);
mbedAustin 11:cada08fc8a70 130 }
mbedAustin 11:cada08fc8a70 131
mbedAustin 11:cada08fc8a70 132 /** Attach a static function
mbedAustin 11:cada08fc8a70 133 *
mbedAustin 11:cada08fc8a70 134 * @param function The void static function to attach (default is none)
mbedAustin 11:cada08fc8a70 135 */
mbedAustin 11:cada08fc8a70 136 void attach(R (*function)(A1)) {
mbedAustin 11:cada08fc8a70 137 _p.function = function;
mbedAustin 11:cada08fc8a70 138 _membercaller = 0;
mbedAustin 11:cada08fc8a70 139 }
mbedAustin 11:cada08fc8a70 140
mbedAustin 11:cada08fc8a70 141 /** Attach a member function
mbedAustin 11:cada08fc8a70 142 *
mbedAustin 11:cada08fc8a70 143 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
mbedAustin 11:cada08fc8a70 144 * @param function The address of the void member function to attach
mbedAustin 11:cada08fc8a70 145 */
mbedAustin 11:cada08fc8a70 146 template<typename T>
mbedAustin 11:cada08fc8a70 147 void attach(T *object, R (T::*member)(A1)) {
mbedAustin 11:cada08fc8a70 148 _p.object = static_cast<void*>(object);
mbedAustin 11:cada08fc8a70 149 *reinterpret_cast<R (T::**)(A1)>(_member) = member;
mbedAustin 11:cada08fc8a70 150 _membercaller = &FP1::membercaller<T>;
mbedAustin 11:cada08fc8a70 151 }
mbedAustin 11:cada08fc8a70 152
mbedAustin 11:cada08fc8a70 153 /** Call the attached static or member function
mbedAustin 11:cada08fc8a70 154 */
mbedAustin 11:cada08fc8a70 155 R call(A1 a){
mbedAustin 11:cada08fc8a70 156 if (_membercaller == 0 && _p.function) {
mbedAustin 11:cada08fc8a70 157 return _p.function(a);
mbedAustin 11:cada08fc8a70 158 } else if (_membercaller && _p.object) {
mbedAustin 11:cada08fc8a70 159 return _membercaller(_p.object, _member, a);
mbedAustin 11:cada08fc8a70 160 }
mbedAustin 11:cada08fc8a70 161 return (R)0;
mbedAustin 11:cada08fc8a70 162 }
mbedAustin 11:cada08fc8a70 163
mbedAustin 11:cada08fc8a70 164 typedef R (*static_fp)();
mbedAustin 11:cada08fc8a70 165 static_fp get_function() const {
mbedAustin 11:cada08fc8a70 166 return (R(*)())_p.function;
mbedAustin 11:cada08fc8a70 167 }
mbedAustin 11:cada08fc8a70 168
mbedAustin 11:cada08fc8a70 169 R operator ()(A1 a) {
mbedAustin 11:cada08fc8a70 170 return call(a);
mbedAustin 11:cada08fc8a70 171 }
mbedAustin 11:cada08fc8a70 172 operator bool(void)
mbedAustin 11:cada08fc8a70 173 {
mbedAustin 11:cada08fc8a70 174 void *q = &_p.function;
mbedAustin 11:cada08fc8a70 175 return (_membercaller != NULL) && _p.object != NULL && (*static_cast<void **>(q) != NULL);
mbedAustin 11:cada08fc8a70 176 }
mbedAustin 11:cada08fc8a70 177 private:
mbedAustin 11:cada08fc8a70 178 template<typename T>
mbedAustin 11:cada08fc8a70 179 static void membercaller(void *object, uintptr_t *member, A1 a) {
mbedAustin 11:cada08fc8a70 180 T* o = static_cast<T*>(object);
mbedAustin 11:cada08fc8a70 181 R (T::**m)(A1) = reinterpret_cast<R (T::**)(A1)>(member);
mbedAustin 11:cada08fc8a70 182 (o->**m)(a);
mbedAustin 11:cada08fc8a70 183 }
mbedAustin 11:cada08fc8a70 184
mbedAustin 11:cada08fc8a70 185 union {
mbedAustin 11:cada08fc8a70 186 R (*function)(A1); // static function pointer - 0 if none attached
mbedAustin 11:cada08fc8a70 187 void *object; // object this pointer - 0 if none attached
mbedAustin 11:cada08fc8a70 188 } _p;
mbedAustin 11:cada08fc8a70 189 uintptr_t _member[4]; // aligned raw member function pointer storage - converted back by registered _membercaller
mbedAustin 11:cada08fc8a70 190 R (*_membercaller)(void*, uintptr_t*, A1); // registered membercaller function to convert back and call _m.member on _object
mbedAustin 11:cada08fc8a70 191 };
mbedAustin 11:cada08fc8a70 192
mbedAustin 11:cada08fc8a70 193
mbedAustin 11:cada08fc8a70 194
mbedAustin 11:cada08fc8a70 195 typedef FP0<void> FP;
mbedAustin 11:cada08fc8a70 196
mbedAustin 11:cada08fc8a70 197 #endif