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MQTT/FP/FP.h@11:278ba4de2e99, 2017-09-07 (annotated)

Committer:
jksoft
Date:
Thu Sep 07 01:26:48 2017 +0000
Revision:
11:278ba4de2e99
Parent:
0:0a2f634d3324 
???????(FP->_FP)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jksoft 0:0a2f634d3324 1 /**
jksoft 0:0a2f634d3324 2 * @file FP.h
jksoft 0:0a2f634d3324 3 * @brief Core Utility - Templated Function Pointer Class
jksoft 0:0a2f634d3324 4 * @author sam grove
jksoft 0:0a2f634d3324 5 * @version 1.1
jksoft 0:0a2f634d3324 6 * @see http://mbed.org/users/sam_grove/code/FP/
jksoft 0:0a2f634d3324 7 *
jksoft 0:0a2f634d3324 8 * Copyright (c) 2013
jksoft 0:0a2f634d3324 9 *
jksoft 0:0a2f634d3324 10 * Licensed under the Apache License, Version 2.0 (the "License");
jksoft 0:0a2f634d3324 11 * you may not use this file except in compliance with the License.
jksoft 0:0a2f634d3324 12 * You may obtain a copy of the License at
jksoft 0:0a2f634d3324 13 *
jksoft 0:0a2f634d3324 14 * http://www.apache.org/licenses/LICENSE-2.0
jksoft 0:0a2f634d3324 15 *
jksoft 0:0a2f634d3324 16 * Unless required by applicable law or agreed to in writing, software
jksoft 0:0a2f634d3324 17 * distributed under the License is distributed on an "AS IS" BASIS,
jksoft 0:0a2f634d3324 18 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
jksoft 0:0a2f634d3324 19 * See the License for the specific language governing permissions and
jksoft 0:0a2f634d3324 20 * limitations under the License.
jksoft 0:0a2f634d3324 21 */
jksoft 0:0a2f634d3324 22
jksoft 0:0a2f634d3324 23 #ifndef FP_H
jksoft 0:0a2f634d3324 24 #define FP_H
jksoft 0:0a2f634d3324 25
jksoft 0:0a2f634d3324 26 /** Example using the FP Class with global functions
jksoft 0:0a2f634d3324 27 * @code
jksoft 0:0a2f634d3324 28 * #include "mbed.h"
jksoft 0:0a2f634d3324 29 * #include "FP.h"
jksoft 0:0a2f634d3324 30 *
jksoft 0:0a2f634d3324 31 * FP<void,bool>fp;
jksoft 0:0a2f634d3324 32 * DigitalOut myled(LED1);
jksoft 0:0a2f634d3324 33 *
jksoft 0:0a2f634d3324 34 * void handler(bool value)
jksoft 0:0a2f634d3324 35 * {
jksoft 0:0a2f634d3324 36 * myled = value;
jksoft 0:0a2f634d3324 37 * return;
jksoft 0:0a2f634d3324 38 * }
jksoft 0:0a2f634d3324 39 *
jksoft 0:0a2f634d3324 40 * int main()
jksoft 0:0a2f634d3324 41 * {
jksoft 0:0a2f634d3324 42 * fp.attach(&handler);
jksoft 0:0a2f634d3324 43 *
jksoft 0:0a2f634d3324 44 * while(1)
jksoft 0:0a2f634d3324 45 * {
jksoft 0:0a2f634d3324 46 * fp(1);
jksoft 0:0a2f634d3324 47 * wait(0.2);
jksoft 0:0a2f634d3324 48 * fp(0);
jksoft 0:0a2f634d3324 49 * wait(0.2);
jksoft 0:0a2f634d3324 50 * }
jksoft 0:0a2f634d3324 51 * }
jksoft 0:0a2f634d3324 52 * @endcode
jksoft 0:0a2f634d3324 53 */
jksoft 0:0a2f634d3324 54
jksoft 0:0a2f634d3324 55 /** Example using the FP Class with different class member functions
jksoft 0:0a2f634d3324 56 * @code
jksoft 0:0a2f634d3324 57 * #include "mbed.h"
jksoft 0:0a2f634d3324 58 * #include "FP.h"
jksoft 0:0a2f634d3324 59 *
jksoft 0:0a2f634d3324 60 * FP<void,bool>fp;
jksoft 0:0a2f634d3324 61 * DigitalOut myled(LED4);
jksoft 0:0a2f634d3324 62 *
jksoft 0:0a2f634d3324 63 * class Wrapper
jksoft 0:0a2f634d3324 64 * {
jksoft 0:0a2f634d3324 65 * public:
jksoft 0:0a2f634d3324 66 * Wrapper(){}
jksoft 0:0a2f634d3324 67 *
jksoft 0:0a2f634d3324 68 * void handler(bool value)
jksoft 0:0a2f634d3324 69 * {
jksoft 0:0a2f634d3324 70 * myled = value;
jksoft 0:0a2f634d3324 71 * return;
jksoft 0:0a2f634d3324 72 * }
jksoft 0:0a2f634d3324 73 * };
jksoft 0:0a2f634d3324 74 *
jksoft 0:0a2f634d3324 75 * int main()
jksoft 0:0a2f634d3324 76 * {
jksoft 0:0a2f634d3324 77 * Wrapper wrapped;
jksoft 0:0a2f634d3324 78 * fp.attach(&wrapped, &Wrapper::handler);
jksoft 0:0a2f634d3324 79 *
jksoft 0:0a2f634d3324 80 * while(1)
jksoft 0:0a2f634d3324 81 * {
jksoft 0:0a2f634d3324 82 * fp(1);
jksoft 0:0a2f634d3324 83 * wait(0.2);
jksoft 0:0a2f634d3324 84 * fp(0);
jksoft 0:0a2f634d3324 85 * wait(0.2);
jksoft 0:0a2f634d3324 86 * }
jksoft 0:0a2f634d3324 87 * }
jksoft 0:0a2f634d3324 88 * @endcode
jksoft 0:0a2f634d3324 89 */
jksoft 0:0a2f634d3324 90
jksoft 0:0a2f634d3324 91 /** Example using the FP Class with member FP and member function
jksoft 0:0a2f634d3324 92 * @code
jksoft 0:0a2f634d3324 93 * #include "mbed.h"
jksoft 0:0a2f634d3324 94 * #include "FP.h"
jksoft 0:0a2f634d3324 95 *
jksoft 0:0a2f634d3324 96 * DigitalOut myled(LED2);
jksoft 0:0a2f634d3324 97 *
jksoft 0:0a2f634d3324 98 * class Wrapper
jksoft 0:0a2f634d3324 99 * {
jksoft 0:0a2f634d3324 100 * public:
jksoft 0:0a2f634d3324 101 * Wrapper()
jksoft 0:0a2f634d3324 102 * {
jksoft 0:0a2f634d3324 103 * fp.attach(this, &Wrapper::handler);
jksoft 0:0a2f634d3324 104 * }
jksoft 0:0a2f634d3324 105 *
jksoft 0:0a2f634d3324 106 * void handler(bool value)
jksoft 0:0a2f634d3324 107 * {
jksoft 0:0a2f634d3324 108 * myled = value;
jksoft 0:0a2f634d3324 109 * return;
jksoft 0:0a2f634d3324 110 * }
jksoft 0:0a2f634d3324 111 *
jksoft 0:0a2f634d3324 112 * FP<void,bool>fp;
jksoft 0:0a2f634d3324 113 * };
jksoft 0:0a2f634d3324 114 *
jksoft 0:0a2f634d3324 115 * int main()
jksoft 0:0a2f634d3324 116 * {
jksoft 0:0a2f634d3324 117 * Wrapper wrapped;
jksoft 0:0a2f634d3324 118 *
jksoft 0:0a2f634d3324 119 * while(1)
jksoft 0:0a2f634d3324 120 * {
jksoft 0:0a2f634d3324 121 * wrapped.fp(1);
jksoft 0:0a2f634d3324 122 * wait(0.2);
jksoft 0:0a2f634d3324 123 * wrapped.fp(0);
jksoft 0:0a2f634d3324 124 * wait(0.2);
jksoft 0:0a2f634d3324 125 * }
jksoft 0:0a2f634d3324 126 * }
jksoft 0:0a2f634d3324 127 * @endcode
jksoft 0:0a2f634d3324 128 */
jksoft 0:0a2f634d3324 129
jksoft 0:0a2f634d3324 130 /**
jksoft 0:0a2f634d3324 131 * @class FP
jksoft 0:0a2f634d3324 132 * @brief API for managing Function Pointers
jksoft 0:0a2f634d3324 133 */
jksoft 0:0a2f634d3324 134 template<class retT, class argT>
jksoft 11:278ba4de2e99 135 class _FP
jksoft 0:0a2f634d3324 136 {
jksoft 0:0a2f634d3324 137 public:
jksoft 0:0a2f634d3324 138 /** Create the FP object - only one callback can be attached to the object, that is
jksoft 0:0a2f634d3324 139 * a member function or a global function, not both at the same time
jksoft 0:0a2f634d3324 140 */
jksoft 11:278ba4de2e99 141 _FP()
jksoft 0:0a2f634d3324 142 {
jksoft 0:0a2f634d3324 143 obj_callback = 0;
jksoft 0:0a2f634d3324 144 c_callback = 0;
jksoft 0:0a2f634d3324 145 }
jksoft 0:0a2f634d3324 146
jksoft 0:0a2f634d3324 147 /** Add a callback function to the object
jksoft 0:0a2f634d3324 148 * @param item - Address of the initialized object
jksoft 0:0a2f634d3324 149 * @param member - Address of the member function (dont forget the scope that the function is defined in)
jksoft 0:0a2f634d3324 150 */
jksoft 0:0a2f634d3324 151 template<class T>
jksoft 0:0a2f634d3324 152 void attach(T *item, retT (T::*method)(argT))
jksoft 0:0a2f634d3324 153 {
jksoft 0:0a2f634d3324 154 obj_callback = (FPtrDummy *)(item);
jksoft 0:0a2f634d3324 155 method_callback = (retT (FPtrDummy::*)(argT))(method);
jksoft 0:0a2f634d3324 156 return;
jksoft 0:0a2f634d3324 157 }
jksoft 0:0a2f634d3324 158
jksoft 0:0a2f634d3324 159 /** Add a callback function to the object
jksoft 0:0a2f634d3324 160 * @param function - The address of a globally defined function
jksoft 0:0a2f634d3324 161 */
jksoft 0:0a2f634d3324 162 void attach(retT (*function)(argT))
jksoft 0:0a2f634d3324 163 {
jksoft 0:0a2f634d3324 164 c_callback = function;
jksoft 0:0a2f634d3324 165 }
jksoft 0:0a2f634d3324 166
jksoft 0:0a2f634d3324 167 /** Invoke the function attached to the class
jksoft 0:0a2f634d3324 168 * @param arg - An argument that is passed into the function handler that is called
jksoft 0:0a2f634d3324 169 * @return The return from the function hanlder called by this class
jksoft 0:0a2f634d3324 170 */
jksoft 0:0a2f634d3324 171 retT operator()(argT arg) const
jksoft 0:0a2f634d3324 172 {
jksoft 0:0a2f634d3324 173 if( 0 != c_callback ) {
jksoft 0:0a2f634d3324 174 return obj_callback ? (obj_callback->*method_callback)(arg) : (*c_callback)(arg);
jksoft 0:0a2f634d3324 175 }
jksoft 0:0a2f634d3324 176 return (retT)0;
jksoft 0:0a2f634d3324 177 }
jksoft 0:0a2f634d3324 178
jksoft 0:0a2f634d3324 179 /** Determine if an callback is currently hooked
jksoft 0:0a2f634d3324 180 * @return 1 if a method is hooked, 0 otherwise
jksoft 0:0a2f634d3324 181 */
jksoft 0:0a2f634d3324 182 bool attached()
jksoft 0:0a2f634d3324 183 {
jksoft 0:0a2f634d3324 184 return obj_callback || c_callback;
jksoft 0:0a2f634d3324 185 }
jksoft 0:0a2f634d3324 186
jksoft 0:0a2f634d3324 187 /** Release a function from the callback hook
jksoft 0:0a2f634d3324 188 */
jksoft 0:0a2f634d3324 189 void detach()
jksoft 0:0a2f634d3324 190 {
jksoft 0:0a2f634d3324 191 obj_callback = 0;
jksoft 0:0a2f634d3324 192 c_callback = 0;
jksoft 0:0a2f634d3324 193 }
jksoft 0:0a2f634d3324 194
jksoft 0:0a2f634d3324 195 private:
jksoft 0:0a2f634d3324 196
jksoft 0:0a2f634d3324 197 // empty type used for casting
jksoft 0:0a2f634d3324 198 class FPtrDummy;
jksoft 0:0a2f634d3324 199
jksoft 0:0a2f634d3324 200 FPtrDummy *obj_callback;
jksoft 0:0a2f634d3324 201
jksoft 0:0a2f634d3324 202 /**
jksoft 0:0a2f634d3324 203 * @union Funciton
jksoft 0:0a2f634d3324 204 * @brief Member or global callback function
jksoft 0:0a2f634d3324 205 */
jksoft 0:0a2f634d3324 206 union {
jksoft 0:0a2f634d3324 207 retT (*c_callback)(argT); /*!< Footprint for a global function */
jksoft 0:0a2f634d3324 208 retT (FPtrDummy::*method_callback)(argT); /*!< Footprint for a member function */
jksoft 0:0a2f634d3324 209 };
jksoft 0:0a2f634d3324 210 };
jksoft 0:0a2f634d3324 211
jksoft 0:0a2f634d3324 212 #endif