kushagra brahmbhatt / IoT_Security

IoT Home Alarm System

Dependents:   IoTBurglar_and_Fire_AlarmSystem

FunctionPointer.h@0:2f388b030837, 2016-04-29 (annotated)

Committer:
kbrahmbhatt6
Date:
Fri Apr 29 06:59:59 2016 +0000
Revision:
0:2f388b030837
1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kbrahmbhatt6 0:2f388b030837 1 /* mbed Microcontroller Library
kbrahmbhatt6 0:2f388b030837 2 * Copyright (c) 2006-2013 ARM Limited
kbrahmbhatt6 0:2f388b030837 3 *
kbrahmbhatt6 0:2f388b030837 4 * Licensed under the Apache License, Version 2.0 (the "License");
kbrahmbhatt6 0:2f388b030837 5 * you may not use this file except in compliance with the License.
kbrahmbhatt6 0:2f388b030837 6 * You may obtain a copy of the License at
kbrahmbhatt6 0:2f388b030837 7 *
kbrahmbhatt6 0:2f388b030837 8 * http://www.apache.org/licenses/LICENSE-2.0
kbrahmbhatt6 0:2f388b030837 9 *
kbrahmbhatt6 0:2f388b030837 10 * Unless required by applicable law or agreed to in writing, software
kbrahmbhatt6 0:2f388b030837 11 * distributed under the License is distributed on an "AS IS" BASIS,
kbrahmbhatt6 0:2f388b030837 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kbrahmbhatt6 0:2f388b030837 13 * See the License for the specific language governing permissions and
kbrahmbhatt6 0:2f388b030837 14 * limitations under the License.
kbrahmbhatt6 0:2f388b030837 15 */
kbrahmbhatt6 0:2f388b030837 16 #ifndef MBED_FUNCTIONPOINTER_H
kbrahmbhatt6 0:2f388b030837 17 #define MBED_FUNCTIONPOINTER_H
kbrahmbhatt6 0:2f388b030837 18
kbrahmbhatt6 0:2f388b030837 19 #include <string.h>
kbrahmbhatt6 0:2f388b030837 20
kbrahmbhatt6 0:2f388b030837 21 namespace mbed {
kbrahmbhatt6 0:2f388b030837 22
kbrahmbhatt6 0:2f388b030837 23 typedef void (*pvoidf_t)(void);
kbrahmbhatt6 0:2f388b030837 24
kbrahmbhatt6 0:2f388b030837 25 /** A class for storing and calling a pointer to a static or member void function
kbrahmbhatt6 0:2f388b030837 26 */
kbrahmbhatt6 0:2f388b030837 27 class FunctionPointer {
kbrahmbhatt6 0:2f388b030837 28 public:
kbrahmbhatt6 0:2f388b030837 29
kbrahmbhatt6 0:2f388b030837 30 /** Create a FunctionPointer, attaching a static function
kbrahmbhatt6 0:2f388b030837 31 *
kbrahmbhatt6 0:2f388b030837 32 * @param function The void static function to attach (default is none)
kbrahmbhatt6 0:2f388b030837 33 */
kbrahmbhatt6 0:2f388b030837 34 FunctionPointer(void (*function)(void) = 0);
kbrahmbhatt6 0:2f388b030837 35
kbrahmbhatt6 0:2f388b030837 36 /** Create a FunctionPointer, attaching a member function
kbrahmbhatt6 0:2f388b030837 37 *
kbrahmbhatt6 0:2f388b030837 38 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
kbrahmbhatt6 0:2f388b030837 39 * @param function The address of the void member function to attach
kbrahmbhatt6 0:2f388b030837 40 */
kbrahmbhatt6 0:2f388b030837 41 template<typename T>
kbrahmbhatt6 0:2f388b030837 42 FunctionPointer(T *object, void (T::*member)(void)) {
kbrahmbhatt6 0:2f388b030837 43 attach(object, member);
kbrahmbhatt6 0:2f388b030837 44 }
kbrahmbhatt6 0:2f388b030837 45
kbrahmbhatt6 0:2f388b030837 46 /** Attach a static function
kbrahmbhatt6 0:2f388b030837 47 *
kbrahmbhatt6 0:2f388b030837 48 * @param function The void static function to attach (default is none)
kbrahmbhatt6 0:2f388b030837 49 */
kbrahmbhatt6 0:2f388b030837 50 void attach(void (*function)(void) = 0);
kbrahmbhatt6 0:2f388b030837 51
kbrahmbhatt6 0:2f388b030837 52 /** Attach a member function
kbrahmbhatt6 0:2f388b030837 53 *
kbrahmbhatt6 0:2f388b030837 54 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
kbrahmbhatt6 0:2f388b030837 55 * @param function The address of the void member function to attach
kbrahmbhatt6 0:2f388b030837 56 */
kbrahmbhatt6 0:2f388b030837 57 template<typename T>
kbrahmbhatt6 0:2f388b030837 58 void attach(T *object, void (T::*member)(void)) {
kbrahmbhatt6 0:2f388b030837 59 _object = static_cast<void*>(object);
kbrahmbhatt6 0:2f388b030837 60 memcpy(_member, (char*)&member, sizeof(member));
kbrahmbhatt6 0:2f388b030837 61 _membercaller = &FunctionPointer::membercaller<T>;
kbrahmbhatt6 0:2f388b030837 62 _function = 0;
kbrahmbhatt6 0:2f388b030837 63 }
kbrahmbhatt6 0:2f388b030837 64
kbrahmbhatt6 0:2f388b030837 65 /** Call the attached static or member function
kbrahmbhatt6 0:2f388b030837 66 */
kbrahmbhatt6 0:2f388b030837 67 void call();
kbrahmbhatt6 0:2f388b030837 68
kbrahmbhatt6 0:2f388b030837 69 pvoidf_t get_function() const {
kbrahmbhatt6 0:2f388b030837 70 return (pvoidf_t)_function;
kbrahmbhatt6 0:2f388b030837 71 }
kbrahmbhatt6 0:2f388b030837 72
kbrahmbhatt6 0:2f388b030837 73 #ifdef MBED_OPERATORS
kbrahmbhatt6 0:2f388b030837 74 void operator ()(void);
kbrahmbhatt6 0:2f388b030837 75 #endif
kbrahmbhatt6 0:2f388b030837 76
kbrahmbhatt6 0:2f388b030837 77 private:
kbrahmbhatt6 0:2f388b030837 78 template<typename T>
kbrahmbhatt6 0:2f388b030837 79 static void membercaller(void *object, char *member) {
kbrahmbhatt6 0:2f388b030837 80 T* o = static_cast<T*>(object);
kbrahmbhatt6 0:2f388b030837 81 void (T::*m)(void);
kbrahmbhatt6 0:2f388b030837 82 memcpy((char*)&m, member, sizeof(m));
kbrahmbhatt6 0:2f388b030837 83 (o->*m)();
kbrahmbhatt6 0:2f388b030837 84 }
kbrahmbhatt6 0:2f388b030837 85
kbrahmbhatt6 0:2f388b030837 86 void (*_function)(void); // static function pointer - 0 if none attached
kbrahmbhatt6 0:2f388b030837 87 void *_object; // object this pointer - 0 if none attached
kbrahmbhatt6 0:2f388b030837 88 char _member[16]; // raw member function pointer storage - converted back by registered _membercaller
kbrahmbhatt6 0:2f388b030837 89 void (*_membercaller)(void*, char*); // registered membercaller function to convert back and call _member on _object
kbrahmbhatt6 0:2f388b030837 90 };
kbrahmbhatt6 0:2f388b030837 91
kbrahmbhatt6 0:2f388b030837 92 } // namespace mbed
kbrahmbhatt6 0:2f388b030837 93
kbrahmbhatt6 0:2f388b030837 94 #endif