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BLE_API/public/FunctionPointerWithContext.h@0:76dfa9657d9d, 2014-11-12 (annotated)

Committer:
jksoft
Date:
Wed Nov 12 02:40:34 2014 +0000
Revision:
0:76dfa9657d9d
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Who changed what in which revision?

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jksoft 0:76dfa9657d9d 1 /* mbed Microcontroller Library
jksoft 0:76dfa9657d9d 2 * Copyright (c) 2006-2013 ARM Limited
jksoft 0:76dfa9657d9d 3 *
jksoft 0:76dfa9657d9d 4 * Licensed under the Apache License, Version 2.0 (the "License");
jksoft 0:76dfa9657d9d 5 * you may not use this file except in compliance with the License.
jksoft 0:76dfa9657d9d 6 * You may obtain a copy of the License at
jksoft 0:76dfa9657d9d 7 *
jksoft 0:76dfa9657d9d 8 * http://www.apache.org/licenses/LICENSE-2.0
jksoft 0:76dfa9657d9d 9 *
jksoft 0:76dfa9657d9d 10 * Unless required by applicable law or agreed to in writing, software
jksoft 0:76dfa9657d9d 11 * distributed under the License is distributed on an "AS IS" BASIS,
jksoft 0:76dfa9657d9d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
jksoft 0:76dfa9657d9d 13 * See the License for the specific language governing permissions and
jksoft 0:76dfa9657d9d 14 * limitations under the License.
jksoft 0:76dfa9657d9d 15 */
jksoft 0:76dfa9657d9d 16
jksoft 0:76dfa9657d9d 17 #ifndef MBED_FUNCTIONPOINTER_WITH_CONTEXT_H
jksoft 0:76dfa9657d9d 18 #define MBED_FUNCTIONPOINTER_WITH_CONTEXT_H
jksoft 0:76dfa9657d9d 19
jksoft 0:76dfa9657d9d 20 #include <string.h>
jksoft 0:76dfa9657d9d 21
jksoft 0:76dfa9657d9d 22 namespace mbed {
jksoft 0:76dfa9657d9d 23
jksoft 0:76dfa9657d9d 24 /** A class for storing and calling a pointer to a static or member void function
jksoft 0:76dfa9657d9d 25 * which takes a context.
jksoft 0:76dfa9657d9d 26 */
jksoft 0:76dfa9657d9d 27 template <typename ContextType>
jksoft 0:76dfa9657d9d 28 class FunctionPointerWithContext {
jksoft 0:76dfa9657d9d 29 public:
jksoft 0:76dfa9657d9d 30 typedef FunctionPointerWithContext<ContextType> *pFunctionPointerWithContext_t;
jksoft 0:76dfa9657d9d 31 typedef void (*pvoidfcontext_t)(ContextType context);
jksoft 0:76dfa9657d9d 32
jksoft 0:76dfa9657d9d 33 /** Create a FunctionPointerWithContext, attaching a static function
jksoft 0:76dfa9657d9d 34 *
jksoft 0:76dfa9657d9d 35 * @param function The void static function to attach (default is none)
jksoft 0:76dfa9657d9d 36 */
jksoft 0:76dfa9657d9d 37 FunctionPointerWithContext(void (*function)(ContextType context) = NULL) :
jksoft 0:76dfa9657d9d 38 _function(NULL), _object(NULL), _member(), _membercaller(NULL), _next(NULL) {
jksoft 0:76dfa9657d9d 39 attach(function);
jksoft 0:76dfa9657d9d 40 }
jksoft 0:76dfa9657d9d 41
jksoft 0:76dfa9657d9d 42 /** Create a FunctionPointerWithContext, attaching a member function
jksoft 0:76dfa9657d9d 43 *
jksoft 0:76dfa9657d9d 44 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
jksoft 0:76dfa9657d9d 45 * @param function The address of the void member function to attach
jksoft 0:76dfa9657d9d 46 */
jksoft 0:76dfa9657d9d 47 template<typename T>
jksoft 0:76dfa9657d9d 48 FunctionPointerWithContext(T *object, void (T::*member)(ContextType context)) :
jksoft 0:76dfa9657d9d 49 _function(NULL), _object(NULL), _member(), _membercaller(NULL), _next(NULL) {
jksoft 0:76dfa9657d9d 50 attach(object, member);
jksoft 0:76dfa9657d9d 51 }
jksoft 0:76dfa9657d9d 52
jksoft 0:76dfa9657d9d 53 /** Attach a static function
jksoft 0:76dfa9657d9d 54 *
jksoft 0:76dfa9657d9d 55 * @param function The void static function to attach (default is none)
jksoft 0:76dfa9657d9d 56 */
jksoft 0:76dfa9657d9d 57 void attach(void (*function)(ContextType context) = NULL) {
jksoft 0:76dfa9657d9d 58 _function = function;
jksoft 0:76dfa9657d9d 59 }
jksoft 0:76dfa9657d9d 60
jksoft 0:76dfa9657d9d 61 /** Attach a member function
jksoft 0:76dfa9657d9d 62 *
jksoft 0:76dfa9657d9d 63 * @param object The object pointer to invoke the member function on (i.e. the this pointer)
jksoft 0:76dfa9657d9d 64 * @param function The address of the void member function to attach
jksoft 0:76dfa9657d9d 65 */
jksoft 0:76dfa9657d9d 66 template<typename T>
jksoft 0:76dfa9657d9d 67 void attach(T *object, void (T::*member)(ContextType context)) {
jksoft 0:76dfa9657d9d 68 _object = static_cast<void *>(object);
jksoft 0:76dfa9657d9d 69 memcpy(_member, (char *)&member, sizeof(member));
jksoft 0:76dfa9657d9d 70 _membercaller = &FunctionPointerWithContext::membercaller<T>;
jksoft 0:76dfa9657d9d 71 }
jksoft 0:76dfa9657d9d 72
jksoft 0:76dfa9657d9d 73 /** Call the attached static or member function; and if there are chained
jksoft 0:76dfa9657d9d 74 * FunctionPointers their callbacks are invoked as well.
jksoft 0:76dfa9657d9d 75 * @Note: all chained callbacks stack up; so hopefully there won't be too
jksoft 0:76dfa9657d9d 76 * many FunctionPointers in a chain. */
jksoft 0:76dfa9657d9d 77 void call(ContextType context) {
jksoft 0:76dfa9657d9d 78 if (_function) {
jksoft 0:76dfa9657d9d 79 _function(context);
jksoft 0:76dfa9657d9d 80 } else if (_object && _membercaller) {
jksoft 0:76dfa9657d9d 81 _membercaller(_object, _member, context);
jksoft 0:76dfa9657d9d 82 }
jksoft 0:76dfa9657d9d 83
jksoft 0:76dfa9657d9d 84 /* Propagate the call to next in the chain. */
jksoft 0:76dfa9657d9d 85 if (_next) {
jksoft 0:76dfa9657d9d 86 _next->call(context);
jksoft 0:76dfa9657d9d 87 }
jksoft 0:76dfa9657d9d 88 }
jksoft 0:76dfa9657d9d 89
jksoft 0:76dfa9657d9d 90 /**
jksoft 0:76dfa9657d9d 91 * Setup an external FunctionPointer as a next in the chain of related
jksoft 0:76dfa9657d9d 92 * callbacks. Invoking call() on the head FunctionPointer will invoke all
jksoft 0:76dfa9657d9d 93 * chained callbacks.
jksoft 0:76dfa9657d9d 94 *
jksoft 0:76dfa9657d9d 95 * Refer to 'CallChain' as an alternative.
jksoft 0:76dfa9657d9d 96 */
jksoft 0:76dfa9657d9d 97 void chainAsNext(pFunctionPointerWithContext_t next) {
jksoft 0:76dfa9657d9d 98 _next = next;
jksoft 0:76dfa9657d9d 99 }
jksoft 0:76dfa9657d9d 100
jksoft 0:76dfa9657d9d 101 pFunctionPointerWithContext_t getNext(void) const {
jksoft 0:76dfa9657d9d 102 return _next;
jksoft 0:76dfa9657d9d 103 }
jksoft 0:76dfa9657d9d 104
jksoft 0:76dfa9657d9d 105 pvoidfcontext_t get_function() const {
jksoft 0:76dfa9657d9d 106 return (pvoidfcontext_t)_function;
jksoft 0:76dfa9657d9d 107 }
jksoft 0:76dfa9657d9d 108
jksoft 0:76dfa9657d9d 109 private:
jksoft 0:76dfa9657d9d 110 template<typename T>
jksoft 0:76dfa9657d9d 111 static void membercaller(void *object, char *member, ContextType context) {
jksoft 0:76dfa9657d9d 112 T *o = static_cast<T *>(object);
jksoft 0:76dfa9657d9d 113 void (T::*m)(ContextType);
jksoft 0:76dfa9657d9d 114 memcpy((char *)&m, member, sizeof(m));
jksoft 0:76dfa9657d9d 115 (o->*m)(context);
jksoft 0:76dfa9657d9d 116 }
jksoft 0:76dfa9657d9d 117
jksoft 0:76dfa9657d9d 118 void (*_function)(ContextType context); /**< static function pointer - NULL if none attached */
jksoft 0:76dfa9657d9d 119 void *_object; /**< object this pointer - NULL if none attached */
jksoft 0:76dfa9657d9d 120 char _member[16]; /**< raw member function pointer storage - converted back by
jksoft 0:76dfa9657d9d 121 * registered _membercaller */
jksoft 0:76dfa9657d9d 122 void (*_membercaller)(void *, char *, ContextType); /**< registered membercaller function to convert back and call
jksoft 0:76dfa9657d9d 123 * _member on _object passing the context. */
jksoft 0:76dfa9657d9d 124 pFunctionPointerWithContext_t _next; /**< Optional link to make a chain out of functionPointers; this
jksoft 0:76dfa9657d9d 125 * allows chaining function pointers without requiring
jksoft 0:76dfa9657d9d 126 * external memory to manage the chain. Also refer to
jksoft 0:76dfa9657d9d 127 * 'CallChain' as an alternative. */
jksoft 0:76dfa9657d9d 128 };
jksoft 0:76dfa9657d9d 129 } // namespace mbed
jksoft 0:76dfa9657d9d 130
jksoft 0:76dfa9657d9d 131 #endif // ifndef MBED_FUNCTIONPOINTER_WITH_CONTEXT_H