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BLE_API/public/CallChainOfFunctionPointersWithContext.h@2:3c406d25860e, 2015-02-20 (annotated)

Committer:
jksoft
Date:
Fri Feb 20 00:07:48 2015 +0000
Revision:
2:3c406d25860e
Parent:
0:76dfa9657d9d 
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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 #ifndef MBED_CALLCHAIN_OF_FUNCTION_POINTERS_WITH_CONTEXT_H
jksoft 0:76dfa9657d9d 17 #define MBED_CALLCHAIN_OF_FUNCTION_POINTERS_WITH_CONTEXT_H
jksoft 0:76dfa9657d9d 18
jksoft 0:76dfa9657d9d 19 #include <string.h>
jksoft 0:76dfa9657d9d 20 #include "FunctionPointerWithContext.h"
jksoft 0:76dfa9657d9d 21
jksoft 0:76dfa9657d9d 22 namespace mbed {
jksoft 0:76dfa9657d9d 23
jksoft 0:76dfa9657d9d 24 /** Group one or more functions in an instance of a CallChainOfFunctionPointersWithContext, then call them in
jksoft 0:76dfa9657d9d 25 * sequence using CallChainOfFunctionPointersWithContext::call(). Used mostly by the interrupt chaining code,
jksoft 0:76dfa9657d9d 26 * but can be used for other purposes.
jksoft 0:76dfa9657d9d 27 *
jksoft 0:76dfa9657d9d 28 * Example:
jksoft 0:76dfa9657d9d 29 * @code
jksoft 0:76dfa9657d9d 30 * #include "mbed.h"
jksoft 0:76dfa9657d9d 31 *
jksoft 0:76dfa9657d9d 32 * CallChainOfFunctionPointersWithContext<void *> chain;
jksoft 0:76dfa9657d9d 33 *
jksoft 0:76dfa9657d9d 34 * void first(void *context) {
jksoft 0:76dfa9657d9d 35 * printf("'first' function.\n");
jksoft 0:76dfa9657d9d 36 * }
jksoft 0:76dfa9657d9d 37 *
jksoft 0:76dfa9657d9d 38 * void second(void *context) {
jksoft 0:76dfa9657d9d 39 * printf("'second' function.\n");
jksoft 0:76dfa9657d9d 40 * }
jksoft 0:76dfa9657d9d 41 *
jksoft 0:76dfa9657d9d 42 * class Test {
jksoft 0:76dfa9657d9d 43 * public:
jksoft 0:76dfa9657d9d 44 * void f(void *context) {
jksoft 0:76dfa9657d9d 45 * printf("A::f (class member).\n");
jksoft 0:76dfa9657d9d 46 * }
jksoft 0:76dfa9657d9d 47 * };
jksoft 0:76dfa9657d9d 48 *
jksoft 0:76dfa9657d9d 49 * int main() {
jksoft 0:76dfa9657d9d 50 * Test test;
jksoft 0:76dfa9657d9d 51 *
jksoft 0:76dfa9657d9d 52 * chain.add(second);
jksoft 0:76dfa9657d9d 53 * chain.add_front(first);
jksoft 0:76dfa9657d9d 54 * chain.add(&test, &Test::f);
jksoft 0:76dfa9657d9d 55 * chain.call();
jksoft 0:76dfa9657d9d 56 * }
jksoft 0:76dfa9657d9d 57 * @endcode
jksoft 0:76dfa9657d9d 58 */
jksoft 0:76dfa9657d9d 59
jksoft 0:76dfa9657d9d 60 template <typename ContextType>
jksoft 0:76dfa9657d9d 61 class CallChainOfFunctionPointersWithContext {
jksoft 0:76dfa9657d9d 62 public:
jksoft 0:76dfa9657d9d 63 typedef FunctionPointerWithContext<ContextType>* pFunctionPointerWithContext_t;
jksoft 0:76dfa9657d9d 64
jksoft 0:76dfa9657d9d 65 public:
jksoft 0:76dfa9657d9d 66 /** Create an empty chain
jksoft 0:76dfa9657d9d 67 *
jksoft 0:76dfa9657d9d 68 * @param size (optional) Initial size of the chain
jksoft 0:76dfa9657d9d 69 */
jksoft 0:76dfa9657d9d 70 CallChainOfFunctionPointersWithContext() : chainHead(NULL) {
jksoft 0:76dfa9657d9d 71 /* empty */
jksoft 0:76dfa9657d9d 72 }
jksoft 0:76dfa9657d9d 73
jksoft 0:76dfa9657d9d 74 virtual ~CallChainOfFunctionPointersWithContext() {
jksoft 0:76dfa9657d9d 75 clear();
jksoft 0:76dfa9657d9d 76 }
jksoft 0:76dfa9657d9d 77
jksoft 0:76dfa9657d9d 78 /** Add a function at the front of the chain
jksoft 0:76dfa9657d9d 79 *
jksoft 0:76dfa9657d9d 80 * @param function A pointer to a void function
jksoft 0:76dfa9657d9d 81 *
jksoft 0:76dfa9657d9d 82 * @returns
jksoft 0:76dfa9657d9d 83 * The function object created for 'function'
jksoft 0:76dfa9657d9d 84 */
jksoft 0:76dfa9657d9d 85 pFunctionPointerWithContext_t add(void (*function)(ContextType context)) {
jksoft 0:76dfa9657d9d 86 return common_add(new FunctionPointerWithContext<ContextType>(function));
jksoft 0:76dfa9657d9d 87 }
jksoft 0:76dfa9657d9d 88
jksoft 0:76dfa9657d9d 89 /** Add a function at the front of the chain
jksoft 0:76dfa9657d9d 90 *
jksoft 0:76dfa9657d9d 91 * @param tptr pointer to the object to call the member function on
jksoft 0:76dfa9657d9d 92 * @param mptr pointer to the member function to be called
jksoft 0:76dfa9657d9d 93 *
jksoft 0:76dfa9657d9d 94 * @returns
jksoft 0:76dfa9657d9d 95 * The function object created for 'tptr' and 'mptr'
jksoft 0:76dfa9657d9d 96 */
jksoft 0:76dfa9657d9d 97 template<typename T>
jksoft 0:76dfa9657d9d 98 pFunctionPointerWithContext_t add(T *tptr, void (T::*mptr)(ContextType context)) {
jksoft 0:76dfa9657d9d 99 return common_add(new FunctionPointerWithContext<ContextType>(tptr, mptr));
jksoft 0:76dfa9657d9d 100 }
jksoft 0:76dfa9657d9d 101
jksoft 0:76dfa9657d9d 102 /** Clear the call chain (remove all functions in the chain).
jksoft 0:76dfa9657d9d 103 */
jksoft 0:76dfa9657d9d 104 void clear(void) {
jksoft 0:76dfa9657d9d 105 pFunctionPointerWithContext_t fptr = chainHead;
jksoft 0:76dfa9657d9d 106 while (fptr) {
jksoft 0:76dfa9657d9d 107 pFunctionPointerWithContext_t deadPtr = fptr;
jksoft 0:76dfa9657d9d 108 fptr = deadPtr->getNext();
jksoft 0:76dfa9657d9d 109 delete deadPtr;
jksoft 0:76dfa9657d9d 110 }
jksoft 0:76dfa9657d9d 111
jksoft 0:76dfa9657d9d 112 chainHead = NULL;
jksoft 0:76dfa9657d9d 113 }
jksoft 0:76dfa9657d9d 114
jksoft 0:76dfa9657d9d 115 bool hasCallbacksAttached(void) const {
jksoft 0:76dfa9657d9d 116 return (chainHead != NULL);
jksoft 0:76dfa9657d9d 117 }
jksoft 0:76dfa9657d9d 118
jksoft 0:76dfa9657d9d 119 /** Call all the functions in the chain in sequence
jksoft 0:76dfa9657d9d 120 * @Note: the stack frames of all the callbacks within the chained
jksoft 0:76dfa9657d9d 121 * FunctionPointers will stack up. Hopefully there won't be too many
jksoft 0:76dfa9657d9d 122 * chained FunctionPointers.
jksoft 0:76dfa9657d9d 123 */
jksoft 0:76dfa9657d9d 124 void call(ContextType context) {
jksoft 0:76dfa9657d9d 125 if (chainHead)
jksoft 0:76dfa9657d9d 126 chainHead->call(context);
jksoft 0:76dfa9657d9d 127 }
jksoft 0:76dfa9657d9d 128
jksoft 0:76dfa9657d9d 129 private:
jksoft 0:76dfa9657d9d 130 pFunctionPointerWithContext_t common_add(pFunctionPointerWithContext_t pf) {
jksoft 0:76dfa9657d9d 131 if (chainHead == NULL) {
jksoft 0:76dfa9657d9d 132 chainHead = pf;
jksoft 0:76dfa9657d9d 133 } else {
jksoft 0:76dfa9657d9d 134 pf->chainAsNext(chainHead);
jksoft 0:76dfa9657d9d 135 chainHead = pf;
jksoft 0:76dfa9657d9d 136 }
jksoft 0:76dfa9657d9d 137
jksoft 0:76dfa9657d9d 138 return chainHead;
jksoft 0:76dfa9657d9d 139 }
jksoft 0:76dfa9657d9d 140
jksoft 0:76dfa9657d9d 141 private:
jksoft 0:76dfa9657d9d 142 pFunctionPointerWithContext_t chainHead;
jksoft 0:76dfa9657d9d 143
jksoft 0:76dfa9657d9d 144 /* disallow copy constructor and assignment operators */
jksoft 0:76dfa9657d9d 145 private:
jksoft 0:76dfa9657d9d 146 CallChainOfFunctionPointersWithContext(const CallChainOfFunctionPointersWithContext &);
jksoft 0:76dfa9657d9d 147 CallChainOfFunctionPointersWithContext & operator = (const CallChainOfFunctionPointersWithContext &);
jksoft 0:76dfa9657d9d 148 };
jksoft 0:76dfa9657d9d 149
jksoft 0:76dfa9657d9d 150 } // namespace mbed
jksoft 0:76dfa9657d9d 151
jksoft 0:76dfa9657d9d 152 #endif
jksoft 0:76dfa9657d9d 153