Varun Bahl / BahlDecrypModified

Updated

Fork of BLE_API by Bluetooth Low Energy

ble/CallChainOfFunctionPointersWithContext.h@1042:21a86ac7f5b1, 2016-01-11 (annotated)

Committer:
vcoubard
Date:
Mon Jan 11 08:51:25 2016 +0000
Revision:
1042:21a86ac7f5b1
Parent:
993:4d62b7967c11
Child:
1048:efb29faf12fc
Synchronized with git rev 582789ea

Author: Vincent Coubard

Add function template makeFunctionPointer wich help to create

FunctionPointerWithContext<ContextType> instances.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rgrover1 710:b2e1a2660ec2 1 /* mbed Microcontroller Library
rgrover1 710:b2e1a2660ec2 2 * Copyright (c) 2006-2013 ARM Limited
rgrover1 710:b2e1a2660ec2 3 *
rgrover1 710:b2e1a2660ec2 4 * Licensed under the Apache License, Version 2.0 (the "License");
rgrover1 710:b2e1a2660ec2 5 * you may not use this file except in compliance with the License.
rgrover1 710:b2e1a2660ec2 6 * You may obtain a copy of the License at
rgrover1 710:b2e1a2660ec2 7 *
rgrover1 710:b2e1a2660ec2 8 * http://www.apache.org/licenses/LICENSE-2.0
rgrover1 710:b2e1a2660ec2 9 *
rgrover1 710:b2e1a2660ec2 10 * Unless required by applicable law or agreed to in writing, software
rgrover1 710:b2e1a2660ec2 11 * distributed under the License is distributed on an "AS IS" BASIS,
rgrover1 710:b2e1a2660ec2 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rgrover1 710:b2e1a2660ec2 13 * See the License for the specific language governing permissions and
rgrover1 710:b2e1a2660ec2 14 * limitations under the License.
rgrover1 710:b2e1a2660ec2 15 */
rgrover1 710:b2e1a2660ec2 16 #ifndef MBED_CALLCHAIN_OF_FUNCTION_POINTERS_WITH_CONTEXT_H
rgrover1 710:b2e1a2660ec2 17 #define MBED_CALLCHAIN_OF_FUNCTION_POINTERS_WITH_CONTEXT_H
rgrover1 710:b2e1a2660ec2 18
rgrover1 710:b2e1a2660ec2 19 #include <string.h>
rgrover1 710:b2e1a2660ec2 20 #include "FunctionPointerWithContext.h"
rgrover1 710:b2e1a2660ec2 21
rgrover1 710:b2e1a2660ec2 22
rgrover1 710:b2e1a2660ec2 23 /** Group one or more functions in an instance of a CallChainOfFunctionPointersWithContext, then call them in
rgrover1 710:b2e1a2660ec2 24 * sequence using CallChainOfFunctionPointersWithContext::call(). Used mostly by the interrupt chaining code,
rgrover1 710:b2e1a2660ec2 25 * but can be used for other purposes.
rgrover1 710:b2e1a2660ec2 26 *
rgrover1 710:b2e1a2660ec2 27 * Example:
rgrover1 710:b2e1a2660ec2 28 * @code
rgrover1 710:b2e1a2660ec2 29 *
rgrover1 710:b2e1a2660ec2 30 * CallChainOfFunctionPointersWithContext<void *> chain;
rgrover1 710:b2e1a2660ec2 31 *
rgrover1 710:b2e1a2660ec2 32 * void first(void *context) {
rgrover1 710:b2e1a2660ec2 33 * printf("'first' function.\n");
rgrover1 710:b2e1a2660ec2 34 * }
rgrover1 710:b2e1a2660ec2 35 *
rgrover1 710:b2e1a2660ec2 36 * void second(void *context) {
rgrover1 710:b2e1a2660ec2 37 * printf("'second' function.\n");
rgrover1 710:b2e1a2660ec2 38 * }
rgrover1 710:b2e1a2660ec2 39 *
rgrover1 710:b2e1a2660ec2 40 * class Test {
rgrover1 710:b2e1a2660ec2 41 * public:
rgrover1 710:b2e1a2660ec2 42 * void f(void *context) {
rgrover1 710:b2e1a2660ec2 43 * printf("A::f (class member).\n");
rgrover1 710:b2e1a2660ec2 44 * }
rgrover1 710:b2e1a2660ec2 45 * };
rgrover1 710:b2e1a2660ec2 46 *
rgrover1 710:b2e1a2660ec2 47 * int main() {
rgrover1 710:b2e1a2660ec2 48 * Test test;
rgrover1 710:b2e1a2660ec2 49 *
rgrover1 710:b2e1a2660ec2 50 * chain.add(second);
rgrover1 710:b2e1a2660ec2 51 * chain.add_front(first);
rgrover1 710:b2e1a2660ec2 52 * chain.add(&test, &Test::f);
rgrover1 710:b2e1a2660ec2 53 * chain.call();
rgrover1 710:b2e1a2660ec2 54 * }
rgrover1 710:b2e1a2660ec2 55 * @endcode
rgrover1 710:b2e1a2660ec2 56 */
rgrover1 710:b2e1a2660ec2 57
rgrover1 710:b2e1a2660ec2 58 template <typename ContextType>
vcoubard 1042:21a86ac7f5b1 59 class CallChainOfFunctionPointersWithContext {
rgrover1 710:b2e1a2660ec2 60 public:
rgrover1 710:b2e1a2660ec2 61 typedef FunctionPointerWithContext<ContextType> *pFunctionPointerWithContext_t;
rgrover1 710:b2e1a2660ec2 62
rgrover1 710:b2e1a2660ec2 63 public:
vcoubard 1042:21a86ac7f5b1 64 /** Create an empty chain
rgrover1 710:b2e1a2660ec2 65 *
vcoubard 1042:21a86ac7f5b1 66 * @param size (optional) Initial size of the chain
rgrover1 710:b2e1a2660ec2 67 */
rgrover1 710:b2e1a2660ec2 68 CallChainOfFunctionPointersWithContext() : chainHead(NULL) {
rgrover1 710:b2e1a2660ec2 69 /* empty */
rgrover1 710:b2e1a2660ec2 70 }
rgrover1 710:b2e1a2660ec2 71
rgrover1 710:b2e1a2660ec2 72 virtual ~CallChainOfFunctionPointersWithContext() {
rgrover1 710:b2e1a2660ec2 73 clear();
rgrover1 710:b2e1a2660ec2 74 }
rgrover1 710:b2e1a2660ec2 75
vcoubard 1042:21a86ac7f5b1 76 /** Add a function at the front of the chain
rgrover1 710:b2e1a2660ec2 77 *
vcoubard 1042:21a86ac7f5b1 78 * @param function A pointer to a void function
rgrover1 710:b2e1a2660ec2 79 *
rgrover1 710:b2e1a2660ec2 80 * @returns
vcoubard 1042:21a86ac7f5b1 81 * The function object created for 'function'
rgrover1 710:b2e1a2660ec2 82 */
rgrover1 710:b2e1a2660ec2 83 pFunctionPointerWithContext_t add(void (*function)(ContextType context)) {
rgrover1 710:b2e1a2660ec2 84 return common_add(new FunctionPointerWithContext<ContextType>(function));
rgrover1 710:b2e1a2660ec2 85 }
rgrover1 710:b2e1a2660ec2 86
vcoubard 1042:21a86ac7f5b1 87 /** Add a function at the front of the chain
rgrover1 710:b2e1a2660ec2 88 *
vcoubard 1042:21a86ac7f5b1 89 * @param tptr pointer to the object to call the member function on
vcoubard 1042:21a86ac7f5b1 90 * @param mptr pointer to the member function to be called
rgrover1 710:b2e1a2660ec2 91 *
rgrover1 710:b2e1a2660ec2 92 * @returns
vcoubard 1042:21a86ac7f5b1 93 * The function object created for 'tptr' and 'mptr'
rgrover1 710:b2e1a2660ec2 94 */
rgrover1 710:b2e1a2660ec2 95 template<typename T>
rgrover1 710:b2e1a2660ec2 96 pFunctionPointerWithContext_t add(T *tptr, void (T::*mptr)(ContextType context)) {
rgrover1 710:b2e1a2660ec2 97 return common_add(new FunctionPointerWithContext<ContextType>(tptr, mptr));
rgrover1 710:b2e1a2660ec2 98 }
rgrover1 710:b2e1a2660ec2 99
rgrover1 710:b2e1a2660ec2 100 /** Clear the call chain (remove all functions in the chain).
rgrover1 710:b2e1a2660ec2 101 */
rgrover1 710:b2e1a2660ec2 102 void clear(void) {
rgrover1 710:b2e1a2660ec2 103 pFunctionPointerWithContext_t fptr = chainHead;
rgrover1 710:b2e1a2660ec2 104 while (fptr) {
rgrover1 710:b2e1a2660ec2 105 pFunctionPointerWithContext_t deadPtr = fptr;
rgrover1 710:b2e1a2660ec2 106 fptr = deadPtr->getNext();
rgrover1 710:b2e1a2660ec2 107 delete deadPtr;
rgrover1 710:b2e1a2660ec2 108 }
rgrover1 710:b2e1a2660ec2 109
rgrover1 710:b2e1a2660ec2 110 chainHead = NULL;
rgrover1 710:b2e1a2660ec2 111 }
rgrover1 710:b2e1a2660ec2 112
rgrover1 710:b2e1a2660ec2 113 bool hasCallbacksAttached(void) const {
rgrover1 710:b2e1a2660ec2 114 return (chainHead != NULL);
rgrover1 710:b2e1a2660ec2 115 }
rgrover1 710:b2e1a2660ec2 116
rgrover1 710:b2e1a2660ec2 117 /** Call all the functions in the chain in sequence
vcoubard 1042:21a86ac7f5b1 118 * @Note: the stack frames of all the callbacks within the chained
vcoubard 1042:21a86ac7f5b1 119 * FunctionPointers will stack up. Hopefully there won't be too many
vcoubard 1042:21a86ac7f5b1 120 * chained FunctionPointers.
rgrover1 710:b2e1a2660ec2 121 */
rgrover1 710:b2e1a2660ec2 122 void call(ContextType context) {
vcoubard 1042:21a86ac7f5b1 123 if (chainHead) {
vcoubard 1042:21a86ac7f5b1 124 chainHead->call(context);
rgrover1 953:f6eb43f524b2 125 }
rgrover1 953:f6eb43f524b2 126 }
rgrover1 953:f6eb43f524b2 127
rgrover1 710:b2e1a2660ec2 128 private:
rgrover1 710:b2e1a2660ec2 129 pFunctionPointerWithContext_t common_add(pFunctionPointerWithContext_t pf) {
rgrover1 710:b2e1a2660ec2 130 if (chainHead == NULL) {
rgrover1 710:b2e1a2660ec2 131 chainHead = pf;
rgrover1 710:b2e1a2660ec2 132 } else {
rgrover1 710:b2e1a2660ec2 133 pf->chainAsNext(chainHead);
rgrover1 710:b2e1a2660ec2 134 chainHead = pf;
rgrover1 710:b2e1a2660ec2 135 }
rgrover1 710:b2e1a2660ec2 136
rgrover1 710:b2e1a2660ec2 137 return chainHead;
rgrover1 710:b2e1a2660ec2 138 }
rgrover1 710:b2e1a2660ec2 139
rgrover1 710:b2e1a2660ec2 140 private:
rgrover1 710:b2e1a2660ec2 141 pFunctionPointerWithContext_t chainHead;
rgrover1 990:53ac0ac3aa39 142
vcoubard 1042:21a86ac7f5b1 143 /* disallow copy constructor and assignment operators */
rgrover1 710:b2e1a2660ec2 144 private:
rgrover1 710:b2e1a2660ec2 145 CallChainOfFunctionPointersWithContext(const CallChainOfFunctionPointersWithContext &);
rgrover1 710:b2e1a2660ec2 146 CallChainOfFunctionPointersWithContext & operator = (const CallChainOfFunctionPointersWithContext &);
rgrover1 710:b2e1a2660ec2 147 };
rgrover1 710:b2e1a2660ec2 148
rgrover1 710:b2e1a2660ec2 149 #endif