Philip Holifield / microbit-dal

from bbc microbit library

Dependencies:   BLE_API mbed-dev-bin nRF51822

Dependents:   microbit

Fork of microbit-dal by Lancaster University

inc/core/MemberFunctionCallback.h@75:c700add33ba5, 2018-01-11 (annotated)

Committer:
euxton
Date:
Thu Jan 11 21:54:30 2018 +0000
Revision:
75:c700add33ba5
Parent:
1:8aa5cdb4ab67 
1st commit

Who changed what in which revision?

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Jonathan Austin 1:8aa5cdb4ab67 1 /*
Jonathan Austin 1:8aa5cdb4ab67 2 The MIT License (MIT)
Jonathan Austin 1:8aa5cdb4ab67 3
Jonathan Austin 1:8aa5cdb4ab67 4 Copyright (c) 2016 British Broadcasting Corporation.
Jonathan Austin 1:8aa5cdb4ab67 5 This software is provided by Lancaster University by arrangement with the BBC.
Jonathan Austin 1:8aa5cdb4ab67 6
Jonathan Austin 1:8aa5cdb4ab67 7 Permission is hereby granted, free of charge, to any person obtaining a
Jonathan Austin 1:8aa5cdb4ab67 8 copy of this software and associated documentation files (the "Software"),
Jonathan Austin 1:8aa5cdb4ab67 9 to deal in the Software without restriction, including without limitation
Jonathan Austin 1:8aa5cdb4ab67 10 the rights to use, copy, modify, merge, publish, distribute, sublicense,
Jonathan Austin 1:8aa5cdb4ab67 11 and/or sell copies of the Software, and to permit persons to whom the
Jonathan Austin 1:8aa5cdb4ab67 12 Software is furnished to do so, subject to the following conditions:
Jonathan Austin 1:8aa5cdb4ab67 13
Jonathan Austin 1:8aa5cdb4ab67 14 The above copyright notice and this permission notice shall be included in
Jonathan Austin 1:8aa5cdb4ab67 15 all copies or substantial portions of the Software.
Jonathan Austin 1:8aa5cdb4ab67 16
Jonathan Austin 1:8aa5cdb4ab67 17 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
Jonathan Austin 1:8aa5cdb4ab67 18 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
Jonathan Austin 1:8aa5cdb4ab67 19 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
Jonathan Austin 1:8aa5cdb4ab67 20 THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 21 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
Jonathan Austin 1:8aa5cdb4ab67 22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
Jonathan Austin 1:8aa5cdb4ab67 23 DEALINGS IN THE SOFTWARE.
Jonathan Austin 1:8aa5cdb4ab67 24 */
Jonathan Austin 1:8aa5cdb4ab67 25
Jonathan Austin 1:8aa5cdb4ab67 26 #ifndef MEMBER_FUNCTION_CALLBACK_H
Jonathan Austin 1:8aa5cdb4ab67 27 #define MEMBER_FUNCTION_CALLBACK_H
Jonathan Austin 1:8aa5cdb4ab67 28
Jonathan Austin 1:8aa5cdb4ab67 29 #include "mbed.h"
Jonathan Austin 1:8aa5cdb4ab67 30 #include "MicroBitConfig.h"
Jonathan Austin 1:8aa5cdb4ab67 31 #include "MicroBitEvent.h"
Jonathan Austin 1:8aa5cdb4ab67 32 #include "MicroBitCompat.h"
Jonathan Austin 1:8aa5cdb4ab67 33
Jonathan Austin 1:8aa5cdb4ab67 34 /**
Jonathan Austin 1:8aa5cdb4ab67 35 * Class definition for a MemberFunctionCallback.
Jonathan Austin 1:8aa5cdb4ab67 36 *
Jonathan Austin 1:8aa5cdb4ab67 37 * C++ member functions (also known as methods) have a more complex
Jonathan Austin 1:8aa5cdb4ab67 38 * representation than normal C functions. This class allows a reference to
Jonathan Austin 1:8aa5cdb4ab67 39 * a C++ member function to be stored then called at a later date.
Jonathan Austin 1:8aa5cdb4ab67 40 *
Jonathan Austin 1:8aa5cdb4ab67 41 * This class is used extensively by the MicroBitMessageBus to deliver
Jonathan Austin 1:8aa5cdb4ab67 42 * events to C++ methods.
Jonathan Austin 1:8aa5cdb4ab67 43 */
Jonathan Austin 1:8aa5cdb4ab67 44 class MemberFunctionCallback
Jonathan Austin 1:8aa5cdb4ab67 45 {
Jonathan Austin 1:8aa5cdb4ab67 46 private:
Jonathan Austin 1:8aa5cdb4ab67 47 void* object;
Jonathan Austin 1:8aa5cdb4ab67 48 uint32_t method[4];
Jonathan Austin 1:8aa5cdb4ab67 49 void (*invoke)(void *object, uint32_t *method, MicroBitEvent e);
Jonathan Austin 1:8aa5cdb4ab67 50 template <typename T> static void methodCall(void* object, uint32_t*method, MicroBitEvent e);
Jonathan Austin 1:8aa5cdb4ab67 51
Jonathan Austin 1:8aa5cdb4ab67 52 public:
Jonathan Austin 1:8aa5cdb4ab67 53
Jonathan Austin 1:8aa5cdb4ab67 54 /**
Jonathan Austin 1:8aa5cdb4ab67 55 * Constructor. Creates a MemberFunctionCallback based on a pointer to given method.
Jonathan Austin 1:8aa5cdb4ab67 56 *
Jonathan Austin 1:8aa5cdb4ab67 57 * @param object The object the callback method should be invooked on.
Jonathan Austin 1:8aa5cdb4ab67 58 *
Jonathan Austin 1:8aa5cdb4ab67 59 * @param method The method to invoke.
Jonathan Austin 1:8aa5cdb4ab67 60 */
Jonathan Austin 1:8aa5cdb4ab67 61 template <typename T> MemberFunctionCallback(T* object, void (T::*method)(MicroBitEvent e));
Jonathan Austin 1:8aa5cdb4ab67 62
Jonathan Austin 1:8aa5cdb4ab67 63 /**
Jonathan Austin 1:8aa5cdb4ab67 64 * A comparison of two MemberFunctionCallback objects.
Jonathan Austin 1:8aa5cdb4ab67 65 *
Jonathan Austin 1:8aa5cdb4ab67 66 * @return true if the given MemberFunctionCallback is equivalent to this one, false otherwise.
Jonathan Austin 1:8aa5cdb4ab67 67 */
Jonathan Austin 1:8aa5cdb4ab67 68 bool operator==(const MemberFunctionCallback &mfc);
Jonathan Austin 1:8aa5cdb4ab67 69
Jonathan Austin 1:8aa5cdb4ab67 70 /**
Jonathan Austin 1:8aa5cdb4ab67 71 * Calls the method reference held by this MemberFunctionCallback.
Jonathan Austin 1:8aa5cdb4ab67 72 *
Jonathan Austin 1:8aa5cdb4ab67 73 * @param e The event to deliver to the method
Jonathan Austin 1:8aa5cdb4ab67 74 */
Jonathan Austin 1:8aa5cdb4ab67 75 void fire(MicroBitEvent e);
Jonathan Austin 1:8aa5cdb4ab67 76 };
Jonathan Austin 1:8aa5cdb4ab67 77
Jonathan Austin 1:8aa5cdb4ab67 78 /**
Jonathan Austin 1:8aa5cdb4ab67 79 * Constructor. Creates a MemberFunctionCallback based on a pointer to given method.
Jonathan Austin 1:8aa5cdb4ab67 80 *
Jonathan Austin 1:8aa5cdb4ab67 81 * @param object The object the callback method should be invooked on.
Jonathan Austin 1:8aa5cdb4ab67 82 *
Jonathan Austin 1:8aa5cdb4ab67 83 * @param method The method to invoke.
Jonathan Austin 1:8aa5cdb4ab67 84 */
Jonathan Austin 1:8aa5cdb4ab67 85 template <typename T>
Jonathan Austin 1:8aa5cdb4ab67 86 MemberFunctionCallback::MemberFunctionCallback(T* object, void (T::*method)(MicroBitEvent e))
Jonathan Austin 1:8aa5cdb4ab67 87 {
Jonathan Austin 1:8aa5cdb4ab67 88 this->object = object;
Jonathan Austin 1:8aa5cdb4ab67 89 memclr(this->method, sizeof(this->method));
Jonathan Austin 1:8aa5cdb4ab67 90 memcpy(this->method, &method, sizeof(method));
Jonathan Austin 1:8aa5cdb4ab67 91 invoke = &MemberFunctionCallback::methodCall<T>;
Jonathan Austin 1:8aa5cdb4ab67 92 }
Jonathan Austin 1:8aa5cdb4ab67 93
Jonathan Austin 1:8aa5cdb4ab67 94 /**
Jonathan Austin 1:8aa5cdb4ab67 95 * A template used to create a static method capable of invoking a C++ member function (method)
Jonathan Austin 1:8aa5cdb4ab67 96 * based on the given parameters.
Jonathan Austin 1:8aa5cdb4ab67 97 *
Jonathan Austin 1:8aa5cdb4ab67 98 * @param object The object the callback method should be invooked on.
Jonathan Austin 1:8aa5cdb4ab67 99 *
Jonathan Austin 1:8aa5cdb4ab67 100 * @param method The method to invoke.
Jonathan Austin 1:8aa5cdb4ab67 101 *
Jonathan Austin 1:8aa5cdb4ab67 102 * @param method The MicroBitEvent to supply to the given member function.
Jonathan Austin 1:8aa5cdb4ab67 103 */
Jonathan Austin 1:8aa5cdb4ab67 104 template <typename T>
Jonathan Austin 1:8aa5cdb4ab67 105 void MemberFunctionCallback::methodCall(void *object, uint32_t *method, MicroBitEvent e)
Jonathan Austin 1:8aa5cdb4ab67 106 {
Jonathan Austin 1:8aa5cdb4ab67 107 T* o = (T*)object;
Jonathan Austin 1:8aa5cdb4ab67 108 void (T::*m)(MicroBitEvent);
Jonathan Austin 1:8aa5cdb4ab67 109 memcpy(&m, method, sizeof(m));
Jonathan Austin 1:8aa5cdb4ab67 110
Jonathan Austin 1:8aa5cdb4ab67 111 (o->*m)(e);
Jonathan Austin 1:8aa5cdb4ab67 112 }
Jonathan Austin 1:8aa5cdb4ab67 113
Jonathan Austin 1:8aa5cdb4ab67 114 #endif