Callback.h

00001 /**
00002  * ACKme WiConnect Host Library is licensed under the BSD licence: 
00003  * 
00004  * Copyright (c)2014 ACKme Networks.
00005  * All rights reserved. 
00006  * 
00007  * Redistribution and use in source and binary forms, with or without modification, 
00008  * are permitted provided that the following conditions are met: 
00009  * 
00010  * 1. Redistributions of source code must retain the above copyright notice, 
00011  * this list of conditions and the following disclaimer. 
00012  * 2. Redistributions in binary form must reproduce the above copyright notice, 
00013  * this list of conditions and the following disclaimer in the documentation 
00014  * and/or other materials provided with the distribution. 
00015  * 3. The name of the author may not be used to endorse or promote products 
00016  * derived from this software without specific prior written permission. 
00017  * 
00018  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS AND ANY EXPRESS OR IMPLIED 
00019  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
00020  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
00021  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
00022  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
00023  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
00024  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
00025  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
00026  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
00027  * OF SUCH DAMAGE.
00028  */
00029 #pragma once
00030 
00031 
00032 #include "api/WiconnectTypes.h"
00033 #include "FunctionPointer.h"
00034 
00035 
00036 
00037 namespace wiconnect
00038 {
00039 
00040 
00041 typedef void (*_Callback)(WiconnectResult result, void *arg1, void *arg2);
00042 
00043 
00044 /**
00045  * @ingroup api_core_types
00046  *
00047  * @brief Generic callback function.
00048  */
00049 class Callback : public FunctionPointer
00050 {
00051 public:
00052     /*************************************************************************************************/
00053     Callback(_Callback func = 0)
00054     {
00055         _function = (void*)func;
00056         _membercaller = NULL;
00057         _object = NULL;
00058     }
00059 
00060     /*************************************************************************************************/
00061     template<typename T>
00062     Callback(T *object, void (T::*member)(WiconnectResult result, void *arg1, void *arg2))
00063     {
00064         _object = static_cast<void*>(object);
00065         memcpy(_member, (char*)&member, sizeof(member));
00066         _membercaller = (void*)&Callback::membercaller<T>;
00067         _function = 0;
00068     }
00069 
00070     /*************************************************************************************************/
00071     void call(WiconnectResult result, void *arg1, void *arg2)
00072     {
00073         if (_function)
00074         {
00075             ((_Callback)_function)(result, arg1, arg2);
00076         }
00077         else if (_object)
00078         {
00079             typedef void (*membercallerFunc)(void*, char*, WiconnectResult result, void *arg1, void *arg2);
00080             ((membercallerFunc)_membercaller)(_object, _member, result, arg1, arg2);
00081         }
00082     }
00083 
00084 private:
00085 
00086     /*************************************************************************************************/
00087     template<typename T>
00088     static void membercaller(void *object, char *member, WiconnectResult result, void *arg1, void *arg2)
00089     {
00090         T* o = static_cast<T*>(object);
00091         void (T::*m)(WiconnectResult result, void *arg1, void *arg2);
00092         memcpy((char*)&m, member, sizeof(m));
00093         (o->*m)(result, arg1, arg2);
00094     }
00095 
00096 };
00097 
00098 
00099 }