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VTableSupport.hppGo to the documentation of this file.00001 00002 #ifndef _VTABLESUPPORT_HPP_ 00003 #define _VTABLESUPPORT_HPP_ 00004 00005 /* 00006 * Name: VTableSupport.hpp 00007 * Purpose: 00008 * 00009 * ADOBE SYSTEMS INCORPORATED 00010 * Copyright 2005-2007 Adobe Systems Incorporated. 00011 * All rights reserved. 00012 * 00013 * NOTICE: Adobe permits you to use, modify, and distribute this file 00014 * in accordance with the terms of the Adobe license agreement 00015 * accompanying it. If you have received this file from a source other 00016 * than Adobe, then your use, modification, or distribution of it 00017 * requires the prior written permission of Adobe. 00018 * 00019 */ 00020 00021 #include "AIHeaderBegin.h" 00022 00024 // 00025 // If your plugin has a C++ object attached to it's globals, and if 00026 // the class of that object has virtual functions, those functions 00027 // will not work after the plugin is unloaded and then reloaded. 00028 // 00029 // The following macro (FIXUP_VTABLE) can be used to provide a means 00030 // of restoring the virtual function table of a globally-persistent 00031 // C++ object by calling FixupVTable() prior to the use of any of 00032 // the object's virtual functions after a reload. 00033 // 00034 // Here is how you might use the macro: 00035 // 00036 // class MyGlobals 00037 // { 00038 // public: 00039 // // 00040 // [some class definition code skipped]; 00041 // // 00042 // // pass class name to macro 00043 // FIXUP_VTABLE(MyGlobals); 00044 // // 00045 // // Note: private access at this point 00046 // // 00047 // protected: 00048 // // 00049 // [more class definition code skipped]; 00050 // }; 00051 // 00052 // // 00053 // // Then, later in the translation: 00054 // // 00055 // 00056 // ASErr 00057 // OnReloadPlugin(SPInterfaceMessage *pMsg) 00058 // { 00059 // MyGlobals *pGlobals = (MyGlobals *) pMsg->d.globals; 00060 // 00061 // // don't use any of MyGlobals' virtual functions here 00062 // [some code skipped]; 00063 // 00064 // // should probably do this early on. 00065 // MyGlobals::FixupVTable(pGlobals); 00066 // 00067 // // o.k. to use virtual functions now 00068 // [more code skipped]; 00069 // } 00070 // 00072 00073 #define FIXUP_VTABLE(CLASSNAME) \ 00074 public: \ 00075 static void FixupVTable(CLASSNAME *pThis) {pThis = new(pThis) CLASSNAME((FixupVTableSignature) 0);} \ 00076 private: \ 00077 typedef ai::int32 FixupVTableSignature; \ 00078 CLASSNAME(FixupVTableSignature) {} \ 00079 static void *operator new(size_t /*uiSize*/, CLASSNAME * pThis) {return pThis;} \ 00080 static void operator delete(void * /*pMem*/, CLASSNAME * /*pThis*/) {} \ 00081 // 00082 00084 // 00085 // If you are using operator new from a base class, you can use the 00086 // following macro so that the compiler can resolve the overloading 00087 // in the scope of your derived class. 00088 // 00090 00091 #define FIXUP_VTABLE_EX(CLASSNAME, BASECLASS) \ 00092 public: \ 00093 void *operator new(size_t uiSize) {return BASECLASS::operator new(uiSize);} \ 00094 void operator delete(void *pMem) {BASECLASS::operator delete(pMem);} \ 00095 FIXUP_VTABLE(CLASSNAME) 00096 00098 // 00099 // If you are using a global operator new, you can use the 00100 // following macro so that the compiler can resolve the overloading 00101 // in the scope of your derived class. 00102 // 00104 00105 #define FIXUP_VTABLE_EX1(CLASSNAME) \ 00106 public: \ 00107 void *operator new(size_t uiSize) {return ::operator new(uiSize);} \ 00108 void operator delete(void *pMem) {::operator delete(pMem); } \ 00109 FIXUP_VTABLE(CLASSNAME) 00110 00111 #include "AIHeaderEnd.h" 00112 00113 #endif // _VTABLESUPPORT_HPP_ 00114 |
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