00001 /* 00002 * Copyright 2006 Intel Corporation 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http://www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00017 #ifndef __POINTERHANDLE_H__ 00018 #define __POINTERHANDLE_H__ 00019 00020 #include <map> 00021 00022 #include "../debug/DebugUtils.h" 00023 00024 namespace oasys { 00025 00031 template < 00032 typename _PtrType // type of pointer being stored 00033 > 00034 class PointerHandle { 00035 public: 00039 PointerHandle() : ptr_(0) {} 00040 00044 virtual ~PointerHandle() { ptr_ = 0; } 00045 00047 _PtrType& operator*() const { 00048 restore_and_update(); 00049 return *ptr_; 00050 } 00051 _PtrType* operator->() const { 00052 restore_and_update(); 00053 return ptr_; 00054 } 00056 00058 _PtrType* ptr() const { 00059 restore_and_update(); 00060 return ptr_; 00061 } 00062 00063 protected: 00064 mutable _PtrType* ptr_; 00065 00070 virtual void invalidate() const = 0; 00071 00076 virtual void restore() const = 0; 00077 00081 virtual void update() const = 0; 00082 00083 void restore_and_update() const { 00084 if (ptr_ == 0) { 00085 restore(); 00086 ASSERT(ptr_ != 0); 00087 } 00088 update(); 00089 } 00090 }; 00091 00092 } // namespace oasys 00093 00094 #endif /* __POINTERHANDLE_H__ */