1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23 24 #ifndef _VCL_IMPDEL_HXX 25 #define _VCL_IMPDEL_HXX 26 27 #include <list> 28 29 namespace vcl 30 { 31 32 class DeletionListener; 33 34 class DeletionNotifier 35 { 36 std::list< DeletionListener* > m_aListeners; 37 protected: DeletionNotifier()38 DeletionNotifier() {} 39 ~DeletionNotifier()40 ~DeletionNotifier() 41 { notifyDelete(); } 42 43 inline void notifyDelete(); 44 45 public: addDel(DeletionListener * pListener)46 void addDel( DeletionListener* pListener ) 47 { m_aListeners.push_back( pListener ); } 48 removeDel(DeletionListener * pListener)49 void removeDel( DeletionListener* pListener ) 50 { m_aListeners.remove( pListener ); } 51 }; 52 53 class DeletionListener 54 { 55 DeletionNotifier* m_pNotifier; 56 public: DeletionListener(DeletionNotifier * pNotifier)57 DeletionListener( DeletionNotifier* pNotifier ) 58 : m_pNotifier( pNotifier ) 59 { 60 if( m_pNotifier ) 61 m_pNotifier->addDel( this ); 62 } ~DeletionListener()63 ~DeletionListener() 64 { 65 if( m_pNotifier ) 66 m_pNotifier->removeDel( this ); 67 } deleted()68 void deleted() { m_pNotifier = NULL; } isDeleted() const69 bool isDeleted() const { return (m_pNotifier == NULL); } 70 }; 71 notifyDelete()72 inline void DeletionNotifier::notifyDelete() 73 { 74 for( std::list< DeletionListener* >::const_iterator it = 75 m_aListeners.begin(); it != m_aListeners.end(); ++it ) 76 (*it)->deleted(); 77 78 m_aListeners.clear(); 79 } 80 81 } // namespace vcl 82 83 #endif // _VCL_IMPDEL_HXX 84