00001 /* 00002 CLAW - a C++ Library Absolutely Wonderful 00003 00004 CLAW is a free library without any particular aim but being useful to 00005 anyone. 00006 00007 Copyright (C) 2005-2008 Julien Jorge 00008 00009 This library is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU Lesser General Public 00011 License as published by the Free Software Foundation; either 00012 version 2.1 of the License, or (at your option) any later version. 00013 00014 This library is distributed in the hope that it will be useful, 00015 but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 Lesser General Public License for more details. 00018 00019 You should have received a copy of the GNU Lesser General Public 00020 License along with this library; if not, write to the Free Software 00021 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 00022 00023 contact: julien_jorge@yahoo.fr 00024 */ 00030 #include <cassert> 00031 #include <cstdlib> 00032 00033 /*----------------------------------------------------------------------------*/ 00037 template<typename T> 00038 claw::memory::smart_ptr<T>::smart_ptr() 00039 : m_ref_count(NULL), m_ptr(NULL) 00040 { 00041 00042 } // smart_ptr::smart_ptr() 00043 00044 /*----------------------------------------------------------------------------*/ 00055 template<typename T> 00056 claw::memory::smart_ptr<T>::smart_ptr( pointer data ) 00057 : m_ref_count(NULL), m_ptr(NULL) 00058 { 00059 if (data) 00060 { 00061 m_ref_count = new unsigned int(1); 00062 m_ptr = data; 00063 } 00064 } // smart_ptr::smart_ptr() [pointer] 00065 00066 /*----------------------------------------------------------------------------*/ 00071 template<typename T> 00072 claw::memory::smart_ptr<T>::smart_ptr( const self_type& that ) 00073 { 00074 copy( that ); 00075 } // smart_ptr::smart_ptr() [copy] 00076 00077 /*----------------------------------------------------------------------------*/ 00081 template<typename T> 00082 claw::memory::smart_ptr<T>::~smart_ptr() 00083 { 00084 release(); 00085 } // smart_ptr::~smart_ptr() 00086 00087 /*----------------------------------------------------------------------------*/ 00092 template<typename T> 00093 typename claw::memory::smart_ptr<T>::self_type& 00094 claw::memory::smart_ptr<T>::operator=( const self_type& that ) 00095 { 00096 if ( &that != this ) 00097 { 00098 release(); 00099 copy( that ); 00100 } 00101 00102 return *this; 00103 } // smart_ptr::operator=() 00104 00105 /*----------------------------------------------------------------------------*/ 00110 template<typename T> 00111 bool claw::memory::smart_ptr<T>::operator==( const self_type& that ) const 00112 { 00113 return m_ptr == that.m_ptr; 00114 } // smart_ptr::operator==() 00115 00116 /*----------------------------------------------------------------------------*/ 00121 template<typename T> 00122 bool claw::memory::smart_ptr<T>::operator!=( const self_type& that ) const 00123 { 00124 return !( (*this) == that ); 00125 } // smart_ptr::operator!=() 00126 00127 /*----------------------------------------------------------------------------*/ 00131 template<typename T> 00132 typename claw::memory::smart_ptr<T>::pointer 00133 claw::memory::smart_ptr<T>::operator->() 00134 { 00135 return m_ptr; 00136 } // smart_ptr::operator->() 00137 00138 /*----------------------------------------------------------------------------*/ 00142 template<typename T> 00143 typename claw::memory::smart_ptr<T>::const_pointer 00144 claw::memory::smart_ptr<T>::operator->() const 00145 { 00146 return m_ptr; 00147 } // smart_ptr::operator->() 00148 00149 /*----------------------------------------------------------------------------*/ 00153 template<typename T> 00154 typename claw::memory::smart_ptr<T>::reference 00155 claw::memory::smart_ptr<T>::operator*() 00156 { 00157 return *m_ptr; 00158 } // smart_ptr::operator*() 00159 00160 /*----------------------------------------------------------------------------*/ 00164 template<typename T> 00165 typename claw::memory::smart_ptr<T>::const_reference 00166 claw::memory::smart_ptr<T>::operator*() const 00167 { 00168 return *m_ptr; 00169 } // smart_ptr::operator*() 00170 00171 /*----------------------------------------------------------------------------*/ 00176 template<typename T> 00177 void claw::memory::smart_ptr<T>::copy( const self_type& that ) 00178 { 00179 assert( this != &that ); 00180 00181 m_ref_count = that.m_ref_count; 00182 m_ptr = that.m_ptr; 00183 00184 if (m_ref_count) 00185 ++(*m_ref_count); 00186 } // smart_ptr::copy() 00187 00188 /*----------------------------------------------------------------------------*/ 00194 template<typename T> 00195 void claw::memory::smart_ptr<T>::release() 00196 { 00197 if (m_ref_count) 00198 if ( *m_ref_count ) 00199 { 00200 --(*m_ref_count); 00201 00202 if ( !(*m_ref_count) ) 00203 { 00204 delete m_ptr; 00205 delete m_ref_count; 00206 00207 m_ref_count = NULL; 00208 } 00209 00210 m_ptr = NULL; 00211 } 00212 } // smart_ptr::release()