107 lines
2.5 KiB
C++
107 lines
2.5 KiB
C++
/* This file is part of Mapnik (c++ mapping toolkit)
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* Copyright (C) 2005 Artem Pavlenko
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*
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* Mapnik is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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//$Id$
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#ifndef PTR_HH
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#define PTR_HH
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namespace mapnik
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{
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template <typename T> struct DefaultDeletePolicy
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{
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static void destroy(T* p)
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{
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delete p;
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}
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};
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template <typename T,
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template <typename T> class DeallocPolicy=DefaultDeletePolicy>
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class ref_ptr
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{
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private:
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T* ptr_;
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int* pCount_;
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public:
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T* operator->() {return ptr_;}
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const T* operator->() const {return ptr_;}
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T* get() {return ptr_;}
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const T* get() const {return ptr_;}
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const T& operator *() const {return *ptr_;}
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T& operator *() {return *ptr_;}
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explicit ref_ptr(T* ptr=0)
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:ptr_(ptr),pCount_(new int(1)) {}
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ref_ptr(const ref_ptr& rhs)
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:ptr_(rhs.ptr_),pCount_(rhs.pCount_)
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{
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(*pCount_)++;
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}
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ref_ptr& operator=(const ref_ptr& rhs)
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{
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if (ptr_==rhs.ptr_) return *this;
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if (--(*pCount_)==0)
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{
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DeallocPolicy<T>::destroy(ptr_);
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delete pCount_;
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}
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ptr_=rhs.ptr_;
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pCount_=rhs.pCount_;
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(*pCount_)++;
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return *this;
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}
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bool operator !() const
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{
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return ptr_==0;
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}
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operator bool () const
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{
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return ptr_!=0;
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}
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inline friend bool operator==(const ref_ptr& lhs,
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const T* rhs)
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{
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return lhs.ptr_==rhs;
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}
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inline friend bool operator==(const T* lhs,
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const ref_ptr& rhs)
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{
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return lhs==rhs.ptr_;
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}
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inline friend bool operator!=(const ref_ptr& lhs,
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const T* rhs)
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{
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return lhs.ptr_!=rhs;
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}
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inline friend bool operator!=(const T* lhs,
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const ref_ptr& rhs)
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{
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return lhs!=rhs.ptr_;
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}
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~ref_ptr()
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{
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if (--(*pCount_)==0)
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{
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DeallocPolicy<T>::destroy(ptr_);
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delete pCount_;
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}
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}
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};
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}
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#endif //PTR_HH
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