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97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/*
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* Copyright (C) 2005-2008 MaNGOS <http://getmangos.com/>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) 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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#ifndef MANGOS_REFERENCE_H
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#define MANGOS_REFERENCE_H
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/**
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* Referencer<T>
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* Referencer is an object that holds a reference holder that hold a reference
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* counted object. When an object's reference count drop to zero, it removes
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* the object. This is a non intrusive mechanism and any object at any point
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* in time can be referenced. When and object is reference counted, do not
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* pass the object directly to other methods but rather, pass its
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* reference around. Objects can be reference counted in both single threaded
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* model and multi-threaded model
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*/
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#include <stdexcept>
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#include "Platform/Define.h"
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#include "Policies/ThreadingModel.h"
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#include "ReferenceHolder.h"
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template
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<
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typename T,
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class THREADING_MODEL = MaNGOS::SingleThreaded<T>
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>
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class MANGOS_DLL_DECL Referencer
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{
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typedef typename THREADING_MODEL::Lock Lock;
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typedef ReferenceHolder<T, THREADING_MODEL> ReferenceeHolder;
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public:
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/// Constructs a referencer.
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Referencer(T *ref = NULL);
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/// Copy constructor
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Referencer(const Referencer &obj) : i_holder(NULL) { *this = obj; }
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/// Destructor
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~Referencer();
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/// Referencee accessor
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T* referencee(void) { return (i_holder == NULL ? NULL : i_holder->i_referencee); }
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const T* referencee(void) const { return (i_holder == NULL ? NULL : i_holder->i_referencee); }
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//T& referencee(void){ return _referencee(); }
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//const T& referencee(void) const { return const_cast<Referencer *>(this)->_referencee(); }
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operator T&(void) { return _referencee(); }
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operator const T&(void) const { return *const_cast<Referencer *>(this)->_referencee(); }
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/// cast operators
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T* operator*() { return (i_holder == NULL ? NULL : i_holder->i_referencee); }
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T const * operator*() const { return (i_holder == NULL ? NULL : i_holder->i_referencee); }
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/// overload operators
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T* operator->() { return (i_holder == NULL ? NULL : i_holder->i_referencee); }
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const T * operator->() const { return (i_holder == NULL ? NULL : i_holder->i_referencee); }
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/// operator =
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Referencer& operator=(const Referencer &obj);
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Referencer& operator=(T *);
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/// returns true if i_referencee is null
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bool isNull(void) const { return i_holder == NULL; }
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private:
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T& _referencee(void)
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{
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if( i_holder == NULL )
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throw std::runtime_error("Invalid access to null pointer");
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return *i_holder->i_referencee;
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}
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void deReference(ReferenceeHolder *);
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void addReference(ReferenceeHolder *);
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// private data
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ReferenceeHolder *i_holder;
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};
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#endif
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