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WTF

SharedPtr.h

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00001 // -*- mode: c++; c-basic-offset: 4 -*-
00002 /*
00003  *  This file is part of the KDE libraries
00004  *  Copyright (C) 2005 Apple Computer, Inc.
00005  *
00006  *  This library is free software; you can redistribute it and/or
00007  *  modify it under the terms of the GNU Library General Public
00008  *  License as published by the Free Software Foundation; either
00009  *  version 2 of the License, or (at your option) any later version.
00010  *
00011  *  This library is distributed in the hope that it will be useful,
00012  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  *  Library General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Library General Public License
00017  * along with this library; see the file COPYING.LIB.  If not, write to
00018  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00019  * Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #ifndef WTF_SharedPtr_h
00024 #define WTF_SharedPtr_h
00025 
00026 namespace WTF {
00027 
00028     // FIXME: Change template name to RefPtr?
00029     template <class T> class SharedPtr
00030     {
00031     public:
00032         SharedPtr() : m_ptr(0) {}
00033         SharedPtr(T *ptr) : m_ptr(ptr) { if (ptr) ptr->ref(); }
00034         SharedPtr(const SharedPtr &o) : m_ptr(o.m_ptr) { if (T *ptr = m_ptr) ptr->ref(); }
00035         ~SharedPtr() { if (T *ptr = m_ptr) ptr->deref(); }
00036         
00037         template <class U> SharedPtr(const SharedPtr<U> &o) : m_ptr(o.get()) { if (T *ptr = m_ptr) ptr->ref(); }
00038         
00039         // FIXME: Deprecate in favor of operators below, then remove?
00040         bool isNull() const { return m_ptr == 0; }
00041         bool notNull() const { return m_ptr != 0; }
00042         
00043         // FIXME: Deprecate in favor of operator=, then remove?
00044         void reset() { if (T *ptr = m_ptr) ptr->deref(); m_ptr = 0; }
00045         void reset(T *o) { if (o) o->ref(); if (T *ptr = m_ptr) ptr->deref(); m_ptr = o; }
00046         
00047         T *get() const { return m_ptr; }
00048         
00049         T &operator*() const { return *m_ptr; }
00050         T *operator->() const { return m_ptr; }
00051         
00052         bool operator!() const { return m_ptr == 0; }
00053         operator bool() const { return m_ptr != 0; }
00054         
00055         SharedPtr &operator=(const SharedPtr &);
00056         SharedPtr &operator=(T *);
00057         
00058     private:
00059         T *m_ptr;
00060         
00061         operator int() const; // deliberately not implemented; helps prevent operator bool from converting to int accidentally
00062     };
00063     
00064     template <class T> SharedPtr<T> &SharedPtr<T>::operator=(const SharedPtr<T> &o) 
00065     {
00066         T *optr = o.m_ptr;
00067         if (optr)
00068             optr->ref();
00069         if (T *ptr = m_ptr)
00070             ptr->deref();
00071         m_ptr = optr;
00072         return *this;
00073     }
00074     
00075     template <class T> inline SharedPtr<T> &SharedPtr<T>::operator=(T *optr)
00076     {
00077         if (optr)
00078             optr->ref();
00079         if (T *ptr = m_ptr)
00080             ptr->deref();
00081         m_ptr = optr;
00082         return *this;
00083     }
00084     
00085     template <class T> inline bool operator==(const SharedPtr<T> &a, const SharedPtr<T> &b) 
00086     { 
00087         return a.get() == b.get(); 
00088     }
00089 
00090     template <class T> inline bool operator==(const SharedPtr<T> &a, const T *b) 
00091     { 
00092         return a.get() == b; 
00093     }
00094     
00095     template <class T> inline bool operator==(const T *a, const SharedPtr<T> &b) 
00096     {
00097         return a == b.get(); 
00098     }
00099     
00100     template <class T> inline bool operator!=(const SharedPtr<T> &a, const SharedPtr<T> &b) 
00101     { 
00102         return a.get() != b.get(); 
00103     }
00104 
00105     template <class T> inline bool operator!=(const SharedPtr<T> &a, const T *b)
00106     {
00107         return a.get() != b; 
00108     }
00109 
00110     template <class T> inline bool operator!=(const T *a, const SharedPtr<T> &b) 
00111     { 
00112         return a != b.get(); 
00113     }
00114     
00115     template <class T, class U> inline SharedPtr<T> static_pointer_cast(const SharedPtr<U> &p) 
00116     { 
00117         return SharedPtr<T>(static_cast<T *>(p.get())); 
00118     }
00119 
00120     template <class T, class U> inline SharedPtr<T> const_pointer_cast(const SharedPtr<U> &p) 
00121     { 
00122         return SharedPtr<T>(const_cast<T *>(p.get())); 
00123     }
00124 
00125 } // namespace WTF
00126 
00127 using WTF::SharedPtr;
00128 using WTF::static_pointer_cast;
00129 using WTF::const_pointer_cast;
00130 
00131 #endif // WTF_SharedPtr_h

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