1 // Copyright (C) 2004-2009 Mathias Froehlich - Mathias.Froehlich@web.de
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Library General Public
5 // License as published by the Free Software Foundation; either
6 // version 2 of the License, or (at your option) any later version.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Library General Public License for more details.
13 // You should have received a copy of the GNU General Public License
14 // along with this program; if not, write to the Free Software
15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 #include "SGWeakReferenced.hxx"
24 * Class for handling weak references to classes derived from SGWeakReferenced
25 * or SGVirtualWeakReferenced.
30 typedef T element_type;
34 SGWeakPtr(const SGWeakPtr& p) : mWeakData(p.mWeakData)
39 SGWeakPtr(const SGSharedPtr<U>& p)
42 SGWeakPtr(const SGWeakPtr<U>& p)
43 { SGSharedPtr<T> sharedPtr = p.lock(); assign(sharedPtr.get()); }
48 SGWeakPtr& operator=(const SGSharedPtr<U>& p)
49 { assign(p.get()); return *this; }
51 SGWeakPtr& operator=(const SGWeakPtr<U>& p)
52 { SGSharedPtr<T> sharedPtr = p.lock(); assign(sharedPtr.get()); return *this; }
53 SGWeakPtr& operator=(const SGWeakPtr& p)
54 { mWeakData = p.mWeakData; return *this; }
57 bool operator==(const SGWeakPtr<U>& rhs) const
58 { return mWeakData == rhs.mWeakData; }
60 bool operator!=(const SGWeakPtr<U>& rhs) const
61 { return mWeakData != rhs.mWeakData; }
63 bool operator<(const SGWeakPtr<U>& rhs) const
64 { return mWeakData < rhs.mWeakData; }
66 SGSharedPtr<T> lock(void) const
69 return SGSharedPtr<T>();
70 SGSharedPtr<T> sharedPtr;
71 sharedPtr.assignNonRef(mWeakData->getPointer<T>());
76 { return !mWeakData || mWeakData->mRefcount == 0; }
79 { mWeakData.reset(); }
81 { mWeakData.reset(); }
82 void swap(SGWeakPtr& weakPtr)
83 { mWeakData.swap(weakPtr.mWeakData); }
89 mWeakData = p->mWeakData;
94 // The indirect reference itself.
95 SGSharedPtr<SGWeakReferenced::WeakData> mWeakData;