safe_ptr.h

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00001 /*
00002  *  This file is part of libcxxsupport.
00003  *
00004  *  libcxxsupport is free software; you can redistribute it and/or modify
00005  *  it under the terms of the GNU General Public License as published by
00006  *  the Free Software Foundation; either version 2 of the License, or
00007  *  (at your option) any later version.
00008  *
00009  *  libcxxsupport is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU General Public License
00015  *  along with libcxxsupport; if not, write to the Free Software
00016  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00017  */
00018 
00019 /*
00020  *  libcxxsupport is being developed at the Max-Planck-Institut fuer Astrophysik
00021  *  and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
00022  *  (DLR).
00023  */
00024 
00025 /*! \file safe_ptr.h
00026  *  Pointer wrapper for better exception safety and leakage prevention
00027  *
00028  *  Copyright (C) 2005, 2008 Max-Planck-Society
00029  *  \author Martin Reinecke
00030  */
00031 
00032 #ifndef PLANCK_SAFE_PTR_H
00033 #define PLANCK_SAFE_PTR_H
00034 
00035 #include "error_handling.h"
00036 
00037 template <typename T> class safe_ptr
00038   {
00039   private:
00040     T *p;
00041     bool set;
00042 
00043     // forbid copying of safe_ptrs, at least until we know how to do it
00044     safe_ptr (const safe_ptr &) {}
00045     safe_ptr &operator= (const safe_ptr &) { return *this; }
00046 
00047   public:
00048     safe_ptr() : p(0), set(false) {}
00049     safe_ptr (T *p2) : p(p2), set(true) {}
00050     ~safe_ptr() { delete p; }
00051 
00052     void operator= (T *p2)
00053       {
00054       planck_assert (!set, "safe_ptr: already set");
00055       set = true;
00056       p=p2;
00057       }
00058 
00059     void reset()
00060       {
00061       delete p;
00062       p=0;
00063       set=false;
00064       }
00065 
00066     operator T*() { return p; }
00067     operator const T*() const { return p; }
00068     T *operator->() { return p; }
00069     const T *operator->() const { return p; }
00070   };
00071 
00072 #endif

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