Sacado_Handle.hpp

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00001 // $Id$ 
00002 // $Source$ 
00003 // @HEADER
00004 // ***********************************************************************
00005 // 
00006 //                           Sacado Package
00007 //                 Copyright (2006) Sandia Corporation
00008 // 
00009 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00010 // license for use of this work by or on behalf of the U.S. Government.
00011 // 
00012 // This library is free software; you can redistribute it and/or modify
00013 // it under the terms of the GNU Lesser General Public License as
00014 // published by the Free Software Foundation; either version 2.1 of the
00015 // License, or (at your option) any later version.
00016 //  
00017 // This library is distributed in the hope that it will be useful, but
00018 // WITHOUT ANY WARRANTY; without even the implied warranty of
00019 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00020 // Lesser General Public License for more details.
00021 //  
00022 // You should have received a copy of the GNU Lesser General Public
00023 // License along with this library; if not, write to the Free Software
00024 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00025 // USA
00026 // Questions? Contact David M. Gay (dmgay@sandia.gov) or Eric T. Phipps
00027 // (etphipp@sandia.gov).
00028 // 
00029 // ***********************************************************************
00030 // @HEADER
00031 
00032 #ifndef SACADO_HANDLE_HPP
00033 #define SACADO_HANDLE_HPP
00034 
00035 namespace Sacado {
00036 
00040   template <typename T>
00041   class Handle {
00042   public:
00043 
00045     Handle(T* p) : rep(p), count(new int(1)) {}
00046 
00048     Handle(const Handle& h) : rep(h.rep), count(h.count) { (*count)++; }
00049 
00051     ~Handle() { decrementRef(); }
00052 
00054     T* get() { return rep; }
00055 
00057     const T* get() const { return rep; }
00058 
00060     void Assign(const Handle& h) {
00061       decrementRef();
00062       rep = new T(*(h.rep));
00063       count = new int(1);
00064     }
00065 
00067     void makeOwnCopy() {
00068       T *tmp;
00069       if (*count > 1) {
00070   tmp = rep;
00071   (*count)--;
00072   rep = new T(*tmp);
00073   count = new int(1);
00074       }
00075     }
00076     
00078     Handle& operator = (const Handle& h) {
00079       if (this != &h) {
00080   decrementRef();
00081   rep = h.rep; 
00082   count = h.count;
00083   (*count)++;
00084       }
00085       return *this;
00086     }
00087 
00089     T* operator -> () const { return rep; }
00090 
00092     const T& operator * () const { return *rep; }
00093 
00095     T& operator * () { return *rep; }
00096     
00097   private:
00098 
00100     T *rep;
00101 
00103     int *count;
00104     
00106     void decrementRef() {
00107       (*count)--;
00108       if (*count == 0) {
00109   delete rep;
00110   delete count;
00111       }
00112     }
00113 
00114   }; // class Handle
00115 
00117   template <typename T>
00118   bool operator==(const Handle<T>& h1, const Handle<T>& h2) {
00119     return h1.get() == h2.get();
00120   }
00121 
00122 } // namespace Sacado
00123 
00124 #endif // SACADO_HANDLE_HPP
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