object.h
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1 /*
2  * Copyright (C) 2005 Tommi Maekitalo
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * As a special exception, you may use this file as part of a free
10  * software library without restriction. Specifically, if other files
11  * instantiate templates or use macros or inline functions from this
12  * file, or you compile this file and link it with other files to
13  * produce an executable, this file does not by itself cause the
14  * resulting executable to be covered by the GNU General Public
15  * License. This exception does not however invalidate any other
16  * reasons why the executable file might be covered by the GNU Library
17  * General Public License.
18  *
19  * This library is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22  * Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public
25  * License along with this library; if not, write to the Free Software
26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27  */
28 
29 
30 #ifndef TNT_OBJECT_H
31 #define TNT_OBJECT_H
32 
33 #include <cxxtools/refcounted.h>
34 #include <cxxtools/smartptr.h>
35 
36 namespace tnt
37 {
39  {
40  public:
41  virtual ~Object() { }
42 
44 
45  template <typename data_type>
46  data_type* cast();
47  };
48 
49  template <typename data_type, template <class> class destroyPolicy = cxxtools::DeletePolicy>
50  class PointerObject : public Object, public destroyPolicy<data_type>
51  {
52  data_type* _ptr;
53 
54  public:
55  explicit PointerObject(data_type* ptr = 0)
56  : _ptr(ptr)
57  { }
59  { destroyPolicy<data_type>::destroy(_ptr); }
60  void set(data_type* ptr)
61  { destroyPolicy<data_type>::destroy(_ptr); _ptr = ptr; }
62  data_type* get() { return _ptr; }
63  };
64 
65  template <typename data_type>
67  {
68  // assign the PointerObject to a smart pointer prior calling the ctor of
69  // the created object to prevent memory leaky in case the ctor throws an
70  // exception
72  Object::pointer_type ret = _ptr;
73  _ptr->set(new data_type(d));
74  return ret;
75  }
76 
77  template <typename data_type>
78  data_type* Object::cast()
79  { return static_cast<PointerObject<data_type>*>(this)->get(); }
80 }
81 
82 #endif // TNT_OBJECT_H
83