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  { }
43 
45 
46  template <typename data_type>
47  data_type* cast();
48  };
49 
50  template <typename data_type, template <class> class destroyPolicy = cxxtools::DeletePolicy>
51  class PointerObject : public Object, public destroyPolicy<data_type>
52  {
53  data_type* ptr;
54 
55  public:
56  explicit PointerObject(data_type* ptr_ = 0)
57  : ptr(ptr_)
58  { }
60  { destroyPolicy<data_type>::destroy(ptr); }
61  void set(data_type* ptr_)
62  { destroyPolicy<data_type>::destroy(ptr); ptr = ptr_; }
63  data_type* get() { return ptr; }
64  };
65 
66  template <typename data_type>
68  {
69  // assign the PointerObject to a smart pointer prior calling the ctor of
70  // the created object to prevent memory leaky in case the ctor throws an
71  // exception
73  Object::pointer_type ret = ptr;
74  ptr->set(new data_type(d));
75  return ret;
76  }
77 
78  template <typename data_type>
79  data_type* Object::cast()
80  {
81  return static_cast<PointerObject<data_type>*>(this)->get();
82  }
83 }
84 
85 #endif // TNT_OBJECT_H
86