ClanLib  2.3.7
comptr.h
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1 /*
2 ** ClanLib SDK
3 ** Copyright (c) 1997-2011 The ClanLib Team
4 **
5 ** This software is provided 'as-is', without any express or implied
6 ** warranty. In no event will the authors be held liable for any damages
7 ** arising from the use of this software.
8 **
9 ** Permission is granted to anyone to use this software for any purpose,
10 ** including commercial applications, and to alter it and redistribute it
11 ** freely, subject to the following restrictions:
12 **
13 ** 1. The origin of this software must not be misrepresented; you must not
14 ** claim that you wrote the original software. If you use this software
15 ** in a product, an acknowledgment in the product documentation would be
16 ** appreciated but is not required.
17 ** 2. Altered source versions must be plainly marked as such, and must not be
18 ** misrepresented as being the original software.
19 ** 3. This notice may not be removed or altered from any source distribution.
20 **
21 ** Note: Some of the libraries ClanLib may link to may have additional
22 ** requirements or restrictions.
23 **
24 ** File Author(s):
25 **
26 ** Magnus Norddahl
27 */
28 
29 #pragma once
30 
31 
32 #include "../api_core.h"
33 
34 template <typename Type>
39 {
40 public:
41  CL_ComPtr() : ptr(0) { }
42  CL_ComPtr(Type *ptr) : ptr(ptr) { }
43  CL_ComPtr(const CL_ComPtr &copy) : ptr(copy.ptr) { if (ptr) ptr->AddRef(); }
44  ~CL_ComPtr() { clear(); }
45  CL_ComPtr &operator =(const CL_ComPtr &copy)
46  {
47  if (this == &copy)
48  return *this;
49  copy.ptr->AddRef();
50  if (ptr)
51  ptr->Release();
52  ptr = copy.ptr;
53  return *this;
54  }
55  const Type * const operator ->() const { return ptr; }
56  Type *operator ->() { return ptr; }
57  operator Type *() { return ptr; }
58 
59  bool is_null() const { return ptr == 0; }
60  void clear() { if (ptr) ptr->Release(); ptr = 0; }
61  Type **output_variable() { clear(); return &ptr; }
62 
63  Type *ptr;
64 };
65 
66