1 | |
2 | // |
3 | // This source file is part of appleseed. |
4 | // Visit http://appleseedhq.net/ for additional information and resources. |
5 | // |
6 | // This software is released under the MIT license. |
7 | // |
8 | // Copyright (c) 2010-2013 Francois Beaune, Jupiter Jazz Limited |
9 | // Copyright (c) 2014-2017 Francois Beaune, The appleseedhq Organization |
10 | // |
11 | // Permission is hereby granted, free of charge, to any person obtaining a copy |
12 | // of this software and associated documentation files (the "Software"), to deal |
13 | // in the Software without restriction, including without limitation the rights |
14 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
15 | // copies of the Software, and to permit persons to whom the Software is |
16 | // furnished to do so, subject to the following conditions: |
17 | // |
18 | // The above copyright notice and this permission notice shall be included in |
19 | // all copies or substantial portions of the Software. |
20 | // |
21 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
22 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
23 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
24 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
25 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
26 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
27 | // THE SOFTWARE. |
28 | // |
29 | |
30 | #ifndef APPLESEED_FOUNDATION_CORE_CONCEPTS_IUNKNOWN_H |
31 | #define APPLESEED_FOUNDATION_CORE_CONCEPTS_IUNKNOWN_H |
32 | |
33 | // appleseed.foundation headers. |
34 | #include "foundation/core/concepts/noncopyable.h" |
35 | |
36 | // appleseed.main headers. |
37 | #include "main/dllsymbol.h" |
38 | |
39 | namespace foundation |
40 | { |
41 | |
42 | // |
43 | // A COM-like IUnknown interface. |
44 | // |
45 | // At the moment, only the Release method is implemented, and it behaves |
46 | // differently than the COM IUnknown::Release in that it simply deletes |
47 | // the instance, whereas the COM one decrements the reference count by 1. |
48 | // The other two methods, IUnknown::AddRef and IUnknown::QueryInterface, |
49 | // are not yet supported. |
50 | // |
51 | |
52 | class APPLESEED_DLLSYMBOL IUnknown |
53 | : public NonCopyable |
54 | { |
55 | public: |
56 | // Delete this instance. |
57 | // Use this method to delete an instance which was created by a |
58 | // factory. This ensures that an instance is created and deleted |
59 | // using the same memory subsystem, for example if the factory |
60 | // resides inside a DLL. Do not use this method to delete an |
61 | // instance which was created using the new operator. In this case, |
62 | // simply use the delete operator. |
63 | virtual void release() = 0; |
64 | |
65 | protected: |
66 | // Declare the destructor as protected to prevent the user from |
67 | // calling delete on an IUnknown pointer, but not on a pointer |
68 | // type derived from IUnknown. |
69 | // For convenience, also declare the destructor as virtual to |
70 | // make it safe to call delete on a derived type without having |
71 | // to add virtual destructors to all derived types. |
72 | virtual ~IUnknown() {} |
73 | }; |
74 | |
75 | } // namespace foundation |
76 | |
77 | #endif // !APPLESEED_FOUNDATION_CORE_CONCEPTS_IUNKNOWN_H |
78 | |