1 | // |
2 | // AbstractDelegate.h |
3 | // |
4 | // Library: Foundation |
5 | // Package: Events |
6 | // Module: AbstractDelegate |
7 | // |
8 | // Implementation of the AbstractDelegate template. |
9 | // |
10 | // Copyright (c) 2006-2011, Applied Informatics Software Engineering GmbH. |
11 | // and Contributors. |
12 | // |
13 | // SPDX-License-Identifier: BSL-1.0 |
14 | // |
15 | |
16 | |
17 | #ifndef Foundation_AbstractDelegate_INCLUDED |
18 | #define Foundation_AbstractDelegate_INCLUDED |
19 | |
20 | |
21 | #include "Poco/Foundation.h" |
22 | |
23 | |
24 | namespace Poco { |
25 | |
26 | |
27 | template <class TArgs> |
28 | class AbstractDelegate |
29 | /// Base class for Delegate and Expire. |
30 | { |
31 | public: |
32 | AbstractDelegate() |
33 | { |
34 | } |
35 | |
36 | AbstractDelegate(const AbstractDelegate& /*del*/) |
37 | { |
38 | } |
39 | |
40 | virtual ~AbstractDelegate() |
41 | { |
42 | } |
43 | |
44 | virtual bool notify(const void* sender, TArgs& arguments) = 0; |
45 | /// Invokes the delegate's callback function. |
46 | /// Returns true if successful, or false if the delegate |
47 | /// has been disabled or has expired. |
48 | |
49 | virtual bool equals(const AbstractDelegate& other) const = 0; |
50 | /// Compares the AbstractDelegate with the other one for equality. |
51 | |
52 | virtual AbstractDelegate* clone() const = 0; |
53 | /// Returns a deep copy of the AbstractDelegate. |
54 | |
55 | virtual void disable() = 0; |
56 | /// Disables the delegate, which is done prior to removal. |
57 | |
58 | virtual const AbstractDelegate* unwrap() const |
59 | /// Returns the unwrapped delegate. Must be overridden by decorators |
60 | /// like Expire. |
61 | { |
62 | return this; |
63 | } |
64 | }; |
65 | |
66 | |
67 | template <> |
68 | class AbstractDelegate<void> |
69 | /// Base class for Delegate and Expire. |
70 | { |
71 | public: |
72 | AbstractDelegate() |
73 | { |
74 | } |
75 | |
76 | AbstractDelegate(const AbstractDelegate&) |
77 | { |
78 | } |
79 | |
80 | virtual ~AbstractDelegate() |
81 | { |
82 | } |
83 | |
84 | virtual bool notify(const void* sender) = 0; |
85 | /// Invokes the delegate's callback function. |
86 | /// Returns true if successful, or false if the delegate |
87 | /// has been disabled or has expired. |
88 | |
89 | virtual bool equals(const AbstractDelegate& other) const = 0; |
90 | /// Compares the AbstractDelegate with the other one for equality. |
91 | |
92 | virtual AbstractDelegate* clone() const = 0; |
93 | /// Returns a deep copy of the AbstractDelegate. |
94 | |
95 | virtual void disable() = 0; |
96 | /// Disables the delegate, which is done prior to removal. |
97 | |
98 | virtual const AbstractDelegate* unwrap() const |
99 | /// Returns the unwrapped delegate. Must be overridden by decorators |
100 | /// like Expire. |
101 | { |
102 | return this; |
103 | } |
104 | }; |
105 | |
106 | |
107 | } // namespace Poco |
108 | |
109 | |
110 | #endif // Foundation_AbstractDelegate_INCLUDED |
111 | |