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Diffstat (limited to 'src/stable/singleton.h')
-rw-r--r-- | src/stable/singleton.h | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/stable/singleton.h b/src/stable/singleton.h new file mode 100644 index 0000000..13db01b --- /dev/null +++ b/src/stable/singleton.h | |||
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1 | /* | ||
2 | * Copyright (C) 2007-2011 Xagasoft, All rights reserved. | ||
3 | * | ||
4 | * This file is part of the libbu++ library and is released under the | ||
5 | * terms of the license contained in the file LICENSE. | ||
6 | */ | ||
7 | |||
8 | #ifndef BU_SINGLETON_H | ||
9 | #define BU_SINGLETON_H | ||
10 | |||
11 | #include <stdio.h> | ||
12 | |||
13 | namespace Bu | ||
14 | { | ||
15 | /** | ||
16 | * Provides singleton functionality in a modular sort of way. Make this the | ||
17 | * base class of any other class and you immediately gain singleton | ||
18 | * functionality. Be sure to make your constructor and various functions use | ||
19 | * intellegent scoping. Cleanup and instantiation are performed automatically | ||
20 | * for you at first use and program exit. There are two things that you must | ||
21 | * do when using this template, first is to inherit from it with the name of | ||
22 | * your class filling in for T and then make this class a friend of your class. | ||
23 | *@code | ||
24 | * // Making the Single Singleton: | ||
25 | * class Single : public Singleton<Single> | ||
26 | * { | ||
27 | * friend class Singleton<Single>; | ||
28 | * protected: | ||
29 | * Single(); | ||
30 | * ... | ||
31 | * }; | ||
32 | @endcode | ||
33 | * You can still add public functions and variables to your new Singleton child | ||
34 | * class, but your constructor should be protected (hence the need for the | ||
35 | * friend decleration). | ||
36 | */ | ||
37 | template <class T> | ||
38 | class Singleton | ||
39 | { | ||
40 | protected: | ||
41 | /** | ||
42 | * Private constructor. This constructor is empty but has a body so that | ||
43 | * you can make your own override of it. Be sure that you're override is | ||
44 | * also protected. | ||
45 | */ | ||
46 | Singleton() {}; | ||
47 | |||
48 | private: | ||
49 | /** | ||
50 | * Copy constructor, defined so that you could write your own as well. | ||
51 | */ | ||
52 | Singleton( const Singleton& ); | ||
53 | |||
54 | public: | ||
55 | /** | ||
56 | * Get a handle to the contained instance of the contained class. It is | ||
57 | * a reference. | ||
58 | *@returns A reference to the contained object. | ||
59 | */ | ||
60 | static T &getInstance() | ||
61 | { | ||
62 | static T i; | ||
63 | return i; | ||
64 | } | ||
65 | }; | ||
66 | } | ||
67 | |||
68 | #endif | ||