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1 | #ifndef SINGLETON_H | ||
2 | #define SINGLETON_H | ||
3 | |||
4 | #include <stdio.h> | ||
5 | |||
6 | namespace Bu | ||
7 | { | ||
8 | /** | ||
9 | * Provides singleton functionality in a modular sort of way. Make this the | ||
10 | * base class of any other class and you immediately gain singleton | ||
11 | * functionality. Be sure to make your constructor and various functions use | ||
12 | * intellegent scoping. Cleanup and instantiation are performed automatically | ||
13 | * for you at first use and program exit. There are two things that you must | ||
14 | * do when using this template, first is to inherit from it with the name of | ||
15 | * your class filling in for T and then make this class a friend of your class. | ||
16 | *@code | ||
17 | * // Making the Single Singleton: | ||
18 | * class Single : public Singleton<Single> | ||
19 | * { | ||
20 | * friend class Singleton<Single>; | ||
21 | * protected: | ||
22 | * Single(); | ||
23 | * ... | ||
24 | * }; | ||
25 | @endcode | ||
26 | * You can still add public functions and variables to your new Singleton child | ||
27 | * class, but your constructor should be protected (hence the need for the | ||
28 | * friend decleration). | ||
29 | *@author Mike Buland | ||
30 | */ | ||
31 | template <class T> | ||
32 | class Singleton | ||
33 | { | ||
34 | protected: | ||
35 | /** | ||
36 | * Private constructor. This constructor is empty but has a body so that | ||
37 | * you can make your own override of it. Be sure that you're override is | ||
38 | * also protected. | ||
39 | */ | ||
40 | Singleton() {}; | ||
41 | |||
42 | private: | ||
43 | /** | ||
44 | * Copy constructor, defined so that you could write your own as well. | ||
45 | */ | ||
46 | Singleton( const Singleton& ); | ||
47 | |||
48 | public: | ||
49 | /** | ||
50 | * Get a handle to the contained instance of the contained class. It is | ||
51 | * a reference. | ||
52 | *@returns A reference to the contained object. | ||
53 | */ | ||
54 | static T &getInstance() | ||
55 | { | ||
56 | static T i; | ||
57 | return i; | ||
58 | } | ||
59 | }; | ||
60 | } | ||
61 | |||
62 | #endif | ||