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