singleton source code

1 /**
2  * Skadi.d Web Framework
3  *
4  * Authors: Faianca
5  * Copyright: Copyright (c) 2015 Faianca
6  * License: MIT License, see LICENSE
7  */
8 module singleton;
9 
10 mixin template Singleton ()
11 {
12 	mixin .SingletonBase;
13 }
14 
15 mixin template Singleton ( alias Ctor )
16 {
17 	mixin .SingletonBase;
18 
19 	protected this ()
20     {
21 		static if ( is( typeof( super() ) ) ) {
22 			super();
23 		}
24 		Ctor();
25 	}
26 
27 }
28 
29 mixin template Singleton ( string CtorImpl )
30 {
31 	mixin .SingletonBase;
32 
33 	protected this ()
34     {
35 		static if ( is( typeof( super() ) ) ) {
36 			super();
37 		}
38 		mixin( CtorImpl );
39 	}
40 }
41 
42 mixin template SingletonBase ()
43 {
44 	static @property RealClass instance ( this RealClass ) ()
45     {
46 		static RealClass self;
47 
48 		if ( self is null ) {
49 			self = new RealClass;
50 		}
51 		return self;
52 	}
53 
54 	alias instance opCall;
55 }