Testing some singleton implementations
Namespace
rswhite4 at googlemail.com
Fri Jan 31 02:27:27 PST 2014
On Friday, 31 January 2014 at 10:20:45 UTC, Dejan Lekic wrote:
> I was thinking about implementing a typical Java singleton in
> D, and then decided to first check whether someone already did
> that, and guess what - yes, someone did. Chech this URL:
> http://dblog.aldacron.net/2007/03/03/singletons-in-d/
>
> Something like this (taken from the article above) in the case
> you do not want lazy initialisation:
>
> class Singleton2(T)
> {
> public:
> static const T instance;
>
> private:
> this() {}
>
> static this() { instance = new T; }
> }
>
> class TMySingleton2 : Singleton!(TMySingleton2)
> {
> }
>
> Something like this (taken from the article above) in the case
> you want lazy initialisation:
>
> class Singleton(T)
> {
> public:
> static T instance()
> {
> if(_instance is null) _instance = new T;
> return _instance;
> }
>
> private:
> this() {}
>
> static T _instance;
> }
>
> class TMySingleton : Singleton!(TMySingleton)
> {
> }
>
> If there are some Java programmers around who are curious how
> is Java version done:
> http://www.javaworld.com/article/2073352/core-java/simply-singleton.html
Why is someone interested in implementing such an Ani Pattern
like Singletons? In most of all cases Singletons are misused.
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