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.
