Jan 28, 2010 · A singleton is a class which only allows one instance of itself to be created - and gives simple, easy access to said instance. The singleton premise is a pattern across software …

One example is if the constructor of the singleton allocates memory from the heap and you wish that allocation to be predictable, for instance in an embedded system or other tightly controlled …

The singleton pattern is a fully paid up member of the GoF's patterns book, but it lately seems rather orphaned by the developer world. I still use quite a lot of singletons, especially for factory

Apr 9, 2009 · Duplicate On design patterns: When should I use the singleton? class Singleton { private static Singleton instance; private Singleton() {} public static Singleton Instance { ...

Jun 10, 2020 · You want to customize what it means to call the class, which is decided by its type. In general, it makes sense to use a metaclass to implement a singleton. A singleton is special because …

What is the simplest/cleanest way to implement the singleton pattern in JavaScript?

Oct 10, 2014 · In this Java best practices book by Joshua Bloch, you can find explained why you should enforce the Singleton property with a private constructor or an Enum type. The chapter is quite long, …

When I look at this second example, it is very intuitive how this is a singleton, since the class holds a reference to one instance of itself, and only ever returns that instance.

I've heard recently that Singleton is an anti-pattern. I know it has to do with the fact making a class singleton is like making that unique instance a global variable, but it's also doing a lot more than that …

The glorified global variable - becomes a gloried global class. Some say breaking object-oriented design. Give me scenarios, other than the good old logger where it makes sense to use the singleton.