What irks me most though is the run-time check of the hidden boolean in getInstance() That is an assumption on implementation technique.

Singleton pattern should only be used to guarantee that one and only one instance of a given class exists during run time. People think Singleton is evil because they are using it for globals. It is because of this confusion that Singleton is looked down upon. Please, don't …

Apr 9, 2009 · public sealed class Singleton { Singleton() { } public static Singleton Instance { get { return Nested.instance; } } class Nested { // Explicit static constructor to tell C# compiler // not to mark type as beforefieldinit static Nested() { } internal static readonly Singleton instance = …

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.

May 11, 2015 · /** * The Singleton class defines the `getInstance` method that lets clients access * the unique singleton instance. */ class Singleton { private static instance: Singleton; /** * The Singleton's constructor should always be private to prevent …

I wouldn't exactly consider singleton to be an anti-pattern. However, a singleton is basically a way to use global variables. And global variables are bad because any code anywhere in the system can change their values. So when debugging, it can be challenging to figure out which code path leads to the Singleton's current state.

Jun 10, 2020 · This question is not for the discussion of whether or not the singleton design pattern is desirable, is an anti-pattern, or for any religious wars, but to discuss how this pattern is best implement...

I have been reading a lot about Singletons, when they should and shouldn't be used, and how to implement them safely. I am writing in C++11, and have come across the Meyer's lazy initialized implementation of a singleton, as seen in this question. This implementation is: static Singleton& instance() { static Singleton s; return s; }

Feb 25, 2018 · A Singleton candidate must satisfy three requirements: controls concurrent access to a shared resource. access to the resource will be requested from multiple, disparate parts of the system. there can be only one object. If your proposed Singleton has only one or two of these requirements, a redesign is almost always the correct option.

The singleton pattern limits the number of instances of a particular object to just one. This single instance is called the singleton. defines getInstance() which returns the unique instance. responsible for creating and managing the instance object. The singleton object is implemented as an immediate anonymous function.