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

Jan 28, 2010 · Singleton is a design pattern(not class) where constructor instantiation is allowed only one time. If more ...

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 …

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 …

Jun 10, 2020 · def singleton(cls): instance=cls() cls.__new__ = cls.__call__= lambda cls: instance cls.__init__ = lambda self: None return instance Use it as a decorator on a class that should …

Sep 18, 2008 · Singleton can be nasty when you have to test the code. You're generally stuck with one instance of the class, and can choose between opening up a door in the constructor …

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 …

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 …

Sep 7, 2012 · public sealed class Singleton { private static readonly Lazy<Singleton> lazy = new Lazy<Singleton>(() => new Singleton()); public static Singleton Instance => lazy.Value; private …

Aug 28, 2008 · @singleton class Duck(object): pass if Duck() is Duck(): print("It works!") else: print("It doesn't work!") Notes: You have to use new-style classes (derive from object) for this. …