How do you implement the Singleton design pattern?
What irks me most though is the run-time check of the hidden boolean in getInstance() That is an assumption on implementation technique.
What are drawbacks or disadvantages of singleton pattern?
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 …
What is the best way of implementing a singleton in Python?
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 …
.net - What is a singleton in C#? - Stack Overflow
Jan 28, 2010 · Singleton is a design pattern(not class) where constructor instantiation is allowed only one time. If more ...
What are the real world applications of the singleton pattern?
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 …
Simplest/cleanest way to implement a singleton in JavaScript
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. …
On design patterns: When should I use the singleton?
I have a side question: any Singleton implementation can also be implemented using a "static" class (with a "factory"/"init" method) - without actually creating an instance of a class (you …
c# - AddTransient, AddScoped and AddSingleton Services …
Jul 1, 2016 · A Singleton service is created when it is first requested. This same instance is then used by all the subsequent requests. So in general, a Singleton service is created only one …
How is Meyers' implementation of a Singleton actually a Singleton
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 …
Implementing Singleton with an Enum (in Java) - Stack Overflow
Oct 10, 2014 · You access the singleton's methods along these lines: MySingleton.INSTANCE.doSomething(); String something = …