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. net - What is a singleton in C#? - Stack Overflow 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 development There is a C# implementation "Implementing the Singleton Pattern in C#" covering most of what you need to know - including some good advice regarding thread safety To be honest, It's very rare that you
What are drawbacks or disadvantages of singleton pattern? 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
How do you implement the Singleton design pattern? 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 environment I prefer, when the Singleton pattern is the best pattern to use, to create the instance as a static member of the class
What are the real world applications of the singleton pattern? Simple What does a singleton do? It provides global access to an instance of an object, and It guarantees that no more than one instance of that type can ever be created So you use a singleton when you need both of these things And that is rare Globals are generally speaking, bad We tend to avoid them when possible And building your application around the assumption that "if more than
What is the best way of implementing a singleton in Python? A singleton is special because its instance is created only once, and a metaclass is the way you customize the creation of a class, allowing it to behave differently than a normal class
Why is Singleton considered an anti-pattern? - Stack Overflow 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 (limiting the number of instances of that object, managing instantiation, etc ) Why exactly is Singleton considered an anti-pattern?
Dagger 2 - what is the purpose of a @Singleton annotation class From the dagger 2 Documentation I noticed that you can have a @Singleton annotated class What is the purpose of marking a class as @Singleton as I have tried to do this in my code but a singleton
On design patterns: When should I use the singleton? 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