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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 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 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 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
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
c++ - Singleton: How should it be used - Stack Overflow So a singleton should be used if and only if, we need both the traits it offers: If we need global access (which is rare, because globals are generally discouraged) and we need to prevent anyone from ever creating more than one instance of a class (which sounds to me like a design issue)
Thread Safe C# Singleton Pattern - Stack Overflow The pattern you see here is called double-checked locking Its purpose is to avoid the expensive lock operation which is only going to be needed once (when the singleton is first accessed) The implementation is such because it also has to ensure that when the singleton is initialized there will be no bugs resulting from thread race conditions