Special Singleton (like None)
67586
Defining my own None-like Python constant
77713
Convert variable to type only known at run-time?
85429
What does @synchronized() do as a singleton method in objective C?
62584
What are drawbacks or disadvantages of singleton pattern?
72062
Is it possible to prevent stack allocation of an object and only allow it to be instantiated with 'new'?
66464
Faithful group actions for singleton group or for empty set
131726
How to make primitive type properties Optional?
152312
IOS Weird compiler error: "expected ']' before ;' using set-ter for NSString constant in singleton
140941
Global or Singleton for database connection?
151825
Is there any difference between "foo is None" and "foo == None"?
78399
In $T_1$ space, all singleton sets are closed?
148873
Objective-C: Use singleton vs. use class as an object?
69311
What is a singleton in C#?
73217
Is there a way to instantiate a class without calling __init__?
129207
What is so bad about singletons?
7330
Java - No enclosing instance of type Foo is accessible
56122
Is there any way to define pure functions with optional arguments?