![]() Facade objects are also often singletons because only one facade object is required. The singleton pattern can also be used as a basis for other design patterns, such as the abstract factory, factory method, builder and prototype patterns. Additionally, they permit lazy allocation and initialization, whereas global variables in many languages will always consume resources. Singletons are often preferred to global variables because they do not pollute the global namespace (or their containing namespace). The term comes from the mathematical concept of a singleton. Control their instantiation (for example, hiding the constructors of a class). ![]() More specifically, the singleton pattern allows objects to: One of the well-known "Gang of Four" design patterns, which describe how to solve recurring problems in object-oriented software, the pattern is useful when exactly one object is needed to coordinate actions across a system. In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. Design pattern in object-oriented software development A class diagram exemplifying the singleton pattern.
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