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In object-oriented programming, the singleton pattern is software design pattern that restricts the instantiation of a class to a singular instance. It is one of the well-known "Gang of Four" design patterns , which describe how to solve recurring problems in object-oriented software. [ 1 ]
Linear block codes that achieve equality in the Singleton bound are called MDS (maximum distance separable) codes. Examples of such codes include codes that have only codewords (the all-word for , having thus minimum distance ), codes that use the whole of () (minimum distance 1), codes with a single parity symbol (minimum distance 2) and their ...
In software engineering, a software design pattern or design pattern is a general, reusable solution to a commonly occurring problem in many contexts in software design. [1] A design pattern is not a rigid structure that can be transplanted directly into source code. Rather, it is a description or a template for solving a particular type of ...
The book includes examples in C++ and Smalltalk. It has been influential to the field of software engineering and is regarded as an important source for object-oriented design theory and practice. More than 500,000 copies have been sold in English and in 13 other languages. [ 1 ]
For example, the factory interface is commonly implemented as a singleton to provide global access for creating flyweights. Generally speaking, the retrieval algorithm begins with a request for a new object via the factory interface. The request is typically forwarded to an appropriate cache based on what kind of object it is. If the request is ...
Whereas the singleton allows only one instance of a class to be created, the multiton pattern allows for the controlled creation of multiple instances, which it manages through the use of a map. Rather than having a single instance per application (e.g. the java.lang.Runtime object in the Java programming language ) the multiton pattern instead ...
In a software design pattern view, lazy initialization is often used together with a factory method pattern.This combines three ideas: Using a factory method to create instances of a class (factory method pattern)
In the thread-safe C++ example the single instance is allocated with new. I do not see how the destructor would ever be called. Shouldn't the example us an auto_ptr or equivilant? —The preceding JohnCFemiani 15:45, 7 December 2006 (UTC) Done; thanks for catching that. I'm thinking that perhaps we should get rid of the C++ examples altogether.