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Book Overview & Buying
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Table Of Contents
C++ Memory Management
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There are many design patterns out there. Design patterns are a topic of their own, representing well-known ways of solving problems that one can represent in the abstract, give a name to, explain to others, and then reify within the constraints and idioms of one’s chosen programming language.
The singleton design pattern describes ways in which we can write a class that ensures it is instantiated only once in a program.
Singleton is not a well-liked pattern: it makes testing difficult, introduces dependencies on global state, represents a single point of failure in a program as well as a potential program-wide bottleneck, complicates multithreading (if the singleton is mutable, then its state requires synchronization), and so on, but it has its uses, is used in practice, and we use it on occasion in this book.
There are many ways to write a class that is instantiated only once in a program with the C++ language. All of them share some key...