Another piece of trivia is that if you've ever played with Yahoo's YUI library, some of its features may appear quite familiar and the reason for this is that the Module pattern was a strong influence for YUI when creating their components. Disadvantages Consequently, some of the issues with these patterns actually stem from their main benefits.
When the sole instance should be extensible by subclassing, and clients should be able to use an extended instance without modifying their code. Make interfaces precisely and strongly typed Reason Types are the simplest and best documentation, have well-defined meaning, and are guaranteed to be checked at compile time.
Do not pass an array as a single pointer Reason pointer, size -style interfaces are error-prone. For a String, these fields are all final fields. The general rule is that we want variables to be as narrowly scoped as possible while still getting the job done.
This style unfortunately leads to uninitialized variables. This can make them hard to distinguish from ordinary code, hard to update, hard to manipulate by tools, and may have the wrong semantics. In particular, this means: Links to just a few of these can be found below. This makes a class independent of how its objects are created which concrete classes are instantiated.
If the socket needed additional configuration i. But when we do that, we inadvertently acquire a strange little restriction.
Does that sound okay. Also, precisely typed code is often optimized better. Simple Report all non-const variables declared at namespace scope. This test is now slow.
Lazy initialization takes control away from you In the desktop PC world of virtual memory and soft performance requirements, lazy initialization is a smart trick.
I found this here on the IBM site. It explains the usage of a Logger Singleton class quite well. A classic example of a true singleton is a logging service.
Join Stack Overflow to learn, share knowledge, and build your career. Singleton Pattern & its implementation with C++ There are lots of different ways to implement the Singleton Pattern. But by using a private constructor and a static method to create and return an instance of the class is a popular way for implementing Singleton Pattern.Writing a singleton class in c++