Singleton Pattern

The Singleton pattern §

C++ Project Example §

Link: Chocolate Factory

The Singleton pattern ensures a class has only one instance, and provides a global point of access to it.

The most common reason for implementing Singleton is to control access to a shared resource - for example, a database or a file.

Points to remember §

• Use the Singleton pattern when a class in your program should have just a single instance available to all clients; for example, a single database object shared by different parts of the program
• Use the Singleton pattern when you need stricter control over global variables
• Make sure your Singleton implementation is thread safe

classDiagram
direction LR
class Singleton {
    +static instance
    +other_data_members
    +static getInstance()
    +other_methods()
}

class Client

Client --> Singleton