Creational Design Patterns in Modern C++ - Introduction - intent of patterns and their basic implementation.

The video tutorial explains the Singleton design pattern, a commonly used but sometimes controversial pattern. It is used to ensure a class has only one instance, providing a global point of access. The tutorial discusses use cases like managing resources such as print spoolers or database connections, where multiple instances could lead to state corruption. The Singleton pattern makes the class responsible for creating its own instance, intercepting client calls to ensure only one instance is returned. The video also covers the structure and notation of the pattern, using OMT notation to describe class attributes and methods.

Why is it important for certain classes to have only one instance in the Singleton pattern?

• To save memory space

• To prevent state corruption of shared resources

• To enable faster processing

• To allow multiple configurations

What is the main intent of the Singleton design pattern?

• To make classes behave like local variables

• To improve the speed of object creation

• To ensure a class has only one instance and provide a global access point

• To allow multiple instances of a class

Why is the Singleton pattern sometimes criticized?

• It is too complex to implement

• It behaves like a global variable

• It requires too much memory

• It is not compatible with modern programming languages

In the Singleton pattern, who is responsible for creating the instance of the class?

• The operating system

• The client

• The class itself

• A separate factory class

What does the Singleton pattern disable to ensure only one instance is created?

• Direct construction of the object

• Use of global variables

• Inheritance from other classes

• Access to class methods