Creational Design Patterns in Modern C++ - CRTP Idiom

The video tutorial explains how to implement the Singleton pattern using the Curiously Recurring Template Pattern (CRTP) in C++. It begins by discussing the challenges of implementing Singleton behavior in multiple classes and introduces CRTP as a solution. The tutorial then provides a step-by-step guide to implementing Singleton using CRTP, including creating a base Singleton class and inheriting it in child classes. It also covers the use of macros to simplify the process and discusses an alternative implementation approach. The video concludes with a brief mention of future topics.

Why is it necessary to make the base Singleton a friend of the child class?

Describe an alternative implementation of the Singleton pattern mentioned in the text.