The static keyword

Another thing that is important to know before diving into the Singleton pattern is what the static keyword means, as it's something that we will be using the functionality of when building this pattern. When we use the static keyword, there are three main contexts that it'll be used in:

• Inside a function
• Inside a class definition
• In front of a global variable in a program with multiple files

Static keyword inside a function

The first one, being used inside of a function, basically means that once the variable has been initialized, it will stay in the computer's memory until the end of the program, keeping the value that it has through multiple runs of the function. A simple example would be something like this:

#include <string...