C++17 STL Cookbook

How to do it...

In this section, we concentrate on implementing an iterator that generates numbers from the Fibonacci number sequence while iterating over it.

1. In order to be able to print the Fibonacci numbers to the terminal, we need to include a header first:

      #include <iostream>

2. We call the Fibonacci iterator, fibit. It will carry a member i, which saves the index position in the Fibonacci sequence, and a and b will be the variables that hold the last two Fibonacci values. If instantiated with the default constructor, a Fibonacci iterator will be initialized to the value F(0):

      class fibit      {          size_t i {0};          size_t a {0};          size_t b {1};

3. Next, we define the standard constructor and another constructor, which allows us to initialize the ...