//********************************************************
// The following code example is taken from the book
//  C++23 - The Complete Guide
//  by Nicolai M. Josuttis (www.josuttis.com)
//  https://www.cppstd23.com
//
// The code is licensed under a
//  Creative Commons Attribution 4.0 International License
//  https://creativecommons.org/licenses/by/4.0/
//********************************************************


#include <iostream>
#include <ranges>
#include "fibo3.hpp"

int main()
{
  // initialize two different coroutines for Fibonacci numbers:
  auto fibo5 = fibonacci(5);                          // first 5 Fibonacci numbers
  auto fibo10 = fibonacci(10) | std::views::drop(3);  // 4th to 10th Fibonacci number

  // start both coroutines:
  auto pos5 = fibo5.begin();      // RESUME first coroutine
  auto pos10 = fibo10.begin();    // RESUME second coroutine three times

  // iterate over the values of both generators as long as there is a value: 
  while (pos5 != fibo5.end() || pos10 != fibo10.end()) {
    if (pos5 != fibo5.end()) {
      std::cout << "fibo5: " << *pos5 << "  ";
      ++pos5;                     // RESUME first coroutine
    }
    if (pos10 != fibo10.end()) {
      std::cout << "fibo10: " << *pos10;
      ++pos10;                    // RESUME second coroutine
    }
    std::cout << '\n';
  }
}