#include <iostream>
#include <cstdlib>
#include <list>
using namespace std;

int main()
{
	list<int> li {0, 10, 20, 30, 40};  //born holding 5 ints

	//Simplest way to loop through a list:

	for (auto i: li) {
		cout << i << "\n";
	}
	cout << "\n";

	//We can loop through a list using an iterator like we loop through an
	//array using a pointer.
	//The iterator can be dereferenced with *, and incremented with ++.

	for (auto it {begin(li)}; it != end(li); ++it) {
		cout << *it << "\n";
	}
	cout << "\n";

	//Loop through an array using a pointer.  p is an  int *p;

	int a[] {50, 60, 70, 80, 90};
	for (auto p {begin(a)}; p != end(a); ++p) {
		cout << *p << "\n";
	}
	cout << "\n";

	/*
	//Doesn't work: we can't increment an iterator that points to an element
	//that has been erased.

	for (auto it {begin(li)}; it != end(li); ++it) {
		if (*it == 20) {
			li.erase(it);
		}
	}
	*/

	//One way to make it work:

	for (auto it {begin(li)}; it != end(li);) {
		const bool deservesToDie {*it == 20};
		++it;
		if (deservesToDie) {
			li.remove(20);   //Remove every 20
		}
	}

	//Make sure the 20 was removed.

	for (auto i: li) {
		cout << i << "\n";
	}

	return EXIT_SUCCESS;
}