// todo.cpp: todo list as a class

#include <iostream>
#include <string>
using namespace std;

class ToDo {
public:
   ToDo() : count{0} { }

   ToDo(string first_item) : count{1} {
      items[0] = first_item;
   }

   bool empty() {
      return count <= 0;
   }

   bool full() {
      return count >= MAXITEMS;
   }

   void add(string next_item) {
      if ( full() )
         throw "Adding item to full todo list.";
      items[count] = next_item;
      ++count;
   }

   string next_item() {
      if ( empty() )
         throw "Removing item from empty todo list.";
      string result = items[0];
      for(int i = 0; i < count - 1; ++i)
         items[i] = items[i + 1];
      --count;
      return result;
   }

private:
   static constexpr int MAXITEMS = 100;
   string items[MAXITEMS];
   int count;
};

int main() {
   ToDo today("Eat breakfast."); // can't start a day without eating!
   today.add("Go to class.");
   today.add("Eat lunch.");
   today.add("Show up for office hours.");
   today.add("Go home.");
   cout << "Today's list:" << endl;
   while ( !today.empty() )
      cout << today.next_item() << endl;
   return 0;
}