Tracking Boolean State Changes

1#include <iostream>
2using namespace std;
3
4int main() {
5  bool wasAlive{true}; // Previous state
6  bool isAlive{true}; // Current state
7  int Health{100};
8
9  // Store the previous state before updating
10  wasAlive = isAlive;
11
12  // Update current state based on health
13  Health = Health - 150; // Take massive damage
14  isAlive = Health > 0;
15
16  // We can now check if the state just changed
17  bool justDied{wasAlive && !isAlive};
18
19  if (justDied) {
20    cout << "Game Over - you just died!\n";
21  } else if (!wasAlive && !isAlive) {
22    cout << "Still dead\n";
23  } else if (wasAlive && isAlive) {
24    cout << "Still alive\n";
25  }
26}

1#include <iostream>
2using namespace std;
3
4int main() {
5  // Track battle status
6  bool wasInCombat{false};
7  bool isInCombat{false};
8  bool hasWeapon{true};
9
10  // First update
11  wasInCombat = isInCombat;
12  isInCombat = true;
13
14  bool justEnteredCombat{
15    !wasInCombat && isInCombat};
16  if (justEnteredCombat) {
17    cout << "Combat started!\n";
18    if (!hasWeapon) {
19      cout << "Warning: Entered combat without "
20        "a weapon!\n";
21    }
22  }
23
24  // Second update
25  wasInCombat = isInCombat;
26  isInCombat = false;
27
28  bool justLeftCombat{
29    wasInCombat && !isInCombat};
30  if (justLeftCombat) {
31    cout << "Combat ended!";
32  }
33}