Separating Declarations

1// Character.h
2class Character {
3public:
4  // Simple getter - fine in header
5  int GetHealth() { return Health; }
6
7  // Simple setter - fine in header
8  void SetName(const std::string& NewName) {
9    Name = NewName;
10  }
11
12  // Simple calculation - fine in header
13  bool IsAlive() { return Health > 0; }
14
15private:
16  int Health{100};
17  std::string Name;
18};

1// Character.h
2class Character {
3public:
4  void TakeDamage(int Damage);
5  void UseHealthPotion(int PotionStrength);
6private:
7  int Health{100};
8};

1// Character.cpp
2#include "Character.h"
3
4// Complex functions often need more headers
5#include <algorithm>
6
7void Character::TakeDamage(int Damage) {
8  // Complex logic belongs in cpp files
9  if (IsInvulnerable()) { return; }
10
11  int ActualDamage =
12    CalculateDamageReduction(Damage);
13  Health = std::max(0, Health - ActualDamage);
14
15  if (Health <= 0) { OnDeath(); }
16}
17
18void Character::UseHealthPotion(
19  int PotionStrength) {
20  // Multi-line functions are better in cpp files
21  if (Health <= 0) { return; }
22
23  Health = std::min(
24    100, Health + PotionStrength);
25  OnHealthChanged();
26}