SlideShare a Scribd company logo
3
4
// 1
Person(const Person& src)
: height(src.height), weight(src.weight) { }
// 2
Person(const Person& src)
{
height = src.height;
weight = src.height;
}
int main()
{
Person p1(183.4, 78.5);
Person p2(p1);
}
5
7
8
9
10
11
Person& operator=(const Person& rhs)
{
if (this == &rhs)
return *this;
height = rhs.height;
weight = rhs.weight;
return *this;
}
int main()
{
Person p1(183.4, 78.5), p2(175.6, 68.3);
p1 = p2;
}
12
14
15
Person p1 Person p2
int roomNum
3
183.4
double height
78.5
double weight
int* room int roomNum
5
175.6
double height
68.3
double weight
int* room
스택(Stack) 메모리 힙(Heap) 메모리
16
Person p1 Person p2
int roomNum
3
183.4
double height
78.5
double weight
int* room int roomNum
5
175.6
double height
68.3
double weight
int* room
스택(Stack) 메모리 힙(Heap) 메모리
주인이 없어진 메모리!
(Orphaned Memory)
17
Person p1 Person p
int roomNum
3
183.4
double height
78.5
double weight
int* room int roomNum
3
183.4
double height
78.5
double weight
int* room
스택(Stack) 메모리 힙(Heap) 메모리
printRoom는 방의 정보를 출력하는 함수
함수가 호출되면서 얕은 복사로 인해
포인터만 복사되고 데이터는 복사되지 않음
18
Person p1
int roomNum
3
183.4
double height
78.5
double weight
int* room
스택(Stack) 메모리 힙(Heap) 메모리
반환 해제된 메모리
→ 댕글링 포인터(Dangling Pointer)
printRoom 함수가 리턴하면
스택 객체인 p의 소멸자가 호출되면서
room 포인터가 가리키는 메모리를 해제함
19
20
class Person {
private:
int* room;
int roomNum;
double height;
double weight;
public:
Person() { }
Person(int _roomNum, double _height, double _weight)
: roomNum(_roomNum), height(_height), weight(_weight) {
room = new int[roomNum];
}
~Person() {
delete[] room;
}
};
21
int main()
{
Person p1(3, 183.4, 78.5);
Person p2(5, 175.6, 68.3);
p1 = p2;
}
22
void printRoom(Person p) { }
int main()
{
Person p1(3, 183.4, 78.5);
printRoom(p1);
}
23
Person(const Person& src)
: roomNum(src.roomNum), height(src.height), weight(src.weight)
{
room = new int[roomNum];
for (int i = 0; i < roomNum; ++i)
room[i] = src.room[i];
}
24
Person& operator=(const Person& rhs) {
if (this == &rhs)
return *this;
delete[] room;
room = nullptr;
height = rhs.height;
weight = rhs.weight;
roomNum = rhs.roomNum;
room = new int[roomNum];
for (int i = 0; i < roomNum; ++i)
room[i] = rhs.room[i];
return *this;
}
25
https://github.com/utilForever/ModernCpp/blob/master/ModernCpp/Classes/ruleOfZero.cpp
https://github.com/utilForever/ModernCpp/blob/master/ModernCpp/Classes/ruleOfFive.cpp
27

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C++ Programming - 7th Study

  • 1.
  • 2.
  • 3. 3
  • 4. 4
  • 5. // 1 Person(const Person& src) : height(src.height), weight(src.weight) { } // 2 Person(const Person& src) { height = src.height; weight = src.height; } int main() { Person p1(183.4, 78.5); Person p2(p1); } 5
  • 6.
  • 7. 7
  • 8. 8
  • 9. 9
  • 10. 10
  • 11. 11
  • 12. Person& operator=(const Person& rhs) { if (this == &rhs) return *this; height = rhs.height; weight = rhs.weight; return *this; } int main() { Person p1(183.4, 78.5), p2(175.6, 68.3); p1 = p2; } 12
  • 13.
  • 14. 14
  • 15. 15
  • 16. Person p1 Person p2 int roomNum 3 183.4 double height 78.5 double weight int* room int roomNum 5 175.6 double height 68.3 double weight int* room 스택(Stack) 메모리 힙(Heap) 메모리 16
  • 17. Person p1 Person p2 int roomNum 3 183.4 double height 78.5 double weight int* room int roomNum 5 175.6 double height 68.3 double weight int* room 스택(Stack) 메모리 힙(Heap) 메모리 주인이 없어진 메모리! (Orphaned Memory) 17
  • 18. Person p1 Person p int roomNum 3 183.4 double height 78.5 double weight int* room int roomNum 3 183.4 double height 78.5 double weight int* room 스택(Stack) 메모리 힙(Heap) 메모리 printRoom는 방의 정보를 출력하는 함수 함수가 호출되면서 얕은 복사로 인해 포인터만 복사되고 데이터는 복사되지 않음 18
  • 19. Person p1 int roomNum 3 183.4 double height 78.5 double weight int* room 스택(Stack) 메모리 힙(Heap) 메모리 반환 해제된 메모리 → 댕글링 포인터(Dangling Pointer) printRoom 함수가 리턴하면 스택 객체인 p의 소멸자가 호출되면서 room 포인터가 가리키는 메모리를 해제함 19
  • 20. 20
  • 21. class Person { private: int* room; int roomNum; double height; double weight; public: Person() { } Person(int _roomNum, double _height, double _weight) : roomNum(_roomNum), height(_height), weight(_weight) { room = new int[roomNum]; } ~Person() { delete[] room; } }; 21
  • 22. int main() { Person p1(3, 183.4, 78.5); Person p2(5, 175.6, 68.3); p1 = p2; } 22
  • 23. void printRoom(Person p) { } int main() { Person p1(3, 183.4, 78.5); printRoom(p1); } 23
  • 24. Person(const Person& src) : roomNum(src.roomNum), height(src.height), weight(src.weight) { room = new int[roomNum]; for (int i = 0; i < roomNum; ++i) room[i] = src.room[i]; } 24
  • 25. Person& operator=(const Person& rhs) { if (this == &rhs) return *this; delete[] room; room = nullptr; height = rhs.height; weight = rhs.weight; roomNum = rhs.roomNum; room = new int[roomNum]; for (int i = 0; i < roomNum; ++i) room[i] = rhs.room[i]; return *this; } 25
  • 26.