# this 포인터

## this 포인터 <a href="#this-ed-8f-ac-ec-9d-b8-ed-84-b0" id="this-ed-8f-ac-ec-9d-b8-ed-84-b0"></a>

클래스 내부에서 `this`를 사용하여 자기 자신을 참조하는 포인터이다.

**this포인터를 활용한 예제**

```cpp
#include <iostream>
using namespace std;

class Point {
  int x;
  int y;
public :
  Point(int x = 0, int y = 0) : x(x), y(y) {
    cout << "객체 생성" << endl;
   }

  void add(int x, int y = 0) {
    this->x += x;
    this->y += y;
  }

  void show() {
    cout << "[" << x << "," << y << "]" << endl;
  }
};

int main() {
  Point p1(10, 50);
  Point p2(20);

  p1.add(20, -10);
  p2.add(5, 23);
  p1.show();
  p2.show();
}
```

## 자기 자신 참조자(Self Reference) 반환 <a href="#ec-9e-90-ea-b8-b0-ec-9e-90-ec-8b-a0-ec-b0-b8-ec-a1-b0-ec-9e-90self-reference-eb-b0-98-ed-99-98" id="ec-9e-90-ea-b8-b0-ec-9e-90-ec-8b-a0-ec-b0-b8-ec-a1-b0-ec-9e-90self-reference-eb-b0-98-ed-99-98"></a>

&#x20;this포인터가 가리키는 값을 반환하여 참조자를 반환할 수 있다.

```cpp
#include <iostream>
using namespace std;

class Point {
  int x;
  int y;
public :
  Point(int x = 0, int y = 0) : x(x), y(y) { 
    cout << "객체 생성" << endl;
  }

  Point& add(int x, int y = 0) {
    this->x += x;
    this->y += y;
    return *this;
  }

  Point& show() {
    cout << "[" << x << "," << y << "]" << endl;
    return *this;
  }
};

int main() {
  Point p1(10, 50);
  Point& p2 = p1.add(10, -10);

  p1.show();
  p2.show();

  p1.add(15, 15).show().add(-3, -17).show();
  p2.show();
}
```

&#x20;반환형이 `Point&`이고 이렇게 `return *this;`로 반환하면 참조자 정보를 반환한다.


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