참조자(&)

변수

int main()

{

    int num = 3;                     

    int &ref = num;                    // num의 주소를 ref가 참조(num 과 ref의 변수 주소는 동일)

    int *numAddress = #      // num의 주소를 넘김.

    

/*

cout<<*numAddress<<endl;    // 3 반환.

cout<<numAddress<<endl;     // num의 주소 반환. ex) 0x7ffe13550e84

cout<<&numAddress<<endl;  // numAddress의 주소 반환. ex)0x7ffe13550e88

     */

    cout<<&num<<endl<<&ref<<endl;

    cout<<numAddress<<endl;

    return 0;

}

0x7ffe13550e84                                                                                                                                                                    

0x7ffe13550e84                                                                                                                                                                    

0x7ffe13550e84

함수(&)

#include <iostream>

using namespace std;

class SelfRef

{

private:

    int num;

public:

    SelfRef(int n) : num(n)

    {

        cout<<"객체생성"<<endl;

    }

    SelfRef& Adder(int n)

    {

        num+=n;

        return *this;                // this 객체의 주소가 가리키는 값 반환.

    }

    SelfRef& ShowTwoNumber()

    {

        cout<<num<<endl;

        return *this;

    }

};

int main()

{

    SelfRef obj(3);

    SelfRef &ref=obj.Adder(2);        // this의 주소를 참조 == (ref의주소 == obj객체의 주소) 

    

    obj.ShowTwoNumber();

    ref.ShowTwoNumber();

    

    ref.Adder(1).ShowTwoNumber().Adder(2).ShowTwoNumber();

    return 0;

}

객체생성                                                                                                                                                                          

5                                                                                                                                                                                 

5                                                                                                                                                                                 

6                                                                                                                                                                                 

8 

함수(*)

#include <iostream>

using namespace std;

class SelfRef

{

private:

    int num;

public:

    SelfRef(int n) : num(n)

    {

        cout<<"객체생성"<<endl;

    }

    

    SelfRef *Adder(int n)

    {

        num+=n;

        return this;

    }

    

    SelfRef *ShowTwoNumber()

    {

        cout<<num<<endl;

        return this;

    }

    

};

int main()

{

    SelfRef obj(3);

    SelfRef *ref=obj.Adder(2);

    

    obj.ShowTwoNumber();

    ref->ShowTwoNumber();

    

    ref->Adder(1)->ShowTwoNumber()->Adder(2)->ShowTwoNumber();

    return 0;

    

}

객체생성                                                                                                                                                                          

5                                                                                                                                                                                 

5                                                                                                                                                                                 

6                                                                                                                                                                                 

8