객체 배열

객체 배열

객체 배열 및 객체 포인터 배열은 구조체 배열과 구조체 포인터 배열과 비슷하다.

SoSimple arr[10]; 형태로 선언
동적할당 할 경우SoSimple * ptrArr = new SoSimple[10]; 형태로 선언

#include <iostream>
#include <cstring>
using namespace std;
#pragma warning(disable:4996)

class Person
{
private:
	char* name;
	int age;
public:
	Person(char* myname, int myage) {
		int len = strlen(myname) + 1;
		name = new char[len];
		strcpy(name, myname);
		age = myage;
	}
	Person()
	{
		name = NULL;
		age = 0;
		cout << "called Person()" << endl;
	}
	void SetPersonInfo(char* myname, int myage)
	{
		name = myname;
		age = myage;
	}
	void ShowPersonInfo() const
	{
		cout << "이름: " << name << ", ";
		cout << "나이: " << age << endl;
	}
	~Person()
	{
		delete[] name;
		cout << "called destructor" << endl;
	}
};

int main()
{
	Person parr[3]; // 객체 배열 선언
	char namestr[100];
	char* strptr;
	int age;
	int len;

	for (int i = 0; i < 3; i++)
	{
		cout << "이름: ";
		cin >> namestr;
		cout << "나이: ";
		cin >> age;
		len = strlen(namestr) + 1;
		strptr = new char[len]; // name이 들어갈 동적메모리 할당
		strcpy(strptr, namestr);
		parr[i].SetPersonInfo(strptr, age); // parr[0] ~ parr[2]까지 접근
	}
	for (int i = 0; i < 3; i++)
	{
		parr[i].ShowPersonInfo();
	}

	return 0;
}

객체 포인터 배열

포인터일땐 '->' 사용해서 접근해야한다

#include <iostream>
#include <cstring>
using namespace std;
#pragma warning(disable:4996)

class Person
{
private:
	char* name;
	int age;
public:
	Person(char* myname, int myage) {
		int len = strlen(myname) + 1;
		name = new char[len];
		strcpy(name, myname);
		age = myage;
	}
	Person()
	{
		name = NULL;
		age = 0;
		cout << "called Person()" << endl;
	}
	void SetPersonInfo(char* myname, int myage)
	{
		name = myname;
		age = myage;
	}
	void ShowPersonInfo() const
	{
		cout << "이름: " << name << ", ";
		cout << "나이: " << age << endl;
	}
	~Person()
	{
		delete[] name;
		cout << "called destructor" << endl;
	}
};

int main()
{
	Person* parr[3]; // 객체 포인터 배열 선언
	char namestr[100];
	int age;

	for (int i = 0;i < 3;i++)
	{
		cout << "이름: ";
		cin >> namestr;
		cout << "나이: ";
		cin >> age;
		parr[i] = new Person(namestr, age);
	}

	parr[0]->ShowPersonInfo();
	parr[1]->ShowPersonInfo();
	parr[2]->ShowPersonInfo();
	delete parr[0];
	delete parr[1];
	delete parr[2];

	return 0;
}

This Pointer

#include <iostream>
using namespace std;

class TwoNumber
{
private:
	// 멤버변수
	int num1;
	int num2;
public:
	TwoNumber(int num1, int num2) // 매개변수
	{
		this->num1 = num1; // num1(멤버변수) = num1(매개변수)
		this->num2 = num2;
	}
	void ShowTwoNumber()
	{
		cout << this->num1 << endl; // this -> num1 : 멤버변수
		cout << this->num2 << endl;
	}
};

int main()
{
	TwoNumber two(2, 4);
	two.ShowTwoNumber();
	return 0;
}

Self-Reference의 반환

#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;
}